Frontier Funds 10-Q 17 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 01, 2021
Document and Entity Information [Abstract]
Entity Registrant Name	Frontier Funds
Entity Central Index Key	0001261379
Document Type	10-Q
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Document Period End Date	Mar. 31, 2021
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity File Number	000-51274
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		0

Statements of Financial Conditi

Statements of Financial Condition - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Frontier Funds [Member]
ASSETS
Cash and cash equivalents	$ 455,671	$ 468,466
U.S. Treasury securities, at fair value	753,617	2,282,606
Open trade equity, at fair value	53,107	100,440
Receivable from futures commission merchants	741,397	233,973
Investments in private investment companies, at fair value	23,186,879	23,089,312
Interest receivable	5,127	45,578
Receivable from related parties		26,129
Redemptions receivable from private investment companies	159,765	181,323
Total Assets	25,355,563	26,427,827
LIABILITIES
Redemptions payable	18,281	38,128
Incentive fees payable to Managing Owner	49,840
Management fees payable to Managing Owner	1,629	8,854
Interest payable to Managing Owner	1,474	2,107
Service fees payable to Managing Owner	36,796	36,705
Trading fees payable to Managing Owner	83,487	81,698
Risk analysis fees payable	10,898	9,513
Payables to related parties		26,129
Subscriptions in advance for service fee rebates	647,505	638,962
Other liabilities	20,571	16,592
Total Liabilities	870,481	858,688
CAPITAL
Managing Owner Units	267,619	283,217
Limited Owner Units	24,217,463	25,285,922
Total Owners' Capital	24,485,082	25,569,139
Total Liabilities and Capital	25,355,563	26,427,827
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member]
ASSETS
Cash and cash equivalents	73,527	87,715
U.S. Treasury securities, at fair value	121,604	427,393
Investments in private investment companies, at fair value	3,817,118	3,644,603
Investments in unconsolidated trading companies, at fair value	23,731	16,669
Interest receivable	823	8,534
Receivable from related parties		4,892
Redemptions receivable from private investment companies	30,863	31,886
Total Assets	4,067,666	4,221,692
LIABILITIES
Redemptions payable
Interest payable to Managing Owner
Service fees payable to Managing Owner	365	385
Trading fees payable to Managing Owner	12,341	12,576
Subscriptions in advance for service fee rebates	22,650	22,650
Other liabilities	2,590	3,110
Total Liabilities	37,946	38,721
CAPITAL
Total Owners' Capital	4,029,720	4,182,971
Non-Controlling Interests
Total Capital	4,029,720	4,182,971
Total Liabilities and Capital	4,067,666	4,221,692
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 158,366	$ 154,260
Units Outstanding	2,122	2,122
Net Asset Value per Unit	$ 74.62	$ 72.68
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 2,280	$ 2,212
Limited Owner Units	$ 409,718	$ 464,012
Units Outstanding	4,492	5,241
Net Asset Value per Unit	$ 91.71	$ 88.95
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 2a [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 3 [Member]
CAPITAL
Managing Owner Units	$ 40,437	$ 54,405
Limited Owner Units	$ 3,418,919	$ 3,508,082
Units Outstanding	40,241	42,754
Net Asset Value per Unit	$ 85.97	$ 83.33
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 3a [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member]
ASSETS
Cash and cash equivalents	$ 42,138	$ 4,771
U.S. Treasury securities, at fair value	69,690	23,245
Investments in private investment companies, at fair value	883,076	1,014,591
Investments in unconsolidated trading companies, at fair value	13,600	907
Interest receivable	472	464
Receivable from related parties		266
Redemptions receivable from private investment companies	23,149	24,837
Total Assets	1,032,125	1,069,081
LIABILITIES
Redemptions payable		38,128
Interest payable to Managing Owner
Service fees payable to Managing Owner	74	70
Trading fees payable to Managing Owner	5,235	5,460
Subscriptions in advance for service fee rebates	31,725	31,725
Other liabilities	1,485	171
Total Liabilities	38,519	75,554
CAPITAL
Total Owners' Capital	993,606	993,527
Non-Controlling Interests
Total Capital	993,606	993,527
Total Liabilities and Capital	1,032,125	1,069,081
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 10,139	$ 9,740
Units Outstanding	177	177
Net Asset Value per Unit	$ 57.44	$ 55.18
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 2,826	$ 6,265
Limited Owner Units	$ 261,837	$ 257,673
Units Outstanding	3,748	3,908
Net Asset Value per Unit	$ 70.61	$ 67.54
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 2a [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 3 [Member]
CAPITAL
Managing Owner Units	$ 7,498	$ 7,167
Limited Owner Units	$ 711,306	$ 712,682
Units Outstanding	10,818	11,333
Net Asset Value per Unit	$ 66.45	$ 63.52
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 3a [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
ASSETS
Cash and cash equivalents	$ 48,324	$ 93,327
U.S. Treasury securities, at fair value	79,922	454,738
Investments in private investment companies, at fair value	1,200,790	738,053
Investments in unconsolidated trading companies, at fair value	15,597	17,736
Interest receivable	541	9,080
Receivable from related parties		5,205
Redemptions receivable from private investment companies		1,251
Total Assets	1,345,174	1,319,390
LIABILITIES
Redemptions payable	196
Interest payable to Managing Owner	53	87
Service fees payable to Managing Owner		18
Trading fees payable to Managing Owner	3,174	2,281
Subscriptions in advance for service fee rebates	411	393
Other liabilities	1,703	3,308
Total Liabilities	5,537	6,087
CAPITAL
Total Owners' Capital	1,339,637	1,313,303
Non-Controlling Interests
Total Capital	1,339,637	1,313,303
Total Liabilities and Capital	1,345,174	1,319,390
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 4,140	$ 3,939
Limited Owner Units	$ 31,447	$ 30,334
Units Outstanding	394	399
Net Asset Value per Unit	$ 90.39	$ 85.99
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2a [Member]
CAPITAL
Managing Owner Units	$ 8,751	$ 8,274
Limited Owner Units	$ 75,906	$ 76,583
Units Outstanding	1,448	1,535
Net Asset Value per Unit	$ 58.49	$ 55.29
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
CAPITAL
Managing Owner Units
Limited Owner Units	$ 1,008,041	$ 976,771
Units Outstanding	10,631	10,828
Net Asset Value per Unit	$ 94.82	$ 90.21
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3a [Member]
CAPITAL
Managing Owner Units	$ 1,109	$ 1,048
Limited Owner Units	$ 210,243	$ 216,354
Units Outstanding	3,422	3,725
Net Asset Value per Unit	$ 61.77	$ 58.37
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member]
ASSETS
Cash and cash equivalents	$ 104,891	$ 261,803
U.S. Treasury securities, at fair value	173,475	1,275,641
Open trade equity, at fair value	53,107	100,440
Receivable from futures commission merchants	741,397	233,973
Investments in private investment companies, at fair value	10,485,508	10,528,252
Investments in unconsolidated trading companies, at fair value	33,854	49,755
Interest receivable	1,200	25,471
Receivable from related parties		14,602
Redemptions receivable from private investment companies	40,018	55,473
Total Assets	11,633,450	12,545,410
LIABILITIES
Interest payable
Redemptions payable
Incentive fees payable to Managing Owner	49,840
Management fees payable to Managing Owner	1,629	8,854
Interest payable to Managing Owner		1,376
Service fees payable to Managing Owner	20,826	21,381
Trading fees payable to Managing Owner	38,152	37,894
Risk analysis fees payable	10,898	9,513
Payables to related parties
Subscriptions in advance for service fee rebates	352,411	346,855
Other liabilities	8,210	9,258
Total Liabilities	481,966	435,131
CAPITAL
Total Owners' Capital	11,151,484	12,110,279
Non-Controlling Interests
Total Capital	11,151,484	12,110,279
Total Liabilities and Capital	11,633,450	12,545,410
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 8,737,092	$ 9,430,532
Units Outstanding	104,778	117,991
Net Asset Value per Unit	$ 83.39	$ 79.93
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 54,455	$ 51,810
Limited Owner Units	$ 1,639,784	$ 1,906,359
Units Outstanding	12,348	15,000
Net Asset Value per Unit	$ 137.21	$ 130.54
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 2a [Member]
CAPITAL
Managing Owner Units	$ 71,749	$ 75,416
Limited Owner Units	$ 32,543	$ 30,961
Units Outstanding	877	940
Net Asset Value per Unit	$ 118.98	$ 113.20
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 3a [Member]
CAPITAL
Limited Owner Units	$ 503,290	$ 507,148
Units Outstanding	4,244	4,495
Net Asset Value per Unit	$ 118.58	$ 112.81
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1AP
CAPITAL
Limited Owner Units	$ 112,571	$ 108,053
Units Outstanding	1,106	1,116
Net Asset Value per Unit	$ 101.75	$ 96.81
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member]
ASSETS
Cash and cash equivalents	$ 29,713
U.S. Treasury securities, at fair value	49,141
Open trade equity, at fair value
Receivable from futures commission merchants
Investments in private investment companies, at fair value	1,520,376	1,638,665
Investments in unconsolidated trading companies, at fair value	9,590
Interest receivable	333
Receivable from related parties
Redemptions receivable from private investment companies	65,735	67,876
Total Assets	1,674,888	1,706,541
LIABILITIES
Interest payable		179
Redemptions payable	16,207
Incentive fees payable to Managing Owner
Management fees payable to Managing Owner
Interest payable to Managing Owner	359
Service fees payable to Managing Owner	3,803	3,709
Trading fees payable to Managing Owner	3,915	3,933
Risk analysis fees payable
Payables to related parties		26,129
Subscriptions in advance for service fee rebates	19,904	19,463
Other liabilities	1,047
Total Liabilities	45,235	53,413
CAPITAL
Total Owners' Capital	1,629,653	1,653,128
Non-Controlling Interests
Total Capital	1,629,653	1,653,128
Total Liabilities and Capital	1,674,888	1,706,541
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 1,547,969	$ 1,575,328
Units Outstanding	24,745	26,906
Net Asset Value per Unit	$ 62.56	$ 58.55
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 17,653	$ 17,210
Limited Owner Units	$ 54,134	$ 50,769
Units Outstanding	708	722
Net Asset Value per Unit	$ 101.40	$ 94.20
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 2a [Member]
CAPITAL
Managing Owner Units
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 3a [Member]
CAPITAL
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1AP
CAPITAL
Limited Owner Units	$ 9,897	$ 9,821
Units Outstanding	130	138
Net Asset Value per Unit	$ 76.41	$ 70.99
The Series of the Frontier Funds [Member] | Frontier Global Fund
ASSETS
Cash and cash equivalents	$ 86,051	$ 5,694
U.S. Treasury securities, at fair value	142,316	27,742
Investments in private investment companies, at fair value	2,799,957	3,068,656
Investments in unconsolidated trading companies, at fair value	27,774	1,083
Interest receivable	963	554
Receivable from related parties		319
Total Assets	3,057,061	3,104,048
LIABILITIES
Redemptions payable	1,174
Interest payable to Managing Owner	499	326
Service fees payable to Managing Owner	6,559	6,348
Trading fees payable to Managing Owner	12,310	11,849
Subscriptions in advance for service fee rebates	155,675	154,671
Other liabilities	3,032	205
Total Liabilities	179,249	173,399
CAPITAL
Total Owners' Capital	2,877,812	2,930,649
Non-Controlling Interests
Total Capital	2,877,812	2,930,649
Total Liabilities and Capital	3,057,061	3,104,048
The Series of the Frontier Funds [Member] | Frontier Global Fund | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 2,683,941	$ 2,741,972
Units Outstanding	23,477	24,725
Net Asset Value per Unit	$ 114.32	$ 110.90
The Series of the Frontier Funds [Member] | Frontier Global Fund | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 30,498	$ 31,366
Limited Owner Units	$ 163,373	$ 157,311
Units Outstanding	1,114	1,126
Net Asset Value per Unit	$ 174.01	$ 167.56
The Series of the Frontier Funds [Member] | Frontier Global Fund | Class 1AP
CAPITAL
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member]
ASSETS
Cash and cash equivalents	$ 71,027	$ 15,156
U.S. Treasury securities, at fair value	117,469	73,847
Investments in private investment companies, at fair value	2,332,983	2,367,462
Investments in unconsolidated trading companies, at fair value	22,925	2,880
Interest receivable	795	1,475
Receivable from related parties		845
