Frontier Funds 10-Q 16 Aug 21 2021 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 16, 2021
Document Information Line Items
Entity Registrant Name	FRONTIER FUNDS
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		0
Amendment Flag	false
Entity Central Index Key	0001261379
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	000-51274
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-6815533
Entity Address, Address Line One	25568 Genesee Trail Road
Entity Address, City or Town	Golden
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80401
City Area Code	(303)
Local Phone Number	454-5500
Entity Interactive Data Current	Yes

Statements of Financial Conditi

Statements of Financial Condition - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Frontier Funds [Member]
ASSETS
Cash and cash equivalents	$ 112,909	$ 468,466
U.S. Treasury securities, at fair value	1,490,213	2,282,606
Open trade equity, at fair value		100,440
Receivable from futures commission merchants	296,169	233,973
Investments in private investment companies, at fair value	22,345,555	23,089,312
Interest receivable	30,776	45,578
Receivable from related parties		26,129
Redemptions receivable from private investment companies		181,323
Total Assets	24,275,622	26,427,827
LIABILITIES
Redemptions payable	17,221	38,128
Open trade deficit, at fair value	71,432
Management fees payable to Managing Owner	1,511	8,854
Incentive fees payable to Managing Owner	2,481	2,107
Service fees payable to Managing Owner	35,026	36,705
Trading fees payable to Managing Owner	80,804	81,698
Risk analysis fees payable	10,905	9,513
Payables to related parties		26,129
Subscriptions in advance for service fee rebates	656,619	638,962
Other liabilities	17,395	16,592
Total Liabilities	893,394	858,688
CAPITAL
Managing Owner Units	241,505	283,217
Limited Owner Units	23,140,723	25,285,922
Total Owners’ Capital	23,382,228	25,569,139
Total Capital	23,382,228	25,569,139
Total Liabilities and Capital	24,275,622	26,427,827
Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
ASSETS
Cash and cash equivalents	14,129	87,715
U.S. Treasury securities, at fair value	186,482	427,393
Investments in private investment companies, at fair value	3,222,991	3,644,603
Investments in unconsolidated trading companies, at fair value	16,682	16,669
Interest receivable	3,851	8,534
Receivable from related parties		4,892
Redemptions receivable from private investment companies		31,886
Total Assets	3,444,135	4,221,692
LIABILITIES
Redemptions payable
Interest payable to Managing Owner
Service fees payable to Managing Owner	158	385
Trading fees payable to Managing Owner	10,587	12,576
Subscriptions in advance for service fee rebates	22,650	22,650
Other liabilities	1,973	3,110
Total Liabilities	35,368	38,721
CAPITAL
Non-Controlling Interests
Total Capital	3,408,767	4,182,971
Total Liabilities and Capital	3,444,135	4,221,692
Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
ASSETS
Cash and cash equivalents	4,951	4,771
U.S. Treasury securities, at fair value	65,347	23,245
Investments in private investment companies, at fair value	767,148	1,014,591
Investments in unconsolidated trading companies, at fair value	5,846	907
Interest receivable	1,350	464
Receivable from related parties		266
Redemptions receivable from private investment companies		24,837
Total Assets	844,642	1,069,081
LIABILITIES
Redemptions payable		38,128
Interest payable to Managing Owner
Service fees payable to Managing Owner	47	70
Trading fees payable to Managing Owner	4,440	5,460
Subscriptions in advance for service fee rebates	31,725	31,725
Other liabilities	692	171
Total Liabilities	36,904	75,554
CAPITAL
Non-Controlling Interests
Total Capital	807,738	993,527
Total Liabilities and Capital	844,642	1,069,081
Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
ASSETS
Cash and cash equivalents	8,750	93,327
U.S. Treasury securities, at fair value	115,492	454,738
Investments in private investment companies, at fair value	1,280,647	738,053
Investments in unconsolidated trading companies, at fair value	10,331	17,736
Interest receivable	2,385	9,080
Receivable from related parties		5,205
Redemptions receivable from private investment companies		1,251
Total Assets	1,417,605	1,319,390
LIABILITIES
Redemptions payable
Interest payable to Managing Owner	37	87
Service fees payable to Managing Owner	20	18
Trading fees payable to Managing Owner	3,492	2,281
Subscriptions in advance for service fee rebates	392	393
Other liabilities	1,221	3,308
Total Liabilities	5,162	6,087
CAPITAL
Non-Controlling Interests
Total Capital	1,412,443	1,313,303
Total Liabilities and Capital	1,417,605	1,319,390
Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
ASSETS
Cash and cash equivalents	66,646	261,803
U.S. Treasury securities, at fair value	879,612	1,275,641
Open trade equity, at fair value		100,440
Receivable from futures commission merchants	296,169	233,973
Investments in private investment companies, at fair value	9,976,440	10,528,252
Investments in unconsolidated trading companies, at fair value	78,686	49,755
Interest receivable	18,165	25,471
Receivable from related parties		14,602
Redemptions receivable from private investment companies		55,473
Total Assets	11,315,718	12,545,410
LIABILITIES
Open trade deficit, at fair value	71,432
Management fees payable to Managing Owner	1,511	8,854
Interest payable to Managing Owner	1,870	1,376
Service fees payable to Managing Owner	19,481	21,381
Trading fees payable to Managing Owner	36,556	37,894
Risk analysis fees payable	10,905	9,513
Payables to related parties
Subscriptions in advance for service fee rebates	358,273	346,855
Other liabilities	10,931	9,258
Total Liabilities	510,959	435,131
CAPITAL
Non-Controlling Interests
Total Capital	10,804,759	12,110,279
Total Liabilities and Capital	11,315,718	12,545,410
Frontier Select Fund [Member] | The Series of Frontier Funds [Member]
ASSETS
Cash and cash equivalents	2,772
U.S. Treasury securities, at fair value	36,588
Open trade equity, at fair value
Receivable from futures commission merchants
Investments in private investment companies, at fair value	1,607,108	1,638,665
Investments in unconsolidated trading companies, at fair value	3,273
Interest receivable	756
Receivable from related parties
Redemptions receivable from private investment companies		67,876
Total Assets	1,650,497	1,706,541
LIABILITIES
Open trade deficit, at fair value
Management fees payable to Managing Owner
Interest payable to Managing Owner	107	179
Service fees payable to Managing Owner	3,707	3,709
Trading fees payable to Managing Owner	4,110	3,933
Risk analysis fees payable
Payables to related parties		26,129
Subscriptions in advance for service fee rebates	20,378	19,463
Other liabilities	388
Total Liabilities	28,690	53,413
CAPITAL
Non-Controlling Interests
Total Capital	1,621,807	1,653,128
Total Liabilities and Capital	1,650,497	1,706,541
Frontier Global Fund [Member] | The Series of Frontier Funds [Member]
ASSETS
Cash and cash equivalents	7,120	5,694
U.S. Treasury securities, at fair value	93,971	27,742
Investments in private investment companies, at fair value	2,846,614	3,068,656
Investments in unconsolidated trading companies, at fair value	8,406	1,083
Interest receivable	1,941	554
Receivable from related parties		319
Total Assets	2,958,052	3,104,048
LIABILITIES
Redemptions payable
Interest payable to Managing Owner	232	326
Service fees payable to Managing Owner	6,307	6,348
Trading fees payable to Managing Owner	12,632	11,849
Subscriptions in advance for service fee rebates	156,772	154,671
Other liabilities	996	205
Total Liabilities	176,939	173,399
CAPITAL
Non-Controlling Interests
Total Capital	2,781,113	2,930,649
Total Liabilities and Capital	2,958,052	3,104,048
Frontier Heritage Fund [Member] | The Series of Frontier Funds [Member]
ASSETS
Cash and cash equivalents	8,541	15,156
U.S. Treasury securities, at fair value	112,721	73,847
Investments in private investment companies, at fair value	2,511,300	2,367,462
Investments in unconsolidated trading companies, at fair value	10,083	2,880
Interest receivable	2,328	1,475
Receivable from related parties		845
Total Assets	2,644,973	2,461,665
LIABILITIES
Redemptions payable	17,221
Interest payable to Managing Owner	235	139
Service fees payable to Managing Owner	5,306	4,794
Trading fees payable to Managing Owner	8,987	7,705
Subscriptions in advance for service fee rebates	66,429	63,205
Other liabilities	1,194	540
Total Liabilities	99,372	76,383
CAPITAL
Non-Controlling Interests
Total Capital	2,545,601	2,385,282
Total Liabilities and Capital	2,644,973	2,461,665
Class 2 [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	2,384	2,212
Limited Owner Units	$ 428,426	$ 464,012
Units Outstanding
Units Outstanding (in Shares)	4,492	5,241
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 95.90	$ 88.95
Class 2 [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 2,943	$ 6,265
Limited Owner Units	$ 220,435	$ 257,673
Units Outstanding
Units Outstanding (in Shares)	3,038	3,908
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 73.52	$ 67.54
Class 2 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 4,511	$ 3,939
Limited Owner Units	$ 34,265	$ 30,334
Units Outstanding
Units Outstanding (in Shares)	394	399
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 98.49	$ 85.99
Class 2 [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 56,491	$ 51,810
Limited Owner Units	$ 1,644,977	$ 1,906,359
Units Outstanding
Units Outstanding (in Shares)	11,954	15,000
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 142.34	$ 130.54
Class 2 [Member] | Frontier Select Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 17,737	$ 17,210
Limited Owner Units	$ 57,694	$ 50,769
Units Outstanding
Units Outstanding (in Shares)	698	722
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 108.07	$ 94.20
Class 2 [Member] | Frontier Global Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 31,522	$ 31,366
Limited Owner Units	168,853	157,311
Total Owners’ Capital	$ 2,781,113	$ 2,930,649
Units Outstanding
Units Outstanding (in Shares)	1,114	1,126
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 179.85	$ 167.56
Class 2 [Member] | Frontier Heritage Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 27,818	$ 24,105
Limited Owner Units	211,840	183,565
Total Owners’ Capital	$ 2,545,601	$ 2,385,282
Units Outstanding
Units Outstanding (in Shares)	1,332	1,332
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 179.93	$ 155.92
Class 2a [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 2a [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 2a [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 9,537	$ 8,274
Limited Owner Units	$ 82,724	$ 76,583
Units Outstanding
Units Outstanding (in Shares)	1,447	1,535
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 63.74	$ 55.29
Class 2a [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 57,486	$ 75,416
Limited Owner Units	$ 25,378	$ 30,961
Units Outstanding
Units Outstanding (in Shares)	671	940
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 123.47	$ 113.20
Class 2a [Member] | Frontier Select Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 3 [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 25,750	$ 54,405
Limited Owner Units	$ 2,912,036	$ 3,508,082
Units Outstanding
Units Outstanding (in Shares)	32,661	42,754
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 89.95	$ 83.33
Class 3 [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 4,117	$ 7,167
Limited Owner Units	$ 580,243	$ 712,682
Units Outstanding
Units Outstanding (in Shares)	8,441	11,333
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 69.23	$ 63.52
Class 3 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units
Limited Owner Units	$ 1,050,928	$ 976,771
Units Outstanding
Units Outstanding (in Shares)	10,172	10,828
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 103.32	$ 90.21
Class 3a [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Total Owners’ Capital	$ 3,408,767	$ 4,182,971
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 3a [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Total Owners’ Capital	$ 807,738	$ 993,527
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Managing Owner Units	$ 1,209	$ 1,048
Limited Owner Units	229,269	216,354
Total Owners’ Capital	$ 1,412,443	$ 1,313,303
Units Outstanding
Units Outstanding (in Shares)	3,422	3,725
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 67.36	$ 58.37
Class 3a [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 517,629	$ 507,148
Total Owners’ Capital	$ 10,804,759	$ 12,110,279
Units Outstanding
Units Outstanding (in Shares)	4,207	4,495
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 123.05	$ 112.81
Class 3a [Member] | Frontier Select Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units
Total Owners’ Capital	$ 1,621,807	$ 1,653,128
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 1 [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 40,171	$ 154,260
Units Outstanding
Units Outstanding (in Shares)	517	2,122
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 77.68	$ 72.68
Class 1 [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units		$ 9,740
Units Outstanding
Units Outstanding (in Shares)		177
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)		$ 55.18
Class 1 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 1 [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 8,386,018	$ 9,430,532
Units Outstanding
Units Outstanding (in Shares)	97,671	117,991
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 85.86	$ 79.93
Class 1 [Member] | Frontier Select Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 1,535,828	$ 1,575,328
Units Outstanding
Units Outstanding (in Shares)	23,209	26,906
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 66.17	$ 58.55
Class 1 [Member] | Frontier Global Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 2,580,738	$ 2,741,972
Units Outstanding
Units Outstanding (in Shares)	22,006	24,725
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 117.28	$ 110.90
Class 1 [Member] | Frontier Heritage Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 2,297,366	$ 2,169,152
Units Outstanding
Units Outstanding (in Shares)	21,026	22,572
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 109.26	$ 96.10
Class 1AP [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 116,780	$ 108,053
Units Outstanding
Units Outstanding (in Shares)	1,106	1,116
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 105.55	$ 96.81
Class 1AP [Member] | Frontier Select Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 10,548	$ 9,821
Units Outstanding
Units Outstanding (in Shares)	130	138
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 81.44	$ 70.99
Class 1AP [Member] | Frontier Global Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units
Units Outstanding
Units Outstanding (in Shares)
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)
Class 1AP [Member] | Frontier Heritage Fund [Member] | The Series of Frontier Funds [Member]
CAPITAL
Limited Owner Units	$ 8,577	$ 8,460
Units Outstanding
Units Outstanding (in Shares)	64	73
Net Asset Value per Unit
Net Asset Value per Unit (in Dollars per share)	$ 134.45	$ 116.50

Statements of Operations

Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Frontier Funds [Member]
Investment income:
Interest - net	$ 2,196	$ 1,798	$ 5,917	$ 9,780
Total Income/(loss)	2,196	1,798	5,917	9,780
Expenses:
Incentive Fees			49,840
Management Fees	4,595	4,704	9,214	9,724
Service Fees - Class 1	116,436	152,889	232,549	355,224
Risk analysis Fees	1,378	1,411	2,764	2,917
Due Diligence Fees	1,462	2,711	3,045	6,843
Trading Fees	241,168	328,254	484,333	772,150
Total Expenses	365,039	490,007	781,745	1,146,896
Investment (loss) - net	(362,843)	(488,209)	(775,828)	(1,137,116)
Other Fees		38		38
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options	109,163	(221,676)	480,722	420,559
Net unrealized gain/(loss) on private investment companies	958,673	937,067	1,935,177	1,729,759
Net realized gain/(loss) on private investment companies	433,719	(3,755,156)	683,641	(3,974,277)
Net change in open trade equity/(deficit)	(122,628)	(51,316)	(169,963)	(77,035)
Net realized gain/(loss) on swap contracts		(189,734)		(189,734)
Net unrealized gain/(loss) on swap contracts		249,461		(7,241,457)
Net realized gain/(loss) on U.S. Treasury securities	(1,051)	5,764	(10,320)	45,731
Net unrealized gain/(loss) on U.S. Treasury securities	(8,333)	(7,730)	(10,500)	4,581
Trading commissions	(348)	(3,683)	(6,365)	(12,058)
Net gain/(loss) on investments	1,369,195	(3,037,003)	2,902,392	(9,293,931)
NET INCREASE/(DECREASE) IN OWNERS’ CAPITAL RESULTING FROM OPERATIONS	1,006,352	(3,525,212)	2,126,564	(10,431,047)
Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net			1,832	1,478
Total Income/(loss)			1,832	1,478
Expenses:
Service Fees - Class 1			357	1,094
Due Diligence Fees			549	1,203
Trading Fees			28,168	61,645
Total Expenses			29,074	63,942
Investment (loss) - net			(27,242)	(62,464)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies			82,310	507,695
Net realized gain/(loss) on private investment companies			14,192	(711,307)
Net realized gain/(loss) on U.S. Treasury securities			(1,239)	6,361
Net unrealized gain/(loss) on U.S. Treasury securities			(630)	(2,598)
Change in fair value of investments in unconsolidated trading companies			11,801	(6,038)
Net gain/(loss) on investments			106,434	(205,887)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS			79,192	(268,351)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS			$ 79,192	$ (268,351)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)			$ (55.18)	$ (10.36)
Class 2 (in Dollars per share)			5.98	(12.05)
Class 3 (in Dollars per share)			$ 5.71	$ (11.22)
Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net			$ 2,303	$ 1,119
Total Income/(loss)			2,303	1,119
Expenses:
Service Fees - Class 1			112	222
Due Diligence Fees			187	185
Trading Fees			18,815	17,312
Total Expenses			19,114	17,719
Investment (loss) - net			(16,811)	(16,600)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies			175,088	177,059
Net realized gain/(loss) on private investment companies			23,096	(349,843)
Net unrealized gain/(loss) on swap contracts				219,997
Net realized gain/(loss) on U.S. Treasury securities			(2,344)	7,218
Net unrealized gain/(loss) on U.S. Treasury securities			(643)	(1,501)
Change in fair value of investments in unconsolidated trading companies			12,908	(8,793)
Net gain/(loss) on investments			208,105	44,137
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS			191,294	27,537
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS			$ 191,294	$ 27,537
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)				$ 0.38
Class 2 (in Dollars per share)			$ 12.50	1.67
Class 2a (in Dollars per share)			8.45	0.94
Class 3 (in Dollars per share)			13.11	1.71
Class 3a (in Dollars per share)			$ 8.99	$ 1.07
Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net			$ 158	$ 6,320
Total Income/(loss)			158	6,320
Expenses:
Incentive Fees			49,840
Management Fees			9,214	9,724
Service Fees - Class 1			132,996	210,982
Risk analysis Fees			2,764	2,917
Trading Fees			223,989	337,493
Total Expenses			418,803	561,154
Investment (loss) - net			(418,645)	(554,834)
Other Fees				38
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options			480,722	420,559
Net unrealized gain/(loss) on private investment companies			754,501	636,269
Net realized gain/(loss) on private investment companies			249,166	(1,805,553)
Net change in open trade equity/(deficit)			(169,963)	(77,035)
Net unrealized gain/(loss) on swap contracts				(5,635,109)
Net realized gain/(loss) on U.S. Treasury securities			(630)	26,115
Net unrealized gain/(loss) on U.S. Treasury securities			(5,303)	(5,025)
Trading commissions			(6,365)	(12,058)
Change in fair value of investments in unconsolidated trading companies			(22,317)	(30,553)
Net gain/(loss) on investments			1,279,811	(6,482,390)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS			861,166	(7,037,224)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS			$ 861,166	$ (7,037,224)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)			$ 5.93	$ (38.64)
Class 1AP (in Dollars per share)			8.74	(44.05)
Class 2 (in Dollars per share)			11.80	(59.38)
Class 2a (in Dollars per share)			10.27	(51.43)
Class 3a (in Dollars per share)			$ 10.24	$ (51.26)
Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
Expenses:
Service Fees - Class 1			$ 23,242	$ 38,092
Trading Fees			23,365	32,400
Total Expenses			46,607	70,492
Investment (loss) - net			(46,607)	(70,492)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies			101,623	143,350
Net realized gain/(loss) on private investment companies			142,733	(282,634)
Net realized gain/(loss) on swap contracts				(91,989)
Net realized gain/(loss) on U.S. Treasury securities			(1,342)	3,748
Net unrealized gain/(loss) on U.S. Treasury securities			(322)	(2,955)
Change in fair value of investments in unconsolidated trading companies			8,689	88,449
Net gain/(loss) on investments			251,381	(142,031)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS			204,774	(212,523)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS			$ 204,774	$ (212,523)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)			$ 7.62	$ (5.52)
Class 1AP (in Dollars per share)			10.45	(5.61)
Class 2 (in Dollars per share)			$ 13.87	$ (7.19)
Frontier Global Fund [Member] | The Series of the Frontier Funds [Member]
Expenses:
Service Fees - Class 1			$ 40,390	$ 58,227
Trading Fees			72,350	107,673
Total Expenses			112,740	165,900
Investment (loss) - net			(112,740)	(165,900)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies			143,997	(504,048)
Net realized gain/(loss) on private investment companies			123,999	417,626
Net realized gain/(loss) on U.S. Treasury securities			(1,879)	12,532
Net unrealized gain/(loss) on U.S. Treasury securities			(953)	(3,714)
Change in fair value of investments in unconsolidated trading companies			15,163	(9,272)
Net gain/(loss) on investments			280,327	(86,876)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS			167,587	(252,776)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS			$ 167,587	$ (252,776)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)			$ 6.38	$ (9.84)
Class 1AP (in Dollars per share)				(9.08)
Class 2 (in Dollars per share)			$ 12.29	$ (11.73)
Frontier Heritage Fund [Member] | The Series of the Frontier Funds [Member]
Expenses:
Service Fees - Class 1			$ 33,902	$ 35,957
Trading Fees			49,672	57,942
Total Expenses			83,574	93,899
Investment (loss) - net			(83,574)	(93,899)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies			340,148	75,226
Net realized gain/(loss) on private investment companies			54,282	(1,135)
Net realized gain/(loss) on swap contracts				(97,745)
Net unrealized gain/(loss) on swap contracts				197,829
Net realized gain/(loss) on U.S. Treasury securities			(1,568)	9,787
Net unrealized gain/(loss) on U.S. Treasury securities			(983)	(6,967)
Change in fair value of investments in unconsolidated trading companies			13,018	(6,144)
Net gain/(loss) on investments			404,897	170,851
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS			321,323	76,952
Less: Operations attributable to non-controlling interests				(95,914)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS			$ 321,323	$ (18,962)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)			$ 13.16	$ (1.03)
Class 1AP (in Dollars per share)			17.95	1.10
Class 2 (in Dollars per share)			$ 24.01	$ 0.65
Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net	37	829
Total Income/(loss)	37	829
Expenses:
Service Fees - Class 1	501	2,943
Due Diligence Fees	1,107	2,072
Trading Fees	33,037	57,135
Total Expenses	34,645	62,150
Investment (loss) - net	(34,608)	(61,321)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	119,013	654,040
Net realized gain/(loss) on private investment companies	102,200	(1,094,200)
Net unrealized gain/(loss) on swap contracts		87,524
Net realized gain/(loss) on U.S. Treasury securities	423	(3,764)
Net unrealized gain/(loss) on U.S. Treasury securities	(1,226)	4,123
Change in fair value of investments in unconsolidated trading companies	(4,773)	(3,279)
Net gain/(loss) on investments	215,637	(355,556)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	181,029	(416,877)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	181,029	(416,877)
Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net	977	488
Total Income/(loss)	977	488
Expenses:
Service Fees - Class 1	147	499
Due Diligence Fees	258	547
Trading Fees	13,305	29,246
Total Expenses	13,710	30,292
Investment (loss) - net	(12,733)	(29,804)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	47,971	261,001
Net realized gain/(loss) on private investment companies	1,507	(476,170)
Net realized gain/(loss) on U.S. Treasury securities	(235)	(943)
Net unrealized gain/(loss) on U.S. Treasury securities	(380)	(669)
Change in fair value of investments in unconsolidated trading companies	(960)	444
Net gain/(loss) on investments	47,903	(216,337)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	35,170	(246,141)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	35,170	(246,141)
Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net	1,024	472
Total Income/(loss)	1,024	472
Expenses:
Service Fees - Class 1	58	111
Due Diligence Fees	97	92
Trading Fees	10,050	7,765
Total Expenses	10,205	7,968
Investment (loss) - net	(9,181)	(7,496)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	110,809	236,900
Net realized gain/(loss) on private investment companies	21,791	(282,472)
Net unrealized gain/(loss) on swap contracts		(31,444)
Net realized gain/(loss) on U.S. Treasury securities	(394)	2,024
Net unrealized gain/(loss) on U.S. Treasury securities	(618)	415
Change in fair value of investments in unconsolidated trading companies	785	(4,087)
Net gain/(loss) on investments	132,373	(78,664)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	123,192	(86,160)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	123,192	(86,160)
Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net	158	9
Total Income/(loss)	158	9
Expenses:
Management Fees	4,595	4,704
Service Fees - Class 1	65,729	85,674
Risk analysis Fees	1,378	1,411
Trading Fees	109,550	138,508
Total Expenses	181,252	230,335
Investment (loss) - net	(181,094)	(230,326)
Other Fees		38
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options	109,163	(221,676)
Net unrealized gain/(loss) on private investment companies	365,892	729,962
Net realized gain/(loss) on private investment companies	200,304	(1,711,953)
Net change in open trade equity/(deficit)	(122,628)	(51,316)
Net unrealized gain/(loss) on swap contracts		202,399
Net realized gain/(loss) on U.S. Treasury securities	(9)	5,959
Net unrealized gain/(loss) on U.S. Treasury securities	(5,051)	(6,621)
Trading commissions	(348)	(3,683)
Change in fair value of investments in unconsolidated trading companies	(8,036)	(7,252)
Net gain/(loss) on investments	539,287	(1,064,181)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	358,193	(1,294,507)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	358,193	(1,294,507)
Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
Expenses:
Service Fees - Class 1	11,804	17,932
Trading Fees	12,010	15,445
Total Expenses	23,814	33,377
Investment (loss) - net	(23,814)	(33,377)
Other Fees
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	91,604	166,302
Net realized gain/(loss) on private investment companies	28,299	(290,557)
Net realized gain/(loss) on swap contracts		(91,989)
Net realized gain/(loss) on U.S. Treasury securities	(325)	(1,544)
Net unrealized gain/(loss) on U.S. Treasury securities	(132)	(739)
Change in fair value of investments in unconsolidated trading companies	149	(5,308)
Net gain/(loss) on investments	119,595	(223,835)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	95,781	(257,212)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	95,781	(257,212)
Frontier Global Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net
Total Income/(loss)
Expenses:
Service Fees - Class 1	20,452	27,786
Trading Fees	37,220	52,118
Total Expenses	57,672	79,904
Investment (loss) - net	(57,672)	(79,904)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	96,849	(753,170)
Net realized gain/(loss) on private investment companies	41,313	107,968
Net realized gain/(loss) on U.S. Treasury securities	(144)	1,039
Net unrealized gain/(loss) on U.S. Treasury securities	(427)	1,777
Change in fair value of investments in unconsolidated trading companies	(970)	(4,195)
Net gain/(loss) on investments	136,621	(646,581)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	78,949	(726,485)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	78,949	(726,485)
Frontier Heritage Fund [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net
Total Income/(loss)
Expenses:
Service Fees - Class 1	17,745	17,944
Trading Fees	25,996	28,037
Total Expenses	43,741	45,981
Investment (loss) - net	(43,741)	(45,981)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	156,345	(340,888)
Net realized gain/(loss) on private investment companies	21,910	(5,506)
Net realized gain/(loss) on swap contracts		(97,745)
Net unrealized gain/(loss) on swap contracts		(9,018)
Net realized gain/(loss) on U.S. Treasury securities	(367)	2,993
Net unrealized gain/(loss) on U.S. Treasury securities	(499)	(6,016)
Change in fair value of investments in unconsolidated trading companies	390	(41)
Net gain/(loss) on investments	177,779	(456,221)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	134,038	(502,202)
Less: Operations attributable to non-controlling interests		(95,914)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 134,038	$ (598,116)
Frontier Funds [Member] | The Series of the Frontier Funds [Member]
Investment income:
Interest - net			$ 1,624	$ 863
Total Income/(loss)			1,624	863
Expenses:
Service Fees - Class 1			1,550	10,650
Due Diligence Fees			2,309	5,455
Trading Fees			67,974	157,685
Total Expenses			71,833	173,790
Investment (loss) - net			(70,209)	(172,927)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies			303,721	769,326
Net realized gain/(loss) on private investment companies			65,228	(1,243,996)
Net unrealized gain/(loss) on swap contracts				(2,024,174)
Net realized gain/(loss) on U.S. Treasury securities			(1,318)	(20,030)
Net unrealized gain/(loss) on U.S. Treasury securities			(1,666)	27,341
Change in fair value of investments in unconsolidated trading companies			5,472	(4,288)
Net gain/(loss) on investments			371,437	(2,495,821)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS			301,228	(2,668,748)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS			$ 301,228	$ (2,668,748)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)			$ 5	$ (27.01)
Class 2 (in Dollars per share)			6.95	(31.70)
Class 3 (in Dollars per share)			$ 6.62	$ (29.52)
Class 1 [Member] | Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)	$ 3.06	$ (5.06)
Class 1 [Member] | Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)	(57.44)	(9.41)
Class 1 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)
Class 1 [Member] | Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)	2.47	(7.44)
Class 1 [Member] | Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)	3.61	(6.43)
Class 1 [Member] | Frontier Global Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)	2.96	(24.30)
Class 1 [Member] | Frontier Heritage Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1 (in Dollars per share)	5.49	(17.70)
Class 1a [Member] | Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)
Class 1a [Member] | Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)
Class 1a [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)		(3.11)
Class 2 [Member] | Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2 (in Dollars per share)	4.19	(5.72)
Class 2 [Member] | Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2 (in Dollars per share)	2.91	(11.06)
Class 2 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2 (in Dollars per share)	8.10	(5.39)
Class 2 [Member] | Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2 (in Dollars per share)	5.13	(10.93)
Class 2 [Member] | Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2 (in Dollars per share)	6.67	(9.41)
Class 2 [Member] | Frontier Global Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2 (in Dollars per share)	5.84	(34.55)
Class 2 [Member] | Frontier Heritage Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2 (in Dollars per share)	10.31	(26.93)
Class 2a [Member] | Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2a (in Dollars per share)
Class 2a [Member] | Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2a (in Dollars per share)
Class 2a [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2a (in Dollars per share)	5.25	(3.48)
Class 2a [Member] | Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2a (in Dollars per share)	4.49	(9.46)
Class 2a [Member] | Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 2a (in Dollars per share)
Class 3 [Member] | Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3 (in Dollars per share)	3.98	(5.29)
Class 3 [Member] | Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3 (in Dollars per share)	2.78	(10.33)
Class 3 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3 (in Dollars per share)	8.50	(5.65)
Class 3a [Member] | Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3a (in Dollars per share)
Class 3a [Member] | Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3a (in Dollars per share)
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3a (in Dollars per share)	5.59	(3.64)
Class 3a [Member] | Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3a (in Dollars per share)	4.47	(9.43)
Class 3a [Member] | Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 3a (in Dollars per share)
Class 1AP [Member] | Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)	3.80	(8.11)
Class 1AP [Member] | Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)	5.03	(7.09)
Class 1AP [Member] | Frontier Global Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)		(27.73)
Class 1AP [Member] | Frontier Heritage Fund [Member] | The Series of the Frontier Funds [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
Class 1AP (in Dollars per share)	$ 7.71	$ (20.12)

Statements of Changes in Owners

Statements of Changes in Owners’ Capital (Unaudited)	6 Months Ended
	Jun. 30, 2021USD ($)$ / sharesshares
Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 25,569,139
Payment made by Related Party
Payment made by Managing Owner
Net increase/(decrease) in Owners’ Capital resulting from operations	2,126,564
Owners' Capital, Ending balance	$ 23,382,228
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(4,313,475)
Limited Owners [Member] | Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 25,285,922
Payment made by Related Party
Payment made by Managing Owner
Net increase/(decrease) in Owners’ Capital resulting from operations	2,102,976
Owners' Capital, Ending balance	$ 23,140,723
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(4,248,175)
Managing Owner [Member] | Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 283,217
Payment made by Related Party
Payment made by Managing Owner
Net increase/(decrease) in Owners’ Capital resulting from operations	23,588
Owners' Capital, Ending balance	$ 241,505
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(65,300)
Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 4,182,971
Sale of Units
Redemption of Units (including transfers)	(1,075,432)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	301,228
Owners' Capital, Ending balance	3,408,767
Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	993,527
Redemption of Units (including transfers)	(264,981)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	79,192
Owners' Capital, Ending balance	807,738
Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	1,313,303
Sale of Units
Redemption of Units (including transfers)	(92,154)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	191,294
Owners' Capital, Ending balance	1,412,443
Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	12,110,279
Redemption of Units (including transfers)	(2,166,686)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	861,166
Owners' Capital, Ending balance	10,804,759
FrontierSelectFundMember | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	1,653,128
Redemption of Units (including transfers)	(236,095)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	204,774
Owners' Capital, Ending balance	1,621,807
Frontier Global Fund [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	2,930,649
Sale of Units
Redemption of Units (including transfers)	(317,123)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	167,587
Owners' Capital, Ending balance	2,781,113
FrontierHeritageFundMember | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	2,385,282
Sale of Units
Redemption of Units (including transfers)	(161,004)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	321,323
Owners' Capital, Ending balance	$ 2,545,601
Class 1 [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	2,122
Owners’ Capital - Units, Ending balance (in Shares) | shares	517
Class 1 [Member] | Frontier Diversified Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 154,260
Owners’ Capital - Units, Beginning balance (in Shares) | shares	2,122
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 72.68
Sale of Units
Redemption of Units (including transfers)	(121,614)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	7,525
Owners' Capital, Ending balance	$ 40,171
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(1,605)
Owners’ Capital - Units, Ending balance (in Shares) | shares	517
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 5
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 77.68
Class 1 [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	177
Class 1 [Member] | Frontier Masters Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 9,740
Owners’ Capital - Units, Beginning balance (in Shares) | shares	177
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 55.18
Transfer of Units In(Out)	$ (10,187)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	$ 447
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(177)
Change in net asset value per unit (in Dollars per share) | $ / shares	$ (55.18)
Class 1 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares
Class 1 [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	117,991
Owners’ Capital - Units, Ending balance (in Shares) | shares	97,671
Class 1 [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 9,430,532
Owners’ Capital - Units, Beginning balance (in Shares) | shares	117,991
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 79.93
Redemption of Units (including transfers)	$ (1,691,031)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	646,517
Owners' Capital, Ending balance	$ 8,386,018
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(20,320)
Owners’ Capital - Units, Ending balance (in Shares) | shares	97,671
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 5.93
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 85.86
Class 1 [Member] | FrontierSelectFundMember | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 1,575,328
Owners’ Capital - Units, Beginning balance (in Shares) | shares	26,906
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 58.55
Redemption of Units (including transfers)	$ (233,158)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	193,658
Owners' Capital, Ending balance	$ 1,535,828
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(3,697)
Owners’ Capital - Units, Ending balance (in Shares) | shares	23,209
Change in net asset value per unit for the six months ended June 30, 2021	$ 7.62
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 66.17
Class 1 [Member] | Frontier Global Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 2,741,972
Owners’ Capital - Units, Beginning balance (in Shares) | shares	24,725
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 110.90
Sale of Units
Redemption of Units (including transfers)	(315,123)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	153,889
Owners' Capital, Ending balance	$ 2,580,738
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(2,719)
Owners’ Capital - Units, Ending balance (in Shares) | shares	22,006
Change in net asset value per unit for the six months ended June 30, 2021	$ 6.38
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 117.28
Class 1 [Member] | FrontierHeritageFundMember | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 2,169,152
Owners’ Capital - Units, Beginning balance (in Shares) | shares	22,572
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 96.10
Sale of Units
Redemption of Units (including transfers)	(159,904)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	288,118
Owners' Capital, Ending balance	$ 2,297,366
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(1,546)
Owners’ Capital - Units, Ending balance (in Shares) | shares	21,026
Change in net asset value per unit for the six months ended June 30, 2021	$ 13.16
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 109.26
Class 2 [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	5,241
Owners’ Capital - Units, Ending balance (in Shares) | shares	4,492
Class 2 [Member] | Frontier Diversified Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 464,012
Owners’ Capital - Units, Beginning balance (in Shares) | shares	5,216
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 88.95
Sale of Units
Redemption of Units (including transfers)	(65,868)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	30,282
Owners' Capital, Ending balance	$ 428,426
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(749)
Owners’ Capital - Units, Ending balance (in Shares) | shares	4,467
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 6.95
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 95.90
Class 2 [Member] | Frontier Diversified Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 2,212
Owners’ Capital - Units, Beginning balance (in Shares) | shares	25
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	172
Owners' Capital, Ending balance	$ 2,384
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares	25
Class 2 [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	3,908
Owners’ Capital - Units, Ending balance (in Shares) | shares	3,038
Class 2 [Member] | Frontier Masters Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 257,673
Owners’ Capital - Units, Beginning balance (in Shares) | shares	3,815
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 67.54
Redemption of Units (including transfers)	$ (58,099)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	20,861
Owners' Capital, Ending balance	$ 220,435
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(817)
Owners’ Capital - Units, Ending balance (in Shares) | shares	2,998
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 5.98
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 73.52
Class 2 [Member] | Frontier Masters Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 6,265
Owners’ Capital - Units, Beginning balance (in Shares) | shares	93
Redemption of Units (including transfers)	$ (3,500)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	178
Owners' Capital, Ending balance	$ 2,943
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(53)
Owners’ Capital - Units, Ending balance (in Shares) | shares	40
Class 2 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	399
Owners’ Capital - Units, Ending balance (in Shares) | shares	394
Class 2 [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 30,334
Owners’ Capital - Units, Beginning balance (in Shares) | shares	353
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 85.99
Sale of Units
Redemption of Units (including transfers)	(423)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	4,354
Owners' Capital, Ending balance	$ 34,265
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(5)
Owners’ Capital - Units, Ending balance (in Shares) | shares	348
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 12.50
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 98.49
Class 2 [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 3,939
Owners’ Capital - Units, Beginning balance (in Shares) | shares	46
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	572
Owners' Capital, Ending balance	$ 4,511
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares	46
Class 2 [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	15,000
Owners’ Capital - Units, Ending balance (in Shares) | shares	11,954
Class 2 [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 1,906,359
Owners’ Capital - Units, Beginning balance (in Shares) | shares	14,603
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 130.54
Redemption of Units (including transfers)	$ (409,507)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	148,125
Owners' Capital, Ending balance	$ 1,644,977
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(3,046)
Owners’ Capital - Units, Ending balance (in Shares) | shares	11,557
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 11.80
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 142.34
Class 2 [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 51,810
Owners’ Capital - Units, Beginning balance (in Shares) | shares	397
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	$ 4,681
Owners' Capital, Ending balance	$ 56,491
Owners’ Capital - Units, Ending balance (in Shares) | shares	397
Class 2 [Member] | FrontierSelectFundMember | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 50,769
Owners’ Capital - Units, Beginning balance (in Shares) | shares	539
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 94.20
Redemption of Units (including transfers)	$ (481)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	7,406
Owners' Capital, Ending balance	$ 57,694
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(5)
Owners’ Capital - Units, Ending balance (in Shares) | shares	534
Change in net asset value per unit for the six months ended June 30, 2021	$ 13.87
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 108.07
Class 2 [Member] | FrontierSelectFundMember | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 17,210
Owners’ Capital - Units, Beginning balance (in Shares) | shares	183
Redemption of Units (including transfers)	$ (1,800)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	2,327
Owners' Capital, Ending balance	$ 17,737
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(19)
Owners’ Capital - Units, Ending balance (in Shares) | shares	164
Class 2 [Member] | Frontier Global Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 157,311
Owners’ Capital - Units, Beginning balance (in Shares) | shares	939
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 167.56
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	11,542
Owners' Capital, Ending balance	$ 168,853
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares	939
Change in net asset value per unit for the six months ended June 30, 2021	$ 12.29
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 179.85
Class 2 [Member] | Frontier Global Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 31,366
Owners’ Capital - Units, Beginning balance (in Shares) | shares	187
Sale of Units
Redemption of Units (including transfers)	(2,000)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	2,156
Owners' Capital, Ending balance	$ 31,522
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(12)
Owners’ Capital - Units, Ending balance (in Shares) | shares	175
Class 2 [Member] | FrontierHeritageFundMember | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 183,565
Owners’ Capital - Units, Beginning balance (in Shares) | shares	1,177
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 155.92
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	28,275
Owners' Capital, Ending balance	$ 211,840
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares	1,177
Change in net asset value per unit for the six months ended June 30, 2021	$ 24.01
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 179.93
Class 2 [Member] | FrontierHeritageFundMember | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 24,105
Owners’ Capital - Units, Beginning balance (in Shares) | shares	155
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	3,713
Owners' Capital, Ending balance	$ 27,818
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares	155
Class 3 [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	42,754
Owners’ Capital - Units, Ending balance (in Shares) | shares	32,661
Class 3 [Member] | Frontier Diversified Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 3,508,082
Owners’ Capital - Units, Beginning balance (in Shares) | shares	42,100
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 83.33
Sale of Units
Redemption of Units (including transfers)	(856,950)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	260,904
Owners' Capital, Ending balance	$ 2,912,036
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(9,726)
Owners’ Capital - Units, Ending balance (in Shares) | shares	32,374
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 6.62
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 89.95
Class 3 [Member] | Frontier Diversified Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 54,405
Owners’ Capital - Units, Beginning balance (in Shares) | shares	654
Sale of Units
Redemption of Units (including transfers)	(31,000)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	2,345
Owners' Capital, Ending balance	$ 25,750
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(367)
Owners’ Capital - Units, Ending balance (in Shares) | shares	287
Class 3 [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	11,333
Owners’ Capital - Units, Ending balance (in Shares) | shares	8,441
Class 3 [Member] | Frontier Masters Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 712,682
Owners’ Capital - Units, Beginning balance (in Shares) | shares	11,220
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 63.52
Redemption of Units (including transfers)	$ (199,882)
Transfer of Units In(Out)	10,187
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	57,256
Owners' Capital, Ending balance	$ 580,243
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares	153
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(2,992)
Owners’ Capital - Units, Ending balance (in Shares) | shares	8,381
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 5.71
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 69.23
Class 3 [Member] | Frontier Masters Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 7,167
Owners’ Capital - Units, Beginning balance (in Shares) | shares	113
Redemption of Units (including transfers)	$ (3,500)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	450
Owners' Capital, Ending balance	$ 4,117
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(53)
Owners’ Capital - Units, Ending balance (in Shares) | shares	60
Class 3 [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	10,828
Owners’ Capital - Units, Ending balance (in Shares) | shares	10,172
Class 3 [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 8,274
Owners’ Capital - Units, Beginning balance (in Shares) | shares	149
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,263
Owners' Capital, Ending balance	$ 9,537
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares	149
Noncontrolling Interest [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests
Owners' Capital, Ending balance
Noncontrolling Interest [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Noncontrolling Interest [Member] | Frontier Global Fund [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests
Owners' Capital, Ending balance
Noncontrolling Interest [Member] | FrontierHeritageFundMember | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests
Owners' Capital, Ending balance
Class 2a [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares
Class 2a [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares
Class 2a [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	1,535
Owners’ Capital - Units, Ending balance (in Shares) | shares	1,447
Class 2a [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 976,771
Owners’ Capital - Units, Beginning balance (in Shares) | shares	10,828
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 90.21
Sale of Units
Redemption of Units (including transfers)	(68,684)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	142,841
Owners' Capital, Ending balance	$ 1,050,928
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(656)
Owners’ Capital - Units, Ending balance (in Shares) | shares	10,172
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 13.11
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 103.32
Class 2a [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 76,583
Owners’ Capital - Units, Beginning balance (in Shares) | shares	1,386
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 55.29
Sale of Units
Redemption of Units (including transfers)	(4,962)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	11,103
Owners' Capital, Ending balance	$ 82,724
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(88)
Owners’ Capital - Units, Ending balance (in Shares) | shares	1,298
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 8.45
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 63.74
Class 2a [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	940
Owners’ Capital - Units, Ending balance (in Shares) | shares	671
Class 2a [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 30,961
Owners’ Capital - Units, Beginning balance (in Shares) | shares	274
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 113.20
Redemption of Units (including transfers)	$ (8,410)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	2,827
Owners' Capital, Ending balance	$ 25,378
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(68)
Owners’ Capital - Units, Ending balance (in Shares) | shares	206
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 10.27
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 123.47
Class 2a [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 75,416
Owners’ Capital - Units, Beginning balance (in Shares) | shares	666
Redemption of Units (including transfers)	$ (23,500)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	5,570
Owners' Capital, Ending balance	$ 57,486
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(201)
Owners’ Capital - Units, Ending balance (in Shares) | shares	465
Class 3a [Member] | Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares
Class 3a [Member] | Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	3,725
Owners’ Capital - Units, Ending balance (in Shares) | shares	3,422
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 216,354
Owners’ Capital - Units, Beginning balance (in Shares) | shares	3,707
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 58.37
Sale of Units
Redemption of Units (including transfers)	(18,085)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	31,000
Owners' Capital, Ending balance	$ 229,269
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(303)
Owners’ Capital - Units, Ending balance (in Shares) | shares	3,404
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 8.99
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 67.36
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 1,048
Owners’ Capital - Units, Beginning balance (in Shares) | shares	18
Sale of Units
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	161
Owners' Capital, Ending balance	$ 1,209
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Ending balance (in Shares) | shares	18
Class 3a [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	4,495
Owners’ Capital - Units, Ending balance (in Shares) | shares	4,207
Class 3a [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 507,148
Owners’ Capital - Units, Beginning balance (in Shares) | shares	4,495
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 112.81
Redemption of Units (including transfers)	$ (33,272)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	43,753
Owners' Capital, Ending balance	$ 517,629
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(288)
Owners’ Capital - Units, Ending balance (in Shares) | shares	4,207
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 10.24
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 123.05
Class 1AP [Member] | Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
Owners’ Capital - Units, Beginning balance (in Shares) | shares	1,116
Owners’ Capital - Units, Ending balance (in Shares) | shares	1,106
Class 1AP [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 108,053
Owners’ Capital - Units, Beginning balance (in Shares) | shares	1,116
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 96.81
Redemption of Units (including transfers)	$ (966)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	9,693
Owners' Capital, Ending balance	$ 116,780
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(10)
Owners’ Capital - Units, Ending balance (in Shares) | shares	1,106
Change in net asset value per unit (in Dollars per share) | $ / shares	$ 8.74
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 105.55
Class 1AP [Member] | FrontierSelectFundMember | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 9,821
Owners’ Capital - Units, Beginning balance (in Shares) | shares	138
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 70.99
Redemption of Units (including transfers)	$ (656)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,383
Owners' Capital, Ending balance	$ 10,548
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(8)
Owners’ Capital - Units, Ending balance (in Shares) | shares	130
Change in net asset value per unit for the six months ended June 30, 2021	$ 10.45
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 81.44
Class 1AP [Member] | FrontierHeritageFundMember | Limited Owners [Member] | The Series of Frontier Funds [Member]
Owners' Capital, Beginning balance	$ 8,460
Owners’ Capital - Units, Beginning balance (in Shares) | shares	73
Net asset value per unit, Beginning balance (in Dollars per share) | $ / shares	$ 116.50
Sale of Units
Redemption of Units (including transfers)	(1,100)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,217
Owners' Capital, Ending balance	$ 8,577
Owners’ Capital - Units, Sale of Units (including transfers) (in Shares) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) (in Shares) | shares	(9)
Owners’ Capital - Units, Ending balance (in Shares) | shares	64
Change in net asset value per unit for the six months ended June 30, 2021	$ 17.95
Net asset value per unit, Ending balance (in Dollars per share) | $ / shares	$ 134.45