Total Assets	2,545,199	2,461,665
LIABILITIES
Redemptions payable	704
Interest payable to Managing Owner	563	139
Service fees payable to Managing Owner	5,169	4,794
Trading fees payable to Managing Owner	8,360	7,705
Subscriptions in advance for service fee rebates	64,729	63,205
Other liabilities	2,504	540
Total Liabilities	82,029	76,383
CAPITAL
Total Owners' Capital	2,463,170	2,385,282
Non-Controlling Interests
Total Capital	2,463,170	2,385,282
Total Liabilities and Capital	2,545,199	2,461,665
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 2,229,166	$ 2,169,152
Units Outstanding	21,481	22,572
Net Asset Value per Unit	$ 103.77	$ 96.10
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 26,223	$ 24,105
Limited Owner Units	$ 199,696	$ 183,565
Units Outstanding	1,332	1,332
Net Asset Value per Unit	$ 169.62	$ 155.92
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1AP
CAPITAL
Limited Owner Units	$ 8,085	$ 8,460
Units Outstanding	64	73
Net Asset Value per Unit	$ 126.74	$ 116.50

Statements of Operations

Statements of Operations - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member]
Investment income:
Interest - net	$ 1,587	$ 34
Total Income/(loss)	1,587	34
Expenses:
Service Fees - Class 1	1,049	7,707
Due Diligence Fees	1,202	3,383
Trading Fees	34,937	100,550
Total Expenses	37,188	111,640
Investment income/(loss) - net	(35,601)	(111,606)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	192,750	115,286
Net realized gain/(loss) on private investment companies	(45,015)	(149,796)
Net unrealized gain/(loss) on swap contracts		(2,111,698)
Net realized gain/(loss) on U.S. Treasury securities	(1,741)	(16,266)
Net unrealized gain/(loss) on U.S. Treasury securities	(440)	23,218
Change in fair value of investments in unconsolidated trading companies	10,245	(1,009)
Net gain/(loss) on investments	155,799	(2,140,265)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	120,198	(2,251,871)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 120,198	$ (2,251,871)
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 1 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 1.94	$ (21.95)
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 1a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 2 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	2.76	(25.98)
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 2a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 3 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	2.64	(24.22)
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 3a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member]
Investment income:
Interest - net	$ 855	$ 990
Total Income/(loss)	855	990
Expenses:
Service Fees - Class 1	210	595
Due Diligence Fees	291	656
Trading Fees	14,863	32,399
Total Expenses	15,364	33,650
Investment income/(loss) - net	(14,509)	(32,660)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	44,385	246,694
Net realized gain/(loss) on private investment companies	2,640	(235,137)
Net unrealized gain/(loss) on swap contracts
Net realized gain/(loss) on U.S. Treasury securities	(1,004)	7,304
Net unrealized gain/(loss) on U.S. Treasury securities	(250)	(1,929)
Change in fair value of investments in unconsolidated trading companies	12,761	(6,482)
Net gain/(loss) on investments	58,532	10,450
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	44,023	(22,210)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 44,023	$ (22,210)
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 1 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 2.26	$ (0.95)
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 1a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 2 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	3.07	(1)
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 2a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 3 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 2.93	$ (0.89)
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
Investment income:
Interest - net	$ 1,279	$ 647
Total Income/(loss)	1,279	647
Expenses:
Service Fees - Class 1	54	111
Due Diligence Fees	90	93
Trading Fees	8,765	9,547
Total Expenses	8,909	9,751
Investment income/(loss) - net	(7,630)	(9,104)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	62,988	(59,841)
Net realized gain/(loss) on private investment companies	2,596	(67,371)
Net unrealized gain/(loss) on swap contracts		251,441
Net realized gain/(loss) on U.S. Treasury securities	(1,950)	5,194
Net unrealized gain/(loss) on U.S. Treasury securities	(25)	(1,916)
Change in fair value of investments in unconsolidated trading companies	12,123	(4,706)
Net gain/(loss) on investments	75,732	122,801
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	68,102	113,697
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 68,102	$ 113,697
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 1 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 1a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT		3.49
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	4.4	7.06
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	3.2	4.42
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	4.61	7.36
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 3.4	$ 4.71
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member]
Investment income:
Interest - net		$ 6,311
Total Income/(loss)		6,311
Expenses:
Incentive Fees	49,840
Management Fees	4,619	5,020
Risk analysis Fees	1,386	1,506
Service Fees - Class 1	67,267	125,308
Trading Fees	114,439	198,985
Other Fees	56
Total Expenses	237,607	330,819
Investment income/(loss) - net	(237,607)	(324,508)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options	371,559	642,235
Net unrealized gain/(loss) on private investment companies	566,349	(93,693)
Net realized gain/(loss) on private investment companies	(128,881)	(93,600)
Net change in open trade equity/(deficit)	(47,335)	(25,719)
Net realized gain/(loss) on swap contracts		(5,837,508)
Net realized gain/(loss) on U.S. Treasury securities	(621)	20,156
Net unrealized gain/(loss) on U.S. Treasury securities	(252)	1,596
Trading commissions	(5,961)	(8,375)
Change in fair value of investments in unconsolidated trading companies	(14,281)	(23,301)
Net gain/(loss) on investments	740,577	(5,418,209)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	502,970	(5,742,717)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 502,970	$ (5,742,717)
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ (31.21)	$ 3.46
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 2 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	6.67	48.45
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 3a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	5.77	(41.84)
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1AP [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	4.94	(35.94)
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 2a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 5.78	$ (41.97)
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member]
Investment income:
Interest - net
Total Income/(loss)
Expenses:
Incentive Fees
Management Fees
Risk analysis Fees
Service Fees - Class 1	11,438	20,160
Trading Fees	11,355	16,955
Other Fees
Total Expenses	22,793	37,115
Investment income/(loss) - net	(22,793)	(37,115)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options
Net unrealized gain/(loss) on private investment companies	77,023	(22,952)
Net realized gain/(loss) on private investment companies	47,430	7,923
Net change in open trade equity/(deficit)
Net realized gain/(loss) on swap contracts
Net realized gain/(loss) on U.S. Treasury securities	(1,017)	5,292
Net unrealized gain/(loss) on U.S. Treasury securities	(190)	(2,216)
Trading commissions
Change in fair value of investments in unconsolidated trading companies	8,540	93,757
Net gain/(loss) on investments	131,786	81,804
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	108,993	44,689
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 108,993	$ 44,689
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 4.01	$ 0.92
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 2 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	7.2	2.21
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 2a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 3a [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
The Series of the Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1AP [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 5.42	$ 1.49
The Series of the Frontier Funds [Member] | Frontier Global Fund [Member]
Investment income:
Interest - net
Total Income/(loss)
Expenses:
Service Fees - Class 1	19,938	30,441
Trading Fees	35,130	55,555
Total Expenses	55,068	85,996
Investment income/(loss) - net	(55,068)	(85,996)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	92,170	249,122
Net realized gain/(loss) on private investment companies	37,665	309,658
Net unrealized gain/(loss) on swap contracts
Net realized gain/(loss) on U.S. Treasury securities	(1,735)	11,493
Net unrealized gain/(loss) on U.S. Treasury securities	(526)	(5,491)
Change in fair value of investments in unconsolidated trading companies	16,133	(5,077)
Net gain/(loss) on investments	143,707	559,705
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	88,639	473,709
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	88,639	473,709
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member]
Investment income:
Interest - net
Total Income/(loss)
Expenses:
Service Fees - Class 1	16,157	18,013
Trading Fees	23,676	29,905
Total Expenses	39,833	47,918
Investment income/(loss) - net	(39,833)	(47,918)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	209,744	416,114
Net realized gain/(loss) on private investment companies	6,431	4,371
Net unrealized gain/(loss) on swap contracts		206,847
Net realized gain/(loss) on U.S. Treasury securities	(1,201)	6,794
Net unrealized gain/(loss) on U.S. Treasury securities	(484)	(951)
Change in fair value of investments in unconsolidated trading companies	12,628	(6,103)
Net gain/(loss) on investments	227,118	627,072
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	187,285	579,154
Less: Operations attributable to non-controlling interests		100,287
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 187,285	$ 478,867
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 7.67	$ 16.67
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 2 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	13.7	27.58
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1AP [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 10.24	21.22
The Series of the Frontier Funds [Member] | Frontier Global Fund [Member]
Realized and unrealized gain/(loss) on investments:
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 88,639
The Series of the Frontier Funds [Member] | Frontier Global Fund [Member] | Class 1 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	$ 3.42	14.46
The Series of the Frontier Funds [Member] | Frontier Global Fund [Member] | Class 2 [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT	6.45	22.82
The Series of the Frontier Funds [Member] | Frontier Global Fund [Member] | Class 1AP [Member]
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS PER UNIT		$ 18.66
Frontier Funds [Member]
Investment income:
Interest - net	$ 3,721	$ 7,982
Total Income/(loss)	3,721	7,982
Expenses:
Incentive Fees	49,840
Management Fees	4,619	5,020
Risk analysis Fees	1,386	1,506
Service Fees - Class 1	116,113	202,335
Due Diligence Fees	1,583	4,132
Trading Fees	243,165	443,896
Other Fees	56
Total Expenses	416,762	656,889
Investment income/(loss) - net	(413,041)	(648,907)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options	371,559	642,235
Net unrealized gain/(loss) on private investment companies	1,309,008	792,691
Net realized gain/(loss) on private investment companies	(82,585)	(219,121)
Net change in open trade equity/(deficit)	(47,335)	(25,719)
Net unrealized gain/(loss) on swap contracts		(7,490,918)
Net realized gain/(loss) on U.S. Treasury securities	(9,269)	39,967
Net unrealized gain/(loss) on U.S. Treasury securities	(2,167)	12,311
Trading commissions	(5,961)	(8,375)
Net gain/(loss) on investments	1,533,251	(6,256,929)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS	$ 1,120,210	$ (6,905,836)

Condensed Schedule of Investmen

Condensed Schedule of Investments - USD ($)		Mar. 31, 2021		Dec. 31, 2020
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[1]	$ 3,817,118		$ 3,644,603
Investment Owned, % of Total Capital (Net Asset Value)	[1]	94.72%		87.12%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investment Owned, Fair Value	[1]	$ 1,124,813		$ 1,066,074
Investment Owned, % of Total Capital (Net Asset Value)	[1]	27.91%		25.49%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value	[1]	$ 259,304		$ 414,692
Investment Owned, % of Total Capital (Net Asset Value)	[1]	6.43%		9.91%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investment Owned, Fair Value	[1]	$ 763,095		$ 672,766
Investment Owned, % of Total Capital (Net Asset Value)	[1]	18.94%		16.08%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value		$ 836,526		$ 732,066	[1]
Investment Owned, % of Total Capital (Net Asset Value)		20.76%		17.50%	[1]
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[1]	$ 476,246		$ 435,119
Investment Owned, % of Total Capital (Net Asset Value)	[1]	11.82%		10.40%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]	$ 357,134
Investment Owned, % of Total Capital (Net Asset Value)	[1]	8.86%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]			$ 323,886
Investment Owned, % of Total Capital (Net Asset Value)	[1]			7.74%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[1]	$ 23,731		$ 16,669	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.59%		0.40%	[2]
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[1]	$ 23,731		$ 16,669
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.59%		0.40%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 96,251	[3]	$ 427,509	[4]
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[3]	$ 121,604		$ 427,393
Investment Owned, % of Total Capital (Net Asset Value)	[3]	3.02%		10.22%
Investment Owned, Underlying Face Amount, at Face Value	[3]	$ 510,000		$ 1,755,000
Investment Owned, at Cost		756,828		2,283,228	[3]
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | SHORT FUTURES CONTRACTS [Member]
Investment Owned, Fair Value		$ 117,047
Investment Owned, % of Total Capital (Net Asset Value)		1.07%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[1]	$ 883,076		$ 1,014,591
Investment Owned, % of Total Capital (Net Asset Value)	[1]	88.88%		102.12%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value					[1]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%	[1]
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investment Owned, Fair Value					[1]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%	[1]
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value		$ 380,085		$ 486,659	[1]
Investment Owned, % of Total Capital (Net Asset Value)		38.25%		48.98%	[1]
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[1]	$ 253,710		$ 258,609
Investment Owned, % of Total Capital (Net Asset Value)	[1]	25.53%		26.03%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]	$ 249,281
Investment Owned, % of Total Capital (Net Asset Value)	[1]	25.09%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]			$ 269,323
Investment Owned, % of Total Capital (Net Asset Value)	[1]			27.11%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[1]	$ 13,600		$ 907	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	1.37%		0.09%	[2]
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[1]	$ 13,600		$ 907
Investment Owned, % of Total Capital (Net Asset Value)	[1]	1.37%		0.09%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 55,161	[3]	$ 23,245	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			2.34%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[3]	$ 69,690		$ 23,245
Investment Owned, % of Total Capital (Net Asset Value)	[3]	7.01%		2.34%
Investment Owned, Underlying Face Amount, at Face Value	[3]	$ 510,000		$ 1,755,000
Investment Owned, at Cost	[3]	756,828		2,283,228
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[1]	$ 1,200,790		$ 738,053
Investment Owned, % of Total Capital (Net Asset Value)	[1]	89.64%		56.19%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value					[1]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%	[1]
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investment Owned, Fair Value					[1]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%	[1]
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value					[1]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%	[1]
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[1]	$ 456,484		$ 272,294
Investment Owned, % of Total Capital (Net Asset Value)	[1]	34.08%		20.73%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Investment Owned, Fair Value		$ 247,924
Investment Owned, % of Total Capital (Net Asset Value)		18.51%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investment Owned, Fair Value	[1]	$ 496,382		$ 465,759
Investment Owned, % of Total Capital (Net Asset Value)	[1]	37.05%		35.46%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]			0.00%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[1]	$ 15,597		$ 17,736	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	1.16%		1.35%	[2]
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[1]	$ 15,597		$ 17,736
Investment Owned, % of Total Capital (Net Asset Value)	[1]	1.16%		1.35%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 63,259	[3]	$ 454,738	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			34.63%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[3]	$ 79,922		$ 454,738
Investment Owned, % of Total Capital (Net Asset Value)	[3]	5.97%		34.63%
Investment Owned, Underlying Face Amount, at Face Value	[3]	$ 510,000		$ 1,755,000
Investment Owned, at Cost	[3]	756,828		2,283,228
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value				$ 9,803
Investment Owned, % of Total Capital (Net Asset Value)				0.08%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[1]	$ 10,485,508		$ 10,528,252
Investment Owned, % of Total Capital (Net Asset Value)	[1]	94.03%		86.93%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investment Owned, Fair Value	[1]	$ 2,182,781		$ 2,311,240
Investment Owned, % of Total Capital (Net Asset Value)	[1]	19.57%		19.08%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value	[1]	$ 1,038,047		$ 1,581,941
Investment Owned, % of Total Capital (Net Asset Value)	[1]	9.31%		13.06%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investment Owned, Fair Value	[1]	$ 1,314,523		$ 982,020
Investment Owned, % of Total Capital (Net Asset Value)	[1]	11.79%		8.11%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value	[1]	$ 1,584,459		$ 1,600,611
Investment Owned, % of Total Capital (Net Asset Value)	[1]	14.21%		13.22%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[1]	$ 2,829,148		$ 2,612,336
Investment Owned, % of Total Capital (Net Asset Value)	[1]	25.37%		21.57%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]	$ 1,536,550
Investment Owned, % of Total Capital (Net Asset Value)	[1]	13.78%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Investment Owned, Fair Value	[1]	$ 668,428
Investment Owned, % of Total Capital (Net Asset Value)	[1]	2.97%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Investment Owned, Fair Value	[1]	$ 1,913,873
Investment Owned, % of Total Capital (Net Asset Value)	[1]	8.51%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]			$ 1,440,104
Investment Owned, % of Total Capital (Net Asset Value)	[1]			11.89%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[1]	$ 9,590		$ 49,755
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.59%		0.41%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[1]	$ 33,854		$ 49,755
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.30%		0.41%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value	[3]	$ 137,308		$ 17,266,387
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[3]	$ 173,475		$ 1,275,641
Investment Owned, % of Total Capital (Net Asset Value)	[3]	1.56%		10.53%
Investment Owned, Underlying Face Amount, at Face Value	[3]	$ 596,500		$ 980,787
Investment Owned, at Cost	[3]	756,828
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, at Cost		174,214
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, at Cost	[3]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member]
Investment Owned, Fair Value	[4]	$ 449,023		$ 449,023
Investment Owned, % of Total Capital (Net Asset Value)	[4]	3.70%		3.70%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ 1,068		$ 72,005	[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.01%		0.28%	[4]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ 2,468		$ 9,803	[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.02%		0.08%	[4]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]	$ 75,491		$ 87,496
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.68%		0.72%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (25,796)
Investment Owned, % of Total Capital (Net Asset Value)		(0.23%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ (7,381)
Investment Owned, % of Total Capital (Net Asset Value)		(0.07%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various currency futures contracts (Far East) [Member]
Investment Owned, Fair Value		$ 4,564
Investment Owned, % of Total Capital (Net Asset Value)		0.04%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value		$ 744		$ 5,833	[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.01%		0.05%	[4]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (8,850)
Investment Owned, % of Total Capital (Net Asset Value)		(0.08%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 6,740
Investment Owned, % of Total Capital (Net Asset Value)	[5]	(0.06%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]	$ (166,167)		$ 148,949
Investment Owned, % of Total Capital (Net Asset Value)	[4]	(1.49%)		1.23%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ (1,298)		$ 2,882	[4]
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)		0.02%	[4]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]			$ (1,563)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			(0.01%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]	$ 21,705
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.19%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]	$ 19,624
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.18%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Africa) [Member]
Investment Owned, Fair Value		$ 117
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value	[5]	$ 10,124
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.09%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Far East) [Member]
Investment Owned, Fair Value		$ 3,993		$ 5,312	[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.04%		0.04%	[4]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Oceanic) [Member]
Investment Owned, Fair Value	[5]	$ 393
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 1,354
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.01%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Canada) [Member]
Investment Owned, Fair Value		$ (1,270)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]			$ 22,858
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.19%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]			$ 10,573
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.09%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]			$ (100)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]			$ 28,625
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.24%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various soft futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]			$ 52,349
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.43%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | CURRENCY FORWARDS [Member]
Investment Owned, Fair Value	[4]	$ 59,127
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.26%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | CURRENCY FORWARDS [Member] | Various Currency Forwards Contracts (NA) [Member]
Investment Owned, Fair Value	[4]	$ 59,127
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.26%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Open Trade Equity (Deficit) [Member]
Investment Owned, Fair Value	[4]	$ 116,184		$ 100,440
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.52%		0.81%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[6]	$ 11,944,753
Investment Owned, % of Total Capital (Net Asset Value)	[6]	53.10%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Swap [Member] | Frontier XXXIV Balanced Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[6]	$ 11,944,753
Investment Owned, % of Total Capital (Net Asset Value)	[6]	53.10%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member]