Statements of Cash Flows (Unaud

Statements of Cash Flows (Unaudited) - Series of Frontier Funds [Member] - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	$ 2,126,564	$ (10,431,047)
Change in:
Net change in ownership allocation of U.S. Treasury securities	(8,602)
Net unrealized gain/(loss) on private investment companies	(1,901,388)	(2,327,472)
Net realized gain/(loss) on private investment companies	(672,696)	(3,974,277)
Net realized gain/(loss) on swap contracts		(189,734)
Net unrealized gain/(loss) on swap contracts		7,241,457
Net realized gain/(loss) on U.S. Treasury securities	10,320	45,731
Net unrealized gain/(loss) on U.S. Treasury securities	10,500	(4,581)
(Purchases) sales of:
Sales of swap contracts		1,491,965
(Purchases) of U.S. Treasury securities	(1,987,803)	(4,338,268)
Sales of U.S. Treasury securities	2,762,061	4,928,672
U.S. Treasury interest and premium paid/amortized	5,917	9,780
(Purchases) of Private Investment Companies	(4,210,408)	3,300,220
Sale of Private Investment Companies	7,572,526	12,086,455
Reduction of collateral in Swap contracts		(1,564,238)
Increase and/or decrease in:
Receivable from futures commission merchants	(62,196)	1,902,708
Open trade equity/(deficit), at fair value	171,872	124,301
Investments in unconsolidated trading companies, at fair value	(44,277)
Interest receivable	14,802	11,344
Receivable from related parties	26,129
Redemptions receivable from private investment companies	181,323	(360,786)
Other assets		(3,365)
Interest payable
Management fees payable to Managing Owner	(7,343)	28
Interest payable to Managing Owner	374	1,249
Service fees payable to Managing Owner	(1,679)	(26,215)
Trading fees payable to Managing Owner	(894)	(62,547)
Risk analysis fees payable	1,392	55
Payables to related parties	(26,129)
Subscriptions in advance for service fee rebates	17,657	23,958
Other liabilities	803	(6,852)
Net cash provided by (used in) operating activities	3,978,825	7,878,541
Cash Flows from Financing Activities:
Sale of Units (including transfers)
Redemption of Units (including transfers)	(4,313,475)	(7,148,924)
Redemptions payable	(20,907)	(39,980)
Net cash provided by (used in) financing activities	(4,334,382)	(7,188,904)
Net increase (decrease) in cash and cash equivalents	(355,557)	689,637
Cash and cash equivalents, beginning of period	468,466	367,568
Cash and cash equivalents, end of period	112,909	1,057,205
Frontier Diversified Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	301,228	(2,668,748)
Change in:
Net change in ownership allocation of U.S. Treasury securities	167,625	533,930
Net unrealized gain/(loss) on private investment companies	(303,721)	(769,326)
Net realized gain/(loss) on private investment companies	(65,228)	(1,243,996)
Net unrealized gain/(loss) on swap contracts		2,024,174
Net realized gain/(loss) on U.S. Treasury securities	1,318	(20,030)
Net unrealized gain/(loss) on U.S. Treasury securities	1,666	(27,341)
(Purchases) sales of:
(Purchases) of U.S. Treasury securities	(256,616)	(797,978)
Sales of U.S. Treasury securities	325,294	297,067
U.S. Treasury interest and premium paid/amortized	1,624
(Purchases) of Private Investment Companies	(781,274)	1,958,493
Sale of Private Investment Companies	1,571,835	4,142,600
Reduction of collateral in Swap contracts		(269,147)
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(13)	8,093
Interest receivable	4,683	1,657
Receivable from related parties	4,892
Redemptions receivable from private investment companies	31,886	(235,089)
Other assets		170,381
Interest payable to Managing Owner
Service fees payable to Managing Owner	(227)	(2,690)
Trading fees payable to Managing Owner	(1,989)	(19,853)
Subscriptions in advance for service fee rebates		118
Other liabilities	(1,137)
Net cash provided by (used in) operating activities	1,001,846	3,082,315
Cash Flows from Financing Activities:
Payment for redemption of units	(1,075,432)	(3,020,866)
Change in owner redemptions payable		80,730
Net cash provided by (used in) financing activities	(1,075,432)	(2,940,136)
Net increase (decrease) in cash and cash equivalents	(73,586)	142,179
Cash and cash equivalents, beginning of period	87,715	56,263
Cash and cash equivalents, end of period	14,129	198,442
Frontier Masters Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	79,192	(268,351)
Change in:
Net change in ownership allocation of U.S. Treasury securities	(73,093)	(165,522)
Net unrealized gain/(loss) on private investment companies	(82,310)	(507,695)
Net realized gain/(loss) on private investment companies	(14,192)	(711,307)
Net unrealized gain/(loss) on swap contracts
Net realized gain/(loss) on U.S. Treasury securities	1,239	6,361
Net unrealized gain/(loss) on U.S. Treasury securities	630	2,598
(Purchases) sales of:
(Purchases) of U.S. Treasury securities	(127,722)	(432,171)
Sales of U.S. Treasury securities	155,012	604,026
U.S. Treasury interest and premium paid/amortized	1,832	1,478
(Purchases) of Private Investment Companies	(95,425)	872,824
Sale of Private Investment Companies	439,370	1,085,001
Reduction of collateral in Swap contracts
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(4,939)	6,972
Interest receivable	(886)	831
Receivable from related parties	266
Redemptions receivable from private investment companies	24,837	(97,546)
Other assets		(109)
Interest payable to Managing Owner
Service fees payable to Managing Owner	(23)	(62)
Trading fees payable to Managing Owner	(1,020)	(3,588)
Subscriptions in advance for service fee rebates		184
Other liabilities	521	(499)
Net cash provided by (used in) operating activities	303,289	393,425
Cash Flows from Financing Activities:
Payment for redemption of units	(264,981)	(369,224)
Change in owner redemptions payable	(38,128)
Net cash provided by (used in) financing activities	(303,109)	(369,224)
Net increase (decrease) in cash and cash equivalents	180	24,201
Cash and cash equivalents, beginning of period	4,771	25,639
Cash and cash equivalents, end of period	4,951	49,840
Frontier Long/Short Commodity Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	191,294	27,537
Change in:
Net change in ownership allocation of U.S. Treasury securities	(60,288)	(244,354)
Net unrealized gain/(loss) on private investment companies	(175,088)	(177,059)
Net realized gain/(loss) on private investment companies	(23,096)	(349,843)
Net unrealized gain/(loss) on swap contracts		(219,997)
Net realized gain/(loss) on U.S. Treasury securities	2,344	7,218
Net unrealized gain/(loss) on U.S. Treasury securities	643	1,501
(Purchases) sales of:
(Purchases) of U.S. Treasury securities	(154,028)	(295,190)
Sales of U.S. Treasury securities	548,272	544,727
U.S. Treasury interest and premium paid/amortized	2,303	1,119
(Purchases) of Private Investment Companies	(614,286)	658,598
Sale of Private Investment Companies	269,876	184,908
Reduction of collateral in Swap contracts
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	7,405	8,278
Interest receivable	6,695	1,099
Receivable from related parties	5,205
Redemptions receivable from private investment companies	1,251	(39,796)
Other assets		(173)
Interest payable to Managing Owner	(50)
Service fees payable to Managing Owner	2
Trading fees payable to Managing Owner	1,211	(1,042)
Subscriptions in advance for service fee rebates	(1)
Other liabilities	(2,087)	(534)
Net cash provided by (used in) operating activities	7,577	106,997
Cash Flows from Financing Activities:
Payment for redemption of units	(92,154)	(55,182)
Change in owner redemptions payable		(6,585)
Net cash provided by (used in) financing activities	(92,154)	(61,767)
Net increase (decrease) in cash and cash equivalents	(84,577)	45,230
Cash and cash equivalents, beginning of period	93,327	34,272
Cash and cash equivalents, end of period	8,750	79,502
Frontier Balanced Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	861,166	(7,037,224)
Change in:
Net change in ownership allocation of U.S. Treasury securities	391,346	(70,073)
Net unrealized gain/(loss) on private investment companies	(754,501)	(636,269)
Net realized gain/(loss) on private investment companies	(249,166)	(1,805,553)
Net unrealized gain/(loss) on swap contracts		5,635,109
Net realized gain/(loss) on U.S. Treasury securities	630	26,115
Net unrealized gain/(loss) on U.S. Treasury securities	5,303	5,025
(Purchases) sales of:
(Purchases) of U.S. Treasury securities	(902,849)	(1,896,782)
Sales of U.S. Treasury securities	901,441	2,006,589
U.S. Treasury interest and premium paid/amortized	158	6,320
(Purchases) of Private Investment Companies	(1,809,666)	1,632,758
Sale of Private Investment Companies	3,365,145	3,201,789
Reduction of collateral in Swap contracts		(1,178,696)
Increase and/or decrease in:
Receivable from futures commission merchants	(62,196)	1,902,708
Open trade equity/(deficit), at fair value	171,872	124,301
Investments in unconsolidated trading companies, at fair value	(28,931)	32,182
Interest receivable	7,306	3,840
Receivable from related parties	14,602
Redemptions receivable from private investment companies	55,473	165,350
Other assets		(1,194)
Management fees payable to Managing Owner	(7,343)	28
Interest payable to Managing Owner	494	447
Service fees payable to Managing Owner	(1,900)	(17,916)
Trading fees payable to Managing Owner	(1,338)	(25,686)
Risk analysis fees payable	1,392	55
Payables to related parties
Subscriptions in advance for service fee rebates	11,418	16,002
Other liabilities	1,673	(2,372)
Net cash provided by (used in) operating activities	1,971,529	2,086,853
Cash Flows from Financing Activities:
Payment for redemption of units	(2,166,686)	(1,935,386)
Change in owner redemptions payable		(39,059)
Net cash provided by (used in) financing activities	(2,166,686)	(1,974,445)
Net increase (decrease) in cash and cash equivalents	(195,157)	112,408
Cash and cash equivalents, beginning of period	261,803	118,506
Cash and cash equivalents, end of period	66,646	230,914
Frontier Select Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	204,774	(212,523)
Change in:
Net change in ownership allocation of U.S. Treasury securities	(124,904)	(97,145)
Net unrealized gain/(loss) on private investment companies	(101,623)	(143,350)
Net realized gain/(loss) on private investment companies	(142,733)	(282,634)
Net realized gain/(loss) on U.S. Treasury securities	1,342	3,748
Net unrealized gain/(loss) on U.S. Treasury securities	322	2,955
(Purchases) sales of:
(Purchases) of U.S. Treasury securities	(130,240)	(498,944)
Sales of U.S. Treasury securities	216,892	697,463
U.S. Treasury interest and premium paid/amortized
(Purchases) of Private Investment Companies	(202,221)	(499,776)
Sale of Private Investment Companies	478,134	1,340,129
Increase and/or decrease in:
Receivable from futures commission merchants
Investments in unconsolidated trading companies, at fair value	(3,273)	505,281
Interest receivable	(756)	2,266
Receivable from related parties
Redemptions receivable from private investment companies	67,876	(194,548)
Other assets
Management fees payable to Managing Owner
Interest payable to Managing Owner	(72)	153
Service fees payable to Managing Owner	(2)	(1,733)
Trading fees payable to Managing Owner	177	(2,314)
Risk analysis fees payable
Payables to related parties	(26,129)
Subscriptions in advance for service fee rebates	915	1,536
Other liabilities	388	(1,197)
Net cash provided by (used in) operating activities	238,867	619,367
Cash Flows from Financing Activities:
Payment for redemption of units	(236,095)	(685,847)
Change in owner redemptions payable		6,048
Net cash provided by (used in) financing activities	(236,095)	(679,799)
Net increase (decrease) in cash and cash equivalents	2,772	(60,432)
Cash and cash equivalents, beginning of period		61,345
Cash and cash equivalents, end of period	2,772	913
Frontier Global Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	167,587	(252,776)
Change in:
Net change in ownership allocation of U.S. Treasury securities	(220,772)	(339,450)
Net unrealized gain/(loss) on private investment companies	(143,997)	504,048
Net realized gain/(loss) on private investment companies	(123,999)	417,626
Net realized gain/(loss) on U.S. Treasury securities	1,879	12,532
Net unrealized gain/(loss) on U.S. Treasury securities	953	3,714
(Purchases) sales of:
(Purchases) of U.S. Treasury securities	(225,077)	(484,934)
Sales of U.S. Treasury securities	376,788	833,751
(Purchases) of Private Investment Companies	(356,758)	(1,200,262)
Sale of Private Investment Companies	846,796	1,699,632
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(7,323)	8,559
Interest receivable	(1,387)	917
Receivable from related parties	319
Redemptions receivable from private investment companies		(103,858)
Interest payable to Managing Owner	(94)	110
Service fees payable to Managing Owner	(41)	(3,384)
Trading fees payable to Managing Owner	783	(6,875)
Subscriptions in advance for service fee rebates	2,101	2,689
Other liabilities	791	(628)
Net cash provided by (used in) operating activities	318,549	1,091,411
Cash Flows from Financing Activities:
Payment for redemption of units	(317,123)	(1,007,284)
Change in owner redemptions payable		(71,379)
Net cash provided by (used in) financing activities	(317,123)	(1,078,663)
Net increase (decrease) in cash and cash equivalents	1,426	12,748
Cash and cash equivalents, beginning of period	5,694	27,532
Cash and cash equivalents, end of period	7,120	40,280
Frontier Heritage Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	321,323	(18,962)
Change in:
Net change in ownership allocation of U.S. Treasury securities	(88,516)	(308,700)
Net unrealized gain/(loss) on private investment companies	(340,148)	(75,226)
Net realized gain/(loss) on private investment companies	(54,282)	(1,135)
Net realized gain/(loss) on swap contracts		(97,745)
Net unrealized gain/(loss) on swap contracts		(197,829)
Net realized gain/(loss) on U.S. Treasury securities	1,568	9,787
Net unrealized gain/(loss) on U.S. Treasury securities	983	6,967
(Purchases) sales of:
Sales of swap contracts		1,491,965
(Purchases) of U.S. Treasury securities	(191,271)	(431,944)
Sales of U.S. Treasury securities	238,362	539,191
(Purchases) of Private Investment Companies	(350,778)	(301,869)
Sale of Private Investment Companies	601,370	617,306
Reduction of collateral in Swap contracts		1,691,617
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(7,203)	(18,113)
Interest receivable	(853)	734
Advance on unrealized Swap Appreciation		(1,900,000)
Receivable from related parties	845
Redemptions receivable from private investment companies		(27,205)
Other assets		(364)
Interest payable to Managing Owner	96	539
Service fees payable to Managing Owner	512	(430)
Trading fees payable to Managing Owner	1,282	(3,189)
Subscriptions in advance for service fee rebates	3,224	3,296
Other liabilities	654	(1,488)
Net cash provided by (used in) operating activities	137,168	977,203
Cash Flows from Financing Activities:
Payment for redemption of units	(161,004)	(75,142)
Change in non-controlling interest		(479,024)
Change in owner redemptions payable	17,221	(9,735)
Net cash provided by (used in) financing activities	(143,783)	(563,901)
Net increase (decrease) in cash and cash equivalents	(6,615)	413,302
Cash and cash equivalents, beginning of period	15,156	44,011
Cash and cash equivalents, end of period	$ 8,541	$ 457,313

Schedules of Investments

Schedules of Investments	6 Months Ended
	Jun. 30, 2021
Condensed Financial Information Disclosure [Abstract]
Schedules of Investments	Frontier Frontier Frontier Diversified Fund Masters Fund Long/Short Commodity Fund Fair % of Total Capital Fair % of Total Capital Fair % of Total Capital Description Value (Net Asset Value) Value (Net Asset Value) Value (Net Asset Value) PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 957,311 28.08 % $ - 0.00 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 190,967 5.60 % - 0.00 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 615,570 18.06 % - 0.00 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 674,082 19.77 % 324,005 40.11 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 472,188 13.85 % 237,946 29.46 % 522,927 37.02 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC 312,873 9.18 % 205,197 25.40 % - 0.00 % Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC - 0.00 % - 0.00 % 281,563 19.93 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC - 0.00 % - 0.00 % 476,157 33.71 % Total Private Investment Companies $ 3,222,991 94.54 % $ 767,148 94.97 % $ 1,280,647 90.66 % INVESTMENT IN UNCONSOLIDATED TRADING COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 16,682 0.49 % $ 5,846 0.72 % $ 10,331 0.73 % Total Investment in Unconsolidated Trading Companies $ 16,682 0.49 % $ 5,846 0.72 % $ 10,331 0.73 % U.S. TREASURY SECURITIES (2) Fair Value Fair Value Fair Value $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 186,482 5.47 % $ 65,347 8.09 % $ 115,492 8.18 % $ 186,482 5.47 % $ 65,347 8.09 % $ 115,492 8.18 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 149,102 $ 52,248 $ 92,341 $ 149,102 $ 52,248 $ 92,341 Additional Disclosure on U.S. Treasury Securities Cost Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 187,918 $ 65,850 $ 116,381 $ 187,918 $ 65,850 $ 116,381 Frontier Balanced Fund Frontier Select Fund % of Total % of Total Description Fair (Net Asset Fair (Net Asset LONG FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ (811 ) -0.01 % $ - 0.00 % Various agriculture futures contracts (Europe) (2,477 ) -0.02 % - 0.00 % Various agriculture futures contracts (U.S.) (399 ) 0.00 % - 0.00 % Various base metals futures contracts (U.S.) (2,644 ) -0.02 % - 0.00 % Various currency futures contracts (Europe) (16,585 ) -0.15 % - 0.00 % Various currency futures contracts (Far East) 2,707 0.03 % - 0.00 % Various currency futures contracts (Latin America) 2,605 0.02 % - 0.00 % Various currency futures contracts (U.S.) (1,200 ) -0.01 % - 0.00 % Various energy futures contracts (U.S.) 14,670 0.14 % - 0.00 % Various interest rates futures contracts (Europe) (186,275 ) -1.72 % - 0.00 % Various interest rates futures contracts (Far East) (90 ) 0.00 % - 0.00 % Various interest rates futures contracts (U.S.) 3,438 0.03 % - 0.00 % Various precious metal futures contracts (U.S.) (12,366 ) -0.11 % - 0.00 % Various stock index futures contracts (Europe) (1,804 ) -0.02 % - 0.00 % Various stock index futures contracts (Far East) 166 0.00 % - 0.00 % Total Long Futures Contracts $ (201,065 ) -1.84 % $ - 0.00 % SHORT FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ 6,829 0.06 % $ - 0.00 % Various agriculture futures contracts (Europe) (1,009 ) -0.01 % - 0.00 % Various agriculture futures contracts (U.S.) 4,675 0.04 % - 0.00 % Various base metals futures contracts (U.S.) (2,038 ) -0.02 % - 0.00 % Various currency futures contracts (Europe) 9,569 0.09 % - 0.00 % Various currency futures contracts (Far East) (1,932 ) -0.02 % - 0.00 % Various currency futures contracts (Latin America) 895 0.01 % - 0.00 % Various energy futures contracts (U.S.) (770 ) -0.01 % - 0.00 % Various interest rates futures contracts (Europe) 118,204 1.09 % - 0.00 % Various interest rates futures contracts (U.S.) (4,906 ) -0.05 % - 0.00 % Various precious metal futures contracts (U.S.) (1,339 ) -0.01 % - 0.00 % Various stock index futures contracts (Europe) 1,455 0.01 % - 0.00 % Total Short Futures Contracts $ 129,633 1.18 % $ - 0.00 % Total Open Trade Equity (Deficit) $ (71,432 ) -0.66 % $ - 0.00 % PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 2,240,416 20.74 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 802,805 7.43 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 1,323,957 12.25 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 1,580,537 14.63 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 2,644,643 24.48 % 951,298 58.66 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC 1,384,082 12.81 % 655,810 40.44 % Total Private Investment Companies $ 9,976,440 92.34 % $ 1,607,108 99.10 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 78,686 0.73 % $ 3,273 0.20 % Total Investment in Unconsolidated Trading Companies $ 78,686 0.73 % $ 3,273 0.20 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 879,612 8.14 % $ 36,588 2.26 % $ 879,612 8.14 % $ 36,588 2.26 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 703,294 $ 29,254 $ 703,294 $ 29,254 Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 886,384 $ 36,869 $ 886,384 $ 36,869 Frontier Global Fund Frontier Heritage Fund % of Total % of Total Description Fair (Net Asset Fair (Net Asset PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ 2,846,614 102.36 % $ 1,559,439 61.26 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC - 0.00 % 951,861 37.39 % Total Private Investment Companies $ 2,846,614 102.36 % $ 2,511,300 98.65 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 8,406 0.30 % $ 10,083 0.40 % Total Investment in Unconsolidated Trading Companies $ 8,406 0.30 % $ 10,083 0.40 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 93,971 3.38 % $ 112,721 4.43 % $ 93,971 3.38 % $ 112,721 4.43 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 75,135 $ 90,126 $ 75,135 $ 90,126 Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 94,695 $ 113,589 $ 94,695 $ 113,589 Frontier Frontier Frontier Diversified Fund Masters Fund Long/Short Commodity Fund % of Total % of Total % of Total Description Fair (Net Asset Fair (Net Asset Fair (Net Asset PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 1,066,074 25.49 % $ - 0.00 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 414,692 9.91 % - 0.00 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 672,766 16.08 % - 0.00 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 732,066 17.50 % 486,659 48.98 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 435,119 10.40 % 258,609 26.03 % 272,294 20.73 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC 323,886 7.74 % 269,323 27.11 % - 0.00 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC - 0.00 % - 0.00 % 465,759 35.46 % Total Private Investment Companies $ 3,644,603 87.12 % $ 1,014,591 102.12 % $ 738,053 56.19 % INVESTMENT IN UNCONSOLIDATED TRADING COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 16,669 0.40 % $ 907 0.09 % $ 17,736 1.35 % Total Investment in Unconsolidated Trading Companies $ 16,669 0.40 % $ 907 0.09 % $ 17,736 1.35 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value Fair Value $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 427,393 10.22 % $ 23,245 2.34 % $ 454,738 34.63 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 328,604 $ 17,872 $ 349,629 Additional Disclosure on U.S. Treasury Securities Cost Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 427,509 $ 23,251 $ 454,862 Frontier Balanced Fund Frontier Select Fund % of Total % of Total Description Fair Value (Net Asset Fair Value (Net Asset LONG FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ 72,005 0.59 % $ - 0.00 % Various agriculture futures contracts (Europe) 9,803 0.08 % - 0.00 % Various agriculture futures contracts (U.S.) 87,496 0.72 % - 0.00 % Various base metals futures contracts (U.S.) 22,858 0.19 % - 0.00 % Various currency futures contracts (Europe) 10,573 0.09 % - 0.00 % Various currency futures contracts (Latin America) 5,833 0.05 % - 0.00 % Various currency futures contracts (U.S.) (100 ) 0.00 % - 0.00 % Various interest rates futures contracts (Europe) 148,949 1.23 % - 0.00 % Various interest rates futures contracts (Far East) 2,882 0.02 % - 0.00 % Various interest rates futures contracts (U.S.) 2,438 0.02 % - 0.00 % Various precious metal futures contracts (U.S.) 28,625 0.24 % - 0.00 % Various soft futures contracts (U.S.) 52,349 0.43 % - 0.00 % Various stock index futures contracts (Far East) 5,312 0.04 % - - Total Long Futures Contracts $ 449,023 3.70 % $ - 0.00 % SHORT FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ (30,963 ) -0.26 % $ - 0.00 % Various agriculture futures contracts (Europe) (10,797 ) -0.09 % - 0.00 % Various agriculture futures contracts (U.S.) (92,738 ) -0.77 % - 0.00 % Various base metals futures contracts (U.S.) (10,289 ) -0.08 % - 0.00 % Various currency futures contracts (Europe) (10,381 ) -0.09 % - 0.00 % Various currency futures contracts (Latin America) 2,512 0.02 % - 0.00 % Various currency futures contracts (U.S.) 2,300 0.02 % - 0.00 % Various interest rates futures contracts (Europe) (127,832 ) -1.06 % - 0.00 % Various interest rates futures contracts (Far East) (2,482 ) -0.02 % - 0.00 % Various interest rates futures contracts (U.S.) 3,656 0.03 % - 0.00 % Various precious metal futures contracts (U.S.) (25,560 ) -0.21 % - 0.00 % Various soft futures contracts (U.S.) (42,669 ) -0.35 % - 0.00 % Various stock index futures contracts (Far East) (3,340 ) -0.03 % - 0.00 % Total Short Futures Contracts $ (348,583 ) -2.89 % $ - 0.00 % Total Open Trade Equity (Deficit) $ 100,440 0.81 % $ - 0.00 % PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 2,311,240 19.08 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 1,581,941 13.06 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 982,020 8.11 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 1,600,611 13.22 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 2,612,336 21.57 % 956,968 57.89 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 1,440,104 11.89 % 681,697 41.24 % Total Private Investment Companies $ 10,528,252 86.93 % $ 1,638,665 99.13 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 49,755 0.41 % $ - 0.00 % Total Investment in Unconsolidated Trading Companies $ 49,755 0.41 % $ - 0.00 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 1,275,641 10.53 % $ - 0.00 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 980,787 $ - Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 1,275,989 $ - Frontier Global Fund Frontier Heritage Fund % of Total % of Total Description Fair Value (Net Asset Fair Value (Net Asset PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ 3,068,656 104.71 % $ 1,539,331 64.53 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC - - 828,131 34.72 % Total Private Investment Companies $ 3,068,656 104.71 % $ 2,367,462 99.25 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 1,083 0.04 % $ 2,880 0.12 % Total Investment in Unconsolidated Trading Companies $ 1,083 0.04 % $ 2,880 0.12 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 27,742 0.95 % $ 73,847 3.10 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 21,330 $ 56,778 Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 27,750 $ 73,867 Fair % of Total Capital Description Value (Net Asset Value) LONG FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ (811 ) 0.00 % Various agriculture futures contracts (Europe) (2,477 ) -0.01 % Various agriculture futures contracts (U.S.) (399 ) 0.00 % Various base metals futures contracts (U.S.) (2,644 ) -0.01 % Various currency futures contracts (Europe) (16,585 ) -0.07 % Various currency futures contracts (Far East) 2,707 0.01 % Various currency futures contracts (Latin America) 2,605 0.01 % Various currency futures contracts (U.S.) (1,200 ) -0.01 % Various energy futures contracts (U.S.) 14,670 0.06 % Various interest rates futures contracts (Europe) (186,275 ) -0.80 % Various interest rates futures contracts (Far East) (90 ) 0.00 % Various interest rates futures contracts (U.S.) 3,438 0.01 % Various precious metal futures contracts (U.S.) (12,366 ) -0.05 % Various stock index futures contracts (Europe) (1,804 ) -0.01 % Various stock index futures contracts (Far East) 166 0.00 % Total Long Futures Contracts $ (201,065 ) -0.87 % SHORT FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ 6,829 0.03 % Various agriculture futures contracts (Europe) (1,009 ) 0.00 % Various agriculture futures contracts (U.S.) 4,675 0.02 % Various base metals futures contracts (U.S.) (2,038 ) -0.01 % Various currency futures contracts (Europe) 9,569 0.04 % Various currency futures contracts (Far East) (1,932 ) -0.01 % Various currency futures contracts (Latin America) 895 0.00 % Various energy futures contracts (U.S.) (770 ) 0.00 % Various interest rates futures contracts (Europe) 118,204 0.51 % Various interest rates futures contracts (U.S.) (4,906 ) -0.02 % Various precious metal futures contracts (U.S.) (1,339 ) -0.01 % Various stock index futures contracts (Europe) 1,455 0.01 % Total Short Futures Contracts $ 129,633 0.56 % Total Open Trade Equity (Deficit) $ (71,432 ) -0.31 % Fair % of Total Capital Value (Net Asset Value) PRIVATE INVESTMENT COMPANIES (2) Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) $ 281,563 1.20 % Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 3,197,727 13.68 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 993,772 4.25 % Galaxy Plus Fund - Quest Fit Feeder Fund (535) LLC 133,307 0.57 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 1,939,527 8.29 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 6,984,677 29.87 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 5,780,863 24.72 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 2,557,962 10.94 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC 476,157 2.04 % Total Private Investment Companies $ 22,345,555 95.56 % U.S. TREASURY SECURITIES FACE VALUE $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 1,490,213 6.37 % Total U.S. Treasury Securities $ 1,490,213 6.37 % Fair % of Total Capital Description Value (Net Asset Value) LONG FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ 72,005 0.28 % Various agriculture futures contracts (Europe) 9,803 0.04 % Various agriculture futures contracts (U.S.) 87,496 0.34 % Various base metals futures contracts (U.S.) 22,858 0.09 % Various currency futures contracts (U.S.) (100 ) 0.00 % Various currency futures contracts (Europe) 10,573 0.04 % Various currency futures contracts (Latin America) 5,833 0.02 % Various interest rates futures contracts (Europe) 148,949 0.58 % Various interest rates futures contracts (Far East) 2,882 0.01 % Various interest rates futures contracts (U.S.) 2,438 0.01 % Various precious metal futures contracts (U.S.) 28,625 0.11 % Various soft futures contracts (U.S.) 52,349 0.20 % Various stock index futures contracts (Far East) 5,312 0.02 % Total Long Futures Contracts $ 449,023 1.74 % SHORT FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ (30,963 ) -0.12 % Various agriculture futures contracts (Europe) (10,797 ) -0.04 % Various agriculture futures contracts (U.S.) (92,738 ) -0.36 % Various base metals futures contracts (U.S.) (10,289 ) -0.04 % Various currency futures contracts (U.S.) 2,300 0.01 % Various currency futures contracts (Europe) (10,381 ) -0.04 % Various currency futures contracts (Latin America) 2,512 0.01 % Various interest rates futures contracts (Europe) (127,832 ) -0.50 % Various interest rates futures contracts (Far East) (2,482 ) -0.01 % Various interest rates futures contracts (U.S.) 3,656 0.01 % Various precious metal futures contracts (U.S.) (25,560 ) -0.10 % Various soft futures contracts (U.S.) (42,669 ) -0.17 % Various stock index futures contracts (Far East) (3,340 ) -0.01 % Total Short Futures Contracts $ (348,583 ) -1.36 % Total Open Trade Equity (Deficit) $ 100,440 0.38 % PRIVATE INVESTMENT COMPANIES (2) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 3,377,314 13.21 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 1,996,633 7.81 % Galaxy Plus Fund - Quest Fit Feeder Fund (535) LLC 89,029 0.35 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 1,654,786 6.47 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 7,427,324 29.05 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 5,363,456 20.98 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 2,715,008 10.62 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC 465,759 1.82 % Total Private Investment Companies $ 23,089,312 90.31 % U.S. TREASURY SECURITIES FACE VALUE $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 2,282,606 8.93 % Total U.S. Treasury Securities $ 2,282,606 8.93 %

Organization and Purpose

Organization and Purpose	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Organization and Purpose [Line Items]
Organization and Purpose	1. Organization and Purpose Frontier Funds, which is referred to in this report as the “Trust”, was formed on August 8, 2003, as a Delaware statutory trust. Please refer to the consolidated financial statements of the Trust included within this periodic report. The Trust is a multi-advisor commodity pool, as described in Commodity Futures Trading Commission (“CFTC”) Regulation § 4.10(d)(2). The Trust has authority to issue separate series, or each, a Series, of units of beneficial interest (the “Units”) pursuant to the requirements of the Delaware Statutory Trust Act, as amended (the “Trust Act”). The assets of each Series are valued and accounted for separately from the assets of other Series. The Trust is not registered as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”). It is managed by Frontier Fund Management LLC (the “Managing Owner”). Purchasers of Units are limited owners of the Trust (“Limited Owners”) with respect to beneficial interests of the Series’ Units purchased. The Trust Act provides that, except as otherwise provided in the second amended and restated declaration of trust and trust agreement dated December 9, 2013, as further amended, by and among the Managing Owner, Wilmington Trust Company as trustee and the unitholders, as may be amended from time to time (“Trust Agreement”), unitholders of the Trust will have the same limitation of liability as do stockholders of private corporations organized under the General Corporation Law of the State of Delaware. The Trust Agreement confers substantially the same limited liability, and contains the same limited exceptions thereto, as would a limited partnership agreement for a Delaware limited partnership engaged in like transactions as the Trust. In addition, pursuant to the Trust Agreement, the Managing Owner of the Trust is liable for obligations of a Series in excess of that Series’ assets. Limited Owners do not have any such liability. The Managing Owner will make contributions to the Series of the Trust necessary to maintain at least a 1% interest in the aggregate capital, profits and losses of the combined Series of the Trust. The Trust has been organized to pool investor funds for the purpose of trading in the United States (“U.S.”) and international markets for currencies, interest rates, stock indices, agricultural and energy products, precious and base metals and other commodities. The Trust may also engage in futures contracts, forwards, option contracts and other interest in derivative instruments, including swap contracts. The Trust has seven (7) separate and distinct Series of Units issued and outstanding: Frontier Diversified Fund, Frontier Masters Fund, Frontier Long/Short Commodity Fund, Frontier Balanced Fund, Frontier Select Fund, Frontier Global Fund, and Frontier Heritage Fund, (each a “Series” and collectively, the “Series”). The Trust, with respect to the Series, may issue additional Series of Units. The Trust, with respect to each Series: ● engages in the speculative trading of a diversified portfolio of futures, forwards (including interbank foreign currencies), options contracts and other derivative instruments (including swap contracts), and may, from time to time, engage in cash and spot transactions; ● allocates funds to a limited liability trading company or companies (“Trading Company” or “Trading Companies”) and Galaxy Plus (as defined below) entities. Except as otherwise described in these notes, each Trading Company and Galaxy Plus entity has one-year renewable contracts with its own independent commodity trading advisor (s), or each, a Trading Advisor, that will manage all or a portion of such Trading Company’s and Galaxy Plus assets and make the trading decisions for the assets of each Series invested in such Trading Company and Galaxy Plus entity. Each Trading Company and Galaxy Plus entity will segregate its assets from any other Trading Company and Galaxy Plus entity; ● maintains separate, distinct records for each Series, and accounts for the assets of each Series separately from the other Series; ● calculates the Net Asset Value (“NAV”) of its Units for each Series separately from the other Series; ● has an investment objective of increasing the value of each Series’ Units over the long term (capital appreciation), while managing risk and volatility; further, to offer exposure to the investment programs of individual Trading Advisors and to specific instruments; ● maintains each Series of Units in three to seven sub-classes—Class 1, Class 1AP, Class 1a, Class 2, Class 2a, Class 3, and Class 3a. Investors who have purchased Class 1 or Class 1a Units of Frontier Diversified Fund, Frontier Masters Fund, and Frontier Long/Short Commodity Fund are charged a service fee of up to two percent (2.0%) annually of the NAV (of the purchase price, in case of the initial service fee) of each Unit purchased, for the benefit of selling agents selling such Class 1 or Class 1a Units. The initial service fee, which is amortized monthly at an annual rate of up to two percent (2.0%) of the average daily NAV of Class 1 or Class 1a of such Series, is prepaid to the Managing Owner by each Series, and paid to the selling agents by the Managing Owner in the month following sale; provided, however, that investors who redeem all or a portion of their Class 1 or Class 1a Units of any Series during the first twelve (12) months following the effective date of their purchase are subject to a redemption fee of up to two percent (2.0%) of the purchase price at which such investor redeemed to reimburse the Managing Owner for the then-unamortized balance of the prepaid initial service fee. Investors who have purchased Class 1 or Class 1a Units of Frontier Balanced Fund, Frontier Heritage Fund, Frontier Select Fund, and Frontier Global Fund are charged a service fee of up to three percent (3.0%) annually of the NAV (of the purchase price, in case of the initial service fee) of each Unit purchased, for the benefit of selling agents selling such Class 1 or Class 1a Units. The initial service fee, which is amortized monthly at an annual rate of up to three percent (3.0%) of the average daily NAV of Class 1 or Class 1a of such Series, is prepaid to the Managing Owner by each Series, and paid to the selling agents by the Managing Owner in the month following sale. With respect to Class 2 and Class 2a Units of any Series, the Managing Owner pays an ongoing service fee to selling agents of up to one half percent (0.5%) annually of the NAV of each Class 2 or Class 2a Unit (of which 0.25% will be charged to Limited Owners holding Class 2 Units of the Frontier Diversified Fund, and Frontier Masters Fund or Class 2a Units of the Frontier Long/Short Commodity Fund sold until such Class 2 or Class 2a Units which are subject to the fee limitation are reclassified as Class 3 or Class 3a Units of the applicable Series. Class 1AP was created as a sub-class of Class 1 and it has been presented separately because the fees applicable to it are different from those applicable to Class 1. Currently the service fee is not charged to Class 1AP investors. The Managing Owner may also pay selling agents certain additional fees and expenses for administrative and other services rendered and expenses incurred by such selling agents; and ● all payments made to selling agents who are members of the Financial Industry Regulatory Authority, Inc. (“FINRA”) and their associated persons that constitute underwriting compensation will be subject to the limitations set forth in Rule 2310(b)(4)(B)(ii) (formerly Rule 2810(b)(4)(B)(ii)) of the Conduct Rules of FINRA (“Rule 2310”). An investor’s Class 1 Units or Class 2 Units of any Series, or Class 1a Units or Class 2a Units of the Frontier Long/Short Commodity Fund or Frontier Balanced Fund will be classified as Class 3 or Class 3a Units of such Series, as applicable, when the Managing Owner determines that the fee limitation set forth in Rule 2310 with respect to such Units has been reached or will be reached. The service fee limit applicable to each unit sold is reached upon the earlier of when (i) the aggregate initial and ongoing service fees received by the selling agent with respect to such unit equals 9% of the purchase price of such unit or (ii) the aggregate underwriting compensation (determined in accordance with FINRA Rule 2310) paid in respect of such unit totals 10% of the purchase price of such unit. No service fees are paid with respect to Class 3 or Class 3a Units. Units of any Class in a Series may be redeemed, in whole or in part, on a daily basis, at the then current NAV per Unit for such Series on the day of the week after the date the Managing Owner is in receipt of a redemption request for at least one (1) business day to be received by the Managing Owner prior to 4:00 PM in New York. The assets of any particular Series include only those funds and other assets that are paid to, held by or distributed to the Trust, with respect to the Series, on account of and for the benefit of that Series. Under the “Inter-Series Limitation on Liability” expressly provided for under Section 3804(a) of the Trust Act, separate and distinct records of the cash and equivalents, although pooled for maximizing returns, are maintained in the books and records of each Series. As of June 30, 2021, the Trust, with respect to the Frontier Diversified Fund and Frontier Masters Fund, separates Units into three separate Classes—Class 1, Class 2, and Class 3. The Trust, with respect to the Frontier Select Fund, Frontier Global Fund and Frontier Heritage Fund separates Units into a maximum of three separate Classes- Class 1, Class 2 and Class 1AP. The Trust, with respect to the Frontier Balanced Fund separates Units into a maximum of five separate Classes—Class 1, Class 1AP, Class 2, Class 2A and Class 3A. The Trust, with respect to the Frontier Long/Short Commodity Fund separates Units into a maximum of five separate Classes—Class 1A, Class 2A, Class 2, Class 3A and Class 3. Frontier Masters Fund Class 1 was closed as of April 1, 2021. Between April 15, 2016 and May 10, 2017, a portion of the interests in Frontier Trading Company I, LLC and all of the interests in Frontier Trading Company VII, LLC, Frontier Trading Company XV, LLC, and Frontier Trading Company XXIII LLC held by Frontier Diversified Fund, Frontier Masters Fund, Frontier Select Fund, Frontier Balanced Fund and Frontier Long/Short Commodity Fund were exchanged for equivalent interests in the Galaxy Plus Managed Account Platform (“Galaxy Plus”) which is an unaffiliated, third-party managed account platform. The assets of Frontier Trading Company I, LLC, which included exposure to Quantmetrics Capital Management LLP’s Multi-Strategy Program, Quantitative Investment Management, LLC’s Quantitative Global Program, Quest Partners LLC’s Quest Tracker Index Program, Chesapeake Capital Management, LLC’s Diversified Program, and Doherty Advisors LLC’s Relative Value Moderate Program, the assets of Frontier Trading Company VII, LLC, which included exposure to Emil van Essen LLC’s Multi-Strategy Program, Red Oak Commodity Advisors, Inc.’s Fundamental Diversified Program, Rosetta Capital Management, LLC’s Rosetta Trading Program, and Landmark Trading Company’s Landmark Program, the assets of Frontier Trading Company XV, LLC, which included exposure to Transtrend B.V.’s TT Enhanced Risk (USD) Program, and the assets of Frontier Trading Company XXIII, LLC which included exposure to Fort L.P.’s Global Contrarian Program have been transferred to individual Delaware limited liability companies (“Master Funds”) in Galaxy Plus. Each Master Fund is sponsored and operated by Gemini Alternative Funds, LLC (“Sponsor”). The Sponsor has contracted with the Trading Advisors to manage the portfolios of the Master Funds pursuant to the advisors’ respective program. For those Series that invest in Galaxy Plus, approximately 30-70% of those Series assets are used to support the margin requirements of the Master Funds. The remaining assets of the Series are split between investments in Trading Companies and a pooled cash management account that invests primarily in U.S. Treasury securities. All the funds are invested in Galaxy Plus entities. Each of the Series has invested a portion of its assets in several different Trading Companies or Galaxy Plus entities and one or more Trading Advisors may manage the assets invested in such Trading Companies or Galaxy Plus entities. The Trust has entered into agreements, which provide for the indemnification of futures clearing brokers, currency trading companies, and commodity trading advisers, among others, against losses, costs, claims and liabilities arising from the performance of their individual obligations under such agreements, except for gross negligence, bad faith or willful misconduct.
Frontier Funds [Member]
Organization and Purpose [Line Items]
Organization and Purpose	1. Organization and Purpose Frontier Funds, which is referred to in this report as the “Trust”, was formed on August 8, 2003, as a Delaware statutory trust and is set to expire on December 31, 2053. The Trust is a multi-advisor commodity pool, as described in in CFTC Regulation § 4.10(d)(2). The Trust has authority to issue separate Series of Units pursuant to the requirements of the Trust Act. The assets of each Series are valued and accounted for separately from the assets of other Series. The Trust is not registered as an investment company under the Investment Company Act. It is managed by the Managing Owner. Purchasers of Units are Limited Owners of the Trust with respect to beneficial interests of the Series’ Units purchased. The Trust Act provides that, except as otherwise provided in the second amended and restated declaration of trust and trust agreement dated December 9, 2013, as further amended, by and among the Managing Owner, Wilmington Trust Company as trustee and the unitholders, as amended from time to time (the “Trust Agreement”), unitholders of the Trust will have the same limitation of liability as do stockholders of private corporations organized under the General Corporation Law of the State of Delaware. The Trust Agreement confers substantially the same limited liability, and contains the same limited exceptions thereto, as would a limited partnership agreement for a Delaware limited partnership engaged in like transactions as the Trust. In addition, pursuant to the Trust Agreement, the Managing Owner of the Trust is liable for obligations of a Series in excess of that Series’ assets. Limited Owners do not have any such liability. The Managing Owner will make contributions to the Series of the Trust necessary to maintain at least a 1% interest in the aggregate capital, profits and losses of all Series. The Trust has been organized to pool investor funds for the purpose of trading in the U.S. and international markets for currencies, interest rates, stock indices, agricultural and energy products, precious and base metals and other commodities. The Trust may also engage in futures contracts, forwards, option contracts and other interest in derivative instruments, including swap contracts. The Trust has seven (7) separate and distinct Series of Units issued and outstanding: Frontier Diversified Fund, Frontier Masters Fund, Frontier Long/Short Commodity Fund, Frontier Balanced Fund, Frontier Select Fund, Frontier Global Fund, and Frontier Heritage Fund. The Trust financial statements are comprised of unitized Series which are consolidated into the Trust financial statements. However, the consolidated Trust does not issue units. The Trust, with respect to each Series: ● engages in the speculative trading of a diversified portfolio of futures, forwards (including interbank foreign currencies), options contracts and other derivative instruments (including swap contracts), and may, from time to time, engage in cash and spot transactions; ● allocates funds to a limited liability trading company or companies (“Trading Company” or “Trading Companies”) and Galaxy Plus (as defined below) entities. Except as otherwise described in these notes, each Trading Company and Galaxy Plus entity has one-year renewable contracts with its own independent commodity trading advisor (s), or each, a Trading Advisor, that will manage all or a portion of such Trading Company’s and Galaxy Plus assets and make the trading decisions for the assets of each Series invested in such Trading Company and Galaxy Plus entity. Each Trading Company and Galaxy Plus entity will segregate its assets from any other Trading Company and Galaxy Plus entity. ● maintains separate, distinct records for each Series, and accounts for the assets of each Series separately from the other Series; ● calculates the Net Asset Value (“NAV”) of its Units for each Series separately from the other Series; ● has an investment objective of increasing the value of each Series’ Units over the long term (capital appreciation), while managing risk and volatility; further, to offer exposure to the investment programs of individual Trading Advisors and to specific instruments; ● maintains each Series of Units in three to seven sub-classes—Class 1, Class 1AP, Class 1a, Class 2, Class 2a, Class 3, and Class 3a. Investors who have purchased Class 1 or Class 1a Units of Frontier Diversified Fund, Frontier Masters Fund, and Frontier Long/Short Commodity Fund are charged a service fee of up to two percent (2.0%) annually of the NAV (of the purchase price, in case of the initial service fee) of each Unit purchased, for the benefit of selling agents selling such Class 1 or Class 1a Units. The initial service fee, which is amortized monthly at an annual rate of up to two percent (2.0%) of the average daily NAV of Class 1 or Class 1a of such Series, is prepaid to the Managing Owner by each Series, and paid to the selling agents by the Managing Owner in the month following sale; provided, however, that investors who redeem all or a portion of their Class 1 or Class 1a Units of any Series during the first twelve(12) months following the effective date of their purchase are subject to a redemption fee of up to two percent (2.0%) of the purchase price at which such investor redeemed to reimburse the Managing Owner for the then-unamortized balance of the prepaid initial service fee. Investors who have purchased Class 1 or Class 1a Units of Frontier Balanced Fund, Frontier Heritage Fund, Frontier Select Fund, and Frontier Global Fund are charged a service fee of up to three percent (3.0%) annually of the NAV (of the purchase price, in case of the initial service fee) of each Unit purchased, for the benefit of selling agents selling such Class 1 or Class 1a Units. The initial service fee, which is amortized monthly at an annual rate of up to three percent (3.0%) of the average daily NAV of Class 1 or Class 1a of such Series, is prepaid to the Managing Owner by each Series, and paid to the selling agents by the Managing Owner in the month following sale. With respect to Class 2 and Class 2a Units of any Series, the Managing Owner pays an ongoing service fee to selling agents of up to one half percent (0.5%) annually of the NAV of each Class 2 or Class 2a Unit (of which 0.25% will be charged to Limited Owners holding Class 2 Units of the Frontier Diversified Fund, and Frontier Masters Fund or Class 2a Units of the Frontier Long/Short Commodity Fund sold until such Class 2 or Class 2a Units which are subject to the fee limitation are reclassified as Class 3 or Class 3a Units of the applicable Series. Class 1AP was created as a sub-class of Class 1 and it has been presented separately because the fees applicable to it are different from those applicable to Class 1. Currently the service fee is not charged to Class 1AP investors. The Managing Owner may also pay selling agents certain additional fees and expenses for administrative and other services rendered and expenses incurred by such selling agents; and ● all payments made to selling agents who are members of the Financial Industry Regulatory Authority, Inc. (“FINRA”) and their associated persons that constitute underwriting compensation will be subject to the limitations set forth in Rule 2310(b)(4)(B)(ii) (formerly Rule 2810(b)(4)(B)(ii)) of the Conduct Rules of FINRA (“Rule 2310”). An investor’s Class 1 Units or Class 2 Units of any Series, or Class 1a Units or Class 2a Units of the Frontier Long/Short Commodity Fund or Frontier Balanced Fund will be classified as Class 3 or Class 3a Units of such Series, as applicable, when the Managing Owner determines that the fee limitation set forth in Rule 2310 with respect to such Units has been reached or will be reached. The service fee limit applicable to each unit sold is reached upon the earlier of when (i) the aggregate initial and ongoing service fees received by the selling agent with respect to such unit equals 9% of the purchase price of such unit or (ii) the aggregate underwriting compensation (determined in accordance with FINRA Rule 2310) paid in respect of such unit totals 10% of the purchase price of such unit. No service fees are paid with respect to Class 3 or Class 3a Units. Units of any Class in a Series may be redeemed, in whole or in part, on a daily basis, at the then current NAV per Unit for such Series on the day of the week after the date the Managing Owner is in receipt of a redemption request for at least one (1) business day to be received by the Managing Owner prior to 4:00 PM in New York. Frontier Masters Fund Class 1 was closed as of April 1, 2021. The assets of any particular Series include only those funds and other assets that are paid to, held by or distributed to the Trust on account of and for the benefit of that Series. Under the “Inter-Series Limitation on Liability” expressly provided for under Section 3804(a) of the Trust Act, separate and distinct records of the cash and equivalents, although pooled for maximizing returns, are maintained in the books and records of each Series. As of June 30, 2021, the Trust, with respect to the Frontier Diversified Fund and Frontier Masters Fund, separates Units into three separate Classes—Class 1, Class 2, and Class 3. The Trust, with respect to the Frontier Select Fund, Frontier Global Fund and Frontier Heritage Fund separates Units into a maximum of three separate Classes—Class 1, Class 2 and Class 1AP. The Trust, with respect to the Frontier Balanced Fund separates Units into a maximum of five separate Classes—Class 1, Class 1AP, Class 2, Class 2A and Class 3A. The Trust, with respect to the Frontier Long/Short Commodity Fund separates Units into a maximum of five separate Classes—Class 1A, Class 2A, Class 2, Class 3A and Class 3. Between April 15, 2016 and May 10, 2017, a portion of the interests in Frontier Trading Company I, LLC and all of the interests in Frontier Trading Company VII, LLC, Frontier Trading Company XV, LLC, and Frontier Trading Company XXIII LLC held by Frontier Diversified Fund, Frontier Masters Fund, Frontier Select Fund, Frontier Balanced Fund and Frontier Long/Short Commodity Fund were exchanged for equivalent interests in the Galaxy Plus Managed Account Platform (“Galaxy Plus”) which is an unaffiliated, third-party managed account platform. The assets of Frontier Trading Company I, LLC, which included exposure to Quantmetrics Capital Management LLP’s Multi-Strategy Program, Quantitative Investment Management, LLC’s Quantitative Global Program, Quest Partners LLC’s Quest Tracker Index Program, Chesapeake Capital Management, LLC’s Diversified Program, and Doherty Advisors LLC’s Relative Value Moderate Program, the assets of Frontier Trading Company VII, LLC, which included exposure to Emil van Essen LLC’s Multi-Strategy Program, Red Oak Commodity Advisors, Inc.’s Fundamental Diversified Program, Rosetta Capital Management, LLC’s Rosetta Trading Program, and Landmark Trading Company’s Landmark Program, the assets of Frontier Trading Company XV, LLC, which included exposure to Transtrend B.V.’s TT Enhanced Risk (USD) Program, and the assets of Frontier Trading Company XXIII, LLC which included exposure to Fort L.P.’s Global Contrarian Program have been transferred to individual Delaware limited liability companies (“Master Funds”) in Galaxy Plus. Each Master Fund is sponsored and operated by Gemini Alternative Funds, LLC (“Sponsor”). The Sponsor has contracted with the Trading Advisors to manage the portfolios of the Master Funds pursuant to the advisors’ respective program. For those Series that invest in Galaxy Plus, approximately 30-70% of those Series assets are used to support the margin requirements of the Master Funds. The remaining assets of the Series are split between investments in Trading Companies and a pooled cash management account that invests primarily in U.S. Treasury securities. For those Series that do not invest in Galaxy Plus, their assets are split between investments in Trading Companies and investments in the pooled cash management account. Each of the Series has invested a portion of its assets in several different Trading Companies or Galaxy Plus entities and one or more Trading Advisors may manage the assets invested in such Trading Companies or Galaxy Plus entities. The Trust has entered into agreements, which provide for the indemnification of futures clearing brokers, currency trading companies, and commodity trading advisers, among others, against losses, costs, claims and liabilities arising from the performance of their individual obligations under such agreements, except for gross negligence, bad faith or willful misconduct.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Significant Accounting Policies [Line Items]
Significant Accounting Policies	2. Significant Accounting Policies The following are the significant accounting policies of the Series of the Trust. Basis of Presentation Consolidation Galaxy Plus entities are co-mingled investment vehicles. In addition to the Series, there are other non-affiliated investors in Galaxy Plus entities. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Series’ ownership percentage in Galaxy Plus entities. It is expected that ownership percentage will fluctuate (sometimes significantly) on a week by week basis which could also result in frequent changes in the consolidating Series. Such fluctuations make consolidating the financial statements of the Galaxy Plus entities both impractical and misleading. Non-consolidation of these Galaxy Plus entities presents a more useful financial statement for the readers. As such, management has decided that presenting Galaxy Plus entities on a non-consolidated basis as investments in other investments companies (a “fund of funds” approach) is appropriate and preferable to the users of these financial statements. Refer to Note 5 for additional disclosures related to these private investment companies. Use of Estimates— Cash and Cash Equivalents— Interest Income U U.S. Treasury Securities— Fair Value Measurements and Disclosures (“ Receivable From Futures Commission Merchants Investment Transactions— Balance Sheet (“ASC 210” Balance Sheet (Topic 210 Any change in net unrealized gain or loss from the preceding period is reported in the statements of operations. Fair value of exchange-traded contracts is based upon exchange settlement prices. Fair value of non-exchange-traded contracts is based on third party quoted dealer values on the interbank market. For U.S. Treasury securities, interest is recognized in the period earned and the instruments are marked-to-market daily based on third party information. Transaction costs are recognized as incurred and reflected separately in the statements of operations. Purchase and Sales of Private Investment Companies Foreign Currency Transactions— Allocation of Earnings— Each Series allocates funds to an affiliated Trading Company, or Companies, of the Trust or unaffiliated Galaxy Plus entity. Each Trading Company allocates all of its daily trading gains or losses to the Series in proportion to each Series’ ownership trading level interest in the Trading Company, adjusted on a daily basis (except for Trading Advisors and other investments such as swaps that are directly allocated to a specific Series). Likewise, trading gains and losses earned and incurred by the Series through their investments in Galaxy Plus entities are allocated to those Series on a daily basis. The allocation of gains and losses in Galaxy Plus entities are based on each Series pro-rata shares of the trading level of that entity which is updated at the beginning of each month or more frequently if there is a subscription or redemption activity in the entity. The value of all open contracts and cash held at clearing brokers is similarly allocated to the Series in proportion to each Series’ funds allocated to the Trading Companies or Galaxy Plus entities. Investments and Swaps Income Taxes Income Taxes The 2017 through 2020 tax years generally remain subject to examination by U.S. federal and most state tax authorities. In the opinion of the Managing Owner, (i) the Trust, with respect to the Series, is treated as a partnership for federal income tax purposes and, assuming that at least 90% of the gross income of the Trust constitutes “qualifying income” within the meaning of Section 7704(d) of the Code, (ii) the Trust is not a publicly traded partnership treated as a corporation, and (iii) the discussion set forth in the Prospectus under the heading “U.S. Federal Income Tax Consequences” correctly summarizes the material federal income tax consequences as of the date of the Prospectus to potential U.S. Limited Owners of the purchase, ownership and disposition of Units of the Trust. Fees and Expenses Incentive Fee (rebate) Service Fees Each Series is charged service fees as outlined above. In some cases, amounts paid to selling agents might be less than the amount charged to the Series. When this occurs, the service fee is rebated back to the investor in the form of additional units. During 2018, 2019 and 2020 the Series were not allowed to issue additional units. The Managing Owner has determined that the purchase of additional units of the relevant Series will commence in 2021 when the Series are allowed to sell shares again. As such, the Managing Owner has calculated the amounts for additional units of the relevant series which will be purchased and classified such amounts as Subscriptions in advance for service fee rebates of $22,650, $392, $31,725, $358,273, $20,378, $156,772 and $66,429 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively, as of June 30, 2021. These service fees are part of the offering costs of the Trust, with respect to the Series, which include registration and filing fees, legal and blue sky expenses, accounting and audit, printing, marketing support and other offering costs which are borne by the Managing Owner. With respect to the service fees, the initial service fee (for the first 12 months) relating to a purchase of Class 1 and Class 1a Units by an investor is prepaid by the Managing Owner to the relevant selling agent in the month following such purchase and is reimbursed for such payment by the Series monthly in arrears in an amount based upon a corresponding percentage of NAV, calculated daily. Consequently, the Managing Owner bears the risk of the downside and enjoys the benefit of the upside potential of any difference between the amount of the initial service fee prepaid by it and the amount of the reimbursement thereof, which may result from variations in NAV over the following 12 months. Pending Owner Additions— Owner redemptions payable— Recently Adopted Accounting Pronouncements— Subsequent Events—The Series follow the provisions of ASC 855, Subsequent Events
Frontier Funds [Member]
Significant Accounting Policies [Line Items]
Significant Accounting Policies	2. Significant Accounting Policies The following are the significant accounting policies of the Trust. Basis of Presentation Consolidation The income or loss attributable thereto in proportion of investment level is shown in the statements of operations as change in fair value of investments in unconsolidated Trading Companies or net unrealized gain/(loss) on private investment companies. The Trading Companies and Series of the Trust are consolidated by the Trust. All intercompany transactions have been eliminated in consolidation. Galaxy Plus entities are co-mingled investment vehicles. In addition to the Trust, there are other non-affiliated investors in Galaxy Plus entities. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Trust’s ownership percentage in Galaxy Plus entities. It is expected that ownership percentage will fluctuate (sometimes significantly) on a week by week basis which could also result in frequent changes in the consolidating Series. Such fluctuations make consolidating the financial statements of the Galaxy Plus entities both impractical and misleading. Non-consolidation of these Galaxy Plus entities presents a more useful financial statement for the readers. As such, management has decided that presenting Galaxy Plus entities on a non-consolidated basis as investments in other investments companies (a “fund of funds” approach) is appropriate and preferable to the users of these financial statements. Refer to Note 5 for additional disclosures related to these private investment companies. Use of Estimates— Cash and Cash Equivalents— Interest Income U.S. Treasury Securities— Fair Value Measurements and Disclosures (“ Receivable from Futures Commission Merchants Investment Transactions—Futures, options on futures, forward and swap contracts are recorded on a trade date basis and realized gains or losses are recognized when contracts are settled. Unrealized gains or losses on open contracts (the difference between contract trade price and market price) are reported in the consolidated statements of financial condition as a net unrealized gain or loss, as there exists a right of offset of unrealized gains or losses in accordance with FASB ASC 210, Balance Sheet (“ASC 210” Balance Sheet (Topic 210 Any change in net unrealized gain or loss from the preceding period is reported in the consolidated statements of operations. Fair value of exchange-traded contracts is based upon exchange settlement prices. Fair value of non-exchange-traded contracts is based on third party quoted dealer values on the interbank market. For U.S. Treasury securities, interest was recognized in the period earned and the instruments were marked-to-market daily based on third party information. Transaction costs are recognized as incurred and reflected separately in the consolidated statements of operations. Purchase and Sales of Private Investment Companies Foreign Currency Transactions— Allocation of Earnings— Each Series allocates funds to an affiliated Trading Company, or Companies, of the Trust, or unaffiliated Galaxy Plus entity. Each Trading Company allocates all of its daily trading gains or losses to the Series in proportion to each Series’ ownership trading level interest in the Trading Company, adjusted on a daily basis (except for Trading Advisors and other investments such as swaps that are directly allocated to a specific series). Likewise, trading gains and losses earned and incurred by the Series through their investments in Galaxy Plus entities are allocated to those Series on a daily basis. The allocation of gains and losses in Galaxy Plus entities are based on each Series pro-rata shares of the trading level of that entity which is updated at the beginning of each month or more frequently if there is a subscription or redemption activity in the entity. The value of all open contracts and cash held at clearing brokers is similarly allocated to the Series in proportion to each Series’ funds allocated to the Trading Companies or Galaxy Plus entities. Investments and Swaps— Income Taxes In the opinion of the Managing Owner, (i) the Trust is treated as a partnership for Federal income tax purposes and, assuming that at least 90% of the gross income of the Trust constitutes “qualifying income” within the meaning of Section 7704(d) of the Code, (ii) the Trust is not a publicly traded partnership treated as a corporation, and (iii) the discussion set forth in the Prospectus under the heading “U.S. Federal Income Tax Consequences” correctly summarizes the material Federal income tax consequences as of the date of the Prospectus to potential U.S. Limited Owners of the purchase, ownership and disposition of Series Units of the Trust. Fees and Expenses— Incentive Fee (rebate)— Service Fees Each Series is charged service fees as outlined above. In some cases, amounts paid to selling agents might be less than the amount charged to the Series. When this occurs, the service fee is rebated back to the investor in the form of additional units. During 2020, 2019 and 2018, the Series were not allowed to issue additional units. The Managing Owner has determined that the purchase of additional units of the relevant Series will commence in 2021 when the Series are allowed to sell shares again. As such, the Managing Owner has calculated the amounts for additional units of the relevant series which will be purchased and classified such amounts as Subscriptions in advance for service fee rebates of $656,619 and $638,962 as of June 30, 2021 and December 31, 2020, respectively. These service fees are part of the offering costs of the Trust, which include registration and filing fees, legal and blue1 sky expenses, accounting and audit, printing, marketing support and other offering costs which are borne by the Managing Owner. With respect to the service fees, the initial service fee (for the first 12 months) relating to a purchase of Class 1 and Class 1a Units by an investor is prepaid by the Managing Owner to the relevant selling agent in the month following such purchase and is reimbursed for such payment by the Series monthly in arrears in an amount based upon a corresponding percentage of NAV, calculated daily. Consequently, the Managing Owner bears the risk of the downside and enjoys the benefit of the upside potential of any difference between the amount of the initial service fee prepaid by it and the amount of the reimbursement thereof, which may result from variations in NAV over the following 12 months. Pending Owner Additions— Owner redemptions payable— Recently Adopted Accounting Pronouncements— Subsequent Events Subsequent Events