Investment Owned, Fair Value	[4]			$ (348,583)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			(2.89%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ 1,299
Investment Owned, % of Total Capital (Net Asset Value)		0.01%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ 2,952
Investment Owned, % of Total Capital (Net Asset Value)		0.03%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (49,181)
Investment Owned, % of Total Capital (Net Asset Value)		(0.44%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]	$ (1,547)
Investment Owned, % of Total Capital (Net Asset Value)	[4]	(0.01%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]	$ 16,450
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.15%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Far East) [Member]
Investment Owned, Fair Value		$ (524)
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value		$ 4,736
Investment Owned, % of Total Capital (Net Asset Value)		0.04%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ 3,488
Investment Owned, % of Total Capital (Net Asset Value)		0.03%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value		$ 9,860
Investment Owned, % of Total Capital (Net Asset Value)		0.09%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ 100,326	[5]	$ (127,832)	[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.90%	[5]	(1.06%)	[4]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ 9,758
Investment Owned, % of Total Capital (Net Asset Value)		0.09%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value				$ 21,563
Investment Owned, % of Total Capital (Net Asset Value)				0.19%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value		$ 5,550		$ (25,560)	[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.05%		(0.21%)	[4]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]	$ (2,431)		$ (42,669)
Investment Owned, % of Total Capital (Net Asset Value)	[4]	(0.02%)		(0.35%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Africa) [Member]
Investment Owned, Fair Value		$ 890
Investment Owned, % of Total Capital (Net Asset Value)		0.01%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value		$ (414)
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Far East) [Member]
Investment Owned, Fair Value		$ 449
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (1,444)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Canada) [Member]
Investment Owned, Fair Value		$ (4,733)
Investment Owned, % of Total Capital (Net Asset Value)		(0.04%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[4]			$ (3,340)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			(0.03%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various agriculture futures contracts (Far East) One [Member]
Investment Owned, Fair Value	[4]			$ (30,963)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			(0.26%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) One [Member]
Investment Owned, Fair Value	[4]			$ (92,738)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			(0.77%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various base metals futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[4]			$ (10,289)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			(0.08%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Europe) One [Member]
Investment Owned, Fair Value	[4]			$ (10,381)
Investment Owned, % of Total Capital (Net Asset Value)	[4]			(0.09%)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Latin America) One [Member]
Investment Owned, Fair Value	[4]			$ 2,512
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.02%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Energy Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value				$ 2,300
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.02%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various interest rates futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[4]			$ 3,656
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.03%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[1]	$ 1,520,376		$ 1,638,665
Investment Owned, % of Total Capital (Net Asset Value)	[1]	93.29%		99.13%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[1]	$ 862,314		$ 956,968
Investment Owned, % of Total Capital (Net Asset Value)	[1]	52.91%		57.89%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]	$ 658,062
Investment Owned, % of Total Capital (Net Asset Value)	[1]	40.38%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[1]	$ 9,590
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.59%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[1]	$ 33,854
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.30%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value	[3]	$ 38,896		$ 2,593,522
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[3]	$ 49,141
Investment Owned, % of Total Capital (Net Asset Value)	[3]	3.02%		0.00%
Investment Owned, Underlying Face Amount, at Face Value	[3]	$ 596,500
Investment Owned, at Cost	[3]	756,828
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, at Cost		49,351		6,686	[3]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Far East) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value					[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%	[4]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various currency futures contracts (Far East) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)				0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Africa) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value	[5]
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Far East) [Member]
Investment Owned, Fair Value					[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%		0.00%	[4]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Oceanic) [Member]
Investment Owned, Fair Value	[5]
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Canada) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | CURRENCY FORWARDS [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | CURRENCY FORWARDS [Member] | Various Currency Forwards Contracts (NA) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Open Trade Equity (Deficit) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Swap [Member] | Frontier XXXIV Balanced Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Far East) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Far East) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value			[5]		[4]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%	[5]	0.00%	[4]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)				0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Africa) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Far East) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (U.S.) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Canada) [Member]
Investment Owned, Fair Value
Investment Owned, % of Total Capital (Net Asset Value)		0.00%
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[1]	$ 2,799,957		$ 3,068,656
Investment Owned, % of Total Capital (Net Asset Value)	[1]	97.29%		104.71%
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value	[1]	$ 2,799,957		$ 3,068,656
Investment Owned, % of Total Capital (Net Asset Value)	[1]	97.29%		104.71%
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[1]	$ 27,774		$ 1,083
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.97%		0.04%
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[1]	$ 27,774		$ 1,083
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.97%		0.04%
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 112,646	[3]	$ 56,778
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[3]	$ 142,316		$ 27,742
Investment Owned, % of Total Capital (Net Asset Value)	[3]	4.95%		0.95%
Investment Owned, Underlying Face Amount, at Face Value	[3]	$ 596,500		$ 1,755,000
Investment Owned, at Cost	[3]	756,828		2,283,228
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, at Cost		142,923		27,750
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[1]	$ 2,332,982		$ 2,367,462
Investment Owned, % of Total Capital (Net Asset Value)	[1]	94.70%		99.25%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value	[1]	$ 1,520,090		$ 1,539,331
Investment Owned, % of Total Capital (Net Asset Value)	[1]	61.71%		64.53%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[1]	$ 812,892		$ 828,131
Investment Owned, % of Total Capital (Net Asset Value)	[1]	33.00%		34.72%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[1]	$ 22,925		$ 2,880
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.93%		0.12%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[1]	$ 22,925		$ 2,880
Investment Owned, % of Total Capital (Net Asset Value)	[1]	0.93%		0.12%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 92,979	[3]	$ 21,330
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[3]	$ 117,469		$ 73,847
Investment Owned, % of Total Capital (Net Asset Value)	[3]	4.77%		3.10%
Investment Owned, Underlying Face Amount, at Face Value	[3]	$ 596,500		$ 1,755,000
Investment Owned, at Cost	[3]	756,828		2,283,228
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, at Cost		117,970		73,867
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[1]			$ 681,697
Investment Owned, % of Total Capital (Net Asset Value)	[1]			41.24%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various soft futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various agriculture futures contracts (Far East) One [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) One [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various base metals futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Europe) One [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Latin America) One [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) One [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various interest rates futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[4]
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.00%
Frontier Funds [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[7]	$ 23,186,879		$ 23,089,312
Investment Owned, % of Total Capital (Net Asset Value)	[7]	94.70%		90.31%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investment Owned, Fair Value	[7]	$ 3,307,594		$ 3,377,314
Investment Owned, % of Total Capital (Net Asset Value)	[7]	13.51%		13.21%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value	[7]	$ 1,297,351
Investment Owned, % of Total Capital (Net Asset Value)	[7]	5.30%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investment Owned, Fair Value	[7]	$ 2,077,618		$ 1,654,786
Investment Owned, % of Total Capital (Net Asset Value)	[7]	8.49%		6.47%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value	[7]	$ 7,121,118		$ 7,427,324
Investment Owned, % of Total Capital (Net Asset Value)	[7]	29.08%		29.05%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[7]	$ 5,690,794		$ 5,363,456
Investment Owned, % of Total Capital (Net Asset Value)	[7]	23.24%		20.98%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[7]	$ 2,801,027
Investment Owned, % of Total Capital (Net Asset Value)	[7]	11.44%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Investment Owned, Fair Value	[7]	$ 247,924		$ 89,029
Investment Owned, % of Total Capital (Net Asset Value)	[7]	1.01%		0.35%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investment Owned, Fair Value	[7]	$ 496,382		$ 465,759
Investment Owned, % of Total Capital (Net Asset Value)	[7]	2.03%		1.82%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[7]			$ 2,715,008
Investment Owned, % of Total Capital (Net Asset Value)	[7]			10.62%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value	[7]			$ 1,996,633
Investment Owned, % of Total Capital (Net Asset Value)	[7]			7.81%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Fit Feeder Fund (535) LLC [Member]
Investment Owned, Fair Value	[7]	$ 147,071
Investment Owned, % of Total Capital (Net Asset Value)	[7]	0.60%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member]
Investment Owned, Fair Value		$ (63,940)	[5]	$ 449,023	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.28%)	[5]	1.74%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ 1,068	[5]	$ 72,005	[8]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%	[5]	0.28%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[5]	$ 2,468		$ 9,803
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.01%		0.04%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ 75,491	[5]	$ 87,496	[8]
Investment Owned, % of Total Capital (Net Asset Value)		0.31%	[5]	0.34%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various currency futures contracts (Far East) [Member]
Investment Owned, Fair Value	[5]	$ 4,564
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.02%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value		$ 744	[5]	$ 5,833	[8]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%	[5]	0.02%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 6,740
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.03%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ (166,167)	[5]	$ 148,949	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.68%)	[5]	0.58%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ (1,298)	[5]	$ 2,882	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)	[5]	0.01%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (1,563)	[5]	$ 2,438	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)	[5]	0.01%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 21,705
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.09%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 19,624
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.08%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Africa) [Member]
Investment Owned, Fair Value	[5]	$ 117
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value	[5]	$ 10,124
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.04%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Oceanic) [Member]
Investment Owned, Fair Value	[5]	$ 393
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (25,796)	[5]	$ 22,858	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.11%)	[5]	0.09%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ (7,381)	[5]	$ 10,573	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.03%)	[5]	0.04%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (8,850)	[5]	$ (100)	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.04%)	[5]	0.00%	[8]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[5]	$ 3,993		$ 5,312
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.02%		0.02%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[8]			$ 28,625
Investment Owned, % of Total Capital (Net Asset Value)	[8]			0.11%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various soft futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[8]			$ 52,349
Investment Owned, % of Total Capital (Net Asset Value)	[8]			0.20%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 1,354
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.01%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Canada) [Member]
Investment Owned, Fair Value	[5]	$ (1,270)
Investment Owned, % of Total Capital (Net Asset Value)	[5]	(0.01%)
Frontier Funds [Member] | CURRENCY FORWARDS [Member] | Open Trade Equity (Deficit) [Member]
Investment Owned, Fair Value		$ 53,107	[5]	$ 100,440	[8]
Investment Owned, % of Total Capital (Net Asset Value)		0.19%	[5]	0.38%	[8]
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member]
Investment Owned, Fair Value		$ 117,047	[5]	$ (348,583)	[8]
Investment Owned, % of Total Capital (Net Asset Value)		0.47%	[5]	(1.36%)	[8]
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[5]	$ 1,299
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.01%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (49,181)	[5]	$ (92,738)	[8]
Investment Owned, % of Total Capital (Net Asset Value)		(0.20%)	[5]	(0.36%)	[8]
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ 2,952	[5]	$ (10,797)
Investment Owned, % of Total Capital (Net Asset Value)		0.01%	[5]	(0.04%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Far East) [Member]
Investment Owned, Fair Value	[5]	$ (524)
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value	[5]	$ 4,736
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.02%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ 3,488	[5]	$ 2,300	[8]
Investment Owned, % of Total Capital (Net Asset Value)		0.01%	[5]	0.01%	[8]
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 9,860
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.04%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[5]	$ 100,326
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.41%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[5]	$ 9,758
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.04%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 21,563
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.09%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ 5,550
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.02%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ (2,431)
Investment Owned, % of Total Capital (Net Asset Value)	[5]	(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Africa) [Member]
Investment Owned, Fair Value	[5]	$ 890
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value	[5]	$ 449
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[5]	$ (1,547)
Investment Owned, % of Total Capital (Net Asset Value)	[5]	(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ 16,450	[5]	$ (10,381)
Investment Owned, % of Total Capital (Net Asset Value)		0.07%	[5]	(0.04%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ (1,444)	[5]	$ (3,340)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)	[5]	(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various agriculture futures contracts (Far East) One [Member]
Investment Owned, Fair Value	[8]			$ 30,963
Investment Owned, % of Total Capital (Net Asset Value)	[8]			(0.12%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various base metals futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[8]			$ (10,289)
Investment Owned, % of Total Capital (Net Asset Value)	[8]			(0.04%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Latin America) One [Member]
Investment Owned, Fair Value	[8]			$ 2,512
Investment Owned, % of Total Capital (Net Asset Value)	[8]			0.01%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) One [Member]
Investment Owned, Fair Value	[8]			$ (2,482)
Investment Owned, % of Total Capital (Net Asset Value)	[8]			(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various interest rates futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[8]			$ 3,656
Investment Owned, % of Total Capital (Net Asset Value)	[8]			0.01%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various interest rates futures contracts (Europe) One [Member]
Investment Owned, Fair Value	[8]			$ (127,832)
Investment Owned, % of Total Capital (Net Asset Value)	[8]			(0.50%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[8]			$ (25,560)
Investment Owned, % of Total Capital (Net Asset Value)	[8]			(0.10%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various soft futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[8]			$ (42,669)
Investment Owned, % of Total Capital (Net Asset Value)	[8]			(0.17%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (4,733)
Investment Owned, % of Total Capital (Net Asset Value)		(0.02%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Canada) [Member]
Investment Owned, Fair Value	[5]	$ (414)
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%
Frontier Funds [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 753,617		$ 2,282,606
Investment Owned, % of Total Capital (Net Asset Value)		3.08%		8.93%
Frontier Funds [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value		$ 753,617		$ 2,282,606
Investment Owned, % of Total Capital (Net Asset Value)		3.08%		8.93%
Investment Owned, Underlying Face Amount, at Face Value		$ 596,500		$ 1,755,000
Investment Owned, at Cost		$ 756,828		$ 2,283,228
[1]	See Note 5 to the Financial Statements.
[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]	See Note 2 to the Financial Statements.
[4]	Except for those items disclosed, no individual futures, or forwards position constituted greater than 1 percent of Net Asset Value. Accordingly, the number of contracts and expiration dates are not presented.
[5]	Except for those items disclosed, no individual futures, forwards and option on futures contract position constituted greater than 1 percent of Net Asset Value. Accordingly, the number of contracts and expiration dates are not presented.
[6]	See Note 4 to the Financial Statements.
[7]	See Notes to Consolidated Financial Statements, Note 5.
[8]	Except for those items disclosed, no individual futures, forwards and option on futures contract position constituted greater than 1 percent of Net Asset Value. Accordingly, the number of contracts and expiration dates are not presented.

Statements of Changes in Owners

Statements of Changes in Owners’ Capital (Unaudited)	3 Months Ended
	Mar. 31, 2021USD ($)$ / sharesshares
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Limited Owners [Member] | Class 1 [Member]
Owners' Capital, Beginning balance	$ 154,260
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	4,106
Owners' Capital, Ending balance	$ 158,366
Owners’ Capital - Units, Beginning balance | shares	2,122
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	2,122
Net asset value per unit, Beginning balance | $ / shares	$ 72.68
Change in net asset value per unit | $ / shares	1.94
Net asset value per unit, Ending balance | $ / shares	$ 74.62
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Limited Owners [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 464,012
Sale of Units (including transfers)
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	11,574
Owners' Capital, Ending balance	$ 409,718
Owners’ Capital - Units, Beginning balance | shares	5,217
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(750)
Owners’ Capital - Units, Ending balance | shares	4,467
Net asset value per unit, Beginning balance | $ / shares	$ 88.95
Change in net asset value per unit | $ / shares	2.76
Net asset value per unit, Ending balance | $ / shares	$ 91.71
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Limited Owners [Member] | Class 3 [Member]
Owners' Capital, Beginning balance	$ 3,508,082
Sale of Units (including transfers)
Redemption of Units (including transfers)	(192,581)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	103,418
Owners' Capital, Ending balance	$ 3,418,919
Owners’ Capital - Units, Beginning balance | shares	42,100
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(2,330)
Owners’ Capital - Units, Ending balance | shares	39,770
Net asset value per unit, Beginning balance | $ / shares	$ 83.33
Change in net asset value per unit | $ / shares	2.64
Net asset value per unit, Ending balance | $ / shares	$ 85.97
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Managing Owner [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 2,212
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	68
Owners' Capital, Ending balance	$ 2,280
Owners’ Capital - Units, Beginning balance | shares	25
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	25
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Managing Owner [Member] | Class 3 [Member]
Owners' Capital, Beginning balance	$ 54,405
Sale of Units (including transfers)
Redemption of Units (including transfers)	(15,000)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,032
Owners' Capital, Ending balance	$ 40,437
Owners’ Capital - Units, Beginning balance | shares	653
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(182)
Owners’ Capital - Units, Ending balance | shares	471
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Non-Controlling Interests [Member]
Owners' Capital, Beginning balance
Sale of Units (including transfers)
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
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 1 [Member]
Owners’ Capital - Units, Beginning balance | shares	2,122
Owners’ Capital - Units, Ending balance | shares	2,122
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 2 [Member]
Owners’ Capital - Units, Beginning balance | shares	5,241
Owners’ Capital - Units, Ending balance | shares	4,492
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 3 [Member]
Owners’ Capital - Units, Beginning balance | shares	42,754
Owners’ Capital - Units, Ending balance | shares	40,241
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member]
Owners' Capital, Beginning balance	$ 4,182,971
Sale of Units (including transfers)
Redemption of Units (including transfers)	(273,449)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	120,198
Owners' Capital, Ending balance	4,029,720
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Limited Owners [Member] | Class 1 [Member]
Owners' Capital, Beginning balance	9,740
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	399
Owners' Capital, Ending balance	$ 10,139
Owners’ Capital - Units, Beginning balance | shares	177