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Fair Value Measurements [Line Items]
Fair Value Measurements	3. Fair Value Measurements In connection with the valuation of investments the Series apply ASC 820. ASC 820 provides clarification that when a quoted price in an active market for the identical asset or liability is not available, a reporting entity is required to measure fair value using certain techniques. ASC 820 also clarifies that when estimating the fair value of an asset or liability, a reporting entity is not required to include a separate input or adjustment to other inputs relating to the existence of a restriction that prevents the transfer of an asset or liability. ASC 820 also clarifies that both a quoted price in an active market for the identical asset or liability at the measurement date and the quoted price for the identical asset or liability when traded as an asset in an active market when no adjustments to the quoted price of the asset are required are Level 1 fair value measurements. Level 1 Inputs Unadjusted quoted prices in active markets for identical financial assets that the reporting entity has the ability to access at the measurement date. Level 2 Inputs Inputs other than quoted prices included in Level 1 that are observable for the financial assets or liabilities, either directly or indirectly. These might include quoted prices for similar financial assets in active markets, quoted prices for identical or similar financial assets in markets that are not active, inputs other than quoted prices that are observable for the financial assets or inputs that are derived principally from or corroborated by market data by correlation or other means. Level 3 Inputs Unobservable inputs for determining the fair value of financial assets that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the financial asset. The Trust, with respect to the Series, uses the following methodologies to value instruments within its financial asset portfolio at fair value: Trading Securities Swap Contracts. Swap contracts are reported at fair value. Valuation reports are generated and disseminated daily from the swap counterparty to the third-party administrator. The fair value is applied by the third-party administrator to calculate the daily performance. The Managing Owner reviews the third-party administrator performance reports and any noticeable exceptions are investigated. Unexplained exceptions are escalated to the Managing Owner’s Valuation Committee for further evaluation and resolution. Swap contracts are reported at fair value using Level 3 inputs. For the quarter ended June 30, 2021, the Trust did not have any total return swap investments. Investment in Unconsolidated Trading Companies Investments in Private Investment Companies The following table summarizes investment in each Series measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value. June 30, 2021 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies $ 16,682 $ - $ - $ 16,682 U.S. Treasury Securities 186,482 - - 186,482 Frontier Masters Fund Investment in Unconsolidated Trading Companies 5,846 - - 5,846 U.S. Treasury Securities 65,347 - - 65,347 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 10,331 - - 10,331 U.S. Treasury Securities 115,492 - - 115,492 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 78,686 - - 78,686 Open Trade Equity (Deficit) (71,432 ) - - (71,432 ) U.S. Treasury Securities 879,612 - - 879,612 Frontier Select Fund Investment in Unconsolidated Trading Companies 3,273 - - 3,273 U.S. Treasury Securities 36,588 - - 36,588 Frontier Global Fund Investment in Unconsolidated Trading Companies 8,406 - - 8,406 U.S. Treasury Securities 93,971 - - 93,971 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 10,083 - - 10,083 U.S. Treasury Securities 112,721 - - 112,721 December 31, 2020 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies $ 16,669 $ - $ - $ 16,669 U.S. Treasury Securities 427,393 - - 427,393 Frontier Masters Fund Investment in Unconsolidated Trading Companies 907 - - 907 U.S. Treasury Securities 23,245 - - 23,245 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 17,736 - - 17,736 U.S. Treasury Securities 454,738 - - 454,738 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 49,755 - - 49,755 Open Trade Equity (Deficit) 100,440 - - 100,440 U.S. Treasury Securities 1,275,641 - - 1,275,641 Frontier Global Fund Investment in Unconsolidated Trading Companies 1,083 - - 1,083 U.S. Treasury Securities 27,742 - - 27,742 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 2,880 - - 2,880 U.S. Treasury Securities 73,847 - - 73,847 The changes in Level 3 assets measured at fair value on a recurring basis are summarized in the following tables. Swap contract asset gains and losses included in earnings are classified in “realized and unrealized gain (loss) on investments – net unrealized gain/(loss) on swap contracts” on the statements of operations. Investment in unconsolidated trading company asset gains and losses (realized/unrealized) included in earnings are classified in “Change in fair value of investments in unconsolidated trading companies”. During year ended December 2020, all identified Level 3 assets were components of the Frontier Diversified Fund, Frontier Long/Short Commodity Fund, Frontier Balanced Fund, Frontier Select Fund, and Frontier Heritage Fund. During the year ended December 31, 2020, the entire investments in the swaps were sold. For the Year Ended December 31, 2020 Swaps Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2020 $ 11,944,753 $ 362,521 Total gains or losses (realized/unrealized): Included in earnings-realized (2,448,166 ) 188,100 Included in earnings-unrealized (3,088,917 ) 44,277 Proceeds from collateral reduction (6,176,555 ) (115,000 ) Sale of investments (7,586,366 ) (594,898 ) Purchase of investments 7,355,251 115,000 Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2020 $ - $ - Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2020 $ 6,384,583 $ 2,888,009 Total gains or losses (realized/unrealized): Included in earnings-realized (446,306 ) (97,745 ) Included in earnings-unrealized (1,537,399 ) 197,829 Proceeds from collateral reduction (4,000,000 ) (2,474,937 ) Sale of investments (4,870,025 ) (1,491,965 ) Purchase of investments 4,469,147 978,809 Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2020 $ - $ - Investments in Unconsolidated Trading Companies Frontier Balance of recurring Level 3 assets as of January 1, 2020 $ 479,024 Change in fair value of investments in unconsolidated trading companies 95,915 Proceeds from sales of investments of unconsolidated trading companies (574,939 ) Purchases of investments of unconsolidated trading companies - Change in ownership allocation - Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2020 $ - The Series of the Trust assess the levels of the investments at each measurement date, and transfers between levels are recognized on the actual date of the event or change in circumstances that caused the transfer in accordance with the Series’ accounting policy regarding the recognition of transfers between levels of the fair value hierarchy. During the six months ended June 30, 2021, the Trust did not transfer any assets between Levels 1, 2 or 3. The amounts reflected in the change in ownership allocation result from changes in ownership in the underlying Trading Companies at the Series level, which have resulted in changes in consolidation or de-consolidation by the Series. The ownership in the Trading Companies is accounted for under the equity method, which approximates fair value. The Frontier Heritage Fund and the Frontier Select Fund jointly owned the Frontier Brevan Howard swap. The Frontier Heritage Fund owned the majority interest in the Frontier Brevan Howard swap. The Frontier Select Fund (through its investment in an unconsolidated trading company) and Frontier Heritage Fund Brevan Howard swap investments were liquidated on May 30, 2020 and Frontier Balanced Fund, Frontier Long/Short Commodity Fund, Frontier Diversified Fund TRS swap investments were liquidated on December 21, 2020. The total change in unrealized appreciation (depreciation) included in the statements of operations attributable to level 3 investments still held at December 31, 2020. Frontier Frontier Frontier Frontier Swap Contracts $ (1,537,399 ) $ 44,277 $ (3,088,917 ) $ 197,829 Frontier Investments in Unconsolidated Trading Companies $ (91,989 )
Frontier Funds [Member]
Fair Value Measurements [Line Items]
Fair Value Measurements	3. Fair Value Measurements In connection with the valuation of investments the Trust applies ASC 820, Fair Value Measurement (“ASC 820”) Level 1 Inputs Unadjusted quoted prices in active markets for identical financial assets that the reporting entity has the ability to access at the measurement date. Level 2 Inputs Inputs other than quoted prices included in Level 1 that are observable for the financial assets or liabilities, either directly or indirectly. These might include quoted prices for similar financial assets in active markets, quoted prices for identical or similar financial assets in markets that are not active, inputs other than quoted prices that are observable for the financial assets or inputs that are derived principally from or corroborated by market data by correlation or other means. Level 3 Inputs Unobservable inputs for determining the fair value of financial assets that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the financial asset. The Trust uses the following methodologies to value instruments within its financial asset portfolio at fair value: Trading Securities. Swap Contracts. Investments in Private Investment Companies The following table summarizes the instruments that comprise the Trust’s financial asset portfolio, in aggregate, measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value: June 30, 2021 Level 1 Inputs Level 2 Level 3 Total Open Trade Equity (Deficit) $ (71,432 ) $ - $ - $ (71,432 ) U.S. Treasury Securities 1,490,213 - - 1,490,213 December 31, 2020 Level 1 Inputs Level 2 Level 3 Total Open Trade Equity $ 100,440 $ - $ - $ 100,440 U.S. Treasury Securities 2,282,606 - - 2,282,606 The changes in Level 3 assets measured at fair value on a recurring basis are summarized in the following tables. Swap contract asset gains and losses (realized/unrealized) included in earnings are classified in “realized and unrealized gain (loss) on investments – net unrealized gain/(loss) on swap contracts” on the statements of operations. Swaps For the Balance of recurring Level 3 assets as of January 1, 2020 $ 21,579,865 Total gains or losses (realized/unrealized): Included in earnings-realized (2,896,106 ) Included in earnings-unrealized (4,384,210 ) Proceeds from collateral reduction (12,674,502 ) Purchase of investments 12,918,207 Sale of investments (14,543,254 ) Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2020 $ - The Trust assesses the levels of the investments at each measurement date, and transfers between levels are recognized on the actual date of the event or change in circumstances that caused the transfer in accordance with the Trust’s accounting policy regarding the recognition of transfers between levels of the fair value hierarchy. During the six months ended June 30, 2021 and December 31, 2020, the Trust did not transfer any assets between Levels 1, 2 and 3. The total change in unrealized appreciation (depreciation) included in the statements of operations attributable to level 3 investments still held at December 31, 2020: Swaps $(4,384,210).

Swap Contracts

Swap Contracts	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Swap Contracts [Line Items]
Swap Contracts	4. Swap Contracts In addition to authorizing Trading Advisors to manage predetermined investment levels of futures, option on futures and forward contracts, certain Series of the Trust will strategically invest a portion or all of their assets in total return swaps, selected at the direction of the Managing Owner. Total return swaps are privately negotiated contracts designed to provide investment returns linked to those produced by one or more investment products or indices. In a typical total return swap, two parties agree to exchange the returns (or differentials in rates of return) earned or realized on one or more particular predetermined investments or instruments. The gross returns to be exchanged or “swapped” between the parties are calculated with respect to a “notional amount” (i.e., the amount or value of the underlying asset used in computing the particular interest rate, return, or other amount to be exchanged) in a particular investment, or in a “basket” of securities. Each Series’ investment in swaps will likely differ substantially over time due to cash flows, portfolio management decisions and market movements. The swaps serve to diversify the investment holdings of each Series and to provide access to programs and advisors that would not be otherwise available to the Series, and are not used for hedging purposes. The Managing Owner follows a procedure in selecting well-established financial institutions which the Managing Owner, in its sole discretion, considers to be reputable, reliable, financially responsible and well established to act as swap counterparties. The procedure includes due diligence review of documentation on all new and existing financial institution counterparties prior to initiation of the relationship, and quarterly ongoing review during the relationship, to ensure that counterparties meet the Managing Owner’s minimum credit requirements, the counterparty average rating being no less than an investment grade rating as defined by the rating agencies. As of December 31, 2020, none of the Trust’s assets were deposited with over-the-counter counterparties in order to initiate and maintain swaps and is recorded as collateral within the swap fair value within the Statements of Financial Condition. The cash held with the counterparty is not restricted. The Series may strategically invest assets in one or more swaps linked to certain underlying investments or indices at the direction of the Managing Owner. The Trading Company in which the assets of these Series will be invested will not own any of the investments or indices referenced by any swap entered into by these Series. In addition, neither the swap counterparty to the Trading Company of these Series nor any advisor referenced by any such swap is a Trading Advisor to these Series. To help to reduce counterparty risk on the Series, the Managing Owner has the right to reduce the Series’ exposure and remove cash from the Series’ total return swaps with Deutsche Bank AG. This cash holding shall be in excess of $250,000 and may not exceed 40% of the index exposure in total. Index exposure is defined as the total notional amount plus any profit. The Series are charged interest on this cash holding and any amount removed will be offset against the final settlement value of the swap. The Frontier Select Fund (through its investment in an unconsolidated trading company) and Frontier Heritage Fund Brevan Howard swap investments were liquidated on May 30, 2020 and Frontier Balanced Fund, Frontier Long/Short Commodity Fund, Frontier Diversified Fund TRS swap investments were liquidated on December 21, 2020. The Series have invested in the following swaps as of and for the year ended December 31, 2020: Frontier Frontier Frontier Frontier Total Total Total Total Counterparty Deutsche Deutsche Deutsche Deutsche Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 $ (97,745 ) Change in Unrealized Gain/(Loss) $ (3,088,917 ) $ (1,537,399 ) $ 44,277 $ 197,829 Fair Value as of December 31, 2020 $ 0 $ 0 $ 0 $ 0 Advance on swap appreciation $ 0 $ 0 $ 0 $ 0
Frontier Funds [Member]
Swap Contracts [Line Items]
Swap Contracts	4. Swap Contracts In addition to authorizing Trading Advisors to manage predetermined investment levels of futures and forward contracts, certain Series of the Trust will strategically invest a portion or all of their assets in total return swaps, selected at the direction of the Managing Owner. Total return swaps are privately negotiated contracts designed to provide investment returns linked to those produced by one or more investment products or indices. In a typical total return swap, two parties agree to exchange the returns (or differentials in rates of return) earned or realized on one or more particular predetermined investments or instruments. The gross returns to be exchanged or “swapped” between the parties are calculated with respect to a “notional amount” (i.e., the amount or value of the underlying asset used in computing the particular interest rate, return, or other amount to be exchanged) in a particular investment, or in a “basket” of securities. The Trust’s investment in swaps will likely differ substantially over time due to cash flows, portfolio management decisions and market movements. The swaps serve to diversify the investment holdings of the Trust and to provide access to programs and advisors that would not be otherwise available to the Trust and are not used for hedging purposes. The Managing Owner follows a procedure in selecting well-established financial institutions which the Managing Owner, in its sole discretion, considers to be reputable, reliable, financially responsible and well established to act as swap counterparties. The procedure includes due diligence review of documentation on all new and existing financial institution counterparties prior to initiation of the relationship, and quarterly ongoing review during the relationship, to ensure that counterparties meet the Managing Owner’s minimum credit requirements, the counterparty average rating being no less than an investment grade rating as defined by the rating agencies. As of December 31, 2020, all swaps were sold so that no Trust’s assets were deposited with over-the-counter counterparties. The Trust strategically invests assets in one or more swaps linked to certain underlying investments or indices at the direction of the Managing Owner. The Trading Company in which the assets of the Trust will be invested will not own any of the investments or indices referenced by any swap entered into by the Trust. In addition, neither the swap counterparty nor any advisor referenced by any such swap is a Trading Advisor to the Trust. To help to reduce counterparty risk on the Series, the Managing Owner has the right to reduce the Series’ exposure and remove cash from the Series’ total return swaps with Deutsche Bank AG. This cash holding shall be in excess of $250,000 and may not exceed 40% of the index exposure in total. Index exposure is defined as the total notional amount plus any profit. The Series are charged interest on this cash holding and any amount removed will be offset against the final settlement value of the swap. The Frontier Select Fund (through its investment in an unconsolidated trading company) and Frontier Heritage Fund Brevan Howard swap investments were liquidated on May 30, 2020 and Frontier Balanced Fund, Frontier Long/Short Commodity Fund, Frontier Diversified Fund TRS swap investment were liquidated on December 21, 2020. The Trust had invested in the following swaps as of and for the year ended December 31, 2020: XXXIV Balanced select swap XXXV Diversified select swap XXXVII L/S select swap Brevan Howard Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 $ (189,734 ) Change in Unrealized Gain/(Loss) $ (3,088,917 ) $ (1,537,399 ) $ 44,277 $ 197,829 Fair Value as of December 31, 2020 $ 0 $ 0 $ 0 $ 0 Advance on swap appreciation $ 0 $ 0 $ 0 $ 0

Investments in Unconsolidated T

Investments in Unconsolidated Trading Companies and Private Investment Companies	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies [Line Items]
Investments in Unconsolidated Trading Companies and Private Investment Companies	5. Investments in Unconsolidated Trading Companies and Private Investment Companies Investments in unconsolidated Trading Companies and private investment companies represent cash and open trade equity invested in the Trading Companies and private investment companies and cumulative trading profits or losses allocated to each Series by the Trading Companies and private investment companies. Trading Companies and private investment companies allocate trading profits or losses on the basis of the proportion of each Series’ capital allocated for trading to each respective Trading Company, which bears no relationship to the amount of cash invested by a Series in the Trading Company and private investment companies. The Trading Companies are valued using the equity method of accounting, which approximates fair value. Investments in private investment companies are valued using the NAV provided by the underlying private investment. The Galaxy Plus entities are made up a feeder funds in which the Series invest and master trading entities into which the feeder funds invest. No investment held by the Galaxy Plus master trading entity is greater than 5% of the Series’ total capital. The following table summarizes each of the Series’ investments in unconsolidated Trading Companies as of June 30, 2021 and December 31, 2020: As of June 30, 2021 As of December 31, 2020 Percentage of Percentage of Series Total Series Total Capital Capital Series Unconsolidated Fair Value Unconsolidated Fair Value Frontier Diversified Series — Frontier Trading Company XXXVIII 0.49 % $ 16,682 0.40 % $ 16,669 Frontier Masters Fund --- Frontier Trading Company XXXVIII 0.72 % $ 5,846 0.09 % $ 907 Frontier Long/Short Commodity Fund --- Frontier Trading Company XXXVIII 0.73 % $ 10,331 1.35 % $ 17,736 Frontier Balanced Fund --- Frontier Trading Company XXXVIII 0.73 % $ 78,686 0.41 % $ 49,755 Frontier Select Fund --- Frontier Trading Companies XXXVIII 0.20 % $ 3,273 0.00 % $ - Frontier Global Fund --- Frontier Trading Company XXXVIII 0.30 % $ 8,406 0.04 % $ 1,083 Frontier Heritage Fund --- Frontier Trading Company XXXVIII 0.40 % $ 10,083 0.12 % $ 2,880 The following tables summarize each of the Series’ equity in earnings from unconsolidated Trading Companies and private investment companies for the three and six months ended June 30, 2021 and June 30, 2020. Three months ended June 30, 2021 and 2020 Three Months Ended June, 2021 Three Months Ended June, 2020 Change in Change in Trading Realized Unrealized Net Income Trading Realized Unrealized Net Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Frontier Balanced Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (8,036 ) $ (8,036 ) $ - $ - $ 13,836 $ 13,836 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (973 ) 51,102 52,345 102,474 (5,100 ) (88,960 ) (255,603 ) (349,663 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (433 ) - (433 ) (2,152 ) (49,427 ) 67,132 15,553 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 252 - 252 (6,408 ) (407,643 ) 414,194 143 Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (6,399 ) 197,477 51,803 242,881 (15,974 ) (403,362 ) 546,868 127,532 Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,910 ) - (1,910 ) (502 ) (239,751 ) 237,492 (2,761 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (2,902 ) (19,728 ) (174,263 ) (196,893 ) (8,555 ) (693,367 ) 349,783 (352,139 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (4,586 ) 68,282 (31,967 ) 31,729 (1,701 ) 79,790 (195,781 ) (117,692 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (14,466 ) 147,713 231,570 364,817 (12,641 ) 563,690 (927,823 ) (376,774 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (1,144 ) 72,781 (48,358 ) 23,279 - - - - Total $ (30,470 ) $ 515,536 $ 73,094 $ 558,160 $ (53,033 ) $ (1,239,030 ) $ 250,098 $ (1,041,965 ) Frontier Global Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (970 ) $ (970 ) $ - $ - $ 4,623 $ 4,623 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,816 ) 92,598 47,380 138,162 (8,398 ) (308,501 ) (328,301 ) (645,200 ) Total $ (1,816 ) $ 92,598 $ 46,410 $ 137,192 $ (8,398 ) $ (308,501 ) $ (323,678 ) $ (640,577 ) Frontier Select Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 148 $ 148 $ - $ - $ (143 ) $ (143 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - 387 - 387 - - (1,616 ) (1,616 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,951 ) 55,643 67,990 118,682 (4,125 ) 170,109 (288,624 ) (122,640 ) Galaxy Plus Fund - TT Feeder Fund (531) LLC - 864 - 864 (5,392 ) (220,692 ) 226,084 - Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (521 ) 24,894 (24,404 ) (29 ) - - - - Total $ (5,472 ) $ 81,788 $ 43,734 $ 120,052 $ (9,517 ) $ (50,583 ) $ (64,299 ) $ (124,399 ) Frontier Heritage Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 391 $ 391 $ - $ - $ 2,779 $ 2,779 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,086 ) 51,481 14,949 65,344 (2,774 ) (35,321 ) (179,266 ) (217,361 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,840 ) 55,770 61,982 112,910 (3,878 ) 211,068 (336,224 ) (129,034 ) Total $ (5,926 ) $ 107,251 $ 77,322 $ 178,645 $ (6,652 ) $ 175,747 $ (512,711 ) $ (343,616 ) Frontier Long/Short Commodity Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 785 $ 785 $ - $ - $ 1,630 $ 1,630 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 36 - 36 (938 ) (41,364 ) 42,301 (1 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (194 ) 102,498 (84,645 ) 17,659 (672 ) (117,782 ) 122,271 3,817 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,642 ) 30,095 32,587 60,040 (1,626 ) 83,251 (131,014 ) (49,389 ) Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) (2,701 ) 20,959 36,607 54,865 - - - - Total $ (5,537 ) $ 153,588 $ (14,666 ) $ 133,385 $ (3,236 ) $ (75,895 ) $ 35,188 $ (43,943 ) Frontier Diversified Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (4,774 ) $ (4,773 ) $ - $ - $ 4,032 $ 4,032 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (664 ) 23,903 32,380 55,619 (3,370 ) (56,966 ) (142,153 ) (202,489 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (245 ) - (245 ) (1,348 ) (29,090 ) 38,354 7,916 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 157 - 157 (4,119 ) (194,763 ) 198,882 - Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (2,921 ) 17,238 107,434 121,751 (11,130 ) (310,674 ) 377,368 55,564 Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,166 ) - (1,166 ) (309 ) (148,003 ) 146,562 (1,750 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (714 ) (4,694 ) (41,633 ) (47,041 ) (3,841 ) (190,864 ) 79,076 (115,629 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (2,332 ) 30,353 (4,431 ) 23,590 (1,514 ) 65,761 (153,963 ) (89,716 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,564 ) 28,323 38,099 63,858 (7,271 ) 382,640 (502,758 ) (127,389 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (260 ) 17,654 (12,705 ) 4,690 - - - - Total $ (9,455 ) $ 111,523 $ 114,370 $ 216,440 $ (32,902 ) $ (481,959 ) $ 45,400 $ (469,461 ) Frontier Masters Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (960 ) $ (960 ) $ - $ - $ 4,207 $ 4,207 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (419 ) 12,291 5,931 17,803 (2,049 ) (30,225 ) (132,672 ) (164,946 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (58 ) - (58 ) - - 88 88 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 52 - 52 (1,540 ) 58,199 (56,659 ) - Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (1,272 ) 13,150 20,093 31,971 (2,008 ) 117,030 (165,332 ) (50,310 ) Galaxy Plus Fund - TT Feeder Fund (531) LLC - 520 - 520 (1,851 ) (90,207 ) 92,058 - Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (172 ) 13,249 (13,886 ) (810 ) - - - - Total $ (1,863 ) $ 39,204 $ 11,178 $ 48,518 $ (7,448 ) $ 54,797 $ (258,310 ) $ (210,961 ) Six months ended June 30, 2021 and 2020 Six Months Ended June, 2021 Six Months Ended June, 2020 Change in Change in Trading Realized Unrealized Net Income Trading Realized Unrealized Net Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Frontier Balanced Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (22,317 ) $ (22,317 ) $ - $ - $ (9,465 ) $ (9,465 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (2,581 ) 156,170 59,479 213,068 (5,100 ) 12,484 4,697 12,081 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (433 ) - (433 ) (2,152 ) (55,735 ) 25,524 (32,363 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 252 - 252 (6,408 ) (718,397 ) 81,531 (643,274 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (13,166 ) 294,440 (159,281 ) 121,993 (15,974 ) (324,444 ) 189,882 (150,536 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,910 ) - (1,910 ) (502 ) (232,245 ) (21,665 ) (254,412 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (5,401 ) (203,111 ) (166,727 ) (375,239 ) (8,555 ) (667,819 ) 50,898 (625,476 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (8,909 ) 117,348 77,978 186,417 (1,701 ) 56,595 (28,862 ) 26,032 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (26,328 ) 813,419 156,670 943,761 (12,641 ) 596,931 (159,436 ) 424,854 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (2,084 ) (428,402 ) 346,244 (84,242 ) - - - - Total $ (58,469 ) $ 747,773 $ 292,046 $ 981,350 $ (53,033 ) $ (1,332,630 ) $ 133,104 $ (1,252,559 ) Frontier Global Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 15,163 $ 15,163 $ - $ - $ (454 ) $ (454 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (4,324 ) 265,492 6,828 267,996 (8,398 ) 1,157 (79,179 ) (86,420 ) Total $ (4,324 ) $ 265,492 $ 21,991 $ 283,159 $ (8,398 ) $ 1,157 $ (79,633 ) $ (86,874 ) Frontier Select Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 8,689 $ 8,689 $ - $ - $ (6,672 ) $ (6,672 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - 387 - 387 - - - - Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (8,448 ) 254,132 46,367 292,051 (4,125 ) 195,063 (1,616 ) 189,322 Galaxy Plus Fund - TT Feeder Fund (531) LLC - 864 - 864 (5,392 ) (237,723 ) (52,502 ) (295,617 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (913 ) (190,185 ) 142,152 (48,946 ) - - (32,990 ) (32,990 ) Total $ (9,361 ) $ 65,198 $ 197,208 $ 253,045 $ (9,517 ) $ (42,660 ) $ (93,780 ) $ (145,957 ) Frontier Heritage Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 13,018 $ 13,018 $ - $ - $ (3,324 ) $ (3,324 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (2,426 ) 145,165 (14,508 ) 128,231 (2,774 ) (1,359 ) (36,695 ) (40,828 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (7,964 ) 235,648 38,515 266,199 (3,878 ) 181,477 (62,681 ) 114,918 Total $ (10,390 ) $ 380,813 $ 37,025 $ 407,448 $ (6,652 ) $ 180,118 $ (102,700 ) $ 70,766 Frontier Long/Short Commodity Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 12,908 $ 12,908 $ - $ - $ (3,076 ) $ (3,076 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 36 - 36 (938 ) (103,100 ) 8,652 (95,386 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (423 ) 126,047 (102,977 ) 22,647 (672 ) (116,962 ) (15,470 ) (133,104 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,503 ) 135,810 19,696 151,003 (1,626 ) 76,796 (19,465 ) 55,705 Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) (4,509 ) 20,959 8,048 24,498 - - - - Total $ (9,435 ) $ 282,852 $ (62,325 ) $ 211,092 $ (3,236 ) $ (143,266 ) $ (29,359 ) $ (175,861 ) Frontier Diversified Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 5,472 $ 5,472 $ - $ - $ 3,023 $ 3,023 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,417 ) 76,428 31,221 106,232 (3,370 ) 31,349 10,159 38,138 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (245 ) - (245 ) (1,348 ) (39,612 ) 17,676 (23,284 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 157 - 157 (4,119 ) (463,144 ) 53,938 (413,325 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (6,152 ) 64,786 12,197 70,831 (11,130 ) (201,658 ) 79,262 (133,526 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,166 ) - (1,166 ) (309 ) (144,282 ) (12,689 ) (157,280 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (1,354 ) (50,866 ) (43,800 ) (96,020 ) (3,841 ) (244,235 ) 46,440 (201,636 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (5,095 ) 60,727 85,796 141,428 (1,514 ) 53,754 (19,897 ) 32,343 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,575 ) 139,192 32,643 167,260 (7,271 ) 376,073 (18,235 ) 350,567 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (479 ) (100,383 ) 81,334 (19,528 ) - - - - Total $ (19,072 ) $ 188,630 $ 204,863 $ 374,421 $ (32,902 ) $ (631,755 ) $ 159,677 $ (504,980 ) Frontier Masters Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 11,801 $ 11,801 $ - $ - $ (2,275 ) $ (2,275 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (772 ) 35,923 39 35,190 (2,049 ) (1,588 ) (28,072 ) (31,709 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (58 ) - (58 ) - - 88 88 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 52 - 52 (1,540 ) (190,409 ) 31,680 (160,269 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,334 ) 73,498 12,361 83,525 (2,008 ) 95,916 (9,097 ) 84,811 Galaxy Plus Fund - TT Feeder Fund (531) LLC - 520 - 520 (1,851 ) (84,259 ) (10,422 ) (96,532 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (328 ) (70,291 ) 47,892 (22,727 ) - - - - Total $ (3,434 ) $ 39,644 $ 72,093 $ 108,303 $ (7,448 ) $ (180,340 ) $ (18,098 ) $ (205,886 ) The Series’ investments in private investment companies as of June 30, 2021 have certain redemption and liquidity restrictions which are described in the following table: Redemptions Redemptions Liquidity Notice Period Permitted Restrictions Frontier Diversified Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 24 hours Daily None Galaxy Plus Fund - QIM Feeder Fund (526) LLC 24 hours Daily None Galaxy Plus Fund - Quest Feeder Fund (517) LLC 24 hours Daily None Frontier Masters Fund Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Weekly None Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Frontier Long/Short Commodity Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) 24 hours Daily None Frontier Balanced Fund Multi-Strategy Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 24 hours Daily None Galaxy Plus Fund - QIM Feeder Fund (526) LLC 24 hours Daily None Galaxy Plus Fund - Quest Feeder Fund (517) LLC 24 hours Daily None Frontier Select Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Frontier Global Fund Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Frontier Heritage Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Effective January 4, 2021, Volt Capital Management AB accessed through Galaxy Plus Fund –– Volt Diversified Alpha Feeder Fund (550) LLC) became a new commodity trading advisor for Frontier Long/Short Commodity Fund.
Frontier Funds [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies [Line Items]
Investments in Unconsolidated Trading Companies and Private Investment Companies	5. Investments in Private Investment Companies Investments in private investment companies represent cash and open trade equity invested in the private investment companies as well as the cumulative trading profits or losses allocated to the Trust by the private investment companies. Private investment companies allocate trading profits or losses on the basis of the proportion of the Trust’s capital allocated for trading to each respective private investment company, which bears no relationship to the amount of cash invested by the Trust in the private investment companies. Investments in private investment companies are valued using the NAV provided by the underlying private investment. The Galaxy Plus structure is made up of feeder funds in which the Trust invests and master trading entities into which the feeder funds invest. No investment held by a Galaxy Plus master trading entity is greater than 5% of the Trust’s total capital. The following table summarizes the Trust’s equity in earnings from each of the private investment companies during the three and six months ended June 30, 2021 and 2020: Three months ended June 30, 2021 and 2020 Three Months Ended June, 2021 Three Months Ended June, 2020 Trading Realized Change in Net Income Trading Realized Change in Net Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ (4,958 ) $ 231,375 $ 152,986 $ 379,403 $ (21,691 ) $ (519,973 ) $ (1,037,995 ) $ (1,579,659 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (349 ) - (349 ) (3,500 ) (78,517 ) 103,958 21,941 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 497 - 497 (13,005 ) (585,571 ) 598,718 142 Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (9,320 ) 214,715 159,237 364,632 (27,104 ) (714,036 ) 924,235 183,095 Galaxy Plus Fund - LRR Feeder Fund (522) LLC (194 ) 99,422 (84,645 ) 14,583 (1,483 ) (505,536 ) 506,325 (694 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (3,616 ) (24,422 ) (215,896 ) (243,934 ) (12,396 ) (884,231 ) 428,859 (467,768 ) Galaxy Plus Fund - Quantmetrics Feeder Fund (527) LLC - - - - - - - - Galaxy Plus Fund - Quest Feeder Fund (517) LLC (6,918 ) 98,635 (36,398 ) 55,319 (3,215 ) 145,551 (349,745 ) (207,409 ) Galaxy Plus Fund - Quest FIT Feeder Fund (535) LLC - - (13,415 ) (13,415 ) - - - - Galaxy Plus Fund - TT Feeder Fund (531) LLC - 1,384 - 1,384 (7,243 ) (310,899 ) 318,142 - Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (30,735 ) 330,694 452,321 752,280 (31,549 ) 1,527,788 (2,351,775 ) (855,536 ) Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) (2,097 ) 128,578 (99,354 ) 27,127 - - - - Galaxy Plus Fund - Volt Diversified Alpha Feeder Fund (550) LLC) (2,701 ) 20,959 36,607 54,865 - - - - Total $ (60,539 ) $ 1,101,488 351,443 1,392,392 $ (121,186 ) $ (1,925,424 ) $ (859,278 ) $ (2,905,888 ) Six months ended June 30, 2021 and 2020 Six Months Ended June, 2021 Six Months Ended June, 2020 Trading Commissions Realized Gain/(Loss) Change in Unrealized Gain/(Loss) Net Income (Loss) Trading Commissions Realized Gain/(Loss) Change in Unrealized Gain/(Loss) Net Income (Loss) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ (11,520 ) $ 679,178 $ 83,059 $ 750,717 $ (21,691 ) $ 42,043 $ (129,090 ) $ (108,738 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (349 ) - (349 ) (3,500 ) (95,347 ) 41,672 (57,175 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 497 - 497 (13,005 ) (1,475,050 ) 175,801 (1,312,254 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (19,318 ) 359,226 (147,084 ) 192,824 (27,104 ) (526,102 ) 269,144 (284,062 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (423 ) 122,971 (102,977 ) 19,571 (1,483 ) (493,489 ) (49,824 ) (544,796 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (6,755 ) (253,977 ) (210,527 ) (471,259 ) (12,396 ) (912,054 ) 97,338 (827,112 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (14,004 ) 178,075 163,774 327,844 (3,215 ) 110,349 (48,759 ) 58,375 Galaxy Plus Fund - Quest FIT Feeder Fund (535) LLC - - 44,734 44,734 - - - - Galaxy Plus Fund - TT Feeder Fund (531) LLC - 1,384 - 1,384 (7,243 ) (321,982 ) (43,412 ) (372,637 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (54,152 ) 1,651,699 306,252 1,903,799 (31,549 ) 1,522,256 (321,416 ) 1,169,291 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC (3,804 ) (789,261 ) 617,622 (175,443 ) - - - - Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC (4,509 ) 20,959 8,048 24,499 - - - - Total $ (114,485 ) $ 1,970,402 $ 762,901 $ 2,618,818 $ (121,186 ) $ (2,149,376 ) $ (8,546 ) $ (2,279,108 ) The Trust’s investments in private investment companies have certain redemption and liquidity restrictions which are described in the following table: Redemptions Redemptions Liquidity Notice Period Permitted Restrictions Frontier Funds Multi-Strategy Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC 24 hours Daily None Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund - Volt Diversified Alpha Feeder Fund (550) LLC 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 24 hours Daily None Galaxy Plus Fund - QIM Feeder Fund (526) LLC 24 hours Daily None Galaxy Plus Fund - Quest Feeder Fund (517) LLC 24 hours Daily None Effective January 4, 2021, Volt Capital Management AB accessed through Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) became a new commodity trading advisor for Frontier Long/Short Commodity Fund.

Transactions with Affiliates

Transactions with Affiliates	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Transactions with Affiliates [Line Items]
Transactions with Affiliates	6. Transactions with Affiliates The Managing Owner contributes funds to the Trust, with respect to the Series, in order to have a 1% interest (“Minimum Purchase Commitment”) in the aggregate capital, profits and losses of all Series and in return will receive units designated as general units in the Series in which the Managing Owner invests such funds. The general units may only be purchased by the Managing Owner and may be subject to no management fees or management fees at reduced rates. Otherwise, the general units hold the same rights as the limited units. The Managing Owner will make contributions to the Series of the Trust necessary to maintain at least a 1% interest in the aggregate capital, profits and losses of the combined Series of the Trust. Such contribution was made by the Managing Owner before trading commenced for the Trust and will be maintained throughout the existence of the Trust, and the Managing Owner will make such purchases as are necessary to effect this requirement. Additionally, the Managing Owner agreed with certain regulatory bodies to maintain a 1% interest specifically in the Frontier Balanced Fund Class 1AP and 2a Units, aggregated, and each of the Frontier Long/Short Commodity Fund, Frontier Diversified Fund and Frontier Masters Fund. The 1% interest in these specific Series is included in computing the Minimum Purchase Commitment in aggregate capital. In addition to the general units the Managing Owner receives in respect of its Minimum Purchase Commitment, the Managing Owner may purchase limited units in any Series as a Limited Owner. Principals of the Managing Owner or affiliates are allowed to own beneficial interests in the Trust, with respect to the Series, as well. All Units purchased by the Managing Owner are held for investment purposes only and not for resale. The Managing Owner may make purchases or redemptions at any time on the same terms as any Limited Owner. The Trust has and will continue to have certain relationships with the Managing Owner and its affiliates. Expenses Management Fees— As of the date of this report, for a Series that has invested in a swap, a Trading Advisor does not receive any management fees directly from the Series for such swap, and instead the relevant Trading Advisor receives compensation via the fees embedded in the swap. As of December 31, 2020, the management fee embedded in (i) swaps owned by Frontier Diversified Fund was 1.00% per annum, (ii) swaps owned by Frontier Balanced Fund was 1.00% per annum, (iii) swaps owned by Frontier Long/Short Commodity Fund was 1.50% per annum, (iv) swaps owned by Frontier Select Fund was 1.00% per annum, and (v) swaps owned by Frontier Heritage Fund was 1.00% per annum, and the Managing Owner has waived the entire management fee due to it from those Series in respect of such Series’ investment in swaps. In each case, the embedded management fee was accrued on the relevant notional amount of the swap. The management fee as a percentage of the applicable Series’ notional assets will be greater than the percentage of the applicable Series’ net asset value to the extent that the notional assets of the Series exceeds its net asset value. The Managing Owner expects that the notional assets of each Series will generally be maintained at a level in excess of the net asset value of such Series and such excess may be substantial to the extent the Managing Owner deems necessary to achieve the desired level of volatility. Trading Fees— Incentive Fees— Service Fees— Units of the Frontier Diversified Fund and Frontier Masters Fund or Class 2a Units of the Frontier Long/Short Commodity Fund sold) until such Class 2 or Class 2a Units which are subject to the fee limitation are reclassified as Class 3 or Class 3a Units of the applicable Series for administrative purposes. Currently the service fee is not charged to Class 1AP investors. The Managing Owner may also pay selling agents certain additional fees and expenses for administrative and other services rendered and expenses incurred by such selling agents. The Managing Owner has determined that the purchase of additional units of the relevant series will commence in 2021. As such, the Managing Owner has calculated the amounts for additional units of the relevant series which will be purchased and classified such amounts as Subscriptions in advance for service fee rebates of $22,650, $392, $31,725, $358,273 $, $20,378, $156,772, and $66,429 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively. The following table summarizes fees earned by the Managing Owner for the three and six months ended June 30, 2021 and June 30, 2020, respectively . Incentive (Rebate) Management Service Trading Three Months Ended June 30, 2021 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 501 $ 33,037 Frontier Masters Fund - - 147 13,305 Frontier Long/Short Commodity Fund - - 58 10,050 Frontier Balanced Fund - 4,595 65,729 109,550 Frontier Select Fund - - 11,804 12,010 Frontier Global Fund - - 20,452 37,220 Frontier Heritage Fund - - 17,745 25,996 Incentive (Rebate) Management Service Trading Three Months Ended June 30, 2020 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 2,943 $ 57,135 Frontier Masters Fund - - 499 29,246 Frontier Long/Short Commodity Fund - - 111 7,765 Frontier Balanced Fund - 4,704 85,674 138,508 Frontier Select Fund - - 17,932 15,445 Frontier Global Fund - - 27,786 52,118 Frontier Heritage Fund - - 17,944 28,037 Incentive (Rebate) Management Service Trading Six Months Ended June 30, 2021 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 1,550 $ 67,974 Frontier Masters Fund - - 357 28,168 Frontier Long/Short Commodity Fund - - 112 18,815 Frontier Balanced Fund 49,840 9,214 132,996 223,989 Frontier Select Fund - - 23,242 23,365 Frontier Global Fund - - 40,390 72,350 Frontier Heritage Fund - - 33,902 49,672 Incentive (Rebate) Management Service Trading Six Months Ended June 30, 2020 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 10,650 $ 157,685 Frontier Masters Fund - - 1,094 61,645 Frontier Long/Short Commodity Fund - - 222 17,312 Frontier Balanced Fund - 9,724 210,982 223,989 Frontier Select Fund - - 38,092 32,400 Frontier Global Fund - - 58,227 107,673 Frontier Heritage Fund - - 35,957 57,942 The following table summarizes fees payable to the Managing Owner as of June 30, 2021 and December 31, 2020. Incentive Management Interest Service Trading As of June 30, 2021 Fees Fees Fees Fees Fees Frontier Diversified Fund $ - $ - $ - $ 158 $ 10,587 Frontier Masters Fund - - - 47 4,440 Frontier Long/Short Commodity Fund - - 37 20 3,492 Frontier Balanced Fund - 1,511 1,870 19,481 36,556 Frontier Select Fund - - 107 3,707 4,110 Frontier Global Fund - - 232 6,307 12,632 Frontier Heritage Fund - - 235 5,306 8,987 Incentive Management Interest Service Trading As of December 31, 2020 Fees Fees Fees Fees Fees Frontier Diversified Fund $ - $ - $ - $ 385 $ 12,576 Frontier Masters Fund - - - 70 5,460 Frontier Long/Short Commodity Fund - - 87 18 2,281 Frontier Balanced Fund - 8,854 1,376 21,381 37,894 Frontier Select Fund - - 179 3,709 3,933 Frontier Global Fund - - 326 6,348 11,849 Frontier Heritage Fund - - 139 4,794 7,705 With respect to the service fees, the initial service fee (for the first 12 months) relating to a purchase of Units by an investor is prepaid by the Managing Owner to the relevant selling agent in the month following such purchase and is reimbursed therefore by the Series monthly in arrears in an amount based upon a corresponding percentage of NAV, calculated daily. Consequently, the Managing Owner bears the risk and the benefit of the upside potential of any difference between the amount of the initial service fee prepaid by it and the amount of the reimbursement thereof, which may result from variations in NAV over the following 12 months. Aggregate interest income from all sources, including U.S. Treasury Securities assets net of premiums and cash held at clearing brokers, of up to the first 2% (annualized) of average net assets less any fair market value related to swaps is paid to the Managing Owner by the Frontier Balanced Fund (Class 1 and Class 2), Frontier Long/Short Commodity Fund (Class 2 and Class 3), Frontier Global Fund, Frontier Select Fund, and Frontier Heritage Fund. For the Frontier Diversified Fund, Frontier Long/Short Commodity Fund (Class 1a, Class 2a and Class 3a), Frontier Masters Fund, and Frontier Balanced Fund (Class 1AP, Class 2a and Class 3a), 100% of the interest is retained by the respective Series. Frontier Masters Fund Class 1 was closed as of April 1, 2021. All swaps were sold as of December 31, 2020. The following table outlines the interest paid by each series to the Managing owner and its ratio to average net assets for the three and six months ended June 30, 2021 and 2020 . Three Months Ended June 30, June 30, June 30, June 30, Gross Amount Gross Amount Ratio to Average Ratio to Average Frontier Diversified Fund Class 1 $ - $ - 0.00 % 0.00 % Frontier Diversified Fund Class 2 - - 0.00 % 0.00 % Frontier Diversified Fund Class 3 - - 0.00 % 0.00 % Frontier Masters Fund Class 1 - - 0.00 % 0.00 % Frontier Masters Fund Class 2 - - 0.00 % 0.00 % Frontier Masters Fund Class 3 - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2 7 5 0.02 % 0.01 % Frontier Long/Short Commodity Fund Class 3 181 114 0.02 % 0.01 % Frontier Long/Short Commodity Fund Class 1a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 3a - - 0.00 % 0.00 % Frontier Balanced Fund Class 1 3,247 2,221 0.04 % 0.01 % Frontier Balanced Fund Class 1AP 44 31 0.04 % 0.01 % Frontier Balanced Fund Class 2 649 425 0.04 % 0.01 % Frontier Balanced Fund Class 2a 7 5 0.01 % 0.00 % Frontier Balanced Fund Class 3a 39 23 0.01 % 0.00 % Frontier Select Fund Class 1 778 779 0.05 % 0.03 % Frontier Select Fund Class 1AP 5 3 0.05 % 0.03 % Frontier Select Fund Class 2 37 26 0.05 % 0.03 % Frontier Global Fund Class 1 649 1,203 0.02 % 0.03 % Frontier Global Fund Class 1AP - 11 0.00 % 0.03 % Frontier Global Fund Class 2 49 110 0.02 % 0.03 % Frontier Heritage Fund Class 1 1,010 728 0.04 % 0.03 % Frontier Heritage Fund Class 1AP 4 3 0.05 % 0.03 % Frontier Heritage Fund Class 2 103 170 0.04 % 0.03 % Total $ 6,809 $ 5,857 Six months ended June 30, June 30, June 30, June 30, Gross Amount Gross Amount Ratio to Average Ratio to Average Frontier Diversified Fund Class 1 $ - $ - 0.00 % 0.00 % Frontier Diversified Fund Class 2 - - 0.00 % 0.00 % Frontier Diversified Fund Class 3 - - 0.00 % 0.00 % Frontier Masters Fund Class 1 - - 0.00 % 0.00 % Frontier Masters Fund Class 2 - - 0.00 % 0.00 % Frontier Masters Fund Class 3 - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2 14 8 0.04 % 0.02 % Frontier Long/Short Commodity Fund Class 3 408 196 0.04 % 0.02 % Frontier Long/Short Commodity Fund Class 1a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 3a - - 0.00 % 0.00 % Frontier Balanced Fund Class 1 3,547 4,400 0.04 % 0.03 % Frontier Balanced Fund Class 1AP 47 62 0.04 % 0.03 % Frontier Balanced Fund Class 2 719 859 0.04 % 0.03 % Frontier Balanced Fund Class 2a 7 10 0.01 % 0.01 % Frontier Balanced Fund Class 3a 42 46 0.01 % 0.01 % Frontier Select Fund Class 1 1,568 1,733 0.10 % 0.07 % Frontier Select Fund Class 1AP 10 7 0.10 % 0.06 % Frontier Select Fund Class 2 72 58 0.10 % 0.07 % Frontier Global Fund Class 1 2,104 1,748 0.08 % 0.04 % Frontier Global Fund Class 1AP - 16 0.00 % 0.05 % Frontier Global Fund Class 2 152 151 0.08 % 0.05 % Frontier Heritage Fund Class 1 2,048 1,648 0.09 % 0.07 % Frontier Heritage Fund Class 1AP 8 6 0.09 % 0.07 % Frontier Heritage Fund Class 2 207 388 0.09 % 0.07 % Total $ 10,953 $ 11,336
Frontier Funds [Member]
Transactions with Affiliates [Line Items]
Transactions with Affiliates	6. Transactions with Affiliates The Managing Owner contributes funds to the Trust in order to have a 1% interest in the aggregate capital, profits and losses and in return will receive units designated as general units in the Series of the Trust in which the Managing Owner invests such funds. The general units may only be purchased by the Managing Owner and may be subject to no advisory fees or management advisory fees at reduced rates. Otherwise, the general units hold the same rights as the limited units. The Managing Owner is required to maintain at least a 1% interest (“Minimum Purchase Commitment”) in the aggregate capital, profits and losses of the Trust so long as it is acting as the Managing Owner of the Trust. Such contribution was made by the Managing Owner before trading commenced for the Trust and will be maintained throughout the existence of the Trust, and the Managing Owner will make such purchases as are necessary to effect this requirement. Additionally, the Managing Owner agreed with certain regulatory bodies to maintain a 1% interest specifically in the Frontier Balanced Fund Class 1AP Units and Frontier Balanced Fund Class 2a Units, aggregated, and each of the Frontier Long/Short Commodity Fund, Frontier Diversified Fund, and Frontier Masters Fund. The 1% interest in these specific Series of the Trust is included in computing the Minimum Purchase Commitment in aggregate capital. In addition to the general units the Managing Owner receives in respect of its Minimum Purchase Commitment, the Managing Owner may purchase limited units in any Series as a Limited Owner. Principals of the Managing Owner or affiliates are allowed to own beneficial interests in the Trust, as well. All units purchased by the Managing Owner are held for investment purposes only and not for resale. The Managing Owner may make purchases or redemptions at any time on the same terms as any Limited Owner. The Trust has and will continue to have certain relationships with the Managing Owner and its affiliates. Expenses Management Fees— The management fee as a percentage of the applicable Series’ notional assets will be greater than the percentage of the applicable Series’ net asset value to the extent that the notional assets of the Series exceeds its net asset value. The Managing Owner expects that the notional assets of each Series will generally be maintained at a level in excess of the net asset value of such Series and such excess may be substantial to the extent the Managing Owner deems necessary to achieve the desired level of volatility. Trading Fees— Incentive Fees— Service Fees— As of June 30, 2021, the Trust had a payable to the Managing Owner in the amounts of $0, $1,511, $2,481, $80,804 and $35,026 for incentive fees, management fees, interest, trading fees, and service fees, respectively. As of December 31, 2020, the Trust had a payable to the Managing Owner in the amounts of $0, $8,854, $2,107, $81,698, and $36,705 for incentive fees, management fees, interest, trading fees, and service fees, respectively. For the six months ended June 30, 2021, the Managing Owner earned $49,840, $9,214, $2,764, $232,549, and $484,333 for incentive fees, management fees, risk analysis fees, service fees, and trading fees, respectively. For the six months ended June 30, 2020, the Managing Owner earned $0, $9,724, $2,917, $355,224, and $772,150 for incentive fees, management fees, risk analysis fees, service fees, and trading fees, respectively. For the three months ended June 30, 2021 the Trust paid the Managing Owner $0, $4,595, $1,378, $116,436 and $241,168 for incentive fees, management fees, risk analysis fees, service fees, and trading fees, respectively. For the three months ended June 30, 2020, the Trust paid the Managing Owner $0, $4,704, $1,411, $152,889 and $382,254 for incentive fees, management fees, risk analysis fees, service fees, and trading fees, respectively. With respect to the service fees, the initial service fee (for the first 12 months) relating to a purchase of Units by an investor is prepaid by the Managing Owner to the relevant selling agent in the month following such purchase and is reimbursed therefore by the Series monthly in arrears in an amount based upon a corresponding percentage of NAV, calculated daily. Consequently, the Managing Owner bears the risk and enjoys the benefit of the upside potential of any difference between the amount of the initial service fee prepaid by it and the amount of the reimbursement thereof, which may result from variations in NAV over the following 12 months. Aggregate interest income from all sources, including U.S. Treasury Securities assets net of premiums and cash held at clearing brokers, of up to the first 2% (annualized) is paid to the Managing Owner by the Frontier Balanced Fund (Class 1 and Class 2 only), Frontier Long/Short Commodity Fund (Class 2 and Class 3), Frontier Global Fund, Frontier Select Fund, and Frontier Heritage Fund. For the Frontier Diversified Fund, Frontier Long/Short Commodity Fund (for the three months ended June 30, 2021, and June 30, 2020 amounts received or receivable from the Managing Owner for the difference in monthly service fees from the prepaid initial service fees Class 1a, Class 2a and Class 3a), Frontier Masters Fund, and Frontier Balanced Fund (Class 1AP, Class 2a and Class 3a), 100% of the interest is retained by the respective Series. During the three months ended June 30, 2021 and June 30, 2020 and, the Trust paid $6,809, and $5,857, respectively of such interest income to the Managing Owner. Such amounts are not included in the consolidated statements of operations of the Trust. All other interest income is recorded by the Trust on the consolidated statements of operations.

Financial Highlights

Financial Highlights	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Financial Highlights [Line Items]
Financial Highlights	7. Financial Highlights The following information presents the financial highlights of the Series, for the three and six months ended June 30, 2021 and 2020. This data has been derived from the information presented in the financial statements. For the three months ended June 30, 2021 Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, March 31, 2021 $ 74.62 $ 91.71 $ 85.97 $ 57.44 $ 70.61 $ 66.45 $ 90.39 $ 58.49 $ 94.82 $ 61.77 Net operating results: Interest income 0.00 0.00 0.00 0.07 0.08 0.08 0.07 0.05 0.07 0.05 Expenses (1.61 ) (0.90 ) (0.84 ) (1.73 ) (1.16 ) (1.09 ) (0.70 ) (0.45 ) (0.73 ) (0.48 ) Net gain/(loss) on investments, net of non-controlling interests 4.67 5.09 4.82 (55.78 )* 3.99 3.79 8.73 5.65 9.16 6.02 Net income/(loss) 3.06 4.19 3.98 (57.44 )* 2.91 2.78 8.10 5.25 8.50 5.59 Net asset value, June 30, 2021 $ 77.68 $ 95.90 $ 89.95 $ - * $ 73.52 $ 69.23 $ 98.49 $ 63.74 $ 103.32 $ 67.36 Ratios to average net assets Net investment income/(loss) -8.20 % -3.71 % -3.71 % -11.62 % -5.83 % -5.83 % -2.53 % -2.53 % -2.53 % -2.53 % Expenses before incentive fees (3)(4) 8.20 % 3.71 % 3.71 % 12.07 % 6.28 % 6.28 % 2.81 % 2.81 % 2.81 % 2.81 % Expenses after incentive fees (3)(4) 8.20 % 3.71 % 3.71 % 12.07 % 6.28 % 6.28 % 2.81 % 2.81 % 2.81 % 2.81 % Total return before incentive fees (2) 4.10 % 4.57 % 4.63 % 0.47 %* 4.12 % 4.18 % 8.96 % 8.98 % 8.96 % 9.05 % Total return after incentive fees (2) 4.10 % 4.57 % 4.63 % 0.47 %* 4.12 % 4.18 % 8.96 % 8.98 % 8.96 % 9.05 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2021 $ 83.39 $ 101.75 $ 137.21 $ 118.98 $ 118.58 $ 62.56 $ 76.41 $ 101.40 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (1.54 ) (1.10 ) (1.48 ) (1.28 ) (1.28 ) (0.96 ) (0.58 ) (0.77 ) Net gain/(loss) on investments, net of non-controlling interests 4.01 4.90 6.61 5.77 5.75 4.57 5.61 7.44 Net income/(loss) 2.47 3.80 5.13 4.49 4.47 3.61 5.03 6.67 Net asset value, June 30, 2021 $ 85.86 $ 105.55 $ 142.34 $ 123.47 $ 123.05 $ 66.17 $ 81.44 $ 108.07 Ratios to average net assets Net investment income/(loss) -7.11 % -4.11 % -4.11 % -4.11 % -4.11 % -5.91 % -2.90 % -2.90 % Expenses before incentive fees (3)(4) 7.12 % 4.11 % 4.11 % 4.11 % 4.11 % 5.91 % 2.90 % 2.90 % Expenses after incentive fees (3)(4) 7.12 % 4.11 % 4.11 % 4.11 % 4.11 % 5.91 % 2.90 % 2.90 % Total return before incentive fees (2) 2.96 % 3.73 % 3.74 % 3.77 % 3.77 % 5.77 % 6.58 % 6.58 % Total return after incentive fees (2) 2.96 % 3.73 % 3.74 % 3.77 % 3.77 % 5.77 % 6.58 % 6.58 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2021 $ 114.32 $ 174.01 $ 103.77 $ 126.74 $ 169.62 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 Expenses (2.45 ) (2.36 ) (1.93 ) (1.35 ) (1.81 ) Net gain/(loss) on investments, net of non-controlling interests 5.41 8.20 7.42 9.06 12.12 Net income/(loss) 2.96 5.84 5.49 7.71 10.31 Net asset value, June 30, 2021 $ 117.28 $ 179.85 $ 109.26 $ 134.45 $ 179.93 Ratios to average net assets Net investment income/(loss) -8.09 % -5.09 % -6.98 % -3.98 % -3.98 % Expenses before incentive fees (3)(4) 8.09 % 5.09 % 6.98 % 3.98 % 3.98 % Expenses after incentive fees (3)(4) 8.09 % 5.09 % 6.98 % 3.98 % 3.98 % Total return before incentive fees (2) 2.59 % 3.36 % 5.29 % 6.08 % 6.08 % Total return after incentive fees (2) 2.59 % 3.36 % 5.29 % 6.08 % 6.08 % (1) Interest income and expenses per unit are calculated by dividing these amounts by the average number of units outstanding during the period. The net gain/(loss) on investments, net of non-controlling interests is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information. (2) Impact of incentive fee computed using average net assets, otherwise computed using average units outstanding during the period prior to the effects of any non-controlling transactions. An owner’s total returns may vary from the above returns based on the timing of contributions and withdrawals. Total returns are not annualized. (3) Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Statements of Operations of the Series, see footnote 6. (4) Expense ratios do not include management and incentive fees at the Galaxy Plus entities. The ratios would have been higher had those expenses been included. The impact of those fees are included in the total return. *Class 1 of Frontier Master Fund was liquidated as of April 1, 2021. For the three months ended June 30, 2020 Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 1a Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, March 31, 2020 $ 79.15 $ 95.60 $ 89.39 $ 71.34 $ 86.18 $ 80.89 $ 47.69 $ 88.66 $ 56.98 $ 93.01 $ 60.02 Net operating results: Interest income 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.03 0.02 0.03 0.02 Expenses (0.85 ) (0.63 ) (0.58 ) (3.81 ) (1.19 ) (1.12 ) (0.69 ) (0.48 ) (0.31 ) (0.51 ) (0.33 ) Net gain/(loss) on investments, net of non-controlling interests (4.22 ) (5.09 ) (4.72 ) (5.63 ) (9.89 ) (9.23 ) (2.45 ) (4.94 ) (3.21 ) (5.18 ) (3.33 ) Net income/(loss) (5.06 ) (5.72 ) (5.30 ) (9.42 ) (11.05 ) (10.33 ) (3.12 ) (5.39 ) (3.50 ) (5.66 ) (3.64 ) Net asset value, June 30, 2020 $ 74.09 $ 89.88 $ 84.09 $ 61.92 $ 75.13 $ 70.56 $ 44.58 $ 83.27 $ 53.49 $ 87.35 $ 56.38 Ratios to average net assets Net investment income/(loss) -3.38 % -2.07 % -2.07 % -21.01 % -5.36 % -5.36 % -5.96 % -2.17 % -2.17 % -2.17 % -2.17 % Expenses before incentive fees (3)(4) 3.41 % 2.10 % 2.10 % 21.10 % 5.45 % 5.45 % 6.10 % 2.31 % 2.31 % 2.31 % 2.31 % Expenses after incentive fees (3)(4) 3.41 % 2.10 % 2.10 % 21.10 % 5.45 % 5.45 % 6.10 % 2.31 % 2.31 % 2.31 % 2.31 % Total return before incentive fees (2) -6.39 % -5.98 % -5.93 % -13.21 % -12.83 % -12.77 % -6.55 % -6.08 % -6.14 % -6.08 % -6.06 % Total return after incentive fees (2) -6.39 % -5.98 % -5.93 % -13.21 % -12.83 % -12.77 % -6.55 % -6.08 % -6.14 % -6.08 % -6.06 % Incentive fee per share - - - - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2020 $ 86.02 $ 101.87 $ 137.37 $ 119.07 $ 118.66 $ 67.48 $ 79.99 $ 106.15 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (1.35 ) (0.90 ) (17.96 ) (1.06 ) (1.05 ) (0.83 ) (0.45 ) (0.59 ) Net gain/(loss) on investments, net of non-controlling interests (6.09 ) (7.21 ) 7.02 (8.40 ) (8.37 ) (5.60 ) (6.64 ) (8.81 ) Net income/(loss) (7.43 ) (8.11 ) (10.93 ) (9.46 ) (9.42 ) (6.44 ) (7.09 ) (9.40 ) Net asset value, June 30, 2020 $ 78.59 $ 93.76 $ 126.44 $ 109.61 $ 109.24 $ 61.04 $ 72.90 $ 96.75 Ratios to average net assets Net investment income/(loss) -4.77 % -2.72 % -2.72 % -2.72 % -2.72 % -4.89 % -2.22 % -2.22 % Expenses before incentive fees (3)(4) 4.77 % 2.72 % 2.72 % 2.72 % 2.72 % 4.89 % 2.22 % 2.22 % Expenses after incentive fees (3)(4) 4.77 % 2.72 % 2.72 % 2.72 % 2.72 % 4.89 % 2.22 % 2.22 % Total return before incentive fees (2) -8.64 % -7.96 % -7.96 % -7.94 % -7.94 % -9.54 % -8.86 % -8.86 % Total return after incentive fees (2) -8.64 % -7.96 % -7.96 % -7.94 % -7.94 % -9.54 % -8.86 % -8.86 % Incentive fee per share - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 1AP Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2020 $ 145.97 $ 173.08 $ 215.64 $ 114.21 $ 135.37 $ 181.17 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (2.53 ) (1.89 ) (2.36 ) (1.76 ) (1.16 ) (1.55 ) Net gain/(loss) on investments, net of non-controlling interests (21.76 ) (25.83 ) (32.19 ) (15.94 ) (18.96 ) (25.38 ) Net income/(loss) (24.29 ) (27.73 ) (34.55 ) (17.70 ) (20.12 ) (26.93 ) Net asset value, June 30, 2020 $ 121.68 $ 145.35 $ 181.09 $ 96.51 $ 115.25 $ 154.24 Ratios to average net assets Net investment income/(loss) -7.44 % -4.70 % -4.70 % -6.79 % -3.79 % -3.79 % Expenses before incentive fees (3)(4) 7.44 % 4.70 % 4.70 % 6.79 % 3.79 % 3.79 % Expenses after incentive fees (3)(4) 7.44 % 4.70 % 4.70 % 6.79 % 3.79 % 3.79 % Total return before incentive fees (2) -16.64 % -16.02 % -16.02 % -15.50 % -14.87 % -14.87 % Total return after incentive fees (2) -16.64 % -16.02 % -16.02 % -15.50 % -14.87 % -14.87 % Incentive fee per share - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % (1) Interest income and expenses per unit are calculated by dividing these amounts by the average number of units outstanding during the period. The net gain/(loss) on investments, net of non-controlling interests is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information. (2) Impact of incentive fee computed using average net assets, otherwise computed using average units outstanding during the period prior to the effects of any non-controlling transactions. An owner’s total returns may vary from the above returns based on the timing of contributions and withdrawals. Total returns are not annualized. (3) Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Statements of Operations of the Series, see footnote 6. (4) Expense ratios do not include management and incentive fees at the Galaxy Plus entities. The ratios would have been higher had those expenses been included. The impact of those fees are included in the total return. For the six months ended June 30, 2021 Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, December 31, 2020 $ 72.68 $ 88.95 $ 83.33 $ 55.18 $ 67.54 $ 63.52 $ 85.99 $ 55.29 $ 90.21 $ 58.37 Net operating results: Interest income 0.03 0.04 0.04 0.11 0.14 0.13 0.16 0.10 0.16 0.11 Expenses (2.49 ) (1.69 ) (1.58 ) (3.75 ) (2.20 ) (2.07 ) (1.29 ) (0.83 ) (1.35 ) (0.88 ) Net gain/(loss) on investments, net of non-controlling interests 7.46 8.60 8.16 (51.54 )* 8.04 7.65 13.63 9.18 14.30 9.76 Net income/(loss) 5.00 6.95 6.62 (55.18 )* 5.98 5.71 12.50 8.45 13.11 8.99 Net asset value, June 30, 2021 $ 77.68 $ 95.90 $ 89.95 $ - * $ 73.52 $ 69.23 $ 98.49 $ 63.74 $ 103.32 $ 67.36 Ratios to average net assets Net investment income/(loss) -6.71 % -3.58 % -3.58 % -13.18 % -5.86 % -5.86 % -2.41 % -2.41 % -2.41 % -2.41 % Expenses before incentive fees (3)(4) 6.80 % 3.66 % 3.66 % 13.58 % 6.26 % 6.26 % 2.74 % 2.74 % 2.74 % 2.74 % Expenses after incentive fees (3)(4) 6.80 % 3.66 % 3.66 % 13.58 % 6.26 % 6.26 % 2.74 % 2.74 % 2.74 % 2.74 % Total return before incentive fees (2) 6.88 % 7.81 % 7.94 % 4.58 %* 8.85 % 8.99 % 14.54 % 15.28 % 14.53 % 15.40 % Total return after incentive fees (2) 6.88 % 7.81 % 7.94 % 4.58 %* 8.85 % 8.99 % 14.54 % 15.28 % 14.53 % 15.40 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2020 $ 79.93 $ 96.81 $ 130.54 $ 113.20 $ 112.81 $ 58.55 $ 70.99 $ 94.20 Net operating results: Interest income - - - - - - - - Expenses (3.35 ) (2.56 ) (3.44 ) (2.98 ) (2.99 ) (1.82 ) (1.09 ) (1.45 ) Net gain/(loss) on investments, net of non-controlling interests 9.28 11.30 15.24 13.25 13.23 9.44 11.54 15.32 Net income/(loss) 5.93 8.74 11.80 10.27 10.24 7.62 10.45 13.87 Net asset value, June 30, 2021 $ 85.86 $ 105.55 $ 142.34 $ 123.47 $ 123.05 $ 66.17 $ 81.44 $ 108.07 Ratios to average net assets Net investment income/(loss) -8.05 % -5.05 % -5.05 % -5.05 % -5.05 % -5.88 % -2.87 % -2.87 % Expenses before incentive fees (3)(4) 7.18 % 4.17 % 4.17 % 4.17 % 4.17 % 5.88 % 2.87 % 2.87 % Expenses after incentive fees (3)(4) 8.06 % 5.05 % 5.05 % 5.05 % 5.05 % 5.88 % 2.87 % 2.87 % Total return before incentive fees (2) 6.96 % 8.56 % 8.58 % 8.61 % 8.62 % 13.01 % 14.72 % 14.72 % Total return after incentive fees (2) 7.42 % 9.03 % 9.04 % 9.07 % 9.08 % 13.01 % 14.72 % 14.72 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2020 $ 110.90 $ 167.56 $ 96.10 $ 116.50 $ 155.92 Net operating results: Interest income - - - - - Expenses (4.65 ) (4.44 ) (3.67 ) (2.55 ) (3.42 ) Net gain/(loss) on investments, net of non-controlling interests 11.03 16.73 16.83 20.50 27.43 Net income/(loss) 6.38 12.29 13.16 17.95 24.01 Net asset value, June 30, 2021 $ 117.28 $ 179.85 $ 109.26 $ 134.45 $ 179.93 Ratios to average net assets Net investment income/(loss) -8.02 % -5.02 % -6.99 % -3.99 % -3.99 % Expenses before incentive fees (3)(4) 8.02 % 5.02 % 6.99 % 3.99 % 3.99 % Expenses after incentive fees (3)(4) 8.02 % 5.02 % 6.99 % 3.99 % 3.99 % Total return before incentive fees (2) 5.75 % 7.33 % 13.69 % 15.41 % 15.40 % Total return after incentive fees (2) 5.75 % 7.33 % 13.69 % 15.41 % 15.40 % (1) Interest income and expenses per unit are calculated by dividing these amounts by the average number of units outstanding during the period. The net gain/(loss) on investments, net of non-controlling interests is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information. (2) Impact of incentive fee computed using average net assets, otherwise computed using average units outstanding during the period prior to the effects of any non-controlling transactions. An owner’s total returns may vary from the above returns based on the timing of contributions and withdrawals. Total returns are not annualized. (3) Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Statements of Operations of the Series, see footnote 6. (4) Expense ratios do not include management and incentive fees at the Galaxy Plus entities. The ratios would have been higher had those expenses been included. The impact of those fees are included in the total return. *Class 1 of Frontier Masters Fund was liquidated as of April 1, 2021. For the six months ended June 30, 2020 Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 1a Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, December 31, 2019 $ 101.10 $ 121.58 $ 113.61 $ 72.28 $ 87.18 $ 81.78 $ 44.20 $ 81.60 $ 52.55 $ 85.64 $ 55.31 Net operating results: Interest income 0.01 0.01 0.01 0.05 0.06 0.06 0.04 0.07 0.04 0.07 0.05 Expenses (3.31 ) (1.98 ) (1.76 ) (8.37 ) (2.64 ) (2.47 ) (1.44 ) (1.09 ) (0.70 ) (1.14 ) (0.74 ) Net gain/(loss) on investments, net of non-controlling interests (23.71 ) (29.73 ) (27.76 ) (2.04 ) (9.48 ) (8.81 ) 1.77 2.68 1.60 2.78 1.76 Net income/(loss) (27.01 ) (31.70 ) (29.52 ) (10.36 ) (12.05 ) (11.22 ) 0.37 1.67 0.94 1.71 1.07 Net asset value, June 30, 2020 $ 74.09 $ 89.88 $ 84.09 $ 61.92 $ 75.13 $ 70.56 $ 44.58 $ 83.27 $ 53.49 $ 87.35 $ 56.38 Ratios to average net assets Net investment income/(loss) -7.10 % -3.56 % -3.56 % -23.98 % -6.12 % -6.12 % -6.23 % -2.43 % -2.43 % -2.43 % -2.43 % Expenses before incentive fees (3)(4) 7.12 % 3.58 % 3.58 % 24.13 % 6.27 % 6.27 % 6.39 % 2.59 % 2.59 % 2.59 % 2.59 % Expenses after incentive fees (3)(4) 7.12 % 3.58 % 3.58 % 24.13 % 6.27 % 6.27 % 6.39 % 2.59 % 2.59 % 2.59 % 2.59 % Total return before incentive fees (2) -26.71 % -26.07 % -25.98 % -14.34 % -13.83 % -13.72 % 0.83 % 2.04 % 1.79 % 2.00 % 1.94 % Total return after incentive fees (2) -26.71 % -26.07 % -25.98 % -14.34 % -13.83 % -13.72 % 0.83 % 2.04 % 1.79 % 2.00 % 1.94 % Incentive fee per share - - - - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2019 $ 117.23 $ 137.81 $ 185.82 $ 161.04 $ 160.50 $ 66.56 $ 78.51 $ 103.94 Net operating results: Interest income 0.03 0.04 0.05 0.05 0.05 0.00 0.00 0.00 Expenses (3.37 ) (2.25 ) (3.03 ) (2.64 ) (2.62 ) (1.80 ) (0.96 ) (1.28 ) Net gain/(loss) on investments, net of non-controlling interests (35.30 ) (41.84 ) (56.41 ) (48.84 ) (48.69 ) (3.71 ) (4.65 ) (5.92 ) Net income/(loss) (38.64 ) (44.05 ) (59.38 ) (51.43 ) (51.26 ) (5.52 ) (5.61 ) (7.19 ) Net asset value, June 30, 2020 $ 78.59 $ 93.76 $ 126.44 $ 109.61 $ 109.24 $ 61.04 $ 72.90 $ 96.75 Ratios to average net assets Net investment income/(loss) -6.82 % -3.83 % -3.83 % -3.83 % -3.83 % -5.46 % -2.46 % -2.46 % Expenses before incentive fees (3)(4) 6.89 % 3.90 % 3.90 % 3.90 % 3.90 % 5.46 % 2.46 % 2.46 % Expenses after incentive fees (3)(4) 6.89 % 3.90 % 3.90 % 3.90 % 3.90 % 5.46 % 2.46 % 2.46 % Total return before incentive fees (2) -32.96 % -31.96 % -31.96 % -31.94 % -31.94 % -8.29 % -7.15 % -6.92 % Total return after incentive fees (2) -32.96 % -31.96 % -31.96 % -31.94 % -31.94 % -8.29 % -7.15 % -6.92 % Incentive fee per share - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 1AP Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2019 $ 131.52 $ 154.43 $ 192.82 $ 97.54 $ 114.15 $ 153.59 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (5.46 ) (4.07 ) (5.10 ) (3.60 ) (2.41 ) (3.23 ) Net gain/(loss) on investments, net of non-controlling interests (4.38 ) (5.00 ) (6.63 ) 2.57 3.51 3.87 Net income/(loss) (9.84 ) (9.08 ) (11.73 ) (1.03 ) 1.10 0.65 Net asset value, June 30, 2020 $ 121.68 $ 145.35 $ 181.09 $ 96.51 $ 115.25 $ 154.24 Ratios to average net assets Net investment income/(loss) -8.08 % -5.08 % -5.08 % -6.90 % -3.90 % -3.90 % Expenses before incentive fees (3)(4) 8.08 % 5.08 % 5.08 % 6.90 % 3.90 % 3.90 % Expenses after incentive fees (3)(4) 8.08 % 5.08 % 5.08 % 6.90 % 3.90 % 3.90 % Total return before incentive fees (2) -7.48 % -5.88 % -6.08 % -1.05 % 0.96 % 0.42 % Total return after incentive fees (2) -7.48 % -5.88 % -6.08 % -1.05 % 0.96 % 0.42 % Incentive fee per share - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % (1) Interest income and expenses per unit are calculated by dividing these amounts by the average number of units outstanding during the period. The net gain/(loss) on investments, net of non-controlling interests is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information. (2) Impact of incentive fee computed using average net assets, otherwise computed using average units outstanding during the period prior to the effects of any non-controlling transactions. An owner’s total returns may vary from the above returns based on the timing of contributions and withdrawals. Total returns are not annualized. (3) Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Statements of Operations of the Series, see footnote 6. (4) Expense ratios do not include management and incentive fees at the Galaxy Plus entities. The ratios would have been higher had those expenses been included. The impact of those fees are included in the total return.
Frontier Funds [Member]
Financial Highlights [Line Items]
Financial Highlights	7. Financial Highlights The following information presents the financial highlights of the Trust for the six months and three months ended June 30, 2021 and June 30, 2020. This data has been derived from the information presented in the consolidated financial statements. Three months ended June 30 2021 2020 Ratios to average net assets (1) Net investment income/(loss) (1) -5.99 % -4.34 % Expenses before incentive fees (3) (4) 6.03 % -4.36 % Expenses after incentive fees (3) (4) 6.03 % -4.36 % Total return before incentive fees (2) 4.14 % -7.79 % Total return after incentive fees (2) 4.14 % -7.79 % Six months ended June 30 2021 2020 Ratios to average net assets (1) Net investment income/(loss) (1) -6.19 % -5.71 % Expenses before incentive fees (3) (4) 6.04 % 5.76 % Expenses after incentive fees (3) (4) 6.24 % 5.76 % Total return before incentive fees (2) 8.91 % -23.21 % Total return after incentive fees (2) 8.70 % -23.21 % (1) Annualized with the exception of incentive fees. (2) Total returns are not annualized. (3) Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Consolidated Statements of Operations of the Trust. See footnote 5. The Trust financial highlights are calculated based upon the Trust’s consolidated financial statements. The consolidated Trust does not issue units and therefore the financial highlights do not disclose any unitized data.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Derivative Instruments and Hedging Activities [Line Items]
Derivative Instruments and Hedging Activities	8. Derivative Instruments and Hedging Activities The Series’ primary business is to engage in speculative trading of a diversified portfolio of futures, forwards (including interbank foreign currencies), options contracts and other derivative instruments (including swap contracts). The Series do not enter into or hold positions for hedging purposes as defined under ASC 815, Derivatives and Hedging (“ASC 815”). The detail of the fair value of the Series’ derivatives by instrument types as of June 30, 2021 and December 31, 2020 is included in the Condensed Schedules of Investments. See Note 4 for further disclosure related to each Series’ position in swap contracts. The following tables summarize the monthly averages of futures contracts bought and sold for each respective Series of the Trust: For the three months ended June 30, 2021 Monthly average contracts: Bought Sold Frontier Balanced Fund 179 185 For the three months ended June 30, 2020 Monthly average contracts: Bought Sold Frontier Balanced Fund 507 354 For the six months ended June 30, 2021 Monthly average contracts: Bought Sold Frontier Balanced Fund 484 486 For the six Months ended June 30, 2020 Monthly average contracts: Bought Sold Frontier Balanced Fund 568 490 The following tables summarize the trading revenues for the three and six months ended June 30, 2021, and 2020 by sector: Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended June 30, 2021 Type of contract Frontier Balanced Fund Agriculturals $ 46,003 Currencies 23,445 Energies 16,610 Interest rates 9,688 Metals (52 ) Stock indices 13,469 Realized trading income/(loss) (1) $ 109,163 Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended June 30, 2020 Type of contract Frontier Balanced Fund Agriculturals $ (27,242 ) Currencies (3,074 ) Energies (9,668 ) Interest rates (113,962 ) Metals 10,260 Stock indices (77,990 ) Realized trading income/(loss) (1) $ (221,676 ) (1) Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options. Realized Trading Revenue from Futures, Forwards and Options for the Six Months Ended June 30, 2021 Frontier Balanced Type of contract Fund Agriculturals $ 109,315 Currencies (4,367 ) Energies 51,430 Interest rates 100,159 Metals 23,283 Stock indices 200,902 Realized trading income/(loss) (1) $ 480,722 Realized Trading Revenue from Futures, Forwards and Options for the Six Months Ended June 30, 2020 Frontier Balanced Type of contract Fund Agriculturals $ 25,052 Currencies (89,048 ) Energies 14,070 Interest rates 128,434 Metals 316,370 Stock indices 25,681 Realized trading income/(loss) (1) $ 420,559 (1) Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options. Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended June 30, 2021 Type of contract Frontier Balanced Fund Agriculturals $ (44,481 ) Currencies (30,413 ) Energies (2,700 ) Interest rates (15,689 ) Metals (18,299 ) Stock indices (11,046 ) Change in unrealized trading income/(loss) (1) $ (122,628 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended June 30, 2020 Type of contract Frontier Balanced Fund Agriculturals $ 32,288 Currencies (49,704 ) Energies (1,630 ) Interest rates 44,437 Metals (86,875 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (51,316 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Six Months Ended June 30, 2021 Frontier Balanced Type of contract Fund Agriculturals $ (37,679 ) Currencies (13,362 ) Energies 13,900 Interest rates (95,245 ) Metals (34,021 ) Stock indices (3,556 ) Change in unrealized trading income/(loss) (1) $ (169,963 ) (1) Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit) Net Change in Open Trade Equity from Futures, Forwards and Options for the Six Months Ended June 30, 2020 Frontier Balanced Type of contract Fund Agriculturals $ 14,916 Currencies (20,473 ) Energies (4,275 ) Interest rates 36,412 Metals (113,782 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (77,034 ) (1) Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit) Certain financial instruments and derivative instruments are eligible for offset in the statements of financial condition under GAAP. The Series’ open trade equity/(deficit), options written, and receivables from FCMs are subject to master netting arrangements and collateral arrangements and meet the GAAP guidance to qualify for offset. A master netting arrangement with a counterparty creates a right of offset for amounts due to and from that same counterparty that is enforceable in the event of a default or bankruptcy. The Series’ policy is to recognize amounts subject to master netting arrangements on a net basis on the statements of financial condition. The following tables present gross and net information about the Series’ assets and liabilities subject to master netting arrangements as disclosed on the statements of financial condition as of June 30, 2021 and December 31, 2020. As of June 30, 2021 Net Amounts Gross Amounts of Gross Amounts Presented in the recognized offset in the Statements of Derivative Statements of Financial Frontier Balanced Fund Assets/Liabilities Financial Condition Condition Open Trade Equity/(Deficit) $ 401,858 $ (473,290 ) $ (71,432 ) As of December 31, 2020 Net Amounts Gross Amounts Presented in the Gross Amounts of offset in the Statements of recognized Statements of Financial Frontier Balanced Fund Derivative Assets Financial Condition Condition Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440
Frontier Funds [Member]
Derivative Instruments and Hedging Activities [Line Items]
Derivative Instruments and Hedging Activities	8. Derivative Instruments and Hedging Activities The Trust’s primary business is to engage in speculative trading of a diversified portfolio of futures, forwards (including interbank foreign currencies), options contracts and other derivative instruments (including swap contracts). The Trust does not enter into or hold positions for hedging purposes as defined under ASC 815. The detail of the fair value of the Trust’s derivatives by instrument types as of June 30, 2021 and December 31, 2020 is included in the Consolidated Condensed Schedules of Investments. See Note 4 for further disclosure related to the Trust’s positions in swap contracts. There are embedded management fees in transacting these swaps ranging from 1% to 1.5% based on fair value of swaps and the embedded incentive fees ranging from 15% to 25% based on net new trading profits on swaps. For the three months ended June 30, 2021 and June 30, 2020, the monthly average of futures, forwards and options contracts bought was approximately 179 and 507, respectively and sold was approximately 185 and 354, respectively. For the six months ended June 30, 2021 and June 30, 2020, the monthly average of futures, forwards and options contracts bought was approximately 484 and 568, respectively and sold was approximately 486 and 490, respectively. The following tables summarize the trading revenues for the three months ended June 30, 2021 and June 30, 2020 by contract type: Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended June 30, 2021 Type of contract Agriculturals $ 46,003 Currencies 23,445 Energies 16,610 Interest rates 9,688 Metals (52 ) Stock indices 13,469 Realized trading income/(loss) (1) $ 109,163 Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended June 30, 2020 Type of contract Agriculturals $ (27,242 ) Currencies (3,074 ) Energies (9,668 ) Interest rates (113,962 ) Metals 10,260 Stock indices (77,990 ) Realized trading income/(loss) (1) $ (221,676 ) 84 Type of contract Agriculturals $ 109,315 Currencies (4,367 ) Energies 51,430 Interest rates 100,159 Metals 23,283 Stock indices 200,902 Realized trading income/(loss) (1) $ 480,722 Realized Trading Revenue from Futures, Forwards and Options for the Six Months Ended June 30, 2020 Type of contract Agriculturals $ 25,052 Currencies (89,048 ) Energies 14,070 Interest rates 128,434 Metals 316,370 Stock indices 25,681 Realized trading income/(loss) (1) $ 420,559 (1) Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options. Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended June 30, 2021 Type of contract Agriculturals $ (44,481 ) Currencies (30,413 ) Energies (2,700 ) Interest rates (15,689 ) Metals (18,299 ) Stock indices (11,046 ) Change in unrealized trading income/(loss) (1) $ (122,628 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended June 30, 2020 Type of contract Agriculturals $ 32,288 Currencies (49,704 ) Energies (1,630 ) Interest rates 44,437 Metals (86,875 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (51,316 ) Type of contract Agriculturals $ (37,679 ) Currencies (13,362 ) Energies 13,900 Interest rates (95,245 ) Metals (34,021 ) Stock indices (3,556 ) Change in unrealized trading income/(loss) (1) $ (169,963 ) Type of contract Agriculturals $ 14,916 Currencies (20,473 ) Energies (4,275 ) Interest rates 36,412 Metals (113,782 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (77,034 ) (1) Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit) Certain financial instruments and derivative instruments are eligible for offset in the statements of financial condition under GAAP. The Trust’s open trade equity/(deficit), options written, and receivables from FCMs are subject to master netting arrangements and collateral arrangements and meet the GAAP guidance to qualify for offset. A master netting arrangement with a counterparty creates a right of offset for amounts due to and from that same counterparty that is enforceable in the event of a default or bankruptcy. The Trust’s policy is to recognize amounts subject to master netting arrangements on a net basis on the consolidated statements of financial condition. The following tables present gross and net information about the Trust’s assets and liabilities subject the master netting arrangements as disclosed on the consolidated statements of financial condition as of June 30, 2021 and December 31, 2020: As of June 30, 2021 Gross Gross Amounts Net Amounts recognized Statements of in the Derivative Financial Statements of Open Trade Equity/(Deficit) $ 401,858 $ (473,290 ) $ (71,432 ) As of December 31, 2020 Gross Net Amounts Gross Amounts Presented recognized Statements of Statements of Derivative Financial Financial Frontier Balanced Fund Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440

Trading Activities and Related

Trading Activities and Related Risks	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Trading Activities and Related Risks [Line Items]
Trading Activities and Related Risks	9. Trading Activities and Related Risks The purchase and sale of futures and options on futures contracts require margin deposits with FCMs. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act, as amended (“CEA”), requires an FCM to segregate all customer transactions and assets from the FCM’s proprietary activities. A customer’s cash and other property (for example, U.S. treasury bills) deposited with an FCM are considered commingled with all other customer funds subject to the FCM’s segregation requirements. In the event of an FCM’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The term “off-balance sheet risk” refers to an unrecorded potential liability that, even though it does not appear on the statements of financial condition, may result in future obligation or loss in excess of the amount paid by the Series for a particular investment. Each Trading Company expects to trade in futures, options, forward and swap contracts and will therefore be a party to financial instruments with elements of off-balance sheet market and credit risk. In entering into these contracts, there exists a market risk that such contracts may be significantly influenced by market conditions, such as interest rate volatility, resulting in such contracts being less valuable. If the markets should move against all of the futures positions held by a Trading Company or Galaxy Plus entity in respect of any Series at the same time, and if the Trading Advisor(s) of such Trading Company or Galaxy Plus entity are unable to offset such futures interests positions, such Trading Company or Galaxy Plus entity could lose all of its assets and the holders of Units of such Series would realize a 100% loss. The Managing Owner will seek to minimize market risk through real-time monitoring of open positions and the level of diversification of each Trading Advisor’s portfolio. It is anticipated that any Trading Advisor’s margin-to-equity ratio will typically not exceed approximately 35% although the actual ratio could be higher or lower from time to time. In addition to market risk, trading futures, forward and swap contracts entails credit risk that a counterparty will not be able to meet its obligations to a Trading Company or Galaxy Plus entity. The counterparty for futures contracts traded in the United States and on most foreign exchanges is the clearinghouse associated with such exchange. In general, clearinghouses are backed by the corporate members of the clearinghouse who are required to share any financial burden resulting from the non-performance by one of their members and, as such, should significantly reduce this credit risk. In cases where the clearinghouse is not backed by the clearing members, like some foreign exchanges, it is normally backed by a consortium of banks or other financial institutions. Some non-U.S. exchanges, in contrast to U.S. exchanges, are principals’ markets in which performance is the responsibility only of the individual counterparty with whom the Trading Company has entered into the transaction, and not of the exchange or clearing corporation. In these kinds of markets, there is risk of bankruptcy or other failure or refusal to perform by the counterparty. In the case of forward contracts traded on the interbank market and swaps, neither is traded on exchanges. The counterparty is generally a single bank or other financial institution, rather than a group of financial institutions; thus there may be a greater counterparty credit risk. The Managing Owner expects the Trading Advisors to trade only with those counterparties which it believes to be creditworthy. All positions of each Trading Company will be valued each day on a mark-to-market basis. There can be no assurance that any clearing member, clearinghouse or other counterparty will be able to meet its obligations to any Trading Company. The Managing Owner has established procedures to actively monitor and minimize market and credit risks. The Limited Owners bear the risk of loss only to the extent of the market value of their respective investments and, in certain specific circumstances, distributions and redemptions received.
Frontier Funds [Member]
Trading Activities and Related Risks [Line Items]
Trading Activities and Related Risks	9. Trading Activities and Related Risks The purchase and sale of futures and options on futures contracts require margin deposits with FCMs. Additional deposits may be necessary for any loss on contract value. The CEA requires an FCM to segregate all customer transactions and assets from the FCM’s proprietary activities. A customer’s cash and other property (for example, U.S. treasury bills) deposited with an FCM are considered commingled with all other customer funds subject to the FCM’s segregation requirements. In the event of an FCM’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The term “off-balance sheet risk” refers to an unrecorded potential liability that, even though it does not appear on the statements of financial condition, may result in future obligation or loss in excess of the amount paid by the Series for a particular investment. Each Trading Company and Galaxy Plus entity expects to trade in futures, options, forward and swap contracts and will therefore be a party to financial instruments with elements of off-balance sheet market and credit risk. In entering into these contracts, there exists a market risk that such contracts may be significantly influenced by market conditions, such as interest rate volatility, resulting in such contracts being less valuable. If the markets should move against all of the futures positions held by a Trading Company or Galaxy Plus entity in respect of any Series at the same time, and if the Trading Advisor(s) of such Trading Company or Galaxy Plus entity are unable to offset such futures interests positions, such Trading Company or Galaxy Plus entity could lose all of its assets and the holders of Units of such Series would realize a 100% loss. The Managing Owner will seek to minimize market risk through real-time monitoring of open positions and the level of diversification of each Trading Advisor’s portfolio. It is anticipated that any Trading Advisor’s margin- to-equity ratio will typically not exceed approximately 35% although the actual ratio could be higher or lower from time to time. In addition to market risk, trading futures, forward and swap contracts entails credit risk that a counterparty will not be able to meet its obligations to a Trading Company or Galaxy Plus entity. The counterparty for futures contracts traded in the United States and on most foreign exchanges is the clearinghouse associated with such exchange. In general, clearinghouses are backed by the corporate members of the clearinghouse who are required to share any financial burden resulting from the non-performance by one of their members and, as such, should significantly reduce this credit risk. In cases where the clearinghouse is not backed by the clearing members, like some foreign exchanges, it is normally backed by a consortium of banks or other financial institutions. Some non-U.S. exchanges, in contrast to U.S. exchanges, are principals’ markets in which performance is the responsibility only of the individual counterparty with whom the Trading Company has entered into the transaction, and not of the exchange or clearing corporation. In these kinds of markets, there is risk of bankruptcy or other failure or refusal to perform by the counterparty. In the case of forward contracts traded on the interbank market and swaps, neither is traded on exchanges. The counterparty is generally a single bank or other financial institution, rather than a group of financial institutions; thus there may be a greater counterparty credit risk. The Managing Owner expects the Trading Advisors to trade only with those counterparties which it believes to be creditworthy. All positions of each Trading Company will be valued each day on a mark-to-market basis. There can be no assurance that any clearing member, clearinghouse or other counterparty will be able to meet its obligations to any Trading Company. The Managing Owner has established procedures to actively monitor and minimize market and credit risks. The Limited Owners bear the risk of loss only to the extent of the market value of their respective investments and, in certain specific circumstances, distributions and redemptions received.