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	177
Net asset value per unit, Beginning balance | $ / shares	$ 55.18
Change in net asset value per unit | $ / shares	2.26
Net asset value per unit, Ending balance | $ / shares	$ 57.44
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Limited Owners [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 257,673
Sale of Units (including transfers)
Redemption of Units (including transfers)	(7,344)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	11,508
Owners' Capital, Ending balance	$ 261,837
Owners’ Capital - Units, Beginning balance | shares	3,816
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(108)
Owners’ Capital - Units, Ending balance | shares	3,708
Net asset value per unit, Beginning balance | $ / shares	$ 67.54
Change in net asset value per unit | $ / shares	3.07
Net asset value per unit, Ending balance | $ / shares	$ 70.61
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Limited Owners [Member] | Class 3 [Member]
Owners' Capital, Beginning balance	$ 712,682
Sale of Units (including transfers)
Redemption of Units (including transfers)	(33,100)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	31,724
Owners' Capital, Ending balance	$ 711,306
Owners’ Capital - Units, Beginning balance | shares	11,220
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(515)
Owners’ Capital - Units, Ending balance | shares	10,705
Net asset value per unit, Beginning balance | $ / shares	$ 63.52
Change in net asset value per unit | $ / shares	2.93
Net asset value per unit, Ending balance | $ / shares	$ 66.45
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Managing Owner [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 6,265
Sale of Units (including transfers)
Redemption of Units (including transfers)	(3,500)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	61
Owners' Capital, Ending balance	$ 2,826
Owners’ Capital - Units, Beginning balance | shares	93
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(53)
Owners’ Capital - Units, Ending balance | shares	40
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Managing Owner [Member] | Class 3 [Member]
Owners' Capital, Beginning balance	$ 7,167
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	331
Owners' Capital, Ending balance	$ 7,498
Owners’ Capital - Units, Beginning balance | shares	113
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	113
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Non-Controlling Interests [Member]
Owners' Capital, Beginning balance
Sale of Units (including transfers)
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
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 1 [Member]
Owners’ Capital - Units, Beginning balance | shares	177
Owners’ Capital - Units, Ending balance | shares	177
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 2 [Member]
Owners’ Capital - Units, Beginning balance | shares	3,908
Owners’ Capital - Units, Ending balance | shares	3,748
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 3 [Member]
Owners’ Capital - Units, Beginning balance | shares	11,333
Owners’ Capital - Units, Ending balance | shares	10,818
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member]
Owners' Capital, Beginning balance	$ 993,527
Sale of Units (including transfers)
Redemption of Units (including transfers)	(43,944)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	44,023
Owners' Capital, Ending balance	993,606
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	30,334
Sale of Units (including transfers)
Redemption of Units (including transfers)	(423)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,536
Owners' Capital, Ending balance	$ 31,447
Owners’ Capital - Units, Beginning balance | shares	353
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(5)
Owners’ Capital - Units, Ending balance | shares	348
Net asset value per unit, Beginning balance | $ / shares	$ 85.99
Change in net asset value per unit | $ / shares	4.40
Net asset value per unit, Ending balance | $ / shares	$ 90.39
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | Class 3 [Member]
Owners' Capital, Beginning balance	$ 976,771
Sale of Units (including transfers)
Redemption of Units (including transfers)	(18,296)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	49,566
Owners' Capital, Ending balance	$ 1,008,041
Owners’ Capital - Units, Beginning balance | shares	10,828
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(197)
Owners’ Capital - Units, Ending balance | shares	10,631
Net asset value per unit, Beginning balance | $ / shares	$ 90.21
Change in net asset value per unit | $ / shares	4.61
Net asset value per unit, Ending balance | $ / shares	$ 94.82
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | Class 2a [Member]
Owners' Capital, Beginning balance	$ 76,583
Sale of Units (including transfers)
Redemption of Units (including transfers)	(4,963)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	4,286
Owners' Capital, Ending balance	$ 75,906
Owners’ Capital - Units, Beginning balance | shares	1,386
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(87)
Owners’ Capital - Units, Ending balance | shares	1,299
Net asset value per unit, Beginning balance | $ / shares	$ 55.29
Change in net asset value per unit | $ / shares	3.20
Net asset value per unit, Ending balance | $ / shares	$ 58.49
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Limited Owners [Member] | Class 3a [Member]
Owners' Capital, Beginning balance	$ 216,354
Sale of Units (including transfers)
Redemption of Units (including transfers)	(18,086)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	11,975
Owners' Capital, Ending balance	$ 210,243
Owners’ Capital - Units, Beginning balance | shares	3,707
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(303)
Owners’ Capital - Units, Ending balance | shares	3,404
Net asset value per unit, Beginning balance | $ / shares	$ 58.37
Change in net asset value per unit | $ / shares	3.40
Net asset value per unit, Ending balance | $ / shares	$ 61.77
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 3,939
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	201
Owners' Capital, Ending balance	$ 4,140
Owners’ Capital - Units, Beginning balance | shares	46
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	46
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member] | Class 2a [Member]
Owners' Capital, Beginning balance	$ 8,274
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	477
Owners' Capital, Ending balance	$ 8,751
Owners’ Capital - Units, Beginning balance | shares	149
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	149
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Managing Owner [Member] | Class 3a [Member]
Owners' Capital, Beginning balance	$ 1,048
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	61
Owners' Capital, Ending balance	$ 1,109
Owners’ Capital - Units, Beginning balance | shares	18
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	18
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Non-Controlling Interests [Member]
Owners' Capital, Beginning balance
Sale of Units (including transfers)
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
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 1 [Member]
Owners’ Capital - Units, Beginning balance | shares
Owners’ Capital - Units, Ending balance | shares
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
Owners’ Capital - Units, Beginning balance | shares	399
Owners’ Capital - Units, Ending balance | shares	394
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
Owners’ Capital - Units, Beginning balance | shares	10,828
Owners’ Capital - Units, Ending balance | shares	10,631
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
Owners' Capital, Beginning balance	$ 1,313,303
Sale of Units (including transfers)
Redemption of Units (including transfers)	(41,768)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	68,102
Owners' Capital, Ending balance	1,339,637
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | Class 1 [Member]
Owners' Capital, Beginning balance	9,430,532
Sale of Units (including transfers)
Redemption of Units (including transfers)	(1,073,816)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	380,376
Owners' Capital, Ending balance	$ 8,737,092
Owners’ Capital - Units, Beginning balance | shares	117,991
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(13,213)
Owners’ Capital - Units, Ending balance | shares	104,778
Net asset value per unit, Beginning balance | $ / shares	$ 79.93
Change in net asset value per unit | $ / shares	3.46
Net asset value per unit, Ending balance | $ / shares	$ 83.39
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 1,906,359
Sale of Units (including transfers)
Redemption of Units (including transfers)	(351,644)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	85,069
Owners' Capital, Ending balance	$ 1,639,784
Owners’ Capital - Units, Beginning balance | shares	14,603
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(2,652)
Owners’ Capital - Units, Ending balance | shares	11,951
Net asset value per unit, Beginning balance | $ / shares	$ 130.54
Change in net asset value per unit | $ / shares	6.67
Net asset value per unit, Ending balance | $ / shares	$ 137.21
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | Class 2a [Member]
Owners' Capital, Beginning balance	$ 30,961
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,582
Owners' Capital, Ending balance	$ 32,543
Owners’ Capital - Units, Beginning balance | shares	274
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	274
Net asset value per unit, Beginning balance | $ / shares	$ 113.20
Change in net asset value per unit | $ / shares	5.78
Net asset value per unit, Ending balance | $ / shares	$ 118.98
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | Class 3a [Member]
Owners' Capital, Beginning balance	$ 507,148
Sale of Units (including transfers)
Redemption of Units (including transfers)	(28,339)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	24,481
Owners' Capital, Ending balance	$ 503,290
Owners’ Capital - Units, Beginning balance | shares	4,495
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(251)
Owners’ Capital - Units, Ending balance | shares	4,244
Net asset value per unit, Beginning balance | $ / shares	$ 112.81
Change in net asset value per unit | $ / shares	5.77
Net asset value per unit, Ending balance | $ / shares	$ 118.58
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Limited Owners [Member] | Class 1AP [Member]
Owners' Capital, Beginning balance	$ 108,053
Sale of Units (including transfers)
Redemption of Units (including transfers)	(966)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	5,484
Owners' Capital, Ending balance	$ 112,571
Owners’ Capital - Units, Beginning balance | shares	1,116
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(10)
Owners’ Capital - Units, Ending balance | shares	1,106
Net asset value per unit, Beginning balance | $ / shares	$ 96.81
Change in net asset value per unit | $ / shares	4.94
Net asset value per unit, Ending balance | $ / shares	$ 101.75
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 51,810
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	2,645
Owners' Capital, Ending balance	$ 54,455
Owners’ Capital - Units, Beginning balance | shares	397
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	397
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Managing Owner [Member] | Class 2a [Member]
Owners' Capital, Beginning balance	$ 75,416
Sale of Units (including transfers)
Redemption of Units (including transfers)	(7,000)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	3,333
Owners' Capital, Ending balance	$ 71,749
Owners’ Capital - Units, Beginning balance | shares	666
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(63)
Owners’ Capital - Units, Ending balance | shares	603
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Non-Controlling Interests [Member]
Owners' Capital, Beginning balance
Sale of Units (including transfers)
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
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1 [Member]
Owners’ Capital - Units, Beginning balance | shares	117,991
Owners’ Capital - Units, Ending balance | shares	104,778
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 2 [Member]
Owners’ Capital - Units, Beginning balance | shares	15,000
Owners’ Capital - Units, Ending balance | shares	12,348
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1AP [Member]