Indemnifications and Guarantees

Indemnifications and Guarantees noted in Management Discussion and Analysis	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Indemnifications and Guarantees noted in Management Discussion and Analysis [Line Items]
Indemnifications and Guarantees noted in Management Discussion and Analysis	10. Indemnifications and Guarantees noted in Management Discussion and Analysis The Trust has entered into agreements, which provide for the indemnification of futures clearing brokers, and commodity trading advisers, among others, against losses, costs, claims and liabilities arising from the performance of their individual obligations under such agreements, except for gross negligence, bad faith or willful misconduct. The Trust has had no prior claims or payments pursuant to these agreements. The Trust’s individual maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Trust that have not yet occurred. However, based on experience the Trust expects the risk of loss to be remote. Maximum exposure is unfulfilled obligations of the Series up to the amount of equity at risk with the custodian of the referenced Series as allocated from the Trading Company. The Series have not recorded any liability for the indemnifications in the accompanying financial statements as it expects any possibility of losses to be remote.
Frontier Funds [Member]
Indemnifications and Guarantees noted in Management Discussion and Analysis [Line Items]
Indemnifications and Guarantees noted in Management Discussion and Analysis	10. Indemnifications and Guarantees The Trust has entered into agreements, which provide for the indemnification of futures clearing brokers, and commodity trading advisers, among others, against losses, costs, claims and liabilities arising from the performance of their individual obligations under such agreements, except for gross negligence, bad faith or willful misconduct. The Trust has had no prior claims or payments pursuant to these agreements. The Trust’s individual maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Trust that have not yet occurred. However, based on experience the Trust expects the risk of loss to be remote. Maximum exposure is unfulfilled obligations of the Trust up to the amount of equity at risk with the custodian of the referenced Series, as allocated from the Trading Company. The Trust has not recorded any liability for the guarantees in the accompanying financial statements as it expects any possibility of losses to be remote. The Trust has not recorded any liability for the indemnifications in the accompanying financial statements as it expects any possibility of losses to be remote.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Subsequent Events [Line Items]
Subsequent Events	11. Subsequent Events The Managing Owner evaluates events that occur after the balance sheet date but before and up until financial statements are available to be issued. The Managing Owner has assessed the subsequent events through the date that the financial statements were issued and has determined that, except as set forth below, there were no subsequent events requiring adjustment to or disclosure in the financial statements. From July 1, 2021 through August 10, 2021, Frontier Balanced Fund, Frontier Diversified Fund, Frontier Heritage Fund, Frontier Masters Fund, Frontier Select Fund and Frontier Global Fund paid $187,452, $73,672, $13,637, $19,199, $20,580 and $35,171, respectively, in redemptions.
Frontier Funds [Member]
Subsequent Events [Line Items]
Subsequent Events	11. Subsequent Events The Managing Owner evaluates events that occur after the balance sheet date but before and up until financial statements are available to be issued. The Managing Owner has assessed the subsequent events through the date that the financial statements were issued and has determined that, except as set forth below, there were no subsequent events requiring adjustment to or disclosure in the financial statements. From July 1, 2021 through August 10, 2021, the Trust paid $349,711 in redemptions.

Accounting Policies, by Policy

Accounting Policies, by Policy (Policies)	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Accounting Policies, by Policy (Policies) [Line Items]
Basis of Presentation	Basis of Presentation
Consolidation	Consolidation Galaxy Plus entities are co-mingled investment vehicles. In addition to the Series, there are other non-affiliated investors in Galaxy Plus entities. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Series’ ownership percentage in Galaxy Plus entities. It is expected that ownership percentage will fluctuate (sometimes significantly) on a week by week basis which could also result in frequent changes in the consolidating Series. Such fluctuations make consolidating the financial statements of the Galaxy Plus entities both impractical and misleading. Non-consolidation of these Galaxy Plus entities presents a more useful financial statement for the readers. As such, management has decided that presenting Galaxy Plus entities on a non-consolidated basis as investments in other investments companies (a “fund of funds” approach) is appropriate and preferable to the users of these financial statements. Refer to Note 5 for additional disclosures related to these private investment companies.
Use of Estimates	Use of Estimates—
Cash and Cash Equivalents	Cash and Cash Equivalents—
Interest Income	Interest Income U
U.S. Treasury Securities	U.S. Treasury Securities— Fair Value Measurements and Disclosures (“
Receivable from Futures Commission Merchants	Receivable From Futures Commission Merchants
Investment Transactions	Investment Transactions— Balance Sheet (“ASC 210” Balance Sheet (Topic 210 Any change in net unrealized gain or loss from the preceding period is reported in the statements of operations. Fair value of exchange-traded contracts is based upon exchange settlement prices. Fair value of non-exchange-traded contracts is based on third party quoted dealer values on the interbank market. For U.S. Treasury securities, interest is recognized in the period earned and the instruments are marked-to-market daily based on third party information. Transaction costs are recognized as incurred and reflected separately in the statements of operations.
Purchase and Sales of Private Investment Companies	Purchase and Sales of Private Investment Companies
Foreign Currency Transactions	Foreign Currency Transactions—
Allocation of Earnings	Allocation of Earnings— Each Series allocates funds to an affiliated Trading Company, or Companies, of the Trust or unaffiliated Galaxy Plus entity. Each Trading Company allocates all of its daily trading gains or losses to the Series in proportion to each Series’ ownership trading level interest in the Trading Company, adjusted on a daily basis (except for Trading Advisors and other investments such as swaps that are directly allocated to a specific Series). Likewise, trading gains and losses earned and incurred by the Series through their investments in Galaxy Plus entities are allocated to those Series on a daily basis. The allocation of gains and losses in Galaxy Plus entities are based on each Series pro-rata shares of the trading level of that entity which is updated at the beginning of each month or more frequently if there is a subscription or redemption activity in the entity. The value of all open contracts and cash held at clearing brokers is similarly allocated to the Series in proportion to each Series’ funds allocated to the Trading Companies or Galaxy Plus entities.
Investments and Swaps	Investments and Swaps
Income Taxes	Income Taxes Income Taxes The 2017 through 2020 tax years generally remain subject to examination by U.S. federal and most state tax authorities. In the opinion of the Managing Owner, (i) the Trust, with respect to the Series, is treated as a partnership for federal income tax purposes and, assuming that at least 90% of the gross income of the Trust constitutes “qualifying income” within the meaning of Section 7704(d) of the Code, (ii) the Trust is not a publicly traded partnership treated as a corporation, and (iii) the discussion set forth in the Prospectus under the heading “U.S. Federal Income Tax Consequences” correctly summarizes the material federal income tax consequences as of the date of the Prospectus to potential U.S. Limited Owners of the purchase, ownership and disposition of Units of the Trust.
Fees and Expenses	Fees and Expenses
Incentive Fee (rebate)	Incentive Fee (rebate)
Service Fees	Service Fees Each Series is charged service fees as outlined above. In some cases, amounts paid to selling agents might be less than the amount charged to the Series. When this occurs, the service fee is rebated back to the investor in the form of additional units. During 2018, 2019 and 2020 the Series were not allowed to issue additional units. The Managing Owner has determined that the purchase of additional units of the relevant Series will commence in 2021 when the Series are allowed to sell shares again. As such, the Managing Owner has calculated the amounts for additional units of the relevant series which will be purchased and classified such amounts as Subscriptions in advance for service fee rebates of $22,650, $392, $31,725, $358,273, $20,378, $156,772 and $66,429 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively, as of June 30, 2021. These service fees are part of the offering costs of the Trust, with respect to the Series, which include registration and filing fees, legal and blue sky expenses, accounting and audit, printing, marketing support and other offering costs which are borne by the Managing Owner. With respect to the service fees, the initial service fee (for the first 12 months) relating to a purchase of Class 1 and Class 1a Units by an investor is prepaid by the Managing Owner to the relevant selling agent in the month following such purchase and is reimbursed for such payment by the Series monthly in arrears in an amount based upon a corresponding percentage of NAV, calculated daily. Consequently, the Managing Owner bears the risk of the downside and enjoys the benefit of the upside potential of any difference between the amount of the initial service fee prepaid by it and the amount of the reimbursement thereof, which may result from variations in NAV over the following 12 months.
Pending Owner Additions	Pending Owner Additions—
Owner redemptions payable	Owner redemptions payable—
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements—
Subsequent Events	Subsequent Events—The Series follow the provisions of ASC 855, Subsequent Events
Frontier Funds [Member]
Accounting Policies, by Policy (Policies) [Line Items]
Basis of Presentation	Basis of Presentation
Consolidation	Consolidation The income or loss attributable thereto in proportion of investment level is shown in the statements of operations as change in fair value of investments in unconsolidated Trading Companies or net unrealized gain/(loss) on private investment companies. The Trading Companies and Series of the Trust are consolidated by the Trust. All intercompany transactions have been eliminated in consolidation. Galaxy Plus entities are co-mingled investment vehicles. In addition to the Trust, there are other non-affiliated investors in Galaxy Plus entities. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Trust’s ownership percentage in Galaxy Plus entities. It is expected that ownership percentage will fluctuate (sometimes significantly) on a week by week basis which could also result in frequent changes in the consolidating Series. Such fluctuations make consolidating the financial statements of the Galaxy Plus entities both impractical and misleading. Non-consolidation of these Galaxy Plus entities presents a more useful financial statement for the readers. As such, management has decided that presenting Galaxy Plus entities on a non-consolidated basis as investments in other investments companies (a “fund of funds” approach) is appropriate and preferable to the users of these financial statements. Refer to Note 5 for additional disclosures related to these private investment companies.
Use of Estimates	Use of Estimates—
Cash and Cash Equivalents	Cash and Cash Equivalents—
Interest Income	Interest Income
U.S. Treasury Securities	U.S. Treasury Securities— Fair Value Measurements and Disclosures (“
Receivable from Futures Commission Merchants	Receivable from Futures Commission Merchants
Investment Transactions	Investment Transactions—Futures, options on futures, forward and swap contracts are recorded on a trade date basis and realized gains or losses are recognized when contracts are settled. Unrealized gains or losses on open contracts (the difference between contract trade price and market price) are reported in the consolidated statements of financial condition as a net unrealized gain or loss, as there exists a right of offset of unrealized gains or losses in accordance with FASB ASC 210, Balance Sheet (“ASC 210” Balance Sheet (Topic 210 Any change in net unrealized gain or loss from the preceding period is reported in the consolidated statements of operations. Fair value of exchange-traded contracts is based upon exchange settlement prices. Fair value of non-exchange-traded contracts is based on third party quoted dealer values on the interbank market. For U.S. Treasury securities, interest was recognized in the period earned and the instruments were marked-to-market daily based on third party information. Transaction costs are recognized as incurred and reflected separately in the consolidated statements of operations.
Purchase and Sales of Private Investment Companies	Purchase and Sales of Private Investment Companies
Foreign Currency Transactions	Foreign Currency Transactions—
Allocation of Earnings	Allocation of Earnings— Each Series allocates funds to an affiliated Trading Company, or Companies, of the Trust, or unaffiliated Galaxy Plus entity. Each Trading Company allocates all of its daily trading gains or losses to the Series in proportion to each Series’ ownership trading level interest in the Trading Company, adjusted on a daily basis (except for Trading Advisors and other investments such as swaps that are directly allocated to a specific series). Likewise, trading gains and losses earned and incurred by the Series through their investments in Galaxy Plus entities are allocated to those Series on a daily basis. The allocation of gains and losses in Galaxy Plus entities are based on each Series pro-rata shares of the trading level of that entity which is updated at the beginning of each month or more frequently if there is a subscription or redemption activity in the entity. The value of all open contracts and cash held at clearing brokers is similarly allocated to the Series in proportion to each Series’ funds allocated to the Trading Companies or Galaxy Plus entities.
Investments and Swaps	Investments and Swaps—
Income Taxes	Income Taxes In the opinion of the Managing Owner, (i) the Trust is treated as a partnership for Federal income tax purposes and, assuming that at least 90% of the gross income of the Trust constitutes “qualifying income” within the meaning of Section 7704(d) of the Code, (ii) the Trust is not a publicly traded partnership treated as a corporation, and (iii) the discussion set forth in the Prospectus under the heading “U.S. Federal Income Tax Consequences” correctly summarizes the material Federal income tax consequences as of the date of the Prospectus to potential U.S. Limited Owners of the purchase, ownership and disposition of Series Units of the Trust.
Fees and Expenses	Fees and Expenses—
Incentive Fee (rebate)	Incentive Fee (rebate)—
Service Fees	Service Fees Each Series is charged service fees as outlined above. In some cases, amounts paid to selling agents might be less than the amount charged to the Series. When this occurs, the service fee is rebated back to the investor in the form of additional units. During 2020, 2019 and 2018, the Series were not allowed to issue additional units. The Managing Owner has determined that the purchase of additional units of the relevant Series will commence in 2021 when the Series are allowed to sell shares again. As such, the Managing Owner has calculated the amounts for additional units of the relevant series which will be purchased and classified such amounts as Subscriptions in advance for service fee rebates of $656,619 and $638,962 as of June 30, 2021 and December 31, 2020, respectively. These service fees are part of the offering costs of the Trust, which include registration and filing fees, legal and blue1 sky expenses, accounting and audit, printing, marketing support and other offering costs which are borne by the Managing Owner. With respect to the service fees, the initial service fee (for the first 12 months) relating to a purchase of Class 1 and Class 1a Units by an investor is prepaid by the Managing Owner to the relevant selling agent in the month following such purchase and is reimbursed for such payment by the Series monthly in arrears in an amount based upon a corresponding percentage of NAV, calculated daily. Consequently, the Managing Owner bears the risk of the downside and enjoys the benefit of the upside potential of any difference between the amount of the initial service fee prepaid by it and the amount of the reimbursement thereof, which may result from variations in NAV over the following 12 months.
Pending Owner Additions	Pending Owner Additions—
Owner redemptions payable	Owner redemptions payable—
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements—
Subsequent Events	Subsequent Events Subsequent Events

Schedules of Investments (Table

Schedules of Investments (Tables)	6 Months Ended
	Jun. 30, 2021
Condensed Financial Information Disclosure [Abstract]
Schedule of investment companies	Frontier Frontier Frontier Diversified Fund Masters Fund Long/Short Commodity Fund Fair % of Total Capital Fair % of Total Capital Fair % of Total Capital Description Value (Net Asset Value) Value (Net Asset Value) Value (Net Asset Value) PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 957,311 28.08 % $ - 0.00 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 190,967 5.60 % - 0.00 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 615,570 18.06 % - 0.00 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 674,082 19.77 % 324,005 40.11 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 472,188 13.85 % 237,946 29.46 % 522,927 37.02 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC 312,873 9.18 % 205,197 25.40 % - 0.00 % Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC - 0.00 % - 0.00 % 281,563 19.93 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC - 0.00 % - 0.00 % 476,157 33.71 % Total Private Investment Companies $ 3,222,991 94.54 % $ 767,148 94.97 % $ 1,280,647 90.66 % INVESTMENT IN UNCONSOLIDATED TRADING COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 16,682 0.49 % $ 5,846 0.72 % $ 10,331 0.73 % Total Investment in Unconsolidated Trading Companies $ 16,682 0.49 % $ 5,846 0.72 % $ 10,331 0.73 % U.S. TREASURY SECURITIES (2) Fair Value Fair Value Fair Value $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 186,482 5.47 % $ 65,347 8.09 % $ 115,492 8.18 % $ 186,482 5.47 % $ 65,347 8.09 % $ 115,492 8.18 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 149,102 $ 52,248 $ 92,341 $ 149,102 $ 52,248 $ 92,341 Additional Disclosure on U.S. Treasury Securities Cost Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 187,918 $ 65,850 $ 116,381 $ 187,918 $ 65,850 $ 116,381 Frontier Global Fund Frontier Heritage Fund % of Total % of Total Description Fair (Net Asset Fair (Net Asset PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ 2,846,614 102.36 % $ 1,559,439 61.26 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC - 0.00 % 951,861 37.39 % Total Private Investment Companies $ 2,846,614 102.36 % $ 2,511,300 98.65 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 8,406 0.30 % $ 10,083 0.40 % Total Investment in Unconsolidated Trading Companies $ 8,406 0.30 % $ 10,083 0.40 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 93,971 3.38 % $ 112,721 4.43 % $ 93,971 3.38 % $ 112,721 4.43 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 75,135 $ 90,126 $ 75,135 $ 90,126 Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 94,695 $ 113,589 $ 94,695 $ 113,589 Frontier Frontier Frontier Diversified Fund Masters Fund Long/Short Commodity Fund % of Total % of Total % of Total Description Fair (Net Asset Fair (Net Asset Fair (Net Asset PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 1,066,074 25.49 % $ - 0.00 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 414,692 9.91 % - 0.00 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 672,766 16.08 % - 0.00 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 732,066 17.50 % 486,659 48.98 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 435,119 10.40 % 258,609 26.03 % 272,294 20.73 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC 323,886 7.74 % 269,323 27.11 % - 0.00 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC - 0.00 % - 0.00 % 465,759 35.46 % Total Private Investment Companies $ 3,644,603 87.12 % $ 1,014,591 102.12 % $ 738,053 56.19 % INVESTMENT IN UNCONSOLIDATED TRADING COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 16,669 0.40 % $ 907 0.09 % $ 17,736 1.35 % Total Investment in Unconsolidated Trading Companies $ 16,669 0.40 % $ 907 0.09 % $ 17,736 1.35 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value Fair Value $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 427,393 10.22 % $ 23,245 2.34 % $ 454,738 34.63 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 328,604 $ 17,872 $ 349,629 Additional Disclosure on U.S. Treasury Securities Cost Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 427,509 $ 23,251 $ 454,862 Frontier Global Fund Frontier Heritage Fund % of Total % of Total Description Fair Value (Net Asset Fair Value (Net Asset PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ 3,068,656 104.71 % $ 1,539,331 64.53 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC - - 828,131 34.72 % Total Private Investment Companies $ 3,068,656 104.71 % $ 2,367,462 99.25 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 1,083 0.04 % $ 2,880 0.12 % Total Investment in Unconsolidated Trading Companies $ 1,083 0.04 % $ 2,880 0.12 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 27,742 0.95 % $ 73,847 3.10 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 21,330 $ 56,778 Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 27,750 $ 73,867 Fair % of Total Capital Value (Net Asset Value) PRIVATE INVESTMENT COMPANIES (2) Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) $ 281,563 1.20 % Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 3,197,727 13.68 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 993,772 4.25 % Galaxy Plus Fund - Quest Fit Feeder Fund (535) LLC 133,307 0.57 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 1,939,527 8.29 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 6,984,677 29.87 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 5,780,863 24.72 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 2,557,962 10.94 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC 476,157 2.04 % Total Private Investment Companies $ 22,345,555 95.56 % U.S. TREASURY SECURITIES FACE VALUE $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 1,490,213 6.37 % Total U.S. Treasury Securities $ 1,490,213 6.37 %
Schedule of futures contracts and investment companies	Frontier Balanced Fund Frontier Select Fund % of Total % of Total Description Fair (Net Asset Fair (Net Asset LONG FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ (811 ) -0.01 % $ - 0.00 % Various agriculture futures contracts (Europe) (2,477 ) -0.02 % - 0.00 % Various agriculture futures contracts (U.S.) (399 ) 0.00 % - 0.00 % Various base metals futures contracts (U.S.) (2,644 ) -0.02 % - 0.00 % Various currency futures contracts (Europe) (16,585 ) -0.15 % - 0.00 % Various currency futures contracts (Far East) 2,707 0.03 % - 0.00 % Various currency futures contracts (Latin America) 2,605 0.02 % - 0.00 % Various currency futures contracts (U.S.) (1,200 ) -0.01 % - 0.00 % Various energy futures contracts (U.S.) 14,670 0.14 % - 0.00 % Various interest rates futures contracts (Europe) (186,275 ) -1.72 % - 0.00 % Various interest rates futures contracts (Far East) (90 ) 0.00 % - 0.00 % Various interest rates futures contracts (U.S.) 3,438 0.03 % - 0.00 % Various precious metal futures contracts (U.S.) (12,366 ) -0.11 % - 0.00 % Various stock index futures contracts (Europe) (1,804 ) -0.02 % - 0.00 % Various stock index futures contracts (Far East) 166 0.00 % - 0.00 % Total Long Futures Contracts $ (201,065 ) -1.84 % $ - 0.00 % SHORT FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ 6,829 0.06 % $ - 0.00 % Various agriculture futures contracts (Europe) (1,009 ) -0.01 % - 0.00 % Various agriculture futures contracts (U.S.) 4,675 0.04 % - 0.00 % Various base metals futures contracts (U.S.) (2,038 ) -0.02 % - 0.00 % Various currency futures contracts (Europe) 9,569 0.09 % - 0.00 % Various currency futures contracts (Far East) (1,932 ) -0.02 % - 0.00 % Various currency futures contracts (Latin America) 895 0.01 % - 0.00 % Various energy futures contracts (U.S.) (770 ) -0.01 % - 0.00 % Various interest rates futures contracts (Europe) 118,204 1.09 % - 0.00 % Various interest rates futures contracts (U.S.) (4,906 ) -0.05 % - 0.00 % Various precious metal futures contracts (U.S.) (1,339 ) -0.01 % - 0.00 % Various stock index futures contracts (Europe) 1,455 0.01 % - 0.00 % Total Short Futures Contracts $ 129,633 1.18 % $ - 0.00 % Total Open Trade Equity (Deficit) $ (71,432 ) -0.66 % $ - 0.00 % PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 2,240,416 20.74 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 802,805 7.43 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 1,323,957 12.25 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 1,580,537 14.63 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 2,644,643 24.48 % 951,298 58.66 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC 1,384,082 12.81 % 655,810 40.44 % Total Private Investment Companies $ 9,976,440 92.34 % $ 1,607,108 99.10 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 78,686 0.73 % $ 3,273 0.20 % Total Investment in Unconsolidated Trading Companies $ 78,686 0.73 % $ 3,273 0.20 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,191,500 US Treasury Note 6.875% due 08/15/2025 (Cost $1,501,686) $ 879,612 8.14 % $ 36,588 2.26 % $ 879,612 8.14 % $ 36,588 2.26 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 703,294 $ 29,254 $ 703,294 $ 29,254 Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 886,384 $ 36,869 $ 886,384 $ 36,869 Frontier Balanced Fund Frontier Select Fund % of Total % of Total Description Fair Value (Net Asset Fair Value (Net Asset LONG FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ 72,005 0.59 % $ - 0.00 % Various agriculture futures contracts (Europe) 9,803 0.08 % - 0.00 % Various agriculture futures contracts (U.S.) 87,496 0.72 % - 0.00 % Various base metals futures contracts (U.S.) 22,858 0.19 % - 0.00 % Various currency futures contracts (Europe) 10,573 0.09 % - 0.00 % Various currency futures contracts (Latin America) 5,833 0.05 % - 0.00 % Various currency futures contracts (U.S.) (100 ) 0.00 % - 0.00 % Various interest rates futures contracts (Europe) 148,949 1.23 % - 0.00 % Various interest rates futures contracts (Far East) 2,882 0.02 % - 0.00 % Various interest rates futures contracts (U.S.) 2,438 0.02 % - 0.00 % Various precious metal futures contracts (U.S.) 28,625 0.24 % - 0.00 % Various soft futures contracts (U.S.) 52,349 0.43 % - 0.00 % Various stock index futures contracts (Far East) 5,312 0.04 % - - Total Long Futures Contracts $ 449,023 3.70 % $ - 0.00 % SHORT FUTURES CONTRACTS* Various agriculture futures contracts (Far East) $ (30,963 ) -0.26 % $ - 0.00 % Various agriculture futures contracts (Europe) (10,797 ) -0.09 % - 0.00 % Various agriculture futures contracts (U.S.) (92,738 ) -0.77 % - 0.00 % Various base metals futures contracts (U.S.) (10,289 ) -0.08 % - 0.00 % Various currency futures contracts (Europe) (10,381 ) -0.09 % - 0.00 % Various currency futures contracts (Latin America) 2,512 0.02 % - 0.00 % Various currency futures contracts (U.S.) 2,300 0.02 % - 0.00 % Various interest rates futures contracts (Europe) (127,832 ) -1.06 % - 0.00 % Various interest rates futures contracts (Far East) (2,482 ) -0.02 % - 0.00 % Various interest rates futures contracts (U.S.) 3,656 0.03 % - 0.00 % Various precious metal futures contracts (U.S.) (25,560 ) -0.21 % - 0.00 % Various soft futures contracts (U.S.) (42,669 ) -0.35 % - 0.00 % Various stock index futures contracts (Far East) (3,340 ) -0.03 % - 0.00 % Total Short Futures Contracts $ (348,583 ) -2.89 % $ - 0.00 % Total Open Trade Equity (Deficit) $ 100,440 0.81 % $ - 0.00 % PRIVATE INVESTMENT COMPANIES (3) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 2,311,240 19.08 % $ - 0.00 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 1,581,941 13.06 % - 0.00 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 982,020 8.11 % - 0.00 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 1,600,611 13.22 % - 0.00 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 2,612,336 21.57 % 956,968 57.89 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 1,440,104 11.89 % 681,697 41.24 % Total Private Investment Companies $ 10,528,252 86.93 % $ 1,638,665 99.13 % INVESTMENT IN UNCONSOLIDATED COMPANIES (3) Frontier Trading Company XXXVIII, LLC $ 49,755 0.41 % $ - 0.00 % Total Investment in Unconsolidated Trading Companies $ 49,755 0.41 % $ - 0.00 % U.S. TREASURY SECURITIES (2) FACE VALUE Fair Value Fair Value $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 1,275,641 10.53 % $ - 0.00 % Additional Disclosure on U.S. Treasury Securities Face Value Face Value US Treasury Note 6.875% due 08/15/2025 (2) $ 980,787 $ - Additional Disclosure on U.S. Treasury Securities Cost Cost US Treasury Note 6.875% due 08/15/2025 (2) $ 1,275,989 $ - Fair % of Total Capital Description Value (Net Asset Value) LONG FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ (811 ) 0.00 % Various agriculture futures contracts (Europe) (2,477 ) -0.01 % Various agriculture futures contracts (U.S.) (399 ) 0.00 % Various base metals futures contracts (U.S.) (2,644 ) -0.01 % Various currency futures contracts (Europe) (16,585 ) -0.07 % Various currency futures contracts (Far East) 2,707 0.01 % Various currency futures contracts (Latin America) 2,605 0.01 % Various currency futures contracts (U.S.) (1,200 ) -0.01 % Various energy futures contracts (U.S.) 14,670 0.06 % Various interest rates futures contracts (Europe) (186,275 ) -0.80 % Various interest rates futures contracts (Far East) (90 ) 0.00 % Various interest rates futures contracts (U.S.) 3,438 0.01 % Various precious metal futures contracts (U.S.) (12,366 ) -0.05 % Various stock index futures contracts (Europe) (1,804 ) -0.01 % Various stock index futures contracts (Far East) 166 0.00 % Total Long Futures Contracts $ (201,065 ) -0.87 % SHORT FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ 6,829 0.03 % Various agriculture futures contracts (Europe) (1,009 ) 0.00 % Various agriculture futures contracts (U.S.) 4,675 0.02 % Various base metals futures contracts (U.S.) (2,038 ) -0.01 % Various currency futures contracts (Europe) 9,569 0.04 % Various currency futures contracts (Far East) (1,932 ) -0.01 % Various currency futures contracts (Latin America) 895 0.00 % Various energy futures contracts (U.S.) (770 ) 0.00 % Various interest rates futures contracts (Europe) 118,204 0.51 % Various interest rates futures contracts (U.S.) (4,906 ) -0.02 % Various precious metal futures contracts (U.S.) (1,339 ) -0.01 % Various stock index futures contracts (Europe) 1,455 0.01 % Total Short Futures Contracts $ 129,633 0.56 % Total Open Trade Equity (Deficit) $ (71,432 ) -0.31 % Fair % of Total Capital Description Value (Net Asset Value) LONG FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ 72,005 0.28 % Various agriculture futures contracts (Europe) 9,803 0.04 % Various agriculture futures contracts (U.S.) 87,496 0.34 % Various base metals futures contracts (U.S.) 22,858 0.09 % Various currency futures contracts (U.S.) (100 ) 0.00 % Various currency futures contracts (Europe) 10,573 0.04 % Various currency futures contracts (Latin America) 5,833 0.02 % Various interest rates futures contracts (Europe) 148,949 0.58 % Various interest rates futures contracts (Far East) 2,882 0.01 % Various interest rates futures contracts (U.S.) 2,438 0.01 % Various precious metal futures contracts (U.S.) 28,625 0.11 % Various soft futures contracts (U.S.) 52,349 0.20 % Various stock index futures contracts (Far East) 5,312 0.02 % Total Long Futures Contracts $ 449,023 1.74 % SHORT FUTURES CONTRACTS * Various agriculture futures contracts (Far East) $ (30,963 ) -0.12 % Various agriculture futures contracts (Europe) (10,797 ) -0.04 % Various agriculture futures contracts (U.S.) (92,738 ) -0.36 % Various base metals futures contracts (U.S.) (10,289 ) -0.04 % Various currency futures contracts (U.S.) 2,300 0.01 % Various currency futures contracts (Europe) (10,381 ) -0.04 % Various currency futures contracts (Latin America) 2,512 0.01 % Various interest rates futures contracts (Europe) (127,832 ) -0.50 % Various interest rates futures contracts (Far East) (2,482 ) -0.01 % Various interest rates futures contracts (U.S.) 3,656 0.01 % Various precious metal futures contracts (U.S.) (25,560 ) -0.10 % Various soft futures contracts (U.S.) (42,669 ) -0.17 % Various stock index futures contracts (Far East) (3,340 ) -0.01 % Total Short Futures Contracts $ (348,583 ) -1.36 % Total Open Trade Equity (Deficit) $ 100,440 0.38 % PRIVATE INVESTMENT COMPANIES (2) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC $ 3,377,314 13.21 % Galaxy Plus Fund - QIM Feeder Fund (526) LLC 1,996,633 7.81 % Galaxy Plus Fund - Quest Fit Feeder Fund (535) LLC 89,029 0.35 % Galaxy Plus Fund - Quest Feeder Fund (517) LLC 1,654,786 6.47 % Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 7,427,324 29.05 % Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 5,363,456 20.98 % Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 2,715,008 10.62 % Galaxy Plus Fund - LRR Feeder Fund (522) LLC 465,759 1.82 % Total Private Investment Companies $ 23,089,312 90.31 % U.S. TREASURY SECURITIES FACE VALUE $ 1,755,000 US Treasury Note 6.875% due 08/15/2025 (Cost $2,283,228) $ 2,282,606 8.93 % Total U.S. Treasury Securities $ 2,282,606 8.93 %

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Fair Value Measurements (Tables) [Line Items]
Schedule of financial asset portfolio measured at fair value	June 30, 2021 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies $ 16,682 $ - $ - $ 16,682 U.S. Treasury Securities 186,482 - - 186,482 Frontier Masters Fund Investment in Unconsolidated Trading Companies 5,846 - - 5,846 U.S. Treasury Securities 65,347 - - 65,347 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 10,331 - - 10,331 U.S. Treasury Securities 115,492 - - 115,492 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 78,686 - - 78,686 Open Trade Equity (Deficit) (71,432 ) - - (71,432 ) U.S. Treasury Securities 879,612 - - 879,612 Frontier Select Fund Investment in Unconsolidated Trading Companies 3,273 - - 3,273 U.S. Treasury Securities 36,588 - - 36,588 Frontier Global Fund Investment in Unconsolidated Trading Companies 8,406 - - 8,406 U.S. Treasury Securities 93,971 - - 93,971 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 10,083 - - 10,083 U.S. Treasury Securities 112,721 - - 112,721 December 31, 2020 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies $ 16,669 $ - $ - $ 16,669 U.S. Treasury Securities 427,393 - - 427,393 Frontier Masters Fund Investment in Unconsolidated Trading Companies 907 - - 907 U.S. Treasury Securities 23,245 - - 23,245 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 17,736 - - 17,736 U.S. Treasury Securities 454,738 - - 454,738 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 49,755 - - 49,755 Open Trade Equity (Deficit) 100,440 - - 100,440 U.S. Treasury Securities 1,275,641 - - 1,275,641 Frontier Global Fund Investment in Unconsolidated Trading Companies 1,083 - - 1,083 U.S. Treasury Securities 27,742 - - 27,742 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 2,880 - - 2,880 U.S. Treasury Securities 73,847 - - 73,847
Schedule of change in Level 3 assets measured at fair value on recurring basis	Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2020 $ 11,944,753 $ 362,521 Total gains or losses (realized/unrealized): Included in earnings-realized (2,448,166 ) 188,100 Included in earnings-unrealized (3,088,917 ) 44,277 Proceeds from collateral reduction (6,176,555 ) (115,000 ) Sale of investments (7,586,366 ) (594,898 ) Purchase of investments 7,355,251 115,000 Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2020 $ - $ - Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2020 $ 6,384,583 $ 2,888,009 Total gains or losses (realized/unrealized): Included in earnings-realized (446,306 ) (97,745 ) Included in earnings-unrealized (1,537,399 ) 197,829 Proceeds from collateral reduction (4,000,000 ) (2,474,937 ) Sale of investments (4,870,025 ) (1,491,965 ) Purchase of investments 4,469,147 978,809 Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2020 $ - $ - Frontier Balance of recurring Level 3 assets as of January 1, 2020 $ 479,024 Change in fair value of investments in unconsolidated trading companies 95,915 Proceeds from sales of investments of unconsolidated trading companies (574,939 ) Purchases of investments of unconsolidated trading companies - Change in ownership allocation - Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2020 $ -
Schedule of change in unrealized appreciation (depreciation)	Frontier Frontier Frontier Frontier Swap Contracts $ (1,537,399 ) $ 44,277 $ (3,088,917 ) $ 197,829 Frontier Investments in Unconsolidated Trading Companies $ (91,989 )
Frontier Funds [Member]
Fair Value Measurements (Tables) [Line Items]
Schedule of financial asset portfolio measured at fair value	June 30, 2021 Level 1 Inputs Level 2 Level 3 Total Open Trade Equity (Deficit) $ (71,432 ) $ - $ - $ (71,432 ) U.S. Treasury Securities 1,490,213 - - 1,490,213 December 31, 2020 Level 1 Inputs Level 2 Level 3 Total Open Trade Equity $ 100,440 $ - $ - $ 100,440 U.S. Treasury Securities 2,282,606 - - 2,282,606
Schedule of change in unrealized appreciation (depreciation)	For the Balance of recurring Level 3 assets as of January 1, 2020 $ 21,579,865 Total gains or losses (realized/unrealized): Included in earnings-realized (2,896,106 ) Included in earnings-unrealized (4,384,210 ) Proceeds from collateral reduction (12,674,502 ) Purchase of investments 12,918,207 Sale of investments (14,543,254 ) Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2020 $ -

Swap Contracts (Tables)

Swap Contracts (Tables)	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Swap Contracts (Tables) [Line Items]
Schedule of Investments in following swap	Frontier Frontier Frontier Frontier Total Total Total Total Counterparty Deutsche Deutsche Deutsche Deutsche Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 $ (97,745 ) Change in Unrealized Gain/(Loss) $ (3,088,917 ) $ (1,537,399 ) $ 44,277 $ 197,829 Fair Value as of December 31, 2020 $ 0 $ 0 $ 0 $ 0 Advance on swap appreciation $ 0 $ 0 $ 0 $ 0
Frontier Funds [Member]
Swap Contracts (Tables) [Line Items]
Schedule of Investments in following swap	XXXIV Balanced select swap XXXV Diversified select swap XXXVII L/S select swap Brevan Howard Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 $ (189,734 ) Change in Unrealized Gain/(Loss) $ (3,088,917 ) $ (1,537,399 ) $ 44,277 $ 197,829 Fair Value as of December 31, 2020 $ 0 $ 0 $ 0 $ 0 Advance on swap appreciation $ 0 $ 0 $ 0 $ 0

Investments in Unconsolidated_2

Investments in Unconsolidated Trading Companies and Private Investment Companies (Tables)	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Tables) [Line Items]
Schedule of investments in unconsolidated trading companies	As of June 30, 2021 As of December 31, 2020 Percentage of Percentage of Series Total Series Total Capital Capital Series Unconsolidated Fair Value Unconsolidated Fair Value Frontier Diversified Series — Frontier Trading Company XXXVIII 0.49 % $ 16,682 0.40 % $ 16,669 Frontier Masters Fund --- Frontier Trading Company XXXVIII 0.72 % $ 5,846 0.09 % $ 907 Frontier Long/Short Commodity Fund --- Frontier Trading Company XXXVIII 0.73 % $ 10,331 1.35 % $ 17,736 Frontier Balanced Fund --- Frontier Trading Company XXXVIII 0.73 % $ 78,686 0.41 % $ 49,755 Frontier Select Fund --- Frontier Trading Companies XXXVIII 0.20 % $ 3,273 0.00 % $ - Frontier Global Fund --- Frontier Trading Company XXXVIII 0.30 % $ 8,406 0.04 % $ 1,083 Frontier Heritage Fund --- Frontier Trading Company XXXVIII 0.40 % $ 10,083 0.12 % $ 2,880
Schedule of equity in earnings from unconsolidated trading companies and private investment companies	Three Months Ended June, 2021 Three Months Ended June, 2020 Change in Change in Trading Realized Unrealized Net Income Trading Realized Unrealized Net Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Frontier Balanced Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (8,036 ) $ (8,036 ) $ - $ - $ 13,836 $ 13,836 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (973 ) 51,102 52,345 102,474 (5,100 ) (88,960 ) (255,603 ) (349,663 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (433 ) - (433 ) (2,152 ) (49,427 ) 67,132 15,553 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 252 - 252 (6,408 ) (407,643 ) 414,194 143 Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (6,399 ) 197,477 51,803 242,881 (15,974 ) (403,362 ) 546,868 127,532 Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,910 ) - (1,910 ) (502 ) (239,751 ) 237,492 (2,761 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (2,902 ) (19,728 ) (174,263 ) (196,893 ) (8,555 ) (693,367 ) 349,783 (352,139 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (4,586 ) 68,282 (31,967 ) 31,729 (1,701 ) 79,790 (195,781 ) (117,692 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (14,466 ) 147,713 231,570 364,817 (12,641 ) 563,690 (927,823 ) (376,774 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (1,144 ) 72,781 (48,358 ) 23,279 - - - - Total $ (30,470 ) $ 515,536 $ 73,094 $ 558,160 $ (53,033 ) $ (1,239,030 ) $ 250,098 $ (1,041,965 ) Frontier Global Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (970 ) $ (970 ) $ - $ - $ 4,623 $ 4,623 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,816 ) 92,598 47,380 138,162 (8,398 ) (308,501 ) (328,301 ) (645,200 ) Total $ (1,816 ) $ 92,598 $ 46,410 $ 137,192 $ (8,398 ) $ (308,501 ) $ (323,678 ) $ (640,577 ) Frontier Select Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 148 $ 148 $ - $ - $ (143 ) $ (143 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - 387 - 387 - - (1,616 ) (1,616 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,951 ) 55,643 67,990 118,682 (4,125 ) 170,109 (288,624 ) (122,640 ) Galaxy Plus Fund - TT Feeder Fund (531) LLC - 864 - 864 (5,392 ) (220,692 ) 226,084 - Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (521 ) 24,894 (24,404 ) (29 ) - - - - Total $ (5,472 ) $ 81,788 $ 43,734 $ 120,052 $ (9,517 ) $ (50,583 ) $ (64,299 ) $ (124,399 ) Frontier Heritage Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 391 $ 391 $ - $ - $ 2,779 $ 2,779 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,086 ) 51,481 14,949 65,344 (2,774 ) (35,321 ) (179,266 ) (217,361 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,840 ) 55,770 61,982 112,910 (3,878 ) 211,068 (336,224 ) (129,034 ) Total $ (5,926 ) $ 107,251 $ 77,322 $ 178,645 $ (6,652 ) $ 175,747 $ (512,711 ) $ (343,616 ) Frontier Long/Short Commodity Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 785 $ 785 $ - $ - $ 1,630 $ 1,630 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 36 - 36 (938 ) (41,364 ) 42,301 (1 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (194 ) 102,498 (84,645 ) 17,659 (672 ) (117,782 ) 122,271 3,817 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,642 ) 30,095 32,587 60,040 (1,626 ) 83,251 (131,014 ) (49,389 ) Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) (2,701 ) 20,959 36,607 54,865 - - - - Total $ (5,537 ) $ 153,588 $ (14,666 ) $ 133,385 $ (3,236 ) $ (75,895 ) $ 35,188 $ (43,943 ) Frontier Diversified Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (4,774 ) $ (4,773 ) $ - $ - $ 4,032 $ 4,032 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (664 ) 23,903 32,380 55,619 (3,370 ) (56,966 ) (142,153 ) (202,489 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (245 ) - (245 ) (1,348 ) (29,090 ) 38,354 7,916 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 157 - 157 (4,119 ) (194,763 ) 198,882 - Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (2,921 ) 17,238 107,434 121,751 (11,130 ) (310,674 ) 377,368 55,564 Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,166 ) - (1,166 ) (309 ) (148,003 ) 146,562 (1,750 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (714 ) (4,694 ) (41,633 ) (47,041 ) (3,841 ) (190,864 ) 79,076 (115,629 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (2,332 ) 30,353 (4,431 ) 23,590 (1,514 ) 65,761 (153,963 ) (89,716 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,564 ) 28,323 38,099 63,858 (7,271 ) 382,640 (502,758 ) (127,389 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (260 ) 17,654 (12,705 ) 4,690 - - - - Total $ (9,455 ) $ 111,523 $ 114,370 $ 216,440 $ (32,902 ) $ (481,959 ) $ 45,400 $ (469,461 ) Frontier Masters Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (960 ) $ (960 ) $ - $ - $ 4,207 $ 4,207 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (419 ) 12,291 5,931 17,803 (2,049 ) (30,225 ) (132,672 ) (164,946 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (58 ) - (58 ) - - 88 88 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 52 - 52 (1,540 ) 58,199 (56,659 ) - Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (1,272 ) 13,150 20,093 31,971 (2,008 ) 117,030 (165,332 ) (50,310 ) Galaxy Plus Fund - TT Feeder Fund (531) LLC - 520 - 520 (1,851 ) (90,207 ) 92,058 - Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (172 ) 13,249 (13,886 ) (810 ) - - - - Total $ (1,863 ) $ 39,204 $ 11,178 $ 48,518 $ (7,448 ) $ 54,797 $ (258,310 ) $ (210,961 ) Six Months Ended June, 2021 Six Months Ended June, 2020 Change in Change in Trading Realized Unrealized Net Income Trading Realized Unrealized Net Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Frontier Balanced Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (22,317 ) $ (22,317 ) $ - $ - $ (9,465 ) $ (9,465 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (2,581 ) 156,170 59,479 213,068 (5,100 ) 12,484 4,697 12,081 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (433 ) - (433 ) (2,152 ) (55,735 ) 25,524 (32,363 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 252 - 252 (6,408 ) (718,397 ) 81,531 (643,274 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (13,166 ) 294,440 (159,281 ) 121,993 (15,974 ) (324,444 ) 189,882 (150,536 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,910 ) - (1,910 ) (502 ) (232,245 ) (21,665 ) (254,412 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (5,401 ) (203,111 ) (166,727 ) (375,239 ) (8,555 ) (667,819 ) 50,898 (625,476 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (8,909 ) 117,348 77,978 186,417 (1,701 ) 56,595 (28,862 ) 26,032 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (26,328 ) 813,419 156,670 943,761 (12,641 ) 596,931 (159,436 ) 424,854 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (2,084 ) (428,402 ) 346,244 (84,242 ) - - - - Total $ (58,469 ) $ 747,773 $ 292,046 $ 981,350 $ (53,033 ) $ (1,332,630 ) $ 133,104 $ (1,252,559 ) Frontier Global Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 15,163 $ 15,163 $ - $ - $ (454 ) $ (454 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (4,324 ) 265,492 6,828 267,996 (8,398 ) 1,157 (79,179 ) (86,420 ) Total $ (4,324 ) $ 265,492 $ 21,991 $ 283,159 $ (8,398 ) $ 1,157 $ (79,633 ) $ (86,874 ) Frontier Select Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 8,689 $ 8,689 $ - $ - $ (6,672 ) $ (6,672 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - 387 - 387 - - - - Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (8,448 ) 254,132 46,367 292,051 (4,125 ) 195,063 (1,616 ) 189,322 Galaxy Plus Fund - TT Feeder Fund (531) LLC - 864 - 864 (5,392 ) (237,723 ) (52,502 ) (295,617 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (913 ) (190,185 ) 142,152 (48,946 ) - - (32,990 ) (32,990 ) Total $ (9,361 ) $ 65,198 $ 197,208 $ 253,045 $ (9,517 ) $ (42,660 ) $ (93,780 ) $ (145,957 ) Frontier Heritage Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 13,018 $ 13,018 $ - $ - $ (3,324 ) $ (3,324 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (2,426 ) 145,165 (14,508 ) 128,231 (2,774 ) (1,359 ) (36,695 ) (40,828 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (7,964 ) 235,648 38,515 266,199 (3,878 ) 181,477 (62,681 ) 114,918 Total $ (10,390 ) $ 380,813 $ 37,025 $ 407,448 $ (6,652 ) $ 180,118 $ (102,700 ) $ 70,766 Frontier Long/Short Commodity Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 12,908 $ 12,908 $ - $ - $ (3,076 ) $ (3,076 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 36 - 36 (938 ) (103,100 ) 8,652 (95,386 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (423 ) 126,047 (102,977 ) 22,647 (672 ) (116,962 ) (15,470 ) (133,104 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,503 ) 135,810 19,696 151,003 (1,626 ) 76,796 (19,465 ) 55,705 Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) (4,509 ) 20,959 8,048 24,498 - - - - Total $ (9,435 ) $ 282,852 $ (62,325 ) $ 211,092 $ (3,236 ) $ (143,266 ) $ (29,359 ) $ (175,861 ) Frontier Diversified Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 5,472 $ 5,472 $ - $ - $ 3,023 $ 3,023 Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,417 ) 76,428 31,221 106,232 (3,370 ) 31,349 10,159 38,138 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (245 ) - (245 ) (1,348 ) (39,612 ) 17,676 (23,284 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 157 - 157 (4,119 ) (463,144 ) 53,938 (413,325 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (6,152 ) 64,786 12,197 70,831 (11,130 ) (201,658 ) 79,262 (133,526 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - (1,166 ) - (1,166 ) (309 ) (144,282 ) (12,689 ) (157,280 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (1,354 ) (50,866 ) (43,800 ) (96,020 ) (3,841 ) (244,235 ) 46,440 (201,636 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (5,095 ) 60,727 85,796 141,428 (1,514 ) 53,754 (19,897 ) 32,343 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (4,575 ) 139,192 32,643 167,260 (7,271 ) 376,073 (18,235 ) 350,567 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (479 ) (100,383 ) 81,334 (19,528 ) - - - - Total $ (19,072 ) $ 188,630 $ 204,863 $ 374,421 $ (32,902 ) $ (631,755 ) $ 159,677 $ (504,980 ) Frontier Masters Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 11,801 $ 11,801 $ - $ - $ (2,275 ) $ (2,275 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (772 ) 35,923 39 35,190 (2,049 ) (1,588 ) (28,072 ) (31,709 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (58 ) - (58 ) - - 88 88 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 52 - 52 (1,540 ) (190,409 ) 31,680 (160,269 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,334 ) 73,498 12,361 83,525 (2,008 ) 95,916 (9,097 ) 84,811 Galaxy Plus Fund - TT Feeder Fund (531) LLC - 520 - 520 (1,851 ) (84,259 ) (10,422 ) (96,532 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (328 ) (70,291 ) 47,892 (22,727 ) - - - - Total $ (3,434 ) $ 39,644 $ 72,093 $ 108,303 $ (7,448 ) $ (180,340 ) $ (18,098 ) $ (205,886 )
Schedule of private investment companies have certain redemption and liquidity restrictions	Redemptions Redemptions Liquidity Notice Period Permitted Restrictions Frontier Diversified Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 24 hours Daily None Galaxy Plus Fund - QIM Feeder Fund (526) LLC 24 hours Daily None Galaxy Plus Fund - Quest Feeder Fund (517) LLC 24 hours Daily None Frontier Masters Fund Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Weekly None Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Frontier Long/Short Commodity Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) 24 hours Daily None Frontier Balanced Fund Multi-Strategy Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 24 hours Daily None Galaxy Plus Fund - QIM Feeder Fund (526) LLC 24 hours Daily None Galaxy Plus Fund - Quest Feeder Fund (517) LLC 24 hours Daily None Frontier Select Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Frontier Global Fund Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Frontier Heritage Fund Multi-Strategy Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None
Frontier Funds [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Tables) [Line Items]
Schedule of equity in earnings from unconsolidated trading companies and private investment companies	Three Months Ended June, 2021 Three Months Ended June, 2020 Trading Realized Change in Net Income Trading Realized Change in Net Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ (4,958 ) $ 231,375 $ 152,986 $ 379,403 $ (21,691 ) $ (519,973 ) $ (1,037,995 ) $ (1,579,659 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (349 ) - (349 ) (3,500 ) (78,517 ) 103,958 21,941 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 497 - 497 (13,005 ) (585,571 ) 598,718 142 Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (9,320 ) 214,715 159,237 364,632 (27,104 ) (714,036 ) 924,235 183,095 Galaxy Plus Fund - LRR Feeder Fund (522) LLC (194 ) 99,422 (84,645 ) 14,583 (1,483 ) (505,536 ) 506,325 (694 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (3,616 ) (24,422 ) (215,896 ) (243,934 ) (12,396 ) (884,231 ) 428,859 (467,768 ) Galaxy Plus Fund - Quantmetrics Feeder Fund (527) LLC - - - - - - - - Galaxy Plus Fund - Quest Feeder Fund (517) LLC (6,918 ) 98,635 (36,398 ) 55,319 (3,215 ) 145,551 (349,745 ) (207,409 ) Galaxy Plus Fund - Quest FIT Feeder Fund (535) LLC - - (13,415 ) (13,415 ) - - - - Galaxy Plus Fund - TT Feeder Fund (531) LLC - 1,384 - 1,384 (7,243 ) (310,899 ) 318,142 - Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (30,735 ) 330,694 452,321 752,280 (31,549 ) 1,527,788 (2,351,775 ) (855,536 ) Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) (2,097 ) 128,578 (99,354 ) 27,127 - - - - Galaxy Plus Fund - Volt Diversified Alpha Feeder Fund (550) LLC) (2,701 ) 20,959 36,607 54,865 - - - - Total $ (60,539 ) $ 1,101,488 351,443 1,392,392 $ (121,186 ) $ (1,925,424 ) $ (859,278 ) $ (2,905,888 ) Six Months Ended June, 2021 Six Months Ended June, 2020 Trading Commissions Realized Gain/(Loss) Change in Unrealized Gain/(Loss) Net Income (Loss) Trading Commissions Realized Gain/(Loss) Change in Unrealized Gain/(Loss) Net Income (Loss) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC $ (11,520 ) $ 679,178 $ 83,059 $ 750,717 $ (21,691 ) $ 42,043 $ (129,090 ) $ (108,738 ) Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - (349 ) - (349 ) (3,500 ) (95,347 ) 41,672 (57,175 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - 497 - 497 (13,005 ) (1,475,050 ) 175,801 (1,312,254 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (19,318 ) 359,226 (147,084 ) 192,824 (27,104 ) (526,102 ) 269,144 (284,062 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (423 ) 122,971 (102,977 ) 19,571 (1,483 ) (493,489 ) (49,824 ) (544,796 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (6,755 ) (253,977 ) (210,527 ) (471,259 ) (12,396 ) (912,054 ) 97,338 (827,112 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (14,004 ) 178,075 163,774 327,844 (3,215 ) 110,349 (48,759 ) 58,375 Galaxy Plus Fund - Quest FIT Feeder Fund (535) LLC - - 44,734 44,734 - - - - Galaxy Plus Fund - TT Feeder Fund (531) LLC - 1,384 - 1,384 (7,243 ) (321,982 ) (43,412 ) (372,637 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (54,152 ) 1,651,699 306,252 1,903,799 (31,549 ) 1,522,256 (321,416 ) 1,169,291 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC (3,804 ) (789,261 ) 617,622 (175,443 ) - - - - Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC (4,509 ) 20,959 8,048 24,499 - - - - Total $ (114,485 ) $ 1,970,402 $ 762,901 $ 2,618,818 $ (121,186 ) $ (2,149,376 ) $ (8,546 ) $ (2,279,108 )
Schedule of private investment companies have certain redemption and liquidity restrictions	Redemptions Redemptions Liquidity Notice Period Permitted Restrictions Frontier Funds Multi-Strategy Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC 24 hours Daily None Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None Galaxy Plus Fund - Volt Diversified Alpha Feeder Fund (550) LLC 24 hours Daily None Trend Following Galaxy Plus Fund - Aspect Feeder Fund (532) LLC 24 hours Daily None Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC 24 hours Daily None Galaxy Plus Fund - QIM Feeder Fund (526) LLC 24 hours Daily None Galaxy Plus Fund - Quest Feeder Fund (517) LLC 24 hours Daily None