Owners’ Capital - Units, Beginning balance | shares	1,116
Owners’ Capital - Units, Ending balance | shares	1,106
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member]
Owners' Capital, Beginning balance	$ 12,110,279
Sale of Units (including transfers)
Redemption of Units (including transfers)	(1,461,765)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	502,970
Owners' Capital, Ending balance	11,151,484
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Limited Owners [Member] | Class 1 [Member]
Owners' Capital, Beginning balance	1,575,328
Sale of Units (including transfers)
Redemption of Units (including transfers)	(130,530)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	103,171
Owners' Capital, Ending balance	$ 1,547,969
Owners’ Capital - Units, Beginning balance | shares	26,906
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(2,161)
Owners’ Capital - Units, Ending balance | shares	24,745
Net asset value per unit, Beginning balance | $ / shares	$ 58.55
Change in net asset value per unit | $ / shares	4.01
Net asset value per unit, Ending balance | $ / shares	$ 62.56
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Limited Owners [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 50,769
Sale of Units (including transfers)
Redemption of Units (including transfers)	(482)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	3,847
Owners' Capital, Ending balance	$ 54,134
Owners’ Capital - Units, Beginning balance | shares	539
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(5)
Owners’ Capital - Units, Ending balance | shares	534
Net asset value per unit, Beginning balance | $ / shares	$ 94.20
Change in net asset value per unit | $ / shares	7.20
Net asset value per unit, Ending balance | $ / shares	$ 101.40
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Limited Owners [Member] | Class 1AP [Member]
Owners' Capital, Beginning balance	$ 9,821
Sale of Units (including transfers)
Redemption of Units (including transfers)	(656)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	732
Owners' Capital, Ending balance	$ 9,897
Owners’ Capital - Units, Beginning balance | shares	138
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(8)
Owners’ Capital - Units, Ending balance | shares	130
Net asset value per unit, Beginning balance | $ / shares	$ 70.99
Change in net asset value per unit | $ / shares	5.42
Net asset value per unit, Ending balance | $ / shares	$ 76.41
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Managing Owner [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 17,210
Sale of Units (including transfers)
Redemption of Units (including transfers)	(800)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,243
Owners' Capital, Ending balance	$ 17,653
Owners’ Capital - Units, Beginning balance | shares	183
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(9)
Owners’ Capital - Units, Ending balance | shares	174
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Non-Controlling Interests [Member]
Owners' Capital, Beginning balance
Sale of Units (including transfers)
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
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1 [Member]
Owners’ Capital - Units, Beginning balance | shares	26,906
Owners’ Capital - Units, Ending balance | shares	24,745
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Class 2 [Member]
Owners’ Capital - Units, Beginning balance | shares	722
Owners’ Capital - Units, Ending balance | shares	708
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1AP [Member]
Owners’ Capital - Units, Beginning balance | shares	138
Owners’ Capital - Units, Ending balance | shares	130
The Series of Frontier Funds [Member] | Frontier Select Fund [Member]
Owners' Capital, Beginning balance	$ 1,653,128
Sale of Units (including transfers)
Redemption of Units (including transfers)	(132,468)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	108,993
Owners' Capital, Ending balance	1,629,653
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Limited Owners [Member] | Class 1 [Member]
Owners' Capital, Beginning balance	2,741,972
Sale of Units (including transfers)
Redemption of Units (including transfers)	(139,476)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	81,445
Owners' Capital, Ending balance	$ 2,683,941
Owners’ Capital - Units, Beginning balance | shares	24,724
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(1,247)
Owners’ Capital - Units, Ending balance | shares	23,477
Net asset value per unit, Beginning balance | $ / shares	$ 110.90
Change in net asset value per unit | $ / shares	3.42
Net asset value per unit, Ending balance | $ / shares	$ 114.32
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Limited Owners [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 157,311
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	6,062
Owners' Capital, Ending balance	$ 163,373
Owners’ Capital - Units, Beginning balance | shares	939
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	939
Net asset value per unit, Beginning balance | $ / shares	$ 167.56
Change in net asset value per unit | $ / shares	6.45
Net asset value per unit, Ending balance | $ / shares	$ 174.01
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Managing Owner [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 31,366
Sale of Units (including transfers)
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	1,132
Owners' Capital, Ending balance	$ 30,498
Owners’ Capital - Units, Beginning balance | shares	187
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(12)
Owners’ Capital - Units, Ending balance | shares	175
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Non-Controlling Interests [Member]
Owners' Capital, Beginning balance
Sale of Units (including transfers)
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
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Class 1 [Member]
Owners’ Capital - Units, Beginning balance | shares	24,725
Owners’ Capital - Units, Ending balance | shares	23,477
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Class 2 [Member]
Owners’ Capital - Units, Beginning balance | shares	1,126
Owners’ Capital - Units, Ending balance | shares	1,114
The Series of Frontier Funds [Member] | Frontier Global Fund [Member] | Class 1AP [Member]
Owners’ Capital - Units, Beginning balance | shares
Owners’ Capital - Units, Ending balance | shares
The Series of Frontier Funds [Member] | Frontier Global Fund [Member]
Owners' Capital, Beginning balance	$ 2,930,649
Sale of Units (including transfers)
Redemption of Units (including transfers)	(141,476)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	88,639
Owners' Capital, Ending balance	2,877,812
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Limited Owners [Member] | Class 1 [Member]
Owners' Capital, Beginning balance	2,169,152
Sale of Units (including transfers)
Redemption of Units (including transfers)	(108,298)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	168,312
Owners' Capital, Ending balance	$ 2,229,166
Owners’ Capital - Units, Beginning balance | shares	22,572
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(1,091)
Owners’ Capital - Units, Ending balance | shares	21,481
Net asset value per unit, Beginning balance | $ / shares	$ 96.10
Change in net asset value per unit | $ / shares	7.67
Net asset value per unit, Ending balance | $ / shares	$ 103.77
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Limited Owners [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 183,565
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	16,131
Owners' Capital, Ending balance	$ 199,696
Owners’ Capital - Units, Beginning balance | shares	1,177
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	1,177
Net asset value per unit, Beginning balance | $ / shares	$ 155.92
Change in net asset value per unit | $ / shares	13.70
Net asset value per unit, Ending balance | $ / shares	$ 169.62
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Limited Owners [Member] | Class 1AP [Member]
Owners' Capital, Beginning balance	$ 8,460
Sale of Units (including transfers)
Redemption of Units (including transfers)	(1,099)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	724
Owners' Capital, Ending balance	$ 8,085
Owners’ Capital - Units, Beginning balance | shares	73
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares	(9)
Owners’ Capital - Units, Ending balance | shares	64
Net asset value per unit, Beginning balance | $ / shares	$ 116.50
Change in net asset value per unit | $ / shares	10.24
Net asset value per unit, Ending balance | $ / shares	$ 126.74
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Managing Owner [Member] | Class 2 [Member]
Owners' Capital, Beginning balance	$ 24,105
Sale of Units (including transfers)
Redemption of Units (including transfers)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	2,118
Owners' Capital, Ending balance	$ 26,223
Owners’ Capital - Units, Beginning balance | shares	155
Owners’ Capital - Units, Sale of Units (including transfers) | shares
Owners’ Capital - Units, Redemption of Units (including transfers) | shares
Owners’ Capital - Units, Ending balance | shares	155
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Non-Controlling Interests [Member]
Owners' Capital, Beginning balance
Sale of Units (including transfers)
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
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1 [Member]
Owners’ Capital - Units, Beginning balance | shares	22,572
Owners’ Capital - Units, Ending balance | shares	21,481
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 2 [Member]
Owners’ Capital - Units, Beginning balance | shares	1,332
Owners’ Capital - Units, Ending balance | shares	1,332
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1AP [Member]
Owners’ Capital - Units, Beginning balance | shares	73
Owners’ Capital - Units, Ending balance | shares	64
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member]
Owners' Capital, Beginning balance	$ 2,385,282
Sale of Units (including transfers)
Redemption of Units (including transfers)	(109,397)
Transfer of Units In(Out)
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	187,285
Owners' Capital, Ending balance	2,463,170
Frontier Funds [Member] | Limited Owners [Member]
Owners' Capital, Beginning balance	25,285,922
Sale of Units (including transfers)
Redemption of Units (including transfers)	(28,300)
Payment made by Related Party
Payment made by Managing Owner
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,107,508
Owners' Capital, Ending balance	24,217,463
Frontier Funds [Member] | Managing Owner [Member]
Owners' Capital, Beginning balance	283,217
Sale of Units (including transfers)
Redemption of Units (including transfers)	(28,300)
Payment made by Related Party
Payment made by Managing Owner
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	12,702
Owners' Capital, Ending balance	267,619
Frontier Funds [Member]
Owners' Capital, Beginning balance	25,569,139
Sale of Units (including transfers)
Redemption of Units (including transfers)	(2,204,267)
Payment made by Related Party
Payment made by Managing Owner
Net increase/(decrease) in Owners’ Capital resulting from operations attributable to controlling interests	1,120,210
Owners' Capital, Ending balance	$ 24,485,082

Statements of Cash Flows (Unaud

Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	$ 120,198	$ (2,251,871)
Change in:
Net change in ownership allocation of U.S. Treasury securities	110,091	464,949
Net unrealized (gain)/loss on swap contracts		2,111,698
Net unrealized (gain)/loss on U.S. Treasury securities	440	(23,218)
Net realized (gain)/loss on U.S. Treasuries securities	1,741	16,266
Net unrealized (gain)/loss on private investment companies	(192,750)	(115,286)
Net realized (gain)/loss on private investment companies	45,015	149,796
Sales of U.S. Treasury securities	311,471	171,210
(Purchases) of U.S. Treasury securities	(119,541)	(550,460)
U.S. Treasury interest and premium paid/amortized	1,587
(Purchases) of Private Investment Companies	(296,684)	(387,849)
Reduction of collateral in Swap contracts		(469,147)
Sale of Private Investment Companies	271,904	2,546,860
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(7,062)	13,738
Interest receivable	7,711	1,829
Receivable from related parties	4,892
Other assets		(463)
Redemptions receivable from private investment companies	1,023
Interest payable to Managing Owner
Trading fees payable to Managing Owner	(235)	(8,152)
Service fees payable to Managing Owner	(20)	(1,531)
Subscriptions in advance for service fee rebates		98