Transactions with Affiliates (T

Transactions with Affiliates (Tables)	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Transactions with Affiliates (Tables) [Line Items]
Schedule of fees earned by managing owner	Incentive (Rebate) Management Service Trading Three Months Ended June 30, 2021 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 501 $ 33,037 Frontier Masters Fund - - 147 13,305 Frontier Long/Short Commodity Fund - - 58 10,050 Frontier Balanced Fund - 4,595 65,729 109,550 Frontier Select Fund - - 11,804 12,010 Frontier Global Fund - - 20,452 37,220 Frontier Heritage Fund - - 17,745 25,996 Incentive (Rebate) Management Service Trading Three Months Ended June 30, 2020 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 2,943 $ 57,135 Frontier Masters Fund - - 499 29,246 Frontier Long/Short Commodity Fund - - 111 7,765 Frontier Balanced Fund - 4,704 85,674 138,508 Frontier Select Fund - - 17,932 15,445 Frontier Global Fund - - 27,786 52,118 Frontier Heritage Fund - - 17,944 28,037 Incentive (Rebate) Management Service Trading Six Months Ended June 30, 2021 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 1,550 $ 67,974 Frontier Masters Fund - - 357 28,168 Frontier Long/Short Commodity Fund - - 112 18,815 Frontier Balanced Fund 49,840 9,214 132,996 223,989 Frontier Select Fund - - 23,242 23,365 Frontier Global Fund - - 40,390 72,350 Frontier Heritage Fund - - 33,902 49,672 Incentive (Rebate) Management Service Trading Six Months Ended June 30, 2020 Fees Fee Fee Fee Frontier Diversified Fund $ - $ - $ 10,650 $ 157,685 Frontier Masters Fund - - 1,094 61,645 Frontier Long/Short Commodity Fund - - 222 17,312 Frontier Balanced Fund - 9,724 210,982 223,989 Frontier Select Fund - - 38,092 32,400 Frontier Global Fund - - 58,227 107,673 Frontier Heritage Fund - - 35,957 57,942
Schedule of fees payable to managing owner	Incentive Management Interest Service Trading As of June 30, 2021 Fees Fees Fees Fees Fees Frontier Diversified Fund $ - $ - $ - $ 158 $ 10,587 Frontier Masters Fund - - - 47 4,440 Frontier Long/Short Commodity Fund - - 37 20 3,492 Frontier Balanced Fund - 1,511 1,870 19,481 36,556 Frontier Select Fund - - 107 3,707 4,110 Frontier Global Fund - - 232 6,307 12,632 Frontier Heritage Fund - - 235 5,306 8,987 Incentive Management Interest Service Trading As of December 31, 2020 Fees Fees Fees Fees Fees Frontier Diversified Fund $ - $ - $ - $ 385 $ 12,576 Frontier Masters Fund - - - 70 5,460 Frontier Long/Short Commodity Fund - - 87 18 2,281 Frontier Balanced Fund - 8,854 1,376 21,381 37,894 Frontier Select Fund - - 179 3,709 3,933 Frontier Global Fund - - 326 6,348 11,849 Frontier Heritage Fund - - 139 4,794 7,705
Series of Frontier Funds [Member]
Transactions with Affiliates (Tables) [Line Items]
Schedule of interest paid by each series to managing owner	Three Months Ended June 30, June 30, June 30, June 30, Gross Amount Gross Amount Ratio to Average Ratio to Average Frontier Diversified Fund Class 1 $ - $ - 0.00 % 0.00 % Frontier Diversified Fund Class 2 - - 0.00 % 0.00 % Frontier Diversified Fund Class 3 - - 0.00 % 0.00 % Frontier Masters Fund Class 1 - - 0.00 % 0.00 % Frontier Masters Fund Class 2 - - 0.00 % 0.00 % Frontier Masters Fund Class 3 - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2 7 5 0.02 % 0.01 % Frontier Long/Short Commodity Fund Class 3 181 114 0.02 % 0.01 % Frontier Long/Short Commodity Fund Class 1a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 3a - - 0.00 % 0.00 % Frontier Balanced Fund Class 1 3,247 2,221 0.04 % 0.01 % Frontier Balanced Fund Class 1AP 44 31 0.04 % 0.01 % Frontier Balanced Fund Class 2 649 425 0.04 % 0.01 % Frontier Balanced Fund Class 2a 7 5 0.01 % 0.00 % Frontier Balanced Fund Class 3a 39 23 0.01 % 0.00 % Frontier Select Fund Class 1 778 779 0.05 % 0.03 % Frontier Select Fund Class 1AP 5 3 0.05 % 0.03 % Frontier Select Fund Class 2 37 26 0.05 % 0.03 % Frontier Global Fund Class 1 649 1,203 0.02 % 0.03 % Frontier Global Fund Class 1AP - 11 0.00 % 0.03 % Frontier Global Fund Class 2 49 110 0.02 % 0.03 % Frontier Heritage Fund Class 1 1,010 728 0.04 % 0.03 % Frontier Heritage Fund Class 1AP 4 3 0.05 % 0.03 % Frontier Heritage Fund Class 2 103 170 0.04 % 0.03 % Total $ 6,809 $ 5,857 Six months ended June 30, June 30, June 30, June 30, Gross Amount Gross Amount Ratio to Average Ratio to Average Frontier Diversified Fund Class 1 $ - $ - 0.00 % 0.00 % Frontier Diversified Fund Class 2 - - 0.00 % 0.00 % Frontier Diversified Fund Class 3 - - 0.00 % 0.00 % Frontier Masters Fund Class 1 - - 0.00 % 0.00 % Frontier Masters Fund Class 2 - - 0.00 % 0.00 % Frontier Masters Fund Class 3 - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2 14 8 0.04 % 0.02 % Frontier Long/Short Commodity Fund Class 3 408 196 0.04 % 0.02 % Frontier Long/Short Commodity Fund Class 1a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2a - - 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 3a - - 0.00 % 0.00 % Frontier Balanced Fund Class 1 3,547 4,400 0.04 % 0.03 % Frontier Balanced Fund Class 1AP 47 62 0.04 % 0.03 % Frontier Balanced Fund Class 2 719 859 0.04 % 0.03 % Frontier Balanced Fund Class 2a 7 10 0.01 % 0.01 % Frontier Balanced Fund Class 3a 42 46 0.01 % 0.01 % Frontier Select Fund Class 1 1,568 1,733 0.10 % 0.07 % Frontier Select Fund Class 1AP 10 7 0.10 % 0.06 % Frontier Select Fund Class 2 72 58 0.10 % 0.07 % Frontier Global Fund Class 1 2,104 1,748 0.08 % 0.04 % Frontier Global Fund Class 1AP - 16 0.00 % 0.05 % Frontier Global Fund Class 2 152 151 0.08 % 0.05 % Frontier Heritage Fund Class 1 2,048 1,648 0.09 % 0.07 % Frontier Heritage Fund Class 1AP 8 6 0.09 % 0.07 % Frontier Heritage Fund Class 2 207 388 0.09 % 0.07 % Total $ 10,953 $ 11,336

Financial Highlights (Tables)

Financial Highlights (Tables)	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Financial Highlights (Tables) [Line Items]
Schedule of financial highlights of trust	Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, March 31, 2021 $ 74.62 $ 91.71 $ 85.97 $ 57.44 $ 70.61 $ 66.45 $ 90.39 $ 58.49 $ 94.82 $ 61.77 Net operating results: Interest income 0.00 0.00 0.00 0.07 0.08 0.08 0.07 0.05 0.07 0.05 Expenses (1.61 ) (0.90 ) (0.84 ) (1.73 ) (1.16 ) (1.09 ) (0.70 ) (0.45 ) (0.73 ) (0.48 ) Net gain/(loss) on investments, net of non-controlling interests 4.67 5.09 4.82 (55.78 )* 3.99 3.79 8.73 5.65 9.16 6.02 Net income/(loss) 3.06 4.19 3.98 (57.44 )* 2.91 2.78 8.10 5.25 8.50 5.59 Net asset value, June 30, 2021 $ 77.68 $ 95.90 $ 89.95 $ - * $ 73.52 $ 69.23 $ 98.49 $ 63.74 $ 103.32 $ 67.36 Ratios to average net assets Net investment income/(loss) -8.20 % -3.71 % -3.71 % -11.62 % -5.83 % -5.83 % -2.53 % -2.53 % -2.53 % -2.53 % Expenses before incentive fees (3)(4) 8.20 % 3.71 % 3.71 % 12.07 % 6.28 % 6.28 % 2.81 % 2.81 % 2.81 % 2.81 % Expenses after incentive fees (3)(4) 8.20 % 3.71 % 3.71 % 12.07 % 6.28 % 6.28 % 2.81 % 2.81 % 2.81 % 2.81 % Total return before incentive fees (2) 4.10 % 4.57 % 4.63 % 0.47 %* 4.12 % 4.18 % 8.96 % 8.98 % 8.96 % 9.05 % Total return after incentive fees (2) 4.10 % 4.57 % 4.63 % 0.47 %* 4.12 % 4.18 % 8.96 % 8.98 % 8.96 % 9.05 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2021 $ 83.39 $ 101.75 $ 137.21 $ 118.98 $ 118.58 $ 62.56 $ 76.41 $ 101.40 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (1.54 ) (1.10 ) (1.48 ) (1.28 ) (1.28 ) (0.96 ) (0.58 ) (0.77 ) Net gain/(loss) on investments, net of non-controlling interests 4.01 4.90 6.61 5.77 5.75 4.57 5.61 7.44 Net income/(loss) 2.47 3.80 5.13 4.49 4.47 3.61 5.03 6.67 Net asset value, June 30, 2021 $ 85.86 $ 105.55 $ 142.34 $ 123.47 $ 123.05 $ 66.17 $ 81.44 $ 108.07 Ratios to average net assets Net investment income/(loss) -7.11 % -4.11 % -4.11 % -4.11 % -4.11 % -5.91 % -2.90 % -2.90 % Expenses before incentive fees (3)(4) 7.12 % 4.11 % 4.11 % 4.11 % 4.11 % 5.91 % 2.90 % 2.90 % Expenses after incentive fees (3)(4) 7.12 % 4.11 % 4.11 % 4.11 % 4.11 % 5.91 % 2.90 % 2.90 % Total return before incentive fees (2) 2.96 % 3.73 % 3.74 % 3.77 % 3.77 % 5.77 % 6.58 % 6.58 % Total return after incentive fees (2) 2.96 % 3.73 % 3.74 % 3.77 % 3.77 % 5.77 % 6.58 % 6.58 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2021 $ 114.32 $ 174.01 $ 103.77 $ 126.74 $ 169.62 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 Expenses (2.45 ) (2.36 ) (1.93 ) (1.35 ) (1.81 ) Net gain/(loss) on investments, net of non-controlling interests 5.41 8.20 7.42 9.06 12.12 Net income/(loss) 2.96 5.84 5.49 7.71 10.31 Net asset value, June 30, 2021 $ 117.28 $ 179.85 $ 109.26 $ 134.45 $ 179.93 Ratios to average net assets Net investment income/(loss) -8.09 % -5.09 % -6.98 % -3.98 % -3.98 % Expenses before incentive fees (3)(4) 8.09 % 5.09 % 6.98 % 3.98 % 3.98 % Expenses after incentive fees (3)(4) 8.09 % 5.09 % 6.98 % 3.98 % 3.98 % Total return before incentive fees (2) 2.59 % 3.36 % 5.29 % 6.08 % 6.08 % Total return after incentive fees (2) 2.59 % 3.36 % 5.29 % 6.08 % 6.08 % (1) Interest income and expenses per unit are calculated by dividing these amounts by the average number of units outstanding during the period. The net gain/(loss) on investments, net of non-controlling interests is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information. (2) Impact of incentive fee computed using average net assets, otherwise computed using average units outstanding during the period prior to the effects of any non-controlling transactions. An owner’s total returns may vary from the above returns based on the timing of contributions and withdrawals. Total returns are not annualized. (3) Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Statements of Operations of the Series, see footnote 6. (4) Expense ratios do not include management and incentive fees at the Galaxy Plus entities. The ratios would have been higher had those expenses been included. The impact of those fees are included in the total return. Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 1a Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, March 31, 2020 $ 79.15 $ 95.60 $ 89.39 $ 71.34 $ 86.18 $ 80.89 $ 47.69 $ 88.66 $ 56.98 $ 93.01 $ 60.02 Net operating results: Interest income 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.03 0.02 0.03 0.02 Expenses (0.85 ) (0.63 ) (0.58 ) (3.81 ) (1.19 ) (1.12 ) (0.69 ) (0.48 ) (0.31 ) (0.51 ) (0.33 ) Net gain/(loss) on investments, net of non-controlling interests (4.22 ) (5.09 ) (4.72 ) (5.63 ) (9.89 ) (9.23 ) (2.45 ) (4.94 ) (3.21 ) (5.18 ) (3.33 ) Net income/(loss) (5.06 ) (5.72 ) (5.30 ) (9.42 ) (11.05 ) (10.33 ) (3.12 ) (5.39 ) (3.50 ) (5.66 ) (3.64 ) Net asset value, June 30, 2020 $ 74.09 $ 89.88 $ 84.09 $ 61.92 $ 75.13 $ 70.56 $ 44.58 $ 83.27 $ 53.49 $ 87.35 $ 56.38 Ratios to average net assets Net investment income/(loss) -3.38 % -2.07 % -2.07 % -21.01 % -5.36 % -5.36 % -5.96 % -2.17 % -2.17 % -2.17 % -2.17 % Expenses before incentive fees (3)(4) 3.41 % 2.10 % 2.10 % 21.10 % 5.45 % 5.45 % 6.10 % 2.31 % 2.31 % 2.31 % 2.31 % Expenses after incentive fees (3)(4) 3.41 % 2.10 % 2.10 % 21.10 % 5.45 % 5.45 % 6.10 % 2.31 % 2.31 % 2.31 % 2.31 % Total return before incentive fees (2) -6.39 % -5.98 % -5.93 % -13.21 % -12.83 % -12.77 % -6.55 % -6.08 % -6.14 % -6.08 % -6.06 % Total return after incentive fees (2) -6.39 % -5.98 % -5.93 % -13.21 % -12.83 % -12.77 % -6.55 % -6.08 % -6.14 % -6.08 % -6.06 % Incentive fee per share - - - - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2020 $ 86.02 $ 101.87 $ 137.37 $ 119.07 $ 118.66 $ 67.48 $ 79.99 $ 106.15 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (1.35 ) (0.90 ) (17.96 ) (1.06 ) (1.05 ) (0.83 ) (0.45 ) (0.59 ) Net gain/(loss) on investments, net of non-controlling interests (6.09 ) (7.21 ) 7.02 (8.40 ) (8.37 ) (5.60 ) (6.64 ) (8.81 ) Net income/(loss) (7.43 ) (8.11 ) (10.93 ) (9.46 ) (9.42 ) (6.44 ) (7.09 ) (9.40 ) Net asset value, June 30, 2020 $ 78.59 $ 93.76 $ 126.44 $ 109.61 $ 109.24 $ 61.04 $ 72.90 $ 96.75 Ratios to average net assets Net investment income/(loss) -4.77 % -2.72 % -2.72 % -2.72 % -2.72 % -4.89 % -2.22 % -2.22 % Expenses before incentive fees (3)(4) 4.77 % 2.72 % 2.72 % 2.72 % 2.72 % 4.89 % 2.22 % 2.22 % Expenses after incentive fees (3)(4) 4.77 % 2.72 % 2.72 % 2.72 % 2.72 % 4.89 % 2.22 % 2.22 % Total return before incentive fees (2) -8.64 % -7.96 % -7.96 % -7.94 % -7.94 % -9.54 % -8.86 % -8.86 % Total return after incentive fees (2) -8.64 % -7.96 % -7.96 % -7.94 % -7.94 % -9.54 % -8.86 % -8.86 % Incentive fee per share - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 1AP Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, March 31, 2020 $ 145.97 $ 173.08 $ 215.64 $ 114.21 $ 135.37 $ 181.17 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (2.53 ) (1.89 ) (2.36 ) (1.76 ) (1.16 ) (1.55 ) Net gain/(loss) on investments, net of non-controlling interests (21.76 ) (25.83 ) (32.19 ) (15.94 ) (18.96 ) (25.38 ) Net income/(loss) (24.29 ) (27.73 ) (34.55 ) (17.70 ) (20.12 ) (26.93 ) Net asset value, June 30, 2020 $ 121.68 $ 145.35 $ 181.09 $ 96.51 $ 115.25 $ 154.24 Ratios to average net assets Net investment income/(loss) -7.44 % -4.70 % -4.70 % -6.79 % -3.79 % -3.79 % Expenses before incentive fees (3)(4) 7.44 % 4.70 % 4.70 % 6.79 % 3.79 % 3.79 % Expenses after incentive fees (3)(4) 7.44 % 4.70 % 4.70 % 6.79 % 3.79 % 3.79 % Total return before incentive fees (2) -16.64 % -16.02 % -16.02 % -15.50 % -14.87 % -14.87 % Total return after incentive fees (2) -16.64 % -16.02 % -16.02 % -15.50 % -14.87 % -14.87 % Incentive fee per share - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, December 31, 2020 $ 72.68 $ 88.95 $ 83.33 $ 55.18 $ 67.54 $ 63.52 $ 85.99 $ 55.29 $ 90.21 $ 58.37 Net operating results: Interest income 0.03 0.04 0.04 0.11 0.14 0.13 0.16 0.10 0.16 0.11 Expenses (2.49 ) (1.69 ) (1.58 ) (3.75 ) (2.20 ) (2.07 ) (1.29 ) (0.83 ) (1.35 ) (0.88 ) Net gain/(loss) on investments, net of non-controlling interests 7.46 8.60 8.16 (51.54 )* 8.04 7.65 13.63 9.18 14.30 9.76 Net income/(loss) 5.00 6.95 6.62 (55.18 )* 5.98 5.71 12.50 8.45 13.11 8.99 Net asset value, June 30, 2021 $ 77.68 $ 95.90 $ 89.95 $ - * $ 73.52 $ 69.23 $ 98.49 $ 63.74 $ 103.32 $ 67.36 Ratios to average net assets Net investment income/(loss) -6.71 % -3.58 % -3.58 % -13.18 % -5.86 % -5.86 % -2.41 % -2.41 % -2.41 % -2.41 % Expenses before incentive fees (3)(4) 6.80 % 3.66 % 3.66 % 13.58 % 6.26 % 6.26 % 2.74 % 2.74 % 2.74 % 2.74 % Expenses after incentive fees (3)(4) 6.80 % 3.66 % 3.66 % 13.58 % 6.26 % 6.26 % 2.74 % 2.74 % 2.74 % 2.74 % Total return before incentive fees (2) 6.88 % 7.81 % 7.94 % 4.58 %* 8.85 % 8.99 % 14.54 % 15.28 % 14.53 % 15.40 % Total return after incentive fees (2) 6.88 % 7.81 % 7.94 % 4.58 %* 8.85 % 8.99 % 14.54 % 15.28 % 14.53 % 15.40 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2020 $ 79.93 $ 96.81 $ 130.54 $ 113.20 $ 112.81 $ 58.55 $ 70.99 $ 94.20 Net operating results: Interest income - - - - - - - - Expenses (3.35 ) (2.56 ) (3.44 ) (2.98 ) (2.99 ) (1.82 ) (1.09 ) (1.45 ) Net gain/(loss) on investments, net of non-controlling interests 9.28 11.30 15.24 13.25 13.23 9.44 11.54 15.32 Net income/(loss) 5.93 8.74 11.80 10.27 10.24 7.62 10.45 13.87 Net asset value, June 30, 2021 $ 85.86 $ 105.55 $ 142.34 $ 123.47 $ 123.05 $ 66.17 $ 81.44 $ 108.07 Ratios to average net assets Net investment income/(loss) -8.05 % -5.05 % -5.05 % -5.05 % -5.05 % -5.88 % -2.87 % -2.87 % Expenses before incentive fees (3)(4) 7.18 % 4.17 % 4.17 % 4.17 % 4.17 % 5.88 % 2.87 % 2.87 % Expenses after incentive fees (3)(4) 8.06 % 5.05 % 5.05 % 5.05 % 5.05 % 5.88 % 2.87 % 2.87 % Total return before incentive fees (2) 6.96 % 8.56 % 8.58 % 8.61 % 8.62 % 13.01 % 14.72 % 14.72 % Total return after incentive fees (2) 7.42 % 9.03 % 9.04 % 9.07 % 9.08 % 13.01 % 14.72 % 14.72 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2020 $ 110.90 $ 167.56 $ 96.10 $ 116.50 $ 155.92 Net operating results: Interest income - - - - - Expenses (4.65 ) (4.44 ) (3.67 ) (2.55 ) (3.42 ) Net gain/(loss) on investments, net of non-controlling interests 11.03 16.73 16.83 20.50 27.43 Net income/(loss) 6.38 12.29 13.16 17.95 24.01 Net asset value, June 30, 2021 $ 117.28 $ 179.85 $ 109.26 $ 134.45 $ 179.93 Ratios to average net assets Net investment income/(loss) -8.02 % -5.02 % -6.99 % -3.99 % -3.99 % Expenses before incentive fees (3)(4) 8.02 % 5.02 % 6.99 % 3.99 % 3.99 % Expenses after incentive fees (3)(4) 8.02 % 5.02 % 6.99 % 3.99 % 3.99 % Total return before incentive fees (2) 5.75 % 7.33 % 13.69 % 15.41 % 15.40 % Total return after incentive fees (2) 5.75 % 7.33 % 13.69 % 15.41 % 15.40 % Frontier Diversified Fund Frontier Masters Fund Frontier Long/Short Commodity Fund Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 1a Class 2 Class 2a Class 3 Class 3a Per unit operating performance (1) Net asset value, December 31, 2019 $ 101.10 $ 121.58 $ 113.61 $ 72.28 $ 87.18 $ 81.78 $ 44.20 $ 81.60 $ 52.55 $ 85.64 $ 55.31 Net operating results: Interest income 0.01 0.01 0.01 0.05 0.06 0.06 0.04 0.07 0.04 0.07 0.05 Expenses (3.31 ) (1.98 ) (1.76 ) (8.37 ) (2.64 ) (2.47 ) (1.44 ) (1.09 ) (0.70 ) (1.14 ) (0.74 ) Net gain/(loss) on investments, net of non-controlling interests (23.71 ) (29.73 ) (27.76 ) (2.04 ) (9.48 ) (8.81 ) 1.77 2.68 1.60 2.78 1.76 Net income/(loss) (27.01 ) (31.70 ) (29.52 ) (10.36 ) (12.05 ) (11.22 ) 0.37 1.67 0.94 1.71 1.07 Net asset value, June 30, 2020 $ 74.09 $ 89.88 $ 84.09 $ 61.92 $ 75.13 $ 70.56 $ 44.58 $ 83.27 $ 53.49 $ 87.35 $ 56.38 Ratios to average net assets Net investment income/(loss) -7.10 % -3.56 % -3.56 % -23.98 % -6.12 % -6.12 % -6.23 % -2.43 % -2.43 % -2.43 % -2.43 % Expenses before incentive fees (3)(4) 7.12 % 3.58 % 3.58 % 24.13 % 6.27 % 6.27 % 6.39 % 2.59 % 2.59 % 2.59 % 2.59 % Expenses after incentive fees (3)(4) 7.12 % 3.58 % 3.58 % 24.13 % 6.27 % 6.27 % 6.39 % 2.59 % 2.59 % 2.59 % 2.59 % Total return before incentive fees (2) -26.71 % -26.07 % -25.98 % -14.34 % -13.83 % -13.72 % 0.83 % 2.04 % 1.79 % 2.00 % 1.94 % Total return after incentive fees (2) -26.71 % -26.07 % -25.98 % -14.34 % -13.83 % -13.72 % 0.83 % 2.04 % 1.79 % 2.00 % 1.94 % Incentive fee per share - - - - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Balanced Fund Frontier Select Fund Class 1 Class 1AP Class 2 Class 2a Class 3a Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2019 $ 117.23 $ 137.81 $ 185.82 $ 161.04 $ 160.50 $ 66.56 $ 78.51 $ 103.94 Net operating results: Interest income 0.03 0.04 0.05 0.05 0.05 0.00 0.00 0.00 Expenses (3.37 ) (2.25 ) (3.03 ) (2.64 ) (2.62 ) (1.80 ) (0.96 ) (1.28 ) Net gain/(loss) on investments, net of non-controlling interests (35.30 ) (41.84 ) (56.41 ) (48.84 ) (48.69 ) (3.71 ) (4.65 ) (5.92 ) Net income/(loss) (38.64 ) (44.05 ) (59.38 ) (51.43 ) (51.26 ) (5.52 ) (5.61 ) (7.19 ) Net asset value, June 30, 2020 $ 78.59 $ 93.76 $ 126.44 $ 109.61 $ 109.24 $ 61.04 $ 72.90 $ 96.75 Ratios to average net assets Net investment income/(loss) -6.82 % -3.83 % -3.83 % -3.83 % -3.83 % -5.46 % -2.46 % -2.46 % Expenses before incentive fees (3)(4) 6.89 % 3.90 % 3.90 % 3.90 % 3.90 % 5.46 % 2.46 % 2.46 % Expenses after incentive fees (3)(4) 6.89 % 3.90 % 3.90 % 3.90 % 3.90 % 5.46 % 2.46 % 2.46 % Total return before incentive fees (2) -32.96 % -31.96 % -31.96 % -31.94 % -31.94 % -8.29 % -7.15 % -6.92 % Total return after incentive fees (2) -32.96 % -31.96 % -31.96 % -31.94 % -31.94 % -8.29 % -7.15 % -6.92 % Incentive fee per share - - - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % Frontier Global Fund Frontier Heritage Fund Class 1 Class 1AP Class 2 Class 1 Class 1AP Class 2 Per unit operating performance (1) Net asset value, December 31, 2019 $ 131.52 $ 154.43 $ 192.82 $ 97.54 $ 114.15 $ 153.59 Net operating results: Interest income 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (5.46 ) (4.07 ) (5.10 ) (3.60 ) (2.41 ) (3.23 ) Net gain/(loss) on investments, net of non-controlling interests (4.38 ) (5.00 ) (6.63 ) 2.57 3.51 3.87 Net income/(loss) (9.84 ) (9.08 ) (11.73 ) (1.03 ) 1.10 0.65 Net asset value, June 30, 2020 $ 121.68 $ 145.35 $ 181.09 $ 96.51 $ 115.25 $ 154.24 Ratios to average net assets Net investment income/(loss) -8.08 % -5.08 % -5.08 % -6.90 % -3.90 % -3.90 % Expenses before incentive fees (3)(4) 8.08 % 5.08 % 5.08 % 6.90 % 3.90 % 3.90 % Expenses after incentive fees (3)(4) 8.08 % 5.08 % 5.08 % 6.90 % 3.90 % 3.90 % Total return before incentive fees (2) -7.48 % -5.88 % -6.08 % -1.05 % 0.96 % 0.42 % Total return after incentive fees (2) -7.48 % -5.88 % -6.08 % -1.05 % 0.96 % 0.42 % Incentive fee per share - - - - - - Incentive Fee to ANA 0.00 % 0.00 % 0.00 % 0.00 % 0.00 % 0.00 %
Frontier Funds [Member]
Financial Highlights (Tables) [Line Items]
Schedule of financial highlights of trust	2021 2020 Ratios to average net assets (1) Net investment income/(loss) (1) -5.99 % -4.34 % Expenses before incentive fees (3) (4) 6.03 % -4.36 % Expenses after incentive fees (3) (4) 6.03 % -4.36 % Total return before incentive fees (2) 4.14 % -7.79 % Total return after incentive fees (2) 4.14 % -7.79 % 2021 2020 Ratios to average net assets (1) Net investment income/(loss) (1) -6.19 % -5.71 % Expenses before incentive fees (3) (4) 6.04 % 5.76 % Expenses after incentive fees (3) (4) 6.24 % 5.76 % Total return before incentive fees (2) 8.91 % -23.21 % Total return after incentive fees (2) 8.70 % -23.21 % (1) Annualized with the exception of incentive fees. (2) Total returns are not annualized. (3) Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Consolidated Statements of Operations of the Trust. See footnote 5.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Derivative Instruments and Hedging Activities (Tables) [Line Items]
Schedule of averages futures contracts	Bought Sold Frontier Balanced Fund 179 185 Bought Sold Frontier Balanced Fund 507 354 Bought Sold Frontier Balanced Fund 484 486 Bought Sold Frontier Balanced Fund 568 490
Schedule of net trading gain loss	Type of contract Frontier Balanced Fund Agriculturals $ 46,003 Currencies 23,445 Energies 16,610 Interest rates 9,688 Metals (52 ) Stock indices 13,469 Realized trading income/(loss) (1) $ 109,163 Type of contract Frontier Balanced Fund Agriculturals $ (27,242 ) Currencies (3,074 ) Energies (9,668 ) Interest rates (113,962 ) Metals 10,260 Stock indices (77,990 ) Realized trading income/(loss) (1) $ (221,676 ) (1) Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options. Frontier Balanced Type of contract Fund Agriculturals $ 109,315 Currencies (4,367 ) Energies 51,430 Interest rates 100,159 Metals 23,283 Stock indices 200,902 Realized trading income/(loss) (1) $ 480,722 Frontier Balanced Type of contract Fund Agriculturals $ 25,052 Currencies (89,048 ) Energies 14,070 Interest rates 128,434 Metals 316,370 Stock indices 25,681 Realized trading income/(loss) (1) $ 420,559
Schedule of net trading gain loss	Type of contract Frontier Balanced Fund Agriculturals $ (44,481 ) Currencies (30,413 ) Energies (2,700 ) Interest rates (15,689 ) Metals (18,299 ) Stock indices (11,046 ) Change in unrealized trading income/(loss) (1) $ (122,628 ) Type of contract Frontier Balanced Fund Agriculturals $ 32,288 Currencies (49,704 ) Energies (1,630 ) Interest rates 44,437 Metals (86,875 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (51,316 ) Frontier Balanced Type of contract Fund Agriculturals $ (37,679 ) Currencies (13,362 ) Energies 13,900 Interest rates (95,245 ) Metals (34,021 ) Stock indices (3,556 ) Change in unrealized trading income/(loss) (1) $ (169,963 ) (1) Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit) Frontier Balanced Type of contract Fund Agriculturals $ 14,916 Currencies (20,473 ) Energies (4,275 ) Interest rates 36,412 Metals (113,782 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (77,034 )
Schedule of gross and net information about the trust's assets and liabilities	Net Amounts Gross Amounts of Gross Amounts Presented in the recognized offset in the Statements of Derivative Statements of Financial Frontier Balanced Fund Assets/Liabilities Financial Condition Condition Open Trade Equity/(Deficit) $ 401,858 $ (473,290 ) $ (71,432 ) Net Amounts Gross Amounts Presented in the Gross Amounts of offset in the Statements of recognized Statements of Financial Frontier Balanced Fund Derivative Assets Financial Condition Condition Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440
Frontier Funds [Member]
Derivative Instruments and Hedging Activities (Tables) [Line Items]
Schedule of net trading gain loss	Type of contract Agriculturals $ 46,003 Currencies 23,445 Energies 16,610 Interest rates 9,688 Metals (52 ) Stock indices 13,469 Realized trading income/(loss) (1) $ 109,163 Type of contract Agriculturals $ (27,242 ) Currencies (3,074 ) Energies (9,668 ) Interest rates (113,962 ) Metals 10,260 Stock indices (77,990 ) Realized trading income/(loss) (1) $ (221,676 ) Type of contract Agriculturals $ 109,315 Currencies (4,367 ) Energies 51,430 Interest rates 100,159 Metals 23,283 Stock indices 200,902 Realized trading income/(loss) (1) $ 480,722 Type of contract Agriculturals $ 25,052 Currencies (89,048 ) Energies 14,070 Interest rates 128,434 Metals 316,370 Stock indices 25,681 Realized trading income/(loss) (1) $ 420,559 (1) Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.
Schedule of net trading gain loss	Type of contract Agriculturals $ (44,481 ) Currencies (30,413 ) Energies (2,700 ) Interest rates (15,689 ) Metals (18,299 ) Stock indices (11,046 ) Change in unrealized trading income/(loss) (1) $ (122,628 ) Type of contract Agriculturals $ 32,288 Currencies (49,704 ) Energies (1,630 ) Interest rates 44,437 Metals (86,875 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (51,316 ) Type of contract Agriculturals $ (37,679 ) Currencies (13,362 ) Energies 13,900 Interest rates (95,245 ) Metals (34,021 ) Stock indices (3,556 ) Change in unrealized trading income/(loss) (1) $ (169,963 ) Type of contract Agriculturals $ 14,916 Currencies (20,473 ) Energies (4,275 ) Interest rates 36,412 Metals (113,782 ) Stock indices 10,168 Change in unrealized trading income/(loss) (1) $ (77,034 ) (1) Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit)
Schedule of gross and net information about the trust's assets and liabilities	Gross Gross Amounts Net Amounts recognized Statements of in the Derivative Financial Statements of Open Trade Equity/(Deficit) $ 401,858 $ (473,290 ) $ (71,432 ) Gross Net Amounts Gross Amounts Presented recognized Statements of Statements of Derivative Financial Financial Frontier Balanced Fund Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440

Schedules of Investments (Detai

Schedules of Investments (Details) - Schedule of investment companies - USD ($)		Jun. 30, 2021		Dec. 31, 2020
Private Investment Companies [Member] | Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 133,307
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.57%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 3,197,727
Investment Owned, % of Total Capital (Net Asset Value)	[1]	13.68%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 993,772
Investment Owned, % of Total Capital (Net Asset Value)	[1]	4.25%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 1,939,527
Investment Owned, % of Total Capital (Net Asset Value)	[1]	8.29%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 6,984,677
Investment Owned, % of Total Capital (Net Asset Value)	[1]	29.87%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 5,780,863
Investment Owned, % of Total Capital (Net Asset Value)	[1]	24.72%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 2,557,962
Investment Owned, % of Total Capital (Net Asset Value)	[1]	10.94%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 281,563
Investment Owned, % of Total Capital (Net Asset Value)	[1]	1.20%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 476,157
Investment Owned, % of Total Capital (Net Asset Value)	[1]	2.04%
US Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Underlying Face Amount, at Face Value	[1]	$ 1,191,500		$ 1,755,000
US Treasury Securities [Member] | Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 1,490,213
Investment Owned, % of Total Capital (Net Asset Value)	[1]	6.37%
US Treasury Securities [Member] | Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 1,490,213
Investment Owned, % of Total Capital (Net Asset Value)	[1]	6.37%
Total Private Investment Companies [Member] | Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 22,345,555
Investment Owned, % of Total Capital (Net Asset Value)	[1]	95.56%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 3,222,991		$ 3,644,603
Investment Owned, % of Total Capital (Net Asset Value)	[2]	94.54%		87.12%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 957,311		$ 1,066,074
Investment Owned, % of Total Capital (Net Asset Value)	[2]	28.08%		25.49%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 190,967		$ 414,692
Investment Owned, % of Total Capital (Net Asset Value)	[2]	5.60%		9.91%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 615,570		$ 672,766
Investment Owned, % of Total Capital (Net Asset Value)	[2]	18.06%		16.08%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 674,082		$ 732,066
Investment Owned, % of Total Capital (Net Asset Value)	[2]	19.77%		17.50%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 472,188		$ 435,119
Investment Owned, % of Total Capital (Net Asset Value)	[2]	13.85%		10.40%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 312,873		$ 323,886
Investment Owned, % of Total Capital (Net Asset Value)	[2]	9.18%		7.74%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
Frontier Diversified Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Diversified Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 16,682		$ 16,669
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.49%		0.40%
Frontier Diversified Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 16,682		$ 16,669
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.49%		0.40%
Frontier Diversified Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1],[2]	$ 186,482
Investment Owned, % of Total Capital (Net Asset Value)	[1],[2]	5.47%
Frontier Diversified Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 186,482	[2]	$ 427,393
Investment Owned, % of Total Capital (Net Asset Value)	[1]	5.47%	[2]	10.22%
Investment Owned, Underlying Face Amount, at Face Value	[1]	$ 1,191,500
Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1],[2]	149,102
Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	149,102	[2]	$ 328,604
Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1],[2]	187,918
Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	187,918	[2]	427,509
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 767,148		$ 1,014,591
Investment Owned, % of Total Capital (Net Asset Value)	[2]	94.97%		102.12%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 324,005		$ 486,659
Investment Owned, % of Total Capital (Net Asset Value)	[2]	40.11%		48.98%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 237,946		$ 258,609
Investment Owned, % of Total Capital (Net Asset Value)	[2]	29.46%		26.03%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 205,197		$ 269,323
Investment Owned, % of Total Capital (Net Asset Value)	[2]	25.40%		27.11%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
Frontier Masters Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Masters Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 5,846		$ 907
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.72%		0.09%
Frontier Masters Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 5,846		$ 907
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.72%		0.09%
Frontier Masters Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 65,347
Investment Owned, % of Total Capital (Net Asset Value)	[1]	8.09%
Frontier Masters Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 65,347		$ 23,245
Investment Owned, % of Total Capital (Net Asset Value)	[1]	8.09%		2.34%
Frontier Masters Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 52,248
Frontier Masters Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	52,248		$ 17,872
Frontier Masters Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	65,850
Frontier Masters Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	65,850		23,251
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 1,280,647		$ 738,053
Investment Owned, % of Total Capital (Net Asset Value)	[2]	90.66%		56.19%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 522,927		$ 272,294
Investment Owned, % of Total Capital (Net Asset Value)	[2]	37.02%		20.73%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.00%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 281,563
Investment Owned, % of Total Capital (Net Asset Value)	[2]	19.93%
Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 476,157		$ 465,759
Investment Owned, % of Total Capital (Net Asset Value)	[2]	33.71%		35.46%
Frontier Long/Short Commodity Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 10,331		$ 17,736
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.73%		1.35%
Frontier Long/Short Commodity Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 10,331		$ 17,736
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.73%		1.35%
Frontier Long/Short Commodity Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 115,492
Investment Owned, % of Total Capital (Net Asset Value)	[1]	8.18%
Frontier Long/Short Commodity Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 115,492		$ 454,738
Investment Owned, % of Total Capital (Net Asset Value)	[1]	8.18%		34.63%
Frontier Long/Short Commodity Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 92,341
Frontier Long/Short Commodity Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	92,341		$ 349,629
Frontier Long/Short Commodity Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	116,381
Frontier Long/Short Commodity Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	116,381		454,862
Frontier Global Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 2,846,614		$ 3,068,656
Investment Owned, % of Total Capital (Net Asset Value)	[2]	102.36%		104.71%
Frontier Global Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 2,846,614		$ 3,068,656
Investment Owned, % of Total Capital (Net Asset Value)	[2]	102.36%		104.71%
Frontier Global Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
Frontier Global Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 8,406		$ 1,083
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.30%		0.04%
Frontier Global Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 8,406		$ 1,083
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.30%		0.04%
Frontier Global Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 93,971
Investment Owned, % of Total Capital (Net Asset Value)	[1]	3.38%
Frontier Global Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 93,971		$ 27,742
Investment Owned, % of Total Capital (Net Asset Value)	[1]	3.38%		0.95%
Frontier Global Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 75,135
Frontier Global Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	75,135		$ 21,330
Frontier Global Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	94,695
Frontier Global Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	94,695		27,750
Frontier Heritage Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 2,511,300		$ 2,367,462
Investment Owned, % of Total Capital (Net Asset Value)	[2]	98.65%		99.25%
Frontier Heritage Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 1,559,439		$ 1,539,331
Investment Owned, % of Total Capital (Net Asset Value)	[2]	61.26%		64.53%
Frontier Heritage Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 951,861		$ 828,131
Investment Owned, % of Total Capital (Net Asset Value)	[2]	37.39%		34.72%
Frontier Heritage Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 10,083		$ 2,880
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.40%		0.12%
Frontier Heritage Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[2]	$ 10,083		$ 2,880
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.40%		0.12%
Frontier Heritage Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 112,721
Investment Owned, % of Total Capital (Net Asset Value)	[1]	4.43%
Frontier Heritage Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 112,721		$ 73,847
Investment Owned, % of Total Capital (Net Asset Value)	[1]	4.43%		3.10%
Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 90,126
Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	90,126		$ 56,778
Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	113,589
Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | Cost [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of investment companies [Line Items]
Investment Owned, Fair Value	[1]	$ 113,589		$ 73,867
[1]	See Note 2 to the Financial Statements.
[2]	See Note 5 to the Financial Statements.