Other liabilities	(520)
Net cash provided by (used in) operating activities	259,261	1,668,467
Cash Flows from Financing Activities:
Payment for redemption of units	(273,449)	(1,495,298)
Change in owner redemptions payable
Net cash provided by (used in) financing activities	(273,449)	(1,495,298)
Net increase (decrease) in cash and cash equivalents	(14,188)	173,169
Cash and cash equivalents, beginning of period	87,715	56,263
Cash and cash equivalents, end of period	73,527	229,432
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	44,023	(22,210)
Change in:
Net change in ownership allocation of U.S. Treasury securities	(114,658)	(124,907)
Net unrealized (gain)/loss on swap contracts
Net unrealized (gain)/loss on U.S. Treasury securities	250	1,929
Net realized (gain)/loss on U.S. Treasuries securities	1,004	(7,304)
Net unrealized (gain)/loss on private investment companies	(44,385)	(246,694)
Net realized (gain)/loss on private investment companies	(2,640)	(235,137)
Sales of U.S. Treasury securities	139,800	468,240
(Purchases) of U.S. Treasury securities	(73,698)	(309,637)
U.S. Treasury interest and premium paid/amortized	855	990
(Purchases) of Private Investment Companies	42,348	333,863
Reduction of collateral in Swap contracts
Sale of Private Investment Companies	136,192	410,024
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(12,693)	2,978
Interest receivable	(8)	771
Receivable from related parties	266
Other assets
Redemptions receivable from private investment companies	1,688
Interest payable to Managing Owner
Trading fees payable to Managing Owner	(225)	(2,332)
Service fees payable to Managing Owner	4	(5)
Subscriptions in advance for service fee rebates		184
Other liabilities	1,314	(14)
Net cash provided by (used in) operating activities	119,437	270,739
Cash Flows from Financing Activities:
Payment for redemption of units	(43,942)	(119,501)
Change in owner redemptions payable	(38,128)
Net cash provided by (used in) financing activities	(82,070)	(119,501)
Net increase (decrease) in cash and cash equivalents	37,367	151,238
Cash and cash equivalents, beginning of period	4,771	25,639
Cash and cash equivalents, end of period	42,138	176,877
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	68,102	113,697
Change in:
Net change in ownership allocation of U.S. Treasury securities	(37,595)	(139,395)
Net unrealized (gain)/loss on swap contracts		(251,441)
Net unrealized (gain)/loss on U.S. Treasury securities	25	1,916
Net realized (gain)/loss on U.S. Treasuries securities	1,950	(5,194)
Net unrealized (gain)/loss on private investment companies	(62,988)	59,841
Net realized (gain)/loss on private investment companies	(2,596)	67,371
Sales of U.S. Treasury securities	480,065	404,529
(Purchases) of U.S. Treasury securities	(70,909)	(213,319)
U.S. Treasury interest and premium paid/amortized	1,279	647
(Purchases) of Private Investment Companies	(427,448)	(36,300)
Reduction of collateral in Swap contracts
Sale of Private Investment Companies	30,295	96,524
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	2,139	8,976
Interest receivable	8,539	1,172
Receivable from related parties	5,205
Other assets
Redemptions receivable from private investment companies	1,251
Interest payable to Managing Owner	(34)
Trading fees payable to Managing Owner	893	(421)
Service fees payable to Managing Owner	(18)
Subscriptions in advance for service fee rebates	18	76
Other liabilities	(1,605)	(321)
Net cash provided by (used in) operating activities	(3,432)	108,358
Cash Flows from Financing Activities:
Payment for redemption of units	(41,767)	(9,670)
Change in owner redemptions payable	196	(6,585)
Net cash provided by (used in) financing activities	(41,571)	(16,255)
Net increase (decrease) in cash and cash equivalents	(45,003)	92,103
Cash and cash equivalents, beginning of period	93,327	34,272
Cash and cash equivalents, end of period	48,324	126,375
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	502,970	(5,742,717)
Change in:
Net change in open trade equity, at fair value	47,333	114,076
Net change in ownership allocation of U.S. Treasury securities	553,920	(125,149)
Net unrealized (gain)/loss on swap contracts		5,837,508
Net unrealized (gain)/loss on U.S. Treasury securities	252	(1,596)
Net realized (gain)/loss on U.S. Treasuries securities	621	(20,156)
Net unrealized (gain)/loss on private investment companies	(566,349)	93,693
Net realized (gain)/loss on private investment companies	128,881	93,600
Sales of U.S. Treasury securities	698,197	1,199,775
(Purchases) of U.S. Treasury securities	(150,822)	(959,751)
U.S. Treasury interest and premium paid/amortized		6,311
(Purchases) of Private Investment Companies	(205,635)	(937,631)
Sale of Private Investment Companies	685,847	2,403,311
Increase and/or decrease in:
Receivable from futures commission merchants	(507,424)	2,380,910
Control of ownership of trading companies		(1,178,697)
Investments in unconsolidated trading companies, at fair value	15,901	(4,227)
Interest receivable	24,271	3,223
Receivable from related parties	14,602
Other assets		(1,100,000)
Redemptions receivable from private investment companies	15,455
Incentive fees payable to Managing Owner	49,840
Management fees payable to Managing Owner	(7,225)	320
Interest payable to Managing Owner	(1,376)	939
Trading fees payable to Managing Owner	258	(11,898)
Service fees payable to Managing Owner	(555)	(9,006)
Risk analysis fees payable	1,385	1,506
Payables to related parties
Subscriptions in advance for service fee rebates	5,556	9,481
Other liabilities	(1,048)	1,031
Net cash provided by (used in) operating activities	1,304,855	2,054,856
Cash Flows from Financing Activities:
Proceeds from sale of units
Payment for redemption of units	(1,461,767)	(920,299)
Payment made by the Managing Owner
Pending owner additions
Advance on unrealized Swap Appreciation
Change in owner redemptions payable		(39,059)
Net cash provided by (used in) financing activities	(1,461,767)	(959,358)
Net increase (decrease) in cash and cash equivalents	(156,912)	1,095,498
Cash and cash equivalents, beginning of period	261,803	118,506
Cash and cash equivalents, end of period	104,891	1,214,004
The Series of Frontier Funds [Member] | Frontier Select Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	108,993	44,689
Change in:
Net change in open trade equity, at fair value
Net change in ownership allocation of U.S. Treasury securities	(130,085)	(103,949)
Net unrealized (gain)/loss on swap contracts
Net unrealized (gain)/loss on U.S. Treasury securities	190	2,216
Net realized (gain)/loss on U.S. Treasuries securities	1,017	(5,292)
Net unrealized (gain)/loss on private investment companies	(77,023)	22,952
Net realized (gain)/loss on private investment companies	(47,430)	(7,923)
Sales of U.S. Treasury securities	160,121	501,211
(Purchases) of U.S. Treasury securities	(80,385)	(298,083)
U.S. Treasury interest and premium paid/amortized
(Purchases) of Private Investment Companies	32,782	(115,441)
Sale of Private Investment Companies	209,960	290,105
Increase and/or decrease in:
Receivable from futures commission merchants
Control of ownership of trading companies
Investments in unconsolidated trading companies, at fair value	(9,590)	(80,195)
Interest receivable	(333)	2,149
Receivable from related parties
Other assets
Redemptions receivable from private investment companies	2,141
Incentive fees payable to Managing Owner
Management fees payable to Managing Owner
Interest payable to Managing Owner	180	132
Trading fees payable to Managing Owner	(18)	(856)
Service fees payable to Managing Owner	94	(562)
Risk analysis fees payable
Payables to related parties	(26,129)
Subscriptions in advance for service fee rebates	441	882
Other liabilities	1,047	(819)
Net cash provided by (used in) operating activities	145,973	251,216
Cash Flows from Financing Activities:
Proceeds from sale of units
Payment for redemption of units	(132,467)	(168,184)
Payment made by the Managing Owner
Pending owner additions
Advance on unrealized Swap Appreciation
Change in owner redemptions payable	16,207	(6,875)
Net cash provided by (used in) financing activities	(116,260)	(175,059)
Net increase (decrease) in cash and cash equivalents	29,713	76,157
Cash and cash equivalents, beginning of period		61,345
Cash and cash equivalents, end of period	29,713	137,502
The Series of Frontier Funds [Member] | Frontier Global Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	88,639	473,709
Change in:
Net change in ownership allocation of U.S. Treasury securities	(296,241)	(279,777)
Net unrealized (gain)/loss on swap contracts
Net unrealized (gain)/loss on U.S. Treasury securities	526	5,491
Net realized (gain)/loss on U.S. Treasuries securities	1,735	(11,493)
Net unrealized (gain)/loss on private investment companies	(92,170)	(249,122)
Net realized (gain)/loss on private investment companies	(37,665)	(309,658)
Sales of U.S. Treasury securities	309,138	647,979
(Purchases) of U.S. Treasury securities	(129,732)	(336,006)
U.S. Treasury interest and premium paid/amortized
Sales of swap contracts
(Purchases) of Private Investment Companies	61,767	(120,247)
Reduction of collateral in Swap contracts
Sale of Private Investment Companies	336,767	1,305,756
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(26,691)	563
Interest receivable	(409)	778
Receivable from related parties	319
Management fees payable to Managing Owner
Interest payable to Managing Owner	173	788
Trading fees payable to Managing Owner	461	(5,030)
Service fees payable to Managing Owner	211	(1,476)
Payables to related parties
Subscriptions in advance for service fee rebates	1,004	1,502
Other liabilities	2,827	140
Net cash provided by (used in) operating activities	220,659	1,123,897
Cash Flows from Financing Activities:
Payment for redemption of units	(141,476)	(832,035)
Change in owner redemptions payable	1,174	(71,379)
Net cash provided by (used in) financing activities	(140,302)	(903,414)
Net increase (decrease) in cash and cash equivalents	80,357	220,483
Cash and cash equivalents, beginning of period	5,694	27,532
Cash and cash equivalents, end of period	86,051	248,015
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	187,285	579,154
Change in:
Net change in ownership allocation of U.S. Treasury securities	(93,697)	(39,622)
Net unrealized (gain)/loss on swap contracts		(83,006)
Net unrealized (gain)/loss on U.S. Treasury securities	484	6,631
Net realized (gain)/loss on U.S. Treasuries securities	1,201	(10,916)
Net unrealized (gain)/loss on private investment companies	(209,744)	(741,499)
Net realized (gain)/loss on private investment companies	(6,431)	125,925
Sales of U.S. Treasury securities	152,163	1,980,729
(Purchases) of U.S. Treasury securities	(103,772)	(1,446,573)
U.S. Treasury interest and premium paid/amortized		(6)
Sales of swap contracts	1,491,965
(Purchases) of Private Investment Companies	62,005	(750,704)
Reduction of collateral in Swap contracts	(1,491,965)
Sale of Private Investment Companies	188,649	1,293,592
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(20,045)	687,202
Interest receivable	680	5,634
Receivable from related parties	845
Management fees payable to Managing Owner		(9,201)
Interest payable to Managing Owner	424	(764)
Trading fees payable to Managing Owner	655	2,200
Service fees payable to Managing Owner	375	(350)
Payables to related parties		697
Subscriptions in advance for service fee rebates	1,524	9,185
Other liabilities	1,964	2,165
Net cash provided by (used in) operating activities	164,565	1,610,473
Cash Flows from Financing Activities:
Payment for redemption of units	(109,398)	(1,003,869)
Change in owner redemptions payable	704	7,210
Net cash provided by (used in) financing activities	(108,694)	(996,659)
Net increase (decrease) in cash and cash equivalents	55,871	613,814
Cash and cash equivalents, beginning of period	15,156	135,096
Cash and cash equivalents, end of period	71,027	748,910
Frontier Funds [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	1,120,210	(6,905,836)
Change in:
Net change in open trade equity, at fair value	47,333	114,076
Net unrealized (gain)/loss on swap contracts		7,490,918
Net unrealized (gain)/loss on U.S. Treasury securities	2,167	(12,311)
Net realized (gain)/loss on U.S. Treasuries securities	9,269	(39,967)
Net unrealized (gain)/loss on private investment companies	(1,309,008)	(792,691)
Net realized (gain)/loss on private investment companies	82,585	219,121
(Purchases) of swap contracts		(1,647,845)
Sales of U.S. Treasury securities	2,250,954	3,421,048
(Purchases) of U.S. Treasury securities