Schedules of Investments (Det_2

Schedules of Investments (Details) - Schedule of investment companies (Parentheticals) - US Treasury Note [Member] - USD ($)	Jun. 30, 2021	Dec. 31, 2020
US Treasury Securities [Member] | Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies (Parentheticals) [Line Items]
Investment Owned, at Cost	$ 1,501,686
Frontier Diversified Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies (Parentheticals) [Line Items]
Investment Owned, at Cost	1,501,686
Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies (Parentheticals) [Line Items]
Investment Owned, at Cost		$ 2,283,228
Frontier Global Fund [Member] | US Treasury Securities [Member] | The Series of Frontier Funds [Member]
Schedules of Investments (Details) - Schedule of investment companies (Parentheticals) [Line Items]
Investment Owned, at Cost	$ 1,501,686	$ 2,283,228

Schedules of Investments (Det_3

Schedules of Investments (Details) - Schedule of futures contracts and investment companies - USD ($)		Jun. 30, 2021		Dec. 31, 2020
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 449,023
Investment Owned, % of Total Capital (Net Asset Value)				1.74%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (348,583)
Investment Owned, % of Total Capital (Net Asset Value)				(1.36%)
Frontier Funds [Member] | Open Trade Equity/(Deficit) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 100,440
Investment Owned, % of Total Capital (Net Asset Value)				0.38%
Frontier Funds [Member] | Private Investment Companies [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 23,089,312
Investment Owned, % of Total Capital (Net Asset Value)	[1]			90.31%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (201,065)
Investment Owned, % of Total Capital (Net Asset Value)		(0.87%)
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various agriculture futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (811)		$ 72,005
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.28%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Agriculture Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (2,477)		$ 9,803
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		0.04%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (399)		$ 87,496
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.34%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (2,644)		$ 22,858
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		0.09%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Currency Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (16,585)		$ 10,573
Investment Owned, % of Total Capital (Net Asset Value)		(0.07%)		0.04%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various currency futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 2,707
Investment Owned, % of Total Capital (Net Asset Value)		0.01%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Currency Futures Contracts (Latin America) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 2,605		$ 5,833
Investment Owned, % of Total Capital (Net Asset Value)		0.01%		0.02%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various currency futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,200)		$ (100)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		0.00%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various energy futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 14,670
Investment Owned, % of Total Capital (Net Asset Value)		0.06%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (186,275)		$ 148,949
Investment Owned, % of Total Capital (Net Asset Value)		(0.80%)		0.58%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (90)		$ 2,882
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.01%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various interest rates futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 3,438		$ 2,438
Investment Owned, % of Total Capital (Net Asset Value)		0.01%		0.01%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various precious metal futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (12,366)		$ 28,625
Investment Owned, % of Total Capital (Net Asset Value)		(0.05%)		0.11%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various stock index futures contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,804)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various stock index futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 166		$ 5,312
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.02%
LONG FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various soft futures contracts (U.S.) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 52,349
Investment Owned, % of Total Capital (Net Asset Value)				0.20%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 129,633
Investment Owned, % of Total Capital (Net Asset Value)		0.56%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various agriculture futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 6,829
Investment Owned, % of Total Capital (Net Asset Value)		0.03%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Agriculture Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,009)
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 4,675
Investment Owned, % of Total Capital (Net Asset Value)		0.02%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Currency Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 9,569
Investment Owned, % of Total Capital (Net Asset Value)		0.04%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various currency futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,932)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Currency Futures Contracts (Latin America) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 895
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various energy futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (770)
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 118,204		$ (127,832)
Investment Owned, % of Total Capital (Net Asset Value)		0.51%		(0.50%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various interest rates futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (4,906)
Investment Owned, % of Total Capital (Net Asset Value)		(0.02%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various precious metal futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,339)		$ (25,560)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		(0.10%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various stock index futures contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 1,455
Investment Owned, % of Total Capital (Net Asset Value)		0.01%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various stock index futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (3,340)
Investment Owned, % of Total Capital (Net Asset Value)				(0.01%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various soft futures contracts (U.S.) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (42,669)
Investment Owned, % of Total Capital (Net Asset Value)				(0.17%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various agriculture futures contracts (Far East) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (30,963)
Investment Owned, % of Total Capital (Net Asset Value)				(0.12%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various agriculture futures contracts (Europe) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (10,797)
Investment Owned, % of Total Capital (Net Asset Value)				(0.04%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various Agriculture Futures Contracts (U.S.) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (92,738)
Investment Owned, % of Total Capital (Net Asset Value)				(0.36%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various base metals futures contracts (U.S.) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (10,289)
Investment Owned, % of Total Capital (Net Asset Value)				(0.04%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various currency futures contracts (U.S.) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 2,300
Investment Owned, % of Total Capital (Net Asset Value)				0.01%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various currency futures contracts (Europe) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (10,381)
Investment Owned, % of Total Capital (Net Asset Value)				(0.04%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various currency futures contracts (Latin America) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 2,512
Investment Owned, % of Total Capital (Net Asset Value)				0.01%
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various interest rates futures contracts (Far East) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (2,482)
Investment Owned, % of Total Capital (Net Asset Value)				(0.01%)
SHORT FUTURES CONTRACTS [Member] | Frontier Funds [Member] | Various interest rates futures contracts (U.S.) One [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 3,656
Investment Owned, % of Total Capital (Net Asset Value)				0.01%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 3,377,314
Investment Owned, % of Total Capital (Net Asset Value)	[1]			13.21%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 1,996,633
Investment Owned, % of Total Capital (Net Asset Value)	[1]			7.81%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 1,654,786
Investment Owned, % of Total Capital (Net Asset Value)	[1]			6.47%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 7,427,324
Investment Owned, % of Total Capital (Net Asset Value)	[1]			29.05%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 5,363,456
Investment Owned, % of Total Capital (Net Asset Value)	[1]			20.98%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 2,715,008
Investment Owned, % of Total Capital (Net Asset Value)	[1]			10.62%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - Quest Fit Feeder Fund (535) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 89,029
Investment Owned, % of Total Capital (Net Asset Value)	[1]			0.35%
Private Investment Companies [Member] | Frontier Funds [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[1]			$ 465,759
Investment Owned, % of Total Capital (Net Asset Value)	[1]			1.82%
U.S. TREASURY SECURITIES [Member] | US Treasury Note [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 1,191,500	[2]	$ 1,755,000
U.S. TREASURY SECURITIES [Member] | Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 2,282,606
Investment Owned, % of Total Capital (Net Asset Value)				8.93%
U.S. TREASURY SECURITIES [Member] | Frontier Funds [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (2,038)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)
U.S. TREASURY SECURITIES [Member] | Frontier Funds [Member] | US Treasury Note [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 2,282,606
Investment Owned, % of Total Capital (Net Asset Value)				8.93%
Open Trade Equity (Deficit) [Member] | Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (71,432)
Investment Owned, % of Total Capital (Net Asset Value)		(0.31%)
Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member] | Open Trade Equity (Deficit) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (71,432)		$ 100,440
Investment Owned, % of Total Capital (Net Asset Value)		(0.66%)		0.81%
Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	$ 703,294
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (201,065)		$ 449,023
Investment Owned, % of Total Capital (Net Asset Value)		(1.84%)		3.70%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various agriculture futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (811)		$ 72,005
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		0.59%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (2,477)		$ 9,803
Investment Owned, % of Total Capital (Net Asset Value)		(0.02%)		0.08%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (399)		$ 87,496
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.72%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (2,644)		$ 22,858
Investment Owned, % of Total Capital (Net Asset Value)		(0.02%)		0.19%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (16,585)		$ 10,573
Investment Owned, % of Total Capital (Net Asset Value)		(0.15%)		0.09%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 2,707
Investment Owned, % of Total Capital (Net Asset Value)		0.03%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Latin America) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 2,605		$ 5,833
Investment Owned, % of Total Capital (Net Asset Value)		0.02%		0.05%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,200)		$ (100)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		0.00%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various energy futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 14,670
Investment Owned, % of Total Capital (Net Asset Value)		0.14%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (186,275)		$ 148,949
Investment Owned, % of Total Capital (Net Asset Value)		(1.72%)		1.23%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (90)		$ 2,882
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.02%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various interest rates futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 3,438		$ 2,438
Investment Owned, % of Total Capital (Net Asset Value)		0.03%		0.02%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various precious metal futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (12,366)		$ 28,625
Investment Owned, % of Total Capital (Net Asset Value)		(0.11%)		0.24%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,804)
Investment Owned, % of Total Capital (Net Asset Value)		(0.02%)
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 166		$ 5,312
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.04%
Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various soft futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 52,349
Investment Owned, % of Total Capital (Net Asset Value)				0.43%
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 129,633		$ (348,583)
Investment Owned, % of Total Capital (Net Asset Value)		1.18%		(2.89%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various agriculture futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 6,829		$ (30,963)
Investment Owned, % of Total Capital (Net Asset Value)		0.06%		(0.26%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,009)		$ (10,797)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		(0.09%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 4,675		$ (92,738)
Investment Owned, % of Total Capital (Net Asset Value)		0.04%		(0.77%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (2,038)		$ (10,289)
Investment Owned, % of Total Capital (Net Asset Value)		(0.02%)		(0.08%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 9,569		$ (10,381)
Investment Owned, % of Total Capital (Net Asset Value)		0.09%		(0.09%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,932)
Investment Owned, % of Total Capital (Net Asset Value)		(0.02%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Latin America) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 895		$ 2,512
Investment Owned, % of Total Capital (Net Asset Value)		0.01%		0.02%
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ 2,300
Investment Owned, % of Total Capital (Net Asset Value)				0.02%
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various energy futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (770)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 118,204		$ (127,832)
Investment Owned, % of Total Capital (Net Asset Value)		1.09%		(1.06%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (2,482)
Investment Owned, % of Total Capital (Net Asset Value)				(0.02%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various interest rates futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (4,906)		$ 3,656
Investment Owned, % of Total Capital (Net Asset Value)		(0.05%)		0.03%
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various precious metal futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ (1,339)		$ (25,560)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		(0.21%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value		$ 1,455
Investment Owned, % of Total Capital (Net Asset Value)		0.01%
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (3,340)
Investment Owned, % of Total Capital (Net Asset Value)				(0.03%)
Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various soft futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value				$ (42,669)
Investment Owned, % of Total Capital (Net Asset Value)				(0.35%)
Frontier Balanced Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 9,976,440		$ 10,528,252
Investment Owned, % of Total Capital (Net Asset Value)	[3]	92.34%		86.93%
Frontier Balanced Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 2,240,416		$ 2,311,240
Investment Owned, % of Total Capital (Net Asset Value)	[3]	20.74%		19.08%
Frontier Balanced Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 802,805		$ 1,581,941
Investment Owned, % of Total Capital (Net Asset Value)	[3]	7.43%		13.06%
Frontier Balanced Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 1,323,957		$ 982,020
Investment Owned, % of Total Capital (Net Asset Value)	[3]	12.25%		8.11%
Frontier Balanced Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 1,580,537		$ 1,600,611
Investment Owned, % of Total Capital (Net Asset Value)	[3]	14.63%		13.22%
Frontier Balanced Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 2,644,643		$ 2,612,336
Investment Owned, % of Total Capital (Net Asset Value)	[3]	24.48%		21.57%
Frontier Balanced Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 1,384,082		$ 1,440,104
Investment Owned, % of Total Capital (Net Asset Value)	[3]	12.81%		11.89%
Frontier Balanced Fund [Member] | Investment in Unconsolidated Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 78,686
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.73%
Frontier Balanced Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 78,686		$ 49,755
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.73%		0.41%
Frontier Balanced Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]			$ 49,755
Investment Owned, % of Total Capital (Net Asset Value)	[3]			0.41%
Frontier Balanced Fund [Member] | U.S. TREASURY SECURITIES [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	$ 879,612
Investment Owned, % of Total Capital (Net Asset Value)	[2]	8.14%
Frontier Balanced Fund [Member] | U.S. TREASURY SECURITIES [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	$ 879,612		$ 1,275,641
Investment Owned, % of Total Capital (Net Asset Value)	[2]	8.14%		10.53%
Frontier Balanced Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, at Cost	[2]	$ 886,384
Frontier Balanced Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	703,294		$ 980,787
Investment Owned, at Cost	[2]	886,384		1,275,989
Frontier Select Fund [Member] | The Series of Frontier Funds [Member] | Open Trade Equity (Deficit) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | The Series of Frontier Funds [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	$ 29,254
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various agriculture futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Latin America) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various energy futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various interest rates futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various precious metal futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various soft futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)				0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various agriculture futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Currency Futures Contracts (Latin America) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various currency futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)				0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various energy futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)				0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various interest rates futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various precious metal futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Europe) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various stock index futures contracts (Far East) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)				0.00%
Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | The Series of Frontier Funds [Member] | Various soft futures contracts (U.S.) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)				0.00%
Frontier Select Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 1,607,108		$ 1,638,665
Investment Owned, % of Total Capital (Net Asset Value)	[3]	99.10%		99.13%
Frontier Select Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.00%		0.00%
Frontier Select Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.00%		0.00%
Frontier Select Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.00%		0.00%
Frontier Select Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.00%		0.00%
Frontier Select Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 951,298		$ 956,968
Investment Owned, % of Total Capital (Net Asset Value)	[3]	58.66%		57.89%
Frontier Select Fund [Member] | Private Investment Companies [Member] | The Series of Frontier Funds [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 655,810		$ 681,697
Investment Owned, % of Total Capital (Net Asset Value)		40.44%		41.24%	[3]
Frontier Select Fund [Member] | Investment in Unconsolidated Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 3,273
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.20%
Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]	$ 3,273
Investment Owned, % of Total Capital (Net Asset Value)	[3]	0.20%		0.00%	[2]
Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | The Series of Frontier Funds [Member] | Frontier Trading Company XXXVIII, LLC [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[3]
Investment Owned, % of Total Capital (Net Asset Value)	[3]			0.00%
Frontier Select Fund [Member] | U.S. TREASURY SECURITIES [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	$ 36,588
Investment Owned, % of Total Capital (Net Asset Value)	[2]	2.26%
Frontier Select Fund [Member] | U.S. TREASURY SECURITIES [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	$ 36,588
Investment Owned, % of Total Capital (Net Asset Value)	[2]	2.26%		0.00%
Frontier Select Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member]
LONG FUTURES CONTRACTS*
Investment Owned, at Cost	[2]	$ 36,869
Frontier Select Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | The Series of Frontier Funds [Member] | US Treasury Note [Member]
LONG FUTURES CONTRACTS*
Investment Owned, Fair Value	[2]	29,254
Investment Owned, at Cost	[2]	$ 36,869
[1]	See Notes to Consolidated Financial Statements, Note 5.
[2]	See Note 2 to the Financial Statements.
[3]	See Note 5 to the Financial Statements.

Schedules of Investments (Det_4

Schedules of Investments (Details) - Schedule of futures contracts and investment companies (Parentheticals) - Frontier Balanced Fund [Member] - The Series of Frontier Funds [Member] - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Schedules of Investments (Details) - Schedule of futures contracts and investment companies (Parentheticals) [Line Items]
Investment Owned, at Cost		$ 2,283,228
US Treasury Securities [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of futures contracts and investment companies (Parentheticals) [Line Items]
Investment Owned, at Cost	$ 1,501,686
U.S. TREASURY SECURITIES [Member] | US Treasury Note [Member]
Schedules of Investments (Details) - Schedule of futures contracts and investment companies (Parentheticals) [Line Items]
Investment Owned, at Cost		$ 2,283,228

Organization and Purpose (Detai

Organization and Purpose (Details)	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Managing owner contributions to the series of the trust percentage	1.00%
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	10.00%
Percentage of average daily NAV charged as a service fees	3.00%
Aggregate initial and ongoing service fees	9.00%
Redemption fee percentage	2.00%
Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Managing owner contributions to the series of the trust percentage	1.00%
Service fee percentage	2.00%
Percentage of NAV charged as a service fees	3.00%
Aggregate initial and ongoing service fees	9.00%
Aggregate underwriting compensation percentage	10.00%
Minimum [Member] | The Series of Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Assets normally invested in one or more trading companies	30.00%
Minimum [Member] | Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Assets normally invested in one or more trading companies	30.00%
Maximum [Member] | The Series of Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Assets normally invested in one or more trading companies	70.00%
Maximum [Member] | Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Assets normally invested in one or more trading companies	70.00%
Class 1 or Class 1a [Member] | The Series of Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	2.00%
Percentage of average daily NAV charged as a service fees	3.00%
Percentage of NAV charged as a service fees	3.00%
Class 1 or Class 1a [Member] | Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Percentage of average daily NAV charged as a service fees	3.00%
Redemption fee percentage	2.00%
Class 2 or Class 2a [Member] | The Series of Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Service fee percentage	0.50%
Percentage of NAV charged as a service fees	0.25%
Class 2 and Class 2a [Member] | Frontier Funds [Member]
Organization and Purpose (Details) [Line Items]
Service fee percentage	0.50%
Service fee charged to limited owners	0.25%

Significant Accounting Polici_2

Significant Accounting Policies (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Managing owner percentage	2.00%
Restricted cash (in Dollars)	$ 152,599	$ 321,638
Gross income of the Trust constitutes qualifying income	90.00%
Incentive fees percentage	10.00%
Incentive fee, description	If the Managing Owner’s share of the incentive fee exceeds 10% of new net profits during the period for a particular series, then the Managing Owner is obligated to return any amount in excess to the Series. The returned amounts are recorded as Incentive Fee (Rebate) on the Statements of Operations.
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	2.00%
Percentage of average daily NAV charged as a service fees	3.00%
Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Gross income of the Trust constitutes qualifying income	90.00%
Service fee percentage	2.00%
Subscriptions in advance (in Dollars)	$ 656,619	638,962
Frontier Funds [Member] | Frontier Trading Company I LLC [Member]
Significant Accounting Policies (Details) [Line Items]
Restricted cash (in Dollars)	$ 152,599	$ 321,638
Class 1 or Class 1a [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Aggregate interest income percentage	100.00%
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Percentage of average daily NAV charged as a service fees	3.00%
Class 1 or Class 1a [Member] | Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	2.00%
Percentage of average daily NAV charged as a service fees	3.00%
Class 1 or Class 1a [Member] | Frontier Balanced Fund [Member] | Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Service fee percentage	3.00%
Amortized monthly annual rate	3.00%
Redemption fee percentage	3.00%
Class 2 or Class 2a [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Service fee percentage	0.50%
Frontier Diversified Fund [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Advance for service fee (in Dollars)	$ 22,650
Frontier Long/Short Commodity Fund [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Advance for service fee (in Dollars)	392
Frontier Masters Fund [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Advance for service fee (in Dollars)	31,725
Frontier Balanced Fund [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Advance for service fee (in Dollars)	358,273
Frontier Select Fund [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Advance for service fee (in Dollars)	$ 20,378
Frontier Global Fund [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Purchase and Sales of Private Investment Companies	$156,772
Frontier Heritage Fund [Member] | The Series of Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Advance for service fee (in Dollars)	$ 66,429
Class 1AP, Class 2a and Class 3a [Member] | Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Interest percentage	100.00%
Class 2 and Class 2a [Member] | Frontier Funds [Member]
Significant Accounting Policies (Details) [Line Items]
Service fee percentage	0.50%
Service fee charged to limited owners	0.25%

Fair Value Measurements (Detail

Fair Value Measurements (Details)	12 Months Ended
	Dec. 31, 2020USD ($)
Swaps [Member] | Frontier Funds [Member]
Fair Value Measurements (Details) [Line Items]
Total change in unrealized appreciation (depreciation)	$ (4,384,210)

Fair Value Measurements (Deta_2

Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value - The Series of Frontier Funds [Member] - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Frontier Diversified Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	$ 16,682	$ 16,669
U.S. Treasury Securities	186,482	427,393
Frontier Diversified Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	16,682	16,669
U.S. Treasury Securities	186,482	427,393
Frontier Diversified Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Diversified Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Masters Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	5,846	907
U.S. Treasury Securities	65,347	23,245
Frontier Masters Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	5,846	907
U.S. Treasury Securities	65,347	23,245
Frontier Masters Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Masters Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Long/Short Commodity Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	10,331	17,736
U.S. Treasury Securities	115,492	454,738
Frontier Long/Short Commodity Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	10,331	17,736
U.S. Treasury Securities	115,492	454,738
Frontier Long/Short Commodity Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Long/Short Commodity Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Balanced Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	78,686	49,755
Open Trade Equity (Deficit)	(71,432)	100,440
U.S. Treasury Securities	879,612	1,275,641
Frontier Balanced Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	78,686	49,755
Open Trade Equity (Deficit)	(71,432)	100,440
U.S. Treasury Securities	879,612	1,275,641
Frontier Balanced Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
Open Trade Equity (Deficit)
U.S. Treasury Securities
Frontier Balanced Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
Open Trade Equity (Deficit)
U.S. Treasury Securities
Frontier Select Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	3,273
U.S. Treasury Securities	36,588
Frontier Select Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	3,273
U.S. Treasury Securities	36,588
Frontier Select Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Select Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Global Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	8,406	1,083
U.S. Treasury Securities	93,971	27,742
Frontier Global Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	8,406	1,083
U.S. Treasury Securities	93,971	27,742
Frontier Global Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Global Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Heritage Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	10,083	2,880
U.S. Treasury Securities		73,847
Frontier Heritage Fund [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
U.S. Treasury Securities	112,721
Frontier Heritage Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies	10,083	2,880
U.S. Treasury Securities		73,847
Frontier Heritage Fund [Member] | Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
U.S. Treasury Securities	112,721
Frontier Heritage Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Heritage Fund [Member] | Level 2 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
U.S. Treasury Securities
Frontier Heritage Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Heritage Fund [Member] | Level 3 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value [Line Items]
U.S. Treasury Securities

Fair Value Measurements (Deta_3

Fair Value Measurements (Details) - Schedule of change in Level 3 assets measured at fair value on recurring basis - Level 3 Inputs [Member] - The Series of Frontier Funds [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
Frontier Balanced Fund [Member] | Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning, Balance of recurring Level 3 assets	$ 11,944,753
Total gains or losses (realized/unrealized):
Included in earnings-realized	(2,448,166)
Included in earnings-unrealized	(3,088,917)
Proceeds from collateral reduction	(6,176,555)
Sale of investments	(7,586,366)
Purchase of investments	7,355,251
Change in ownership allocation
Transfers in and/or out of Level 3
Ending, Balance of recurring Level 3 assets
Frontier Long/Short Commodity Fund [Member] | Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning, Balance of recurring Level 3 assets	362,521
Total gains or losses (realized/unrealized):
Included in earnings-realized	188,100
Included in earnings-unrealized	44,277
Proceeds from collateral reduction	(115,000)
Sale of investments	(594,898)
Purchase of investments	115,000
Change in ownership allocation
Transfers in and/or out of Level 3
Ending, Balance of recurring Level 3 assets
Frontier Diversified Fund [Member] | Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning, Balance of recurring Level 3 assets	6,384,583
Total gains or losses (realized/unrealized):
Included in earnings-realized	(446,306)
Included in earnings-unrealized	(1,537,399)
Proceeds from collateral reduction	(4,000,000)
Sale of investments	(4,870,025)
Purchase of investments	4,469,147
Change in ownership allocation
Transfers in and/or out of Level 3
Ending, Balance of recurring Level 3 assets
Frontier Heritage Fund [Member] | Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning, Balance of recurring Level 3 assets	2,888,009
Total gains or losses (realized/unrealized):
Included in earnings-realized	(97,745)
Included in earnings-unrealized	197,829
Proceeds from collateral reduction	(2,474,937)
Sale of investments	(1,491,965)
Purchase of investments	978,809
Change in ownership allocation
Transfers in and/or out of Level 3
Ending, Balance of recurring Level 3 assets
Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning, Balance of recurring Level 3 assets	479,024
Total gains or losses (realized/unrealized):
Change in fair value of investments in unconsolidated trading companies	95,915
Proceeds from sales of investments of unconsolidated trading companies	(574,939)
Purchases of investments of unconsolidated trading companies
Change in ownership allocation
Transfers in and/or out of Level 3
Ending, Balance of recurring Level 3 assets

Fair Value Measurements (Deta_4

Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) - The Series of the Frontier Funds [Member]	6 Months Ended
	Jun. 30, 2021USD ($)
Frontier Diversified Fund [Member] | Swap [Member]
Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) [Line Items]
Total change in unrealized appreciation (depreciation)	$ (1,537,399)
Frontier Long/Short Commodity Fund [Member] | Swap [Member]
Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) [Line Items]
Total change in unrealized appreciation (depreciation)	44,277
Frontier Balanced Fund [Member] | Swap [Member]
Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) [Line Items]
Total change in unrealized appreciation (depreciation)	(3,088,917)
Frontier Heritage Fund [Member] | Swap [Member]
Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) [Line Items]
Total change in unrealized appreciation (depreciation)	197,829
Frontier Select Fund [Member] | Investments in Unconsolidated Trading Companies [Member]
Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) [Line Items]
Total change in unrealized appreciation (depreciation)	$ (91,989)

Swap Contracts (Details)

Swap Contracts (Details)	Jun. 30, 2021USD ($)
The Series of Frontier Funds [Member]
Swap Contracts (Details) [Line Items]
Cash holding shall be in excess amount	$ 250,000
Percentage of index exposure total	40.00%
Frontier Funds [Member]
Swap Contracts (Details) [Line Items]
Cash holding shall be in excess amount	$ 250,000
Percentage of index exposure total	40.00%

Swap Contracts (Details) - Sche

Swap Contracts (Details) - Schedule of investments in following swap - DeutscheBank AG [Member] - The Series of the Frontier Funds [Member] - Swap [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
Frontier Balanced Fund [Member]
Swap Contracts (Details) - Schedule of investments in following swap [Line Items]
Realized Gain/(Loss)	$ (2,448,166)
Change in Unrealized Gain/(Loss)	(3,088,917)
Fair Value as of December 31, 2020	0
Advance on swap appreciation	0
Frontier Diversified Fund [Member]
Swap Contracts (Details) - Schedule of investments in following swap [Line Items]
Realized Gain/(Loss)	(446,306)
Change in Unrealized Gain/(Loss)	(1,537,399)
Fair Value as of December 31, 2020	0
Advance on swap appreciation	0
Frontier Long/Short Commodity Fund [Member]
Swap Contracts (Details) - Schedule of investments in following swap [Line Items]
Realized Gain/(Loss)	188,100
Change in Unrealized Gain/(Loss)	44,277
Fair Value as of December 31, 2020	0
Advance on swap appreciation	0
Frontier Heritage Fund [Member]
Swap Contracts (Details) - Schedule of investments in following swap [Line Items]
Realized Gain/(Loss)	(97,745)
Change in Unrealized Gain/(Loss)	197,829
Fair Value as of December 31, 2020	0
Advance on swap appreciation	$ 0

Investments in Unconsolidated_3

Investments in Unconsolidated Trading Companies and Private Investment Companies (Details)	Jun. 30, 2021
The Series of the Frontier Funds [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) [Line Items]
Trust’s total capital	5.00%
Frontier Funds [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) [Line Items]
Trust’s total capital	5.00%

Investments in Unconsolidated_4

Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies - The Series of the Frontier Funds [Member] - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Frontier Diversified Series [Member] | Frontier Trading Company XXXVIII [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies [Line Items]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.49%	0.40%
Fair Value (in Dollars)	$ 16,682	$ 16,669
Frontier Masters Fund [Member] | Frontier Trading Company XXXVIII [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies [Line Items]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.72%	0.09%
Fair Value (in Dollars)	$ 5,846	$ 907
Frontier Long/Short Commodity Fund [Member] | Frontier Trading Company XXXVIII [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies [Line Items]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.73%	1.35%
Fair Value (in Dollars)	$ 10,331	$ 17,736
Frontier Balanced Fund [Member] | Frontier Trading Company XXXVIII [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies [Line Items]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.73%	0.41%
Fair Value (in Dollars)	$ 78,686	$ 49,755
Frontier Select Fund [Member] | Frontier Trading Companies XXXVIII [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies [Line Items]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.20%	0.00%
Fair Value (in Dollars)	$ 3,273
Frontier Global Fund [Member] | Frontier Trading Company XXXVIII [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies [Line Items]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.30%	0.04%
Fair Value (in Dollars)	$ 8,406	$ 1,083
Frontier Heritage Fund [Member] | Frontier Trading Company XXXVIII [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of investments in unconsolidated trading companies [Line Items]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.40%	0.12%
Fair Value (in Dollars)	$ 10,083	$ 2,880

Investments in Unconsolidated_5

Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Frontier Balanced Fund [Member]
Frontier Balanced Fund
Trading Commissions	$ (30,470)	$ (53,033)	$ (58,469)	$ (53,033)
Realized Gain/(Loss)	515,536	(1,239,030)	747,773	(1,332,630)
Change in Unrealized Gain/(Loss)	73,094	250,098	292,046	133,104
Net Income (Loss)	558,160	(1,041,965)	981,350	(1,252,559)
Frontier Balanced Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	(8,036)	13,836	(22,317)	(9,465)
Net Income (Loss)	(8,036)	13,836	(22,317)	(9,465)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(973)	(5,100)	(2,581)	(5,100)
Realized Gain/(Loss)	51,102	(88,960)	156,170	12,484
Change in Unrealized Gain/(Loss)	52,345	(255,603)	59,479	4,697
Net Income (Loss)	102,474	(349,663)	213,068	12,081
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(2,152)		(2,152)
Realized Gain/(Loss)	(433)	(49,427)	(433)	(55,735)
Change in Unrealized Gain/(Loss)		67,132		25,524
Net Income (Loss)	(433)	15,553	(433)	(32,363)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(6,408)		(6,408)
Realized Gain/(Loss)	252	(407,643)	252	(718,397)
Change in Unrealized Gain/(Loss)		414,194		81,531
Net Income (Loss)	252	143	252	(643,274)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(6,399)	(15,974)	(13,166)	(15,974)
Realized Gain/(Loss)	197,477	(403,362)	294,440	(324,444)
Change in Unrealized Gain/(Loss)	51,803	546,868	(159,281)	189,882
Net Income (Loss)	242,881	127,532	121,993	(150,536)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(502)		(502)
Realized Gain/(Loss)	(1,910)	(239,751)	(1,910)	(232,245)
Change in Unrealized Gain/(Loss)		237,492		(21,665)
Net Income (Loss)	(1,910)	(2,761)	(1,910)	(254,412)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(2,902)	(8,555)	(5,401)	(8,555)
Realized Gain/(Loss)	(19,728)	(693,367)	(203,111)	(667,819)
Change in Unrealized Gain/(Loss)	(174,263)	349,783	(166,727)	50,898
Net Income (Loss)	(196,893)	(352,139)	(375,239)	(625,476)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(4,586)	(1,701)	(8,909)	(1,701)
Realized Gain/(Loss)	68,282	79,790	117,348	56,595
Change in Unrealized Gain/(Loss)	(31,967)	(195,781)	77,978	(28,862)
Net Income (Loss)	31,729	(117,692)	186,417	26,032
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(14,466)	(12,641)	(26,328)	(12,641)
Realized Gain/(Loss)	147,713	563,690	813,419	596,931
Change in Unrealized Gain/(Loss)	231,570	(927,823)	156,670	(159,436)
Net Income (Loss)	364,817	(376,774)	943,761	424,854
Frontier Balanced Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Frontier Balanced Fund
Trading Commissions	(1,144)		(2,084)
Realized Gain/(Loss)	72,781		(428,402)
Change in Unrealized Gain/(Loss)	(48,358)		346,244
Net Income (Loss)	23,279		(84,242)
Frontier Global Fund [Member]
Frontier Balanced Fund
Trading Commissions	(1,816)	(8,398)	(4,324)	(8,398)
Realized Gain/(Loss)	92,598	(308,501)	265,492	1,157
Change in Unrealized Gain/(Loss)	46,410	(323,678)	21,991	(79,633)
Net Income (Loss)	137,192	(640,577)	283,159	(86,874)
Frontier Global Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	(970)	4,623	15,163	(454)
Net Income (Loss)	(970)	4,623	15,163	(454)
Frontier Global Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(1,816)	(8,398)	(4,324)	(8,398)
Realized Gain/(Loss)	92,598	(308,501)	265,492	1,157
Change in Unrealized Gain/(Loss)	47,380	(328,301)	6,828	(79,179)
Net Income (Loss)	138,162	(645,200)	267,996	(86,420)
Frontier Select Fund [Member]
Frontier Balanced Fund
Trading Commissions	(5,472)	(9,517)	(9,361)	(9,517)
Realized Gain/(Loss)	81,788	(50,583)	65,198	(42,660)
Change in Unrealized Gain/(Loss)	43,734	(64,299)	197,208	(93,780)
Net Income (Loss)	120,052	(124,399)	253,045	(145,957)
Frontier Select Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	148	(143)	8,689	(6,672)
Net Income (Loss)	148	(143)	8,689	(6,672)
Frontier Select Fund [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)	387		387
Change in Unrealized Gain/(Loss)		(1,616)
Net Income (Loss)	387	(1,616)	387
Frontier Select Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(4,951)	(4,125)	(8,448)	(4,125)
Realized Gain/(Loss)	55,643	170,109	254,132	195,063
Change in Unrealized Gain/(Loss)	67,990	(288,624)	46,367	(1,616)
Net Income (Loss)	118,682	(122,640)	292,051	189,322
Frontier Select Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Frontier Balanced Fund
Trading Commissions	(521)		(913)
Realized Gain/(Loss)	24,894		(190,185)
Change in Unrealized Gain/(Loss)	(24,404)		142,152	(32,990)
Net Income (Loss)	(29)		(48,946)	(32,990)
Frontier Select Fund [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(5,392)		(5,392)
Realized Gain/(Loss)	864	(220,692)	864	(237,723)
Change in Unrealized Gain/(Loss)		226,084		(52,502)
Net Income (Loss)	864		864	(295,617)
Frontier Heritage Fund [Member]
Frontier Balanced Fund
Trading Commissions	(5,926)	(6,652)	(10,390)	(6,652)
Realized Gain/(Loss)	107,251	175,747	380,813	180,118
Change in Unrealized Gain/(Loss)	77,322	(512,711)	37,025	(102,700)
Net Income (Loss)	178,645	(343,616)	407,448	70,766
Frontier Heritage Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	391	2,779	13,018	(3,324)
Net Income (Loss)	391	2,779	13,018	(3,324)
Frontier Heritage Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(1,086)	(2,774)	(2,426)	(2,774)
Realized Gain/(Loss)	51,481	(35,321)	145,165	(1,359)
Change in Unrealized Gain/(Loss)	14,949	(179,266)	(14,508)	(36,695)
Net Income (Loss)	65,344	(217,361)	128,231	(40,828)
Frontier Heritage Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(4,840)	(3,878)	(7,964)	(3,878)
Realized Gain/(Loss)	55,770	211,068	235,648	181,477
Change in Unrealized Gain/(Loss)	61,982	(336,224)	38,515	(62,681)
Net Income (Loss)	112,910	(129,034)	266,199	114,918
Frontier Long/Short Commodity Fund [Member]
Frontier Balanced Fund
Trading Commissions	(5,537)	(3,236)	(9,435)	(3,236)
Realized Gain/(Loss)	153,588	(75,895)	282,852	(143,266)
Change in Unrealized Gain/(Loss)	(14,666)	35,188	(62,325)	(29,359)
Net Income (Loss)	133,385	(43,943)	211,092	(175,861)
Frontier Long/Short Commodity Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	785	1,630	12,908	(3,076)
Net Income (Loss)	785	1,630	12,908	(3,076)
Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(938)		(938)
Realized Gain/(Loss)	36	(41,364)	36	(103,100)
Change in Unrealized Gain/(Loss)		42,301		8,652
Net Income (Loss)	36	(1)	36	(95,386)
Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(194)	(672)	(423)	(672)
Realized Gain/(Loss)	102,498	(117,782)	126,047	(116,962)
Change in Unrealized Gain/(Loss)	(84,645)	122,271	(102,977)	(15,470)
Net Income (Loss)	17,659	3,817	22,647	(133,104)
Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(2,642)	(1,626)	(4,503)	(1,626)
Realized Gain/(Loss)	30,095	83,251	135,810	76,796
Change in Unrealized Gain/(Loss)	32,587	(131,014)	19,696	(19,465)
Net Income (Loss)	60,040	(49,389)	151,003	55,705
Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Frontier Balanced Fund
Trading Commissions	(2,701)		(4,509)
Realized Gain/(Loss)	20,959		20,959
Change in Unrealized Gain/(Loss)	36,607		8,048
Net Income (Loss)	54,865		24,498
Frontier Diversified Fund [Member]
Frontier Balanced Fund
Trading Commissions	(9,455)	(32,902)	(19,072)	(32,902)
Realized Gain/(Loss)	111,523	(481,959)	188,630	(631,755)
Change in Unrealized Gain/(Loss)	114,370	45,400	204,863	159,677
Net Income (Loss)	216,440	(469,461)	374,421	(504,980)
Frontier Diversified Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	(4,774)	4,032	5,472	3,023
Net Income (Loss)	(4,773)	4,032	5,472	3,023
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(664)	(3,370)	(1,417)	(3,370)
Realized Gain/(Loss)	23,903	(56,966)	76,428	31,349
Change in Unrealized Gain/(Loss)	32,380	(142,153)	31,221	10,159
Net Income (Loss)	55,619	(202,489)	106,232	38,138
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(1,348)		(1,348)
Realized Gain/(Loss)	(245)	(29,090)	(245)	(39,612)
Change in Unrealized Gain/(Loss)		38,354		17,676
Net Income (Loss)	(245)	7,916	(245)	(23,284)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(4,119)		(4,119)
Realized Gain/(Loss)	157	(194,763)	157	(463,144)
Change in Unrealized Gain/(Loss)		198,882		53,938
Net Income (Loss)	157		157	(413,325)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(2,921)	(11,130)	(6,152)	(11,130)
Realized Gain/(Loss)	17,238	(310,674)	64,786	(201,658)
Change in Unrealized Gain/(Loss)	107,434	377,368	12,197	79,262
Net Income (Loss)	121,751	55,564	70,831	(133,526)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(309)		(309)
Realized Gain/(Loss)	(1,166)	(148,003)	(1,166)	(144,282)
Change in Unrealized Gain/(Loss)		146,562		(12,689)
Net Income (Loss)	(1,166)	(1,750)	(1,166)	(157,280)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(714)	(3,841)	(1,354)	(3,841)
Realized Gain/(Loss)	(4,694)	(190,864)	(50,866)	(244,235)
Change in Unrealized Gain/(Loss)	(41,633)	79,076	(43,800)	46,440
Net Income (Loss)	(47,041)	(115,629)	(96,020)	(201,636)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(2,332)	(1,514)	(5,095)	(1,514)
Realized Gain/(Loss)	30,353	65,761	60,727	53,754
Change in Unrealized Gain/(Loss)	(4,431)	(153,963)	85,796	(19,897)
Net Income (Loss)	23,590	(89,716)	141,428	32,343
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(2,564)	(7,271)	(4,575)	(7,271)
Realized Gain/(Loss)	28,323	382,640	139,192	376,073
Change in Unrealized Gain/(Loss)	38,099	(502,758)	32,643	(18,235)
Net Income (Loss)	63,858	(127,389)	167,260	350,567
Frontier Diversified Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Frontier Balanced Fund
Trading Commissions	(260)		(479)
Realized Gain/(Loss)	17,654		(100,383)
Change in Unrealized Gain/(Loss)	(12,705)		81,334
Net Income (Loss)	4,690		(19,528)
Frontier Masters Fund [Member]
Frontier Balanced Fund
Trading Commissions	(1,863)	(7,448)	(3,434)	(7,448)
Realized Gain/(Loss)	39,204	54,797	39,644	(180,340)
Change in Unrealized Gain/(Loss)	11,178	(258,310)	72,093	(18,098)
Net Income (Loss)	48,518	(210,961)	108,303	(205,886)
Frontier Masters Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	(960)	4,207	11,801	(2,275)
Net Income (Loss)	(960)	4,207	11,801	(2,275)
Frontier Masters Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(419)	(2,049)	(772)	(2,049)
Realized Gain/(Loss)	12,291	(30,225)	35,923	(1,588)
Change in Unrealized Gain/(Loss)	5,931	(132,672)	39	(28,072)
Net Income (Loss)	17,803	(164,946)	35,190	(31,709)
Frontier Masters Fund [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Frontier Balanced Fund
Trading Commissions
Realized Gain/(Loss)	(58)		(58)
Change in Unrealized Gain/(Loss)		88		88
Net Income (Loss)	(58)	88	(58)	88
Frontier Masters Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(1,540)		(1,540)
Realized Gain/(Loss)	52	58,199	52	(190,409)
Change in Unrealized Gain/(Loss)		(56,659)		31,680
Net Income (Loss)	52		52	(160,269)
Frontier Masters Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Frontier Balanced Fund
Trading Commissions	(1,272)	(2,008)	(2,334)	(2,008)
Realized Gain/(Loss)	13,150	117,030	73,498	95,916
Change in Unrealized Gain/(Loss)	20,093	(165,332)	12,361	(9,097)
Net Income (Loss)	31,971	(50,310)	83,525	84,811
Frontier Masters Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Frontier Balanced Fund
Trading Commissions	(172)		(328)
Realized Gain/(Loss)	13,249		(70,291)
Change in Unrealized Gain/(Loss)	(13,886)		47,892
Net Income (Loss)	(810)		(22,727)
Frontier Masters Fund [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Frontier Balanced Fund
Trading Commissions		(1,851)		(1,851)
Realized Gain/(Loss)	520	(90,207)	520	(84,259)
Change in Unrealized Gain/(Loss)		92,058		(10,422)
Net Income (Loss)	$ 520		$ 520	$ (96,532)

Investments in Unconsolidated_6

Investments in Unconsolidated Trading Companies and Private Investment Companies (Details) - Schedule of private investment companies have certain redemption and liquidity restrictions - The Series of the Frontier Funds [Member]	6 Months Ended
	Jun. 30, 2021
Multi-Strategy [Member] | Frontier Diversified Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Diversified Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Masters Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Masters Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Balanced Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Balanced Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Select Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Select Fund [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Frontier Heritage Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Diversified Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Diversified Fund [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Diversified Fund [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Diversified Fund [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Masters Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Weekly
Liquidity Restrictions	None
Trend Following [Member] | Frontier Balanced Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Balanced Fund [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Balanced Fund [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Balanced Fund [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Global Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Frontier Heritage Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Multi-Strategy
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None

Transactions with Affiliates (D

Transactions with Affiliates (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
The Series of the Frontier Funds [Member]
Transactions with Affiliates (Details) [Line Items]
Description of range of incentive fee percentage					(i) swaps owned by Frontier Diversified Fund was 1.00% per annum, (ii) swaps owned by Frontier Balanced Fund was 1.00% per annum, (iii) swaps owned by Frontier Long/Short Commodity Fund was 1.50% per annum, (iv) swaps owned by Frontier Select Fund was 1.00% per annum, and (v) swaps owned by Frontier Heritage Fund was 1.00% per annum, and the Managing Owner has waived the entire management fee due to it from those Series in respect of such Series’ investment in swaps. In each case, the embedded management fee was accrued on the relevant notional amount of the swap.
Description of incentive fee percentage			The incentive fee is 25% for the Frontier Balanced Fund and the Frontier Diversified Fund and 20% for the Frontier Global Fund, Frontier Heritage Fund, Frontier Select Fund, Frontier Long/Short Commodity Fund and Frontier Masters Fund.
Description of service fees			Investors who have purchased Class 1 or Class 1a Units of Frontier Diversified Fund, Frontier Masters Fund, and Frontier Long/Short Commodity Fund are charged a service fee of up to two percent (2.0%) annually of the NAV (of the purchase price, in case of the initial service fee) of each Unit purchased, for the benefit of selling agents selling such Class 1 or Class 1a Units. The initial service fee, which is amortized monthly at an annual rate of up to two percent (2.0%) of the average daily NAV of Class 1 or Class 1a of such Series, is prepaid to the Managing Owner by each Series, and paid to the selling agents by the Managing Owner in the month following sale; provided, however, that investors who redeem all or a portion of their Class 1 and Class 1a Units of any Series during the first twelve (12) months following the effective date of their purchase are subject to a redemption fee of up to two percent (2.0%) of the purchase price at which such investor redeemed to reimburse the Managing Owner for the then-unamortized balance of the prepaid initial service fee. Investors who have purchased Class 1 or Class 1a Units of Frontier Balanced Fund, Frontier Heritage Fund, Frontier Select Fund, and Frontier Global Fund are charged a service fee of up to three percent (3.0%) annually of the NAV (of the purchase price, in case of the initial service fee) of each Unit purchased, for the benefit of selling agents selling such Class 1 or Class 1a Units. The initial service fee, which is amortized monthly at an annual rate of up to three percent (3.0%) of the average daily NAV of Class 1 or Class 1a of such Series, is prepaid to the Managing Owner by each Series, and paid to the selling agents by the Managing Owner in the month following sale; provided, however, that investors who redeem all or a portion of their Class 1 and Class 1a Units of any Series during the first twelve (12) months following the effective date of their purchase are subject to a redemption fee of up to three percent (3.0%) of the purchase price at which such investor redeemed to reimburse the Managing Owner for the then-unamortized balance of the prepaid initial service fee. With respect to Class 2 and Class 2a Units of any Series, the Managing Owner pays an ongoing service fee to selling agents of up to one half percent (0.5%) annually of the NAV of each Class 2 or Class 2a Unit (of which 0.25% will be charged to Limited Owners holding Class 2Units of the Frontier Diversified Fund and Frontier Masters Fund or Class 2a Units of the Frontier Long/Short Commodity Fund sold) until such Class 2 or Class 2a Units which are subject to the fee limitation are reclassified as Class 3 or Class 3a Units of the applicable Series for administrative purposes. Currently the service fee is not charged to Class 1AP investors. The Managing Owner may also pay selling agents certain additional fees and expenses for administrative and other services rendered and expenses incurred by such selling agents.
Description of interest income			Aggregate interest income from all sources, including U.S. Treasury Securities assets net of premiums and cash held at clearing brokers, of up to the first 2% (annualized) of average net assets less any fair market value related to swaps is paid to the Managing Owner by the Frontier Balanced Fund (Class 1 and Class 2), Frontier Long/Short Commodity Fund (Class 2 and Class 3), Frontier Global Fund, Frontier Select Fund, and Frontier Heritage Fund. For the Frontier Diversified Fund, Frontier Long/Short Commodity Fund (Class 1a, Class 2a and Class 3a), Frontier Masters Fund, and Frontier Balanced Fund (Class 1AP, Class 2a and Class 3a), 100% of the interest is retained by the respective Series.
The Series of the Frontier Funds [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of minimum purchase commitment			1.00%
Percentage of contributes funds to trust			1.00%
Percentage of interest			1.00%
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Subscriptions in advance for service fee (in Dollars)	$ 358,273		$ 358,273
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Subscriptions in advance for service fee (in Dollars)	392		392
The Series of the Frontier Funds [Member] | Frontier Global Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Subscriptions in advance for service fee (in Dollars)	$ 156,772		$ 156,772
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	0.75%		0.75%
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Subscriptions in advance for service fee (in Dollars)	$ 66,429		$ 66,429
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.50%		2.50%
Percentage of FCM fee	2.25%		2.25%
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Subscriptions in advance for service fee (in Dollars)	$ 31,725		$ 31,725
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of FCM fee	2.25%		2.25%
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Subscriptions in advance for service fee (in Dollars)	$ 22,650		$ 22,650
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Subscriptions in advance for service fee (in Dollars)	$ 20,378		$ 20,378
The Series of the Frontier Funds [Member] | Class 1AP [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of interest in specific series of trust			1.00%
Percentage of management fee	0.50%		0.50%
The Series of the Frontier Funds [Member] | Class 2a [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of interest in specific series of trust			1.00%
Percentage of management fee	0.50%		0.50%
The Series of the Frontier Funds [Member] | Class 2a [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.00%		2.00%
The Series of the Frontier Funds [Member] | Class 2a [Member] | Frontier Global Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.00%		2.00%
The Series of the Frontier Funds [Member] | Class 1 [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	0.50%		0.50%
The Series of the Frontier Funds [Member] | Class 2 [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	0.50%		0.50%
The Series of the Frontier Funds [Member] | Class 2 [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	3.50%		3.50%
The Series of the Frontier Funds [Member] | Class 3a [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	0.50%		0.50%
The Series of the Frontier Funds [Member] | Class 3a [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.00%		2.00%
The Series of the Frontier Funds [Member] | Class 3a [Member] | Frontier Global Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.00%		2.00%
The Series of the Frontier Funds [Member] | Class 1a [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.00%		2.00%
The Series of the Frontier Funds [Member] | Class 1a [Member] | Frontier Global Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.00%		2.00%
The Series of the Frontier Funds [Member] | Class 3 [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	3.50%		3.50%
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Description of range of incentive fee percentage					(i) swaps owned by Frontier Diversified Fund was 20-25% per annum, (ii) swaps owned by Frontier Balanced Fund was 20-25% per annum, (iii) swaps owned by Frontier Long/Short Commodity Fund was 25% per annum, and (iv) swaps owned by Frontier Heritage Fund was 15% per annum, and the Managing Owner has waived the entire incentive fee due to it from those Series in respect of such Series’ investment in swaps. In each case, the embedded incentive fee was accrued based on the net new trading profits of the swap.
Parent Company [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of minimum purchase commitment			1.00%
Percentage of contributes funds to trust			1.00%
Subscriptions in advance for service fee (in Dollars)	$ 656,619		$ 656,619		$ 638,962
Trust had payable for management fees (in Dollars)	1,511		1,511		8,854
Trust had payable for trading fees (in Dollars)	80,804		$ 80,804		$ 81,698
Description of interest income			Aggregate interest income from all sources, including U.S. Treasury Securities assets net of premiums and cash held at clearing brokers, of up to the first 2% (annualized) is paid to the Managing Owner by the Frontier Balanced Fund (Class 1 and Class 2 only), Frontier Long/Short Commodity Fund (Class 2 and Class 3), Frontier Global Fund, Frontier Select Fund, and Frontier Heritage Fund. For the Frontier Diversified Fund, Frontier Long/Short Commodity Fund (for the three months ended June 30, 2021, and June 30, 2020 amounts received or receivable from the Managing Owner for the difference in monthly service fees from the prepaid initial service fees Class 1a, Class 2a and Class 3a), Frontier Masters Fund, and Frontier Balanced Fund (Class 1AP, Class 2a and Class 3a), 100% of the interest is retained by the respective Series.
Trust paid (in Dollars)	6,809	$ 5,857
Parent Company [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Description of range of incentive fee percentage					(i) swaps owned by Frontier Diversified Fund was 20-25% per annum, (ii) swaps owned by Frontier Balanced Fund was 20-25% per annum, (iii) swaps owned by Frontier Long/Short Commodity Fund was 25% per annum, and (iv) swaps owned by Frontier Heritage Fund was 15% per annum, and the Managing Owner has waived the entire incentive fee due to it from those Series in respect of such Series’ investment in swaps. In each case, the embedded incentive fee was accrued based on the net new trading profits of the swap.
Trust had payable for incentive fees (in Dollars)	0		$ 0		$ 0
Trust had payable for management fees (in Dollars)	1,511		1,511		8,854
Trust had payable for interest fees (in Dollars)	2,481		2,481		2,107
Trust had payable for trading fees (in Dollars)	80,804		80,804		81,698
Trust had payable for service fees (in Dollars)	35,026		35,026		$ 36,705
Trust paid for incentive fees (in Dollars)	0	0	49,840	$ 0
Trust paid for management fees (in Dollars)	4,595	4,704	9,214	9,724
Trust paid for risk analysis fees (in Dollars)	1,378	1,411	2,764	2,917
Trust paid for service fees (in Dollars)	116,436	152,889	232,549	355,224
Trust paid for trading fees (in Dollars)	$ 241,168	$ 382,254	$ 484,333	$ 772,150
Parent Company [Member] | Class 1AP Units [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of interest in specific series of trust			1.00%
Parent Company [Member] | Class 2a Units [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of interest			1.00%
Parent Company [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of FCM fee	2.25%		2.25%
Percentage of incentive fee	25.00%		25.00%
Parent Company [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	2.00%		2.00%
Parent Company [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2 and Class 3 [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	3.50%		3.50%
Parent Company [Member] | Frontier Global Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of series NAV	0.12%		0.12%
Parent Company [Member] | Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	0.75%		0.75%
Percentage of FCM fee	2.50%		2.50%
Percentage of incentive fee	20.00%		20.00%
Parent Company [Member] | Frontier Select Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of FCM fee	2.25%		2.25%
Class 1 and Class 2 [Member] | Parent Company [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	0.50%		0.50%
Class 1AP, Class 2a and Class 3a [Member] | Parent Company [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of management fee	1.00%		1.00%
Class 1 [Member] | Parent Company [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of service fee	3.00%		3.00%
Class 1a Units [Member] | Parent Company [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of service fee	2.00%		2.00%
Class 2 Units [Member] | Parent Company [Member] | Managing Owner [Member]
Transactions with Affiliates (Details) [Line Items]
Percentage of service fee	0.25%		0.25%

Transactions with Affiliates _2

Transactions with Affiliates (Details) - Schedule of fees earned by managing owner - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees earned by managing owner [Line Items]
Incentive (Rebate) Fees
Management Fee
Service Fee	501	2,943	1,550	10,650
Trading Fee	33,037	57,135	67,974	157,685
Frontier Masters Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees earned by managing owner [Line Items]
Incentive (Rebate) Fees
Management Fee
Service Fee	147	499	357	1,094
Trading Fee	13,305	29,246	28,168	61,645
Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees earned by managing owner [Line Items]
Incentive (Rebate) Fees
Management Fee
Service Fee	58	111	112	222
Trading Fee	10,050	7,765	18,815	17,312
Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees earned by managing owner [Line Items]
Incentive (Rebate) Fees			49,840
Management Fee	4,595	4,704	9,214	9,724
Service Fee	65,729	85,674	132,996	210,982
Trading Fee	109,550	138,508	223,989	223,989
Frontier Select Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees earned by managing owner [Line Items]
Incentive (Rebate) Fees
Management Fee
Service Fee	11,804	17,932	23,242	38,092
Trading Fee	12,010	15,445	23,365	32,400
Frontier Global Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees earned by managing owner [Line Items]
Incentive (Rebate) Fees
Management Fee
Service Fee	20,452	27,786	40,390	58,227
Trading Fee	37,220	52,118	72,350	107,673
Frontier Heritage Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees earned by managing owner [Line Items]
Incentive (Rebate) Fees
Management Fee
Service Fee	17,745	17,944	33,902	35,957
Trading Fee	$ 25,996	$ 28,037	$ 49,672	$ 57,942

Transactions with Affiliates _3

Transactions with Affiliates (Details) - Schedule of fees payable to managing owner - The Series of the Frontier Funds [Member] - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees payable to managing owner [Line Items]
Incentive Fees
Management Fees
Interest Fees
Service Fees	158	385
Trading Fees	10,587	12,576
Frontier Masters Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees payable to managing owner [Line Items]
Incentive Fees
Management Fees
Interest Fees
Service Fees	47	70
Trading Fees	4,440	5,460
Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees payable to managing owner [Line Items]
Incentive Fees
Management Fees
Interest Fees	37	87
Service Fees	20	18
Trading Fees	3,492	2,281
Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees payable to managing owner [Line Items]
Incentive Fees
Management Fees	1,511	8,854
Interest Fees	1,870	1,376
Service Fees	19,481	21,381
Trading Fees	36,556	37,894
Frontier Select Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees payable to managing owner [Line Items]
Incentive Fees
Management Fees
Interest Fees	107	179
Service Fees	3,707	3,709
Trading Fees	4,110	3,933
Frontier Global Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees payable to managing owner [Line Items]
Incentive Fees
Management Fees
Interest Fees	232	326
Service Fees	6,307	6,348
Trading Fees	12,632	11,849
Frontier Heritage Fund [Member]
Transactions with Affiliates (Details) - Schedule of fees payable to managing owner [Line Items]
Incentive Fees
Management Fees
Interest Fees	235	139
Service Fees	5,306	4,794
Trading Fees	$ 8,987	$ 7,705

Transactions with Affiliates _4

Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 6,809	$ 5,857	$ 10,953	$ 11,336
Class 1 [Member] | Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 1 [Member] | Frontier Masters Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 1 [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 3,247	$ 2,221	$ 3,547	$ 4,400
Ratio to Average Net Assets	0.04%	0.01%	0.04%	0.03%
Class 1 [Member] | Frontier Select Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 778	$ 779	$ 1,568	$ 1,733
Ratio to Average Net Assets	0.05%	0.03%	0.10%	0.07%
Class 1 [Member] | Frontier Global Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 649	$ 1,203	$ 2,104	$ 1,748
Ratio to Average Net Assets	0.02%	0.03%	0.08%	0.04%
Class 1 [Member] | Frontier Heritage Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 1,010	$ 728	$ 2,048	$ 1,648
Ratio to Average Net Assets	0.04%	0.03%	0.09%	0.07%
Class 2 [Member] | Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 2 [Member] | Frontier Masters Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 2 [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 7	$ 5	$ 14	$ 8
Ratio to Average Net Assets	0.02%	0.01%	0.04%	0.02%
Class 2 [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 649	$ 425	$ 719	$ 859
Ratio to Average Net Assets	0.04%	0.01%	0.04%	0.03%
Class 2 [Member] | Frontier Select Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 37	$ 26	$ 72	$ 58
Ratio to Average Net Assets	0.05%	0.03%	0.10%	0.07%
Class 2 [Member] | Frontier Global Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 49	$ 110	$ 152	$ 151
Ratio to Average Net Assets	0.02%	0.03%	0.08%	0.05%
Class 2 [Member] | Frontier Heritage Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 103	$ 170	$ 207	$ 388
Ratio to Average Net Assets	0.04%	0.03%	0.09%	0.07%
Class 3 [Member] | Frontier Diversified Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 3 [Member] | Frontier Masters Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 3 [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 181	$ 114	$ 408	$ 196
Ratio to Average Net Assets	0.02%	0.01%	0.04%	0.02%
Class 1a [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 1a [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 7	$ 5
Ratio to Average Net Assets	0.01%	0.00%
Class 2a [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 2a [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner			$ 7	$ 10
Ratio to Average Net Assets			0.01%	0.01%
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%	0.00%	0.00%
Class 3a [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 39	$ 23	$ 42	$ 46
Ratio to Average Net Assets	0.01%	0.00%	0.01%	0.01%
Class 1AP [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 44	$ 31	$ 47	$ 62
Ratio to Average Net Assets	0.04%	0.01%	0.04%	0.03%
Class 1AP [Member] | Frontier Select Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 5	$ 3	$ 10	$ 7
Ratio to Average Net Assets	0.05%	0.03%	0.10%	0.06%
Class 1AP [Member] | Frontier Global Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner		$ 11		$ 16
Ratio to Average Net Assets	0.00%	0.03%	0.00%	0.05%
Class 1AP [Member] | Frontier Heritage Fund [Member]
Transactions with Affiliates (Details) - Schedule of interest paid by each series to managing owner [Line Items]
Gross Amount Paid to the Managing Owner	$ 4	$ 3	$ 8	$ 6
Ratio to Average Net Assets	0.05%	0.03%	0.09%	0.07%

Financial Highlights (Details)

Financial Highlights (Details) - Schedule of financial highlights of trust - The Series of the Frontier Funds [Member] - $ / shares		3 Months Ended			6 Months Ended
		Jun. 30, 2021		Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Class 1 [Member] | Frontier Diversified Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 74.62		$ 79.15	$ 72.68		$ 101.10
Net operating results:
Interest income	[1]	0		0.01	0.03		0.01
Expenses	[1]	(1.61)		(0.85)	(2.49)		(3.31)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.67		(4.22)	7.46		(23.71)
Net income/(loss)	[1]	3.06		(5.06)	5		(27.01)
Net asset value	[1]	$ 77.68		$ 74.09	$ 77.68		$ 74.09
Ratios to average net assets
Net investment income/(loss)		(8.20%)		(3.38%)	(6.71%)		(7.10%)
Expenses before incentive fees	[2],[3]	8.20%		3.41%	6.80%		7.12%
Expenses after incentive fees	[2],[3]	8.20%		3.41%	6.80%		7.12%
Total return before incentive fees	[4]	4.10%		(6.39%)	6.88%		(26.71%)
Total return after incentive fees	[4]	4.10%		(6.39%)	6.88%		(26.71%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1 [Member] | Frontier Masters Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 57.44		$ 71.34	$ 55.18		$ 72.28
Net operating results:
Interest income	[1]	0.07		0.02	0.11		0.05
Expenses	[1]	(1.73)		(3.81)	(3.75)		(8.37)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(55.78)	[5]	(5.63)	(51.54)	[5]	(2.04)
Net income/(loss)	[1]	(57.44)	[5]	(9.42)	(55.18)	[5]	(10.36)
Net asset value	[1]		[5]	$ 61.92		[5]	$ 61.92
Ratios to average net assets
Net investment income/(loss)		(11.62%)		(21.01%)	(13.18%)		(23.98%)
Expenses before incentive fees	[2],[3]	12.07%		21.10%	13.58%		24.13%
Expenses after incentive fees	[2],[3]	12.07%		21.10%	13.58%		24.13%
Total return before incentive fees	[4]	0.47%	[5]	(13.21%)	4.58%	[5]	(14.34%)
Total return after incentive fees	[4]	0.47%	[5]	(13.21%)	4.58%	[5]	(14.34%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1 [Member] | Frontier Balanced Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 83.39		$ 86.02	$ 79.93		$ 117.23
Net operating results:
Interest income	[1]	0		0			0.03
Expenses	[1]	(1.54)		(1.35)	(3.35)		(3.37)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.01		(6.09)	9.28		(35.30)
Net income/(loss)	[1]	2.47		(7.43)	5.93		(38.64)
Net asset value	[1]	$ 85.86		$ 78.59	$ 85.86		$ 78.59
Ratios to average net assets
Net investment income/(loss)		(7.11%)		(4.77%)	(8.05%)		(6.82%)
Expenses before incentive fees	[2],[3]	7.12%		4.77%	7.18%		6.89%
Expenses after incentive fees	[2],[3]	7.12%		4.77%	8.06%		6.89%
Total return before incentive fees	[4]	2.96%		(8.64%)	6.96%		(32.96%)
Total return after incentive fees	[4]	2.96%		(8.64%)	7.42%		(32.96%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1 [Member] | Frontier Select Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 62.56		$ 67.48	$ 58.55		$ 66.56
Net operating results:
Interest income	[1]	0		0			0
Expenses	[1]	(0.96)		(0.83)	(1.82)		(1.80)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.57		(5.60)	9.44		(3.71)
Net income/(loss)	[1]	3.61		(6.44)	7.62		(5.52)
Net asset value	[1]	$ 66.17		$ 61.04	$ 66.17		$ 61.04
Ratios to average net assets
Net investment income/(loss)		(5.91%)		(4.89%)	(5.88%)		(5.46%)
Expenses before incentive fees	[2],[3]	5.91%		4.89%	5.88%		5.46%
Expenses after incentive fees	[2],[3]	5.91%		4.89%	5.88%		5.46%
Total return before incentive fees	[4]	5.77%		(9.54%)	13.01%		(8.29%)
Total return after incentive fees	[4]	5.77%		(9.54%)	13.01%		(8.29%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1 [Member] | Frontier Global Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 114.32			$ 110.90		$ 131.52
Net operating results:
Interest income	[1]	0					0
Expenses	[1]	(2.45)			(4.65)		(5.46)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.41			11.03		(4.38)
Net income/(loss)	[1]	2.96			6.38		(9.84)
Net asset value	[1]	$ 117.28		$ 121.68	$ 117.28		$ 121.68
Ratios to average net assets
Net investment income/(loss)		(8.09%)			(8.02%)		(8.08%)
Expenses before incentive fees	[2],[3]	8.09%			8.02%		8.08%
Expenses after incentive fees	[2],[3]	8.09%			8.02%		8.08%
Total return before incentive fees	[4]	2.59%			5.75%		(7.48%)
Total return after incentive fees	[4]	2.59%			5.75%		(7.48%)
Incentive fee per share
Incentive Fee to ANA							0.00%
Class 1 [Member] | Frontier Heritage Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 103.77		114.21	$ 96.10		$ 97.54
Net operating results:
Interest income	[1]	0		0			0
Expenses	[1]	(1.93)		(1.76)	(3.67)		(3.60)
Net gain/(loss) on investments, net of non-controlling interests	[1]	7.42		(15.94)	16.83		2.57
Net income/(loss)	[1]	5.49		(17.70)	13.16		(1.03)
Net asset value	[1]	$ 109.26		$ 96.51	$ 109.26		$ 96.51
Ratios to average net assets
Net investment income/(loss)		(6.98%)		(6.79%)	(6.99%)		(6.90%)
Expenses before incentive fees	[2],[3]	6.98%		6.79%	6.99%		6.90%
Expenses after incentive fees	[2],[3]	6.98%		6.79%	6.99%		6.90%
Total return before incentive fees	[4]	5.29%		(15.50%)	13.69%		(1.05%)
Total return after incentive fees	[4]	5.29%		(15.50%)	13.69%		(1.05%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1 [Member] | Frontier Global Fund [Member]
Per unit operating performance (1)
Net asset value	[1]			$ 145.97
Net operating results:
Interest income	[1]			0
Expenses	[1]			(2.53)
Net gain/(loss) on investments, net of non-controlling interests	[1]			(21.76)
Net income/(loss)	[1]			(24.29)
Net asset value	[1]			$ 121.68			$ 121.68
Ratios to average net assets
Net investment income/(loss)				(7.44%)
Expenses before incentive fees	[2],[3]			7.44%
Expenses after incentive fees	[2],[3]			7.44%
Total return before incentive fees	[4]			(16.64%)
Total return after incentive fees	[4]			(16.64%)
Incentive fee per share
Incentive Fee to ANA				0.00%
Class 2 [Member] | Frontier Diversified Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 91.71		$ 95.60	$ 88.95		121.58
Net operating results:
Interest income	[1]	0		0.01	0.04		0.01
Expenses	[1]	(0.90)		(0.63)	(1.69)		(1.98)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.09		(5.09)	8.60		(29.73)
Net income/(loss)	[1]	4.19		(5.72)	6.95		(31.70)
Net asset value	[1]	$ 95.90		$ 89.88	$ 95.90		$ 89.88
Ratios to average net assets
Net investment income/(loss)		(3.71%)		(2.07%)	(3.58%)		(3.56%)
Expenses before incentive fees	[2],[3]	3.71%		2.10%	3.66%		3.58%
Expenses after incentive fees	[2],[3]	3.71%		2.10%	3.66%		3.58%
Total return before incentive fees	[4]	4.57%		(5.98%)	7.81%		(26.07%)
Total return after incentive fees	[4]	4.57%		(5.98%)	7.81%		(26.07%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2 [Member] | Frontier Masters Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 70.61		$ 86.18	$ 67.54		$ 87.18
Net operating results:
Interest income	[1]	0.08		0.02	0.14		0.06
Expenses	[1]	(1.16)		(1.19)	(2.20)		(2.64)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.99		(9.89)	8.04		(9.48)
Net income/(loss)	[1]	2.91		(11.05)	5.98		(12.05)
Net asset value	[1]	$ 73.52		$ 75.13	$ 73.52		$ 75.13
Ratios to average net assets
Net investment income/(loss)		(5.83%)		(5.36%)	(5.86%)		(6.12%)
Expenses before incentive fees	[2],[3]	6.28%		5.45%	6.26%		6.27%
Expenses after incentive fees	[2],[3]	6.28%		5.45%	6.26%		6.27%
Total return before incentive fees	[4]	4.12%		(12.83%)	8.85%		(13.83%)
Total return after incentive fees	[4]	4.12%		(12.83%)	8.85%		(13.83%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2 [Member] | Frontier Long/Short Commodity Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 90.39		$ 88.66	$ 85.99		$ 81.60
Net operating results:
Interest income	[1]	0.07		0.03	0.16		0.07
Expenses	[1]	(0.70)		(0.48)	(1.29)		(1.09)
Net gain/(loss) on investments, net of non-controlling interests	[1]	8.73		(4.94)	13.63		2.68
Net income/(loss)	[1]	8.10		(5.39)	12.50		1.67
Net asset value	[1]	$ 98.49		$ 83.27	$ 98.49		$ 83.27
Ratios to average net assets
Net investment income/(loss)		(2.53%)		(2.17%)	(2.41%)		(2.43%)
Expenses before incentive fees	[2],[3]	2.81%		2.31%	2.74%		2.59%
Expenses after incentive fees	[2],[3]	2.81%		2.31%	2.74%		2.59%
Total return before incentive fees	[4]	8.96%		(6.08%)	14.54%		2.04%
Total return after incentive fees	[4]	8.96%		(6.08%)	14.54%		2.04%
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2 [Member] | Frontier Balanced Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 137.21		$ 137.37	$ 130.54		$ 185.82
Net operating results:
Interest income	[1]	0		0			0.05
Expenses	[1]	(1.48)		(17.96)	(3.44)		(3.03)
Net gain/(loss) on investments, net of non-controlling interests	[1]	6.61		7.02	15.24		(56.41)
Net income/(loss)	[1]	5.13		(10.93)	11.80		(59.38)
Net asset value	[1]	$ 142.34		$ 126.44	$ 142.34		$ 126.44
Ratios to average net assets
Net investment income/(loss)		(4.11%)		(2.72%)	(5.05%)		(3.83%)
Expenses before incentive fees	[2],[3]	4.11%		2.72%	4.17%		3.90%
Expenses after incentive fees	[2],[3]	4.11%		2.72%	5.05%		3.90%
Total return before incentive fees	[4]	3.74%		(7.96%)	8.58%		(31.96%)
Total return after incentive fees	[4]	3.74%		(7.96%)	9.04%		(31.96%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2 [Member] | Frontier Select Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 101.40		$ 106.15	$ 94.20		$ 103.94
Net operating results:
Interest income	[1]	0		0			0
Expenses	[1]	(0.77)		(0.59)	(1.45)		(1.28)
Net gain/(loss) on investments, net of non-controlling interests	[1]	7.44		(8.81)	15.32		(5.92)
Net income/(loss)	[1]	6.67		(9.40)	13.87		(7.19)
Net asset value	[1]	$ 108.07		$ 96.75	$ 108.07		$ 96.75
Ratios to average net assets
Net investment income/(loss)		(2.90%)		(2.22%)	(2.87%)		(2.46%)
Expenses before incentive fees	[2],[3]	2.90%		2.22%	2.87%		2.46%
Expenses after incentive fees	[2],[3]	2.90%		2.22%	2.87%		2.46%
Total return before incentive fees	[4]	6.58%		(8.86%)	14.72%		(6.92%)
Total return after incentive fees	[4]	6.58%		(8.86%)	14.72%		(6.92%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2 [Member] | Frontier Global Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 174.01		$ 215.64	$ 167.56		$ 192.82
Net operating results:
Interest income	[1]	0		0			0
Expenses	[1]	(2.36)		(2.36)	(4.44)		(5.10)
Net gain/(loss) on investments, net of non-controlling interests	[1]	8.20		(32.19)	16.73		(6.63)
Net income/(loss)	[1]	5.84		(34.55)	12.29		(11.73)
Net asset value	[1]	$ 179.85		$ 181.09	$ 179.85		$ 181.09
Ratios to average net assets
Net investment income/(loss)		(5.09%)		(4.70%)	(5.02%)		(5.08%)
Expenses before incentive fees	[2],[3]	5.09%		4.70%	5.02%		5.08%
Expenses after incentive fees	[2],[3]	5.09%		4.70%	5.02%		5.08%
Total return before incentive fees	[4]	3.36%		(16.02%)	7.33%		(6.08%)
Total return after incentive fees	[4]	3.36%		(16.02%)	7.33%		(6.08%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2 [Member] | Frontier Heritage Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 169.62		$ 181.17	$ 155.92		$ 153.59
Net operating results:
Interest income	[1]	0		0			0
Expenses	[1]	(1.81)		(1.55)	(3.42)		(3.23)
Net gain/(loss) on investments, net of non-controlling interests	[1]	12.12		(25.38)	27.43		3.87
Net income/(loss)	[1]	10.31		(26.93)	24.01		0.65
Net asset value	[1]	$ 179.93		$ 154.24	$ 179.93		$ 154.24
Ratios to average net assets
Net investment income/(loss)		(3.98%)		(3.79%)	(3.99%)		(3.90%)
Expenses before incentive fees	[2],[3]	3.98%		3.79%	3.99%		3.90%
Expenses after incentive fees	[2],[3]	3.98%		3.79%	3.99%		3.90%
Total return before incentive fees	[4]	6.08%		(14.87%)	15.40%		0.42%
Total return after incentive fees	[4]	6.08%		(14.87%)	15.40%		0.42%
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 3 [Member] | Frontier Diversified Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 85.97		$ 89.39	$ 83.33		$ 113.61
Net operating results:
Interest income	[1]	0		0.01	0.04		0.01
Expenses	[1]	(0.84)		(0.58)	(1.58)		(1.76)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.82		(4.72)	8.16		(27.76)
Net income/(loss)	[1]	3.98		(5.30)	6.62		(29.52)
Net asset value	[1]	$ 89.95		$ 84.09	$ 89.95		$ 84.09
Ratios to average net assets
Net investment income/(loss)		(3.71%)		(2.07%)	(3.58%)		(3.56%)
Expenses before incentive fees	[2],[3]	3.71%		2.10%	3.66%		3.58%
Expenses after incentive fees	[2],[3]	3.71%		2.10%	3.66%		3.58%
Total return before incentive fees	[4]	4.63%		(5.93%)	7.94%		(25.98%)
Total return after incentive fees	[4]	4.63%		(5.93%)	7.94%		(25.98%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 3 [Member] | Frontier Masters Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 66.45		$ 80.89	$ 63.52		$ 81.78
Net operating results:
Interest income	[1]	0.08		0.02	0.13		0.06
Expenses	[1]	(1.09)		(1.12)	(2.07)		(2.47)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.79		(9.23)	7.65		(8.81)
Net income/(loss)	[1]	2.78		(10.33)	5.71		(11.22)
Net asset value	[1]	$ 69.23		$ 70.56	$ 69.23		$ 70.56
Ratios to average net assets
Net investment income/(loss)		(5.83%)		(5.36%)	(5.86%)		(6.12%)
Expenses before incentive fees	[2],[3]	6.28%		5.45%	6.26%		6.27%
Expenses after incentive fees	[2],[3]	6.28%		5.45%	6.26%		6.27%
Total return before incentive fees	[4]	4.18%		(12.77%)	8.99%		(13.72%)
Total return after incentive fees	[4]	4.18%		(12.77%)	8.99%		(13.72%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 3 [Member] | Frontier Long/Short Commodity Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 94.82		$ 93.01	$ 90.21		$ 85.64
Net operating results:
Interest income	[1]	0.07		0.03	0.16		0.07
Expenses	[1]	(0.73)		(0.51)	(1.35)		(1.14)
Net gain/(loss) on investments, net of non-controlling interests	[1]	9.16		(5.18)	14.30		2.78
Net income/(loss)	[1]	8.50		(5.66)	13.11		1.71
Net asset value	[1]	$ 103.32		$ 87.35	$ 103.32		$ 87.35
Ratios to average net assets
Net investment income/(loss)		(2.53%)		(2.17%)	(2.41%)		(2.43%)
Expenses before incentive fees	[2],[3]	2.81%		2.31%	2.74%		2.59%
Expenses after incentive fees	[2],[3]	2.81%		2.31%	2.74%		2.59%
Total return before incentive fees	[4]	8.96%		(6.08%)	14.53%		2.00%
Total return after incentive fees	[4]	8.96%		(6.08%)	14.53%		2.00%
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2a [Member] | Frontier Long/Short Commodity Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 58.49		$ 56.98	$ 55.29		$ 52.55
Net operating results:
Interest income	[1]	0.05		0.02	0.10		0.04
Expenses	[1]	(0.45)		(0.31)	(0.83)		(0.70)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.65		(3.21)	9.18		1.60
Net income/(loss)	[1]	5.25		(3.50)	8.45		0.94
Net asset value	[1]	$ 63.74		$ 53.49	$ 63.74		$ 53.49
Ratios to average net assets
Net investment income/(loss)		(2.53%)		(2.17%)	(2.41%)		(2.43%)
Expenses before incentive fees	[2],[3]	2.81%		2.31%	2.74%		2.59%
Expenses after incentive fees	[2],[3]	2.81%		2.31%	2.74%		2.59%
Total return before incentive fees	[4]	8.98%		(6.14%)	15.28%		1.79%
Total return after incentive fees	[4]	8.98%		(6.14%)	15.28%		1.79%
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 2a [Member] | Frontier Balanced Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 118.98		$ 119.07	$ 113.20		$ 161.04
Net operating results:
Interest income	[1]	0		0			0.05
Expenses	[1]	(1.28)		(1.06)	(2.98)		(2.64)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.77		(8.40)	13.25		(48.84)
Net income/(loss)	[1]	4.49		(9.46)	10.27		(51.43)
Net asset value	[1]	$ 123.47		$ 109.61	$ 123.47		$ 109.61
Ratios to average net assets
Net investment income/(loss)		(4.11%)		(2.72%)	(5.05%)		(3.83%)
Expenses before incentive fees	[2],[3]	4.11%		2.72%	4.17%		3.90%
Expenses after incentive fees	[2],[3]	4.11%		2.72%	5.05%		3.90%
Total return before incentive fees	[4]	3.77%		(7.94%)	8.61%		(31.94%)
Total return after incentive fees	[4]	3.77%		(7.94%)	9.07%		(31.94%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member]
Per unit operating performance (1)
Net asset value	[1]			$ 60.02	$ 58.37		$ 55.31
Net operating results:
Interest income	[1]			0.02	0.11		0.05
Expenses	[1]			(0.33)	(0.88)		(0.74)
Net gain/(loss) on investments, net of non-controlling interests	[1]			(3.33)	9.76		1.76
Net income/(loss)	[1]			(3.64)	8.99		1.07
Net asset value	[1]	$ 67.36		$ 56.38	$ 67.36		$ 56.38
Ratios to average net assets
Net investment income/(loss)				(2.17%)	(2.41%)		(2.43%)
Expenses before incentive fees	[2],[3]			2.31%	2.74%		2.59%
Expenses after incentive fees	[2],[3]			2.31%	2.74%		2.59%
Total return before incentive fees	[4]			(6.06%)	15.40%		1.94%
Total return after incentive fees	[4]			(6.06%)	15.40%		1.94%
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 3a [Member] | Frontier Balanced Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	118.58		$ 118.66	$ 112.81		$ 160.50
Net operating results:
Interest income	[1]	0		0			0.05
Expenses	[1]	(1.28)		(1.05)	(2.99)		(2.62)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.75		(8.37)	13.23		(48.69)
Net income/(loss)	[1]	4.47		(9.42)	10.24		(51.26)
Net asset value	[1]	$ 123.05		$ 109.24	$ 123.05		$ 109.24
Ratios to average net assets
Net investment income/(loss)		(4.11%)		(2.72%)	(5.05%)		(3.83%)
Expenses before incentive fees	[2],[3]	4.11%		2.72%	4.17%		3.90%
Expenses after incentive fees	[2],[3]	4.11%		2.72%	5.05%		3.90%
Total return before incentive fees	[4]	3.77%		(7.94%)	8.62%		(31.94%)
Total return after incentive fees	[4]	3.77%		(7.94%)	9.08%		(31.94%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 3a [Member] | Frontier Long/Short Commodity Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 61.77
Net operating results:
Interest income	[1]	0.05
Expenses	[1]	(0.48)
Net gain/(loss) on investments, net of non-controlling interests	[1]	6.02
Net income/(loss)	[1]	5.59
Net asset value	[1]	$ 67.36			$ 67.36
Ratios to average net assets
Net investment income/(loss)		(2.53%)
Expenses before incentive fees	[2],[3]	2.81%
Expenses after incentive fees	[2],[3]	2.81%
Total return before incentive fees	[4]	9.05%
Total return after incentive fees	[4]	9.05%
Class 1AP [Member] | Frontier Balanced Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 101.75		$ 101.87	96.81		$ 137.81
Net operating results:
Interest income	[1]	0		0			0.04
Expenses	[1]	(1.10)		(0.90)	(2.56)		(2.25)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.90		(7.21)	11.30		(41.84)
Net income/(loss)	[1]	3.80		(8.11)	8.74		(44.05)
Net asset value	[1]	$ 105.55		$ 93.76	$ 105.55		$ 93.76
Ratios to average net assets
Net investment income/(loss)		(4.11%)		(2.72%)	(5.05%)		(3.83%)
Expenses before incentive fees	[2],[3]	4.11%		2.72%	4.17%		3.90%
Expenses after incentive fees	[2],[3]	4.11%		2.72%	5.05%		3.90%
Total return before incentive fees	[4]	3.73%		(7.96%)	8.56%		(31.96%)
Total return after incentive fees	[4]	3.73%		(7.96%)	9.03%		(31.96%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1AP [Member] | Frontier Select Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 76.41		$ 79.99	$ 70.99		$ 78.51
Net operating results:
Interest income	[1]	0		0			0
Expenses	[1]	(0.58)		(0.45)	(1.09)		(0.96)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.61		(6.64)	11.54		(4.65)
Net income/(loss)	[1]	5.03		(7.09)	10.45		(5.61)
Net asset value	[1]	$ 81.44		$ 72.90	$ 81.44		$ 72.90
Ratios to average net assets
Net investment income/(loss)		(2.90%)		(2.22%)	(2.87%)		(2.46%)
Expenses before incentive fees	[2],[3]	2.90%		2.22%	2.87%		2.46%
Expenses after incentive fees	[2],[3]	2.90%		2.22%	2.87%		2.46%
Total return before incentive fees	[4]	6.58%		(8.86%)	14.72%		(7.15%)
Total return after incentive fees	[4]	6.58%		(8.86%)	14.72%		(7.15%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1AP [Member] | Frontier Global Fund [Member]
Per unit operating performance (1)
Net asset value	[1]			$ 173.08			$ 154.43
Net operating results:
Interest income	[1]			0			0
Expenses	[1]			(1.89)			(4.07)
Net gain/(loss) on investments, net of non-controlling interests	[1]			(25.83)			(5)
Net income/(loss)	[1]			(27.73)			(9.08)
Net asset value	[1]			$ 145.35			$ 145.35
Ratios to average net assets
Net investment income/(loss)				(4.70%)			(5.08%)
Expenses before incentive fees	[2],[3]			4.70%			5.08%
Expenses after incentive fees	[2],[3]			4.70%			5.08%
Total return before incentive fees	[4]			(16.02%)			(5.88%)
Total return after incentive fees	[4]			(16.02%)			(5.88%)
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1AP [Member] | Frontier Heritage Fund [Member]
Per unit operating performance (1)
Net asset value	[1]	$ 126.74		$ 135.37	$ 116.50		$ 114.15
Net operating results:
Interest income	[1]	0		0			0
Expenses	[1]	(1.35)		(1.16)	(2.55)		(2.41)
Net gain/(loss) on investments, net of non-controlling interests	[1]	9.06		(18.96)	20.50		3.51
Net income/(loss)	[1]	7.71		(20.12)	17.95		1.10
Net asset value	[1]	$ 134.45		$ 115.25	$ 134.45		$ 115.25
Ratios to average net assets
Net investment income/(loss)		(3.98%)		(3.79%)	(3.99%)		(3.90%)
Expenses before incentive fees	[2],[3]	3.98%		3.79%	3.99%		3.90%
Expenses after incentive fees	[2],[3]	3.98%		3.79%	3.99%		3.90%
Total return before incentive fees	[4]	6.08%		(14.87%)	15.41%		0.96%
Total return after incentive fees	[4]	6.08%		(14.87%)	15.41%		0.96%
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
Class 1a [Member] | Frontier Long/Short Commodity Fund [Member]
Per unit operating performance (1)
Net asset value	[1]			$ 47.69			$ 44.20
Net operating results:
Interest income	[1]			0.02			0.04
Expenses	[1]			(0.69)			(1.44)
Net gain/(loss) on investments, net of non-controlling interests	[1]			(2.45)			1.77
Net income/(loss)	[1]			(3.12)			0.37
Net asset value	[1]			$ 44.58			$ 44.58
Ratios to average net assets
Net investment income/(loss)				(5.96%)			(6.23%)
Expenses before incentive fees	[2],[3]			6.10%			6.39%
Expenses after incentive fees	[2],[3]			6.10%			6.39%
Total return before incentive fees	[4]			(6.55%)			0.83%
Total return after incentive fees	[4]			(6.55%)			0.83%
Incentive fee per share
Incentive Fee to ANA				0.00%			0.00%
[1]	Interest income and expenses per unit are calculated by dividing these amounts by the average number of units outstanding during the period. The net gain/(loss) on investments, net of non-controlling interests is a balancing amount necessary to reconcile the change in net asset value per unit with the other per unit information.
[2]	Expense ratios do not include management and incentive fees at the Galaxy Plus entities. The ratios would have been higher had those expenses been included. The impact of those fees are included in the total return.
[3]	Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Statements of Operations of the Series, see footnote 6.
[4]	Impact of incentive fee computed using average net assets, otherwise computed using average units outstanding during the period prior to the effects of any non-controlling transactions. An owner’s total returns may vary from the above returns based on the timing of contributions and withdrawals. Total returns are not annualized.
[5]	Class 1 of Frontier Master Fund was liquidated as of April 1, 2021.

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details) - Frontier Fund [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments and Hedging Activities (Details) [Line Items]
Monthly average of forwards, options and futures contracts bought	$ 179	$ 507	$ 484	$ 568
Monthly average of forwards, options and futures contracts sold	$ 185	$ 354	$ 486	$ 490
Minimum [Member]
Derivative Instruments and Hedging Activities (Details) [Line Items]
Percentage of embedded management fees	1.00%		1.00%
Percentage of fair value of swaps and embedded incentive fees	15.00%		15.00%
Maximum [Member]
Derivative Instruments and Hedging Activities (Details) [Line Items]
Percentage of embedded management fees	1.50%		1.50%
Percentage of fair value of swaps and embedded incentive fees	25.00%		25.00%

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities (Details) - Schedule of averages futures contracts - The Series of the Frontier Funds [Member] - Frontier Balanced Fund [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments and Hedging Activities (Details) - Schedule of averages futures contracts [Line Items]
Derivative Numbers of Instruments Bought	179	507	484	568
Derivative Numbers of Instruments Sold	185	354	486	490

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities (Details) - Schedule of realized trading revenue from futures, forwards and options - Frontier Balanced Fund [Member] - The Series of the Frontier Funds [Member] - Realized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Realized trading income/(loss)	[1]	$ 109,163	$ (221,676)	$ 480,722	$ 420,559
Agriculturals [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized trading income/(loss)		46,003	(27,242)	109,315	25,052
Currencies [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized trading income/(loss)		23,445	(3,074)	(4,367)	(89,048)
Energies [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized trading income/(loss)		16,610	(9,668)	51,430	14,070
Interest rates [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized trading income/(loss)		9,688	(113,962)	100,159	128,434
Metals [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized trading income/(loss)		(52)	10,260	23,283	316,370
Stock indices [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized trading income/(loss)		$ 13,469	$ (77,990)	$ 200,902	$ 25,681
[1]	Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss - Frontier Balanced Fund [Member] - The Series of the Frontier Funds [Member] - Unrealized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)	[1]	$ (122,628)	$ (51,316)	$ (169,963)	$ (77,034)
Agriculturals [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(44,481)	32,288	(37,679)	14,916
Currencies [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(30,413)	(49,704)	(13,362)	(20,473)
Energies [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(2,700)	(1,630)	13,900	(4,275)
Interest rates [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(15,689)	44,437	(95,245)	36,412
Metals [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(18,299)	(86,875)	(34,021)	(113,782)
Stock indices [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		$ (11,046)	$ 10,168	$ (3,556)	$ 10,168
[1]	Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit)

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities (Details) - Schedule of gross and net information about the trust's assets and liabilities - Frontier Balanced Fund [Member] - The Series of the Frontier Funds [Member] - Open Trade Equity/(Deficit) [Member] - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities (Details) - Schedule of gross and net information about the trust's assets and liabilities [Line Items]
Gross Amounts of recognized Derivative Assets/ Liabilities	$ 401,858	$ 814,743
Gross Amounts offset in the Statements of Financial Condition	(473,290)	(714,303)
Net Amounts Presented in the Statements of Financial Condition	$ (71,432)	$ 100,440

Trading Activities and Relate_2

Trading Activities and Related Risks (Details)	6 Months Ended
	Jun. 30, 2021
The Series of Frontier Funds [Member]
Trading Activities and Related Risks (Details) [Line Items]
Description of trading activities and related risks	If the markets should move against all of the futures positions held by a Trading Company or Galaxy Plus entity in respect of any Series at the same time, and if the Trading Advisor(s) of such Trading Company or Galaxy Plus entity are unable to offset such futures interests positions, such Trading Company or Galaxy Plus entity could lose all of its assets and the holders of Units of such Series would realize a 100% loss. The Managing Owner will seek to minimize market risk through real-time monitoring of open positions and the level of diversification of each Trading Advisor’s portfolio. It is anticipated that any Trading Advisor’s margin-to-equity ratio will typically not exceed approximately 35% although the actual ratio could be higher or lower from time to time.
Frontier Funds [Member]
Trading Activities and Related Risks (Details) [Line Items]
Description of trading activities and related risks	If the markets should move against all of the futures positions held by a Trading Company or Galaxy Plus entity in respect of any Series at the same time, and if the Trading Advisor(s) of such Trading Company or Galaxy Plus entity are unable to offset such futures interests positions, such Trading Company or Galaxy Plus entity could lose all of its assets and the holders of Units of such Series would realize a 100% loss. The Managing Owner will seek to minimize market risk through real-time monitoring of open positions and the level of diversification of each Trading Advisor’s portfolio. It is anticipated that any Trading Advisor’s margin- to-equity ratio will typically not exceed approximately 35% although the actual ratio could be higher or lower from time to time.

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event [Member] - USD ($)	1 Months Ended
	Aug. 10, 2021	Aug. 05, 2021
Frontier Balanced Fund [Member] | The Series of the Frontier Funds [Member]
Subsequent Events (Details) [Line Items]
Trust paid in redemptions		$ 187,452
Frontier Diversified Fund [Member] | The Series of the Frontier Funds [Member]
Subsequent Events (Details) [Line Items]
Trust paid in redemptions		73,672
Frontier Heritage Fund [Member] | The Series of the Frontier Funds [Member]
Subsequent Events (Details) [Line Items]
Trust paid in redemptions		13,637
Frontier Masters Fund [Member] | The Series of the Frontier Funds [Member]
Subsequent Events (Details) [Line Items]
Trust paid in redemptions		19,199
Frontier Select Fund [Member] | The Series of the Frontier Funds [Member]
Subsequent Events (Details) [Line Items]
Trust paid in redemptions		20,580
Frontier Global Fund [Member] | The Series of the Frontier Funds [Member]
Subsequent Events (Details) [Line Items]
Trust paid in redemptions		$ 35,171
The Trust [Member] | Frontier Funds [Member]
Subsequent Events (Details) [Line Items]
Trust paid of redemptions	$ 349,711

Fair Value Measurements (Deta_5

Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value (Frontier Funds) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value (Frontier Funds) [Line Items]
Open Trade Equity (Deficit)		$ 100,440
Frontier Funds [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value (Frontier Funds) [Line Items]
Open Trade Equity (Deficit)	$ (71,432)
U.S. Treasury Securities	1,490,213	2,282,606
Level 1 Inputs [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value (Frontier Funds) [Line Items]
Open Trade Equity (Deficit)		100,440
Level 1 Inputs [Member] | Frontier Funds [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value (Frontier Funds) [Line Items]
Open Trade Equity (Deficit)	(71,432)
U.S. Treasury Securities	1,490,213	2,282,606
Level 2 Inputs [Member] | Frontier Funds [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value (Frontier Funds) [Line Items]
Open Trade Equity (Deficit)
U.S. Treasury Securities
Level 3 Inputs [Member] | Frontier Funds [Member]
Fair Value Measurements (Details) - Schedule of financial asset portfolio measured at fair value (Frontier Funds) [Line Items]
Open Trade Equity (Deficit)
U.S. Treasury Securities

Fair Value Measurements (Deta_6

Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) (Frontier Funds) - Level 3 Inputs [Member] - Frontier Funds [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
Fair Value Measurements (Details) - Schedule of change in unrealized appreciation (depreciation) (Frontier Funds) [Line Items]
Beginning, Balance of recurring Level 3 assets	$ 21,579,865
Total gains or losses (realized/unrealized):
Included in earnings-realized	(2,896,106)
Included in earnings-unrealized	(4,384,210)
Proceeds from collateral reduction	(12,674,502)
Purchase of investments	12,918,207
Sale of investments	(14,543,254)
Transfers in and/or out of Level 3
Ending, Balance of recurring Level 3 assets

Swap Contracts (Details) - Sc_2

Swap Contracts (Details) - Schedule of Investments in following swap - DeutscheBank AG [Member] - Swap [Member] - Parent Company [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
XXXIV Balanced Select Swap [Member]
Swap Contracts (Details) - Schedule of Investments in following swap [Line Items]
Realized Gain/(Loss)	$ (2,448,166)
Change in Unrealized Gain/(Loss)	(3,088,917)
Fair Value as of December 31, 2020	0
Advance on swap appreciation	0
XXXV Diversified Select Swap [Member]
Swap Contracts (Details) - Schedule of Investments in following swap [Line Items]
Realized Gain/(Loss)	(446,306)
Change in Unrealized Gain/(Loss)	(1,537,399)
Fair Value as of December 31, 2020	0
Advance on swap appreciation	0
XXXVII L/S Select Swap [Member]
Swap Contracts (Details) - Schedule of Investments in following swap [Line Items]
Realized Gain/(Loss)	188,100
Change in Unrealized Gain/(Loss)	44,277
Fair Value as of December 31, 2020	0
Advance on swap appreciation	0
Brevan Howard [Member]
Swap Contracts (Details) - Schedule of Investments in following swap [Line Items]
Realized Gain/(Loss)	(189,734)
Change in Unrealized Gain/(Loss)	197,829
Fair Value as of December 31, 2020	0
Advance on swap appreciation	$ 0

Investments in Private Investme

Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies - Frontier Funds [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	$ (60,539)	$ (121,186)	$ (114,485)	$ (121,186)
Realized Gain/(Loss)	1,101,488	(1,925,424)	1,970,402	(2,149,376)
Change in Unrealized Gain/(Loss)	351,443	(859,278)	762,901	(8,546)
Net Income (Loss)	1,392,392	(2,905,888)	2,618,818	(2,279,108)
Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(4,958)	(21,691)	(11,520)	(21,691)
Realized Gain/(Loss)	231,375	(519,973)	679,178	42,043
Change in Unrealized Gain/(Loss)	152,986	(1,037,995)	83,059	(129,090)
Net Income (Loss)	379,403	(1,579,659)	750,717	(108,738)
Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions		(3,500)		(3,500)
Realized Gain/(Loss)	(349)	(78,517)	(349)	(95,347)
Change in Unrealized Gain/(Loss)		103,958		41,672
Net Income (Loss)	(349)	21,941	(349)	(57,175)
Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions		(13,005)		(13,005)
Realized Gain/(Loss)	497	(585,571)	497	(1,475,050)
Change in Unrealized Gain/(Loss)		598,718		175,801
Net Income (Loss)	497	142	497	(1,312,254)
Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(9,320)	(27,104)	(19,318)	(27,104)
Realized Gain/(Loss)	214,715	(714,036)	359,226	(526,102)
Change in Unrealized Gain/(Loss)	159,237	924,235	(147,084)	269,144
Net Income (Loss)	364,632	183,095	192,824	(284,062)
Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(194)	(1,483)	(423)	(1,483)
Realized Gain/(Loss)	99,422	(505,536)	122,971	(493,489)
Change in Unrealized Gain/(Loss)	(84,645)	506,325	(102,977)	(49,824)
Net Income (Loss)	14,583	(694)	19,571	(544,796)
Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(3,616)	(12,396)	(6,755)	(12,396)
Realized Gain/(Loss)	(24,422)	(884,231)	(253,977)	(912,054)
Change in Unrealized Gain/(Loss)	(215,896)	428,859	(210,527)	97,338
Net Income (Loss)	(243,934)	(467,768)	(471,259)	(827,112)
Galaxy Plus Fund - Quantmetrics Feeder Fund (527) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)
Net Income (Loss)
Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(6,918)	(3,215)	(14,004)	(3,215)
Realized Gain/(Loss)	98,635	145,551	178,075	110,349
Change in Unrealized Gain/(Loss)	(36,398)	(349,745)	163,774	(48,759)
Net Income (Loss)	55,319	(207,409)	327,844	58,375
Galaxy Plus Fund - Quest FIT Feeder Fund (535) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	(13,415)		44,734
Net Income (Loss)	(13,415)		44,734
Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions		(7,243)		(7,243)
Realized Gain/(Loss)	1,384	(310,899)	1,384	(321,982)
Change in Unrealized Gain/(Loss)		318,142		(43,412)
Net Income (Loss)	1,384		1,384	(372,637)
Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(30,735)	(31,549)	(54,152)	(31,549)
Realized Gain/(Loss)	330,694	1,527,788	1,651,699	1,522,256
Change in Unrealized Gain/(Loss)	452,321	(2,351,775)	306,252	(321,416)
Net Income (Loss)	752,280	(855,536)	1,903,799	1,169,291
Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(2,097)		(3,804)
Realized Gain/(Loss)	128,578		(789,261)
Change in Unrealized Gain/(Loss)	(99,354)		617,622
Net Income (Loss)	27,127		(175,443)
Galaxy Plus Fund - Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Investments in Private Investment Companies (Details) - Schedule of equity in earnings from unconsolidated trading companies and private investment companies [Line Items]
Trading Commissions	(2,701)		(4,509)
Realized Gain/(Loss)	20,959		20,959
Change in Unrealized Gain/(Loss)	36,607		8,048
Net Income (Loss)	$ 54,865		$ 24,499

Investments in Private Invest_2

Investments in Private Investment Companies (Details) - Schedule of private investment companies have certain redemption and liquidity restrictions - Frontier Funds [Member]	6 Months Ended
	Jun. 30, 2021
Multi-Strategy [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC [Member]
Frontier Funds
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Frontier Funds
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC [Member]
Frontier Funds
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Frontier Funds
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Frontier Funds
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Frontier Funds
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Frontier Funds
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None

Financial Highlights (Details_2

Financial Highlights (Details) - Schedule of financial highlights of trust - Frontier Funds [Member]		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Ratios to average net assets (1)
Net investment income/(loss)	[1]	(5.99%)	(4.34%)	(6.19%)	(5.71%)
Expenses before incentive fees	[2]	6.03%	(4.36%)	6.04%	5.76%
Expenses after incentive fees	[2]	6.03%	(4.36%)	6.24%	5.76%
Total return before incentive fees	[3]	4.14%	(7.79%)	8.91%	(23.21%)
Total return after incentive fees	[3]	4.14%	(7.79%)	8.70%	(23.21%)
[1]	Annualized with the exception of incentive fees.
[2]	Expense ratios do not reflect interest allocated to the Managing Owner as such expenses are not included in the Consolidated Statements of Operations of the Trust. See footnote 5.
[3]	Total returns are not annualized.

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities (Details) - Schedule of realized trading revenue from futures, forwards and options - Frontier Fund [Member] - Realized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Type of contract
Realized trading income/(loss)	[1]	$ 109,163	$ (221,676)	$ 480,722	$ 420,559
Agriculturals [Member]
Type of contract
Realized trading income/(loss)		46,003	(27,242)	109,315	25,052
Currencies [Member]
Type of contract
Realized trading income/(loss)		23,445	(3,074)	(4,367)	(89,048)
Energies [Member]
Type of contract
Realized trading income/(loss)		16,610	(9,668)	51,430	14,070
Interest rates [Member]
Type of contract
Realized trading income/(loss)		9,688	(113,962)	100,159	128,434
Metals [Member]
Type of contract
Realized trading income/(loss)		(52)	10,260	23,283	316,370
Stock indices [Member]
Type of contract
Realized trading income/(loss)		$ 13,469	$ (77,990)	$ 200,902	$ 25,681
[1]	Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.

Derivative Instruments and He_9

Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss - Frontier Fund [Member] - Net Change in Open Trade Equity from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)	[1]	$ (122,628)	$ (51,316)	$ (169,963)	$ (77,034)
Agriculturals [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(44,481)	32,288	(37,679)	14,916
Currencies [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(30,413)	(49,704)	(13,362)	(20,473)
Energies [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(2,700)	(1,630)	13,900	(4,275)
Interest rates [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(15,689)	44,437	(95,245)	36,412
Metals [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		(18,299)	(86,875)	(34,021)	(113,782)
Stock indices [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of net trading gain loss [Line Items]
Change in unrealized trading income/(loss)		$ (11,046)	$ 10,168	$ (3,556)	$ 10,168
[1]	Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit)

Derivative Instruments and H_10

Derivative Instruments and Hedging Activities (Details) - Schedule of gross and net information about the Trust's assets and liabilities - Frontier Funds [Member] - Open Trade Equity/(Deficit) [Member] - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities (Details) - Schedule of gross and net information about the Trust's assets and liabilities [Line Items]
Gross Amounts of recognized Derivative Assets/Liabilities	$ 401,858
Gross Amounts offset in the Statements of Financial Condition	(473,290)
Net Amounts Presented in the Statements of Financial Condition	$ (71,432)
Frontier Balanced Fund [Member]
Derivative Instruments and Hedging Activities (Details) - Schedule of gross and net information about the Trust's assets and liabilities [Line Items]
Gross Amounts of recognized Derivative Assets/Liabilities		$ 814,743
Gross Amounts offset in the Statements of Financial Condition		(714,303)
Net Amounts Presented in the Statements of Financial Condition		$ 100,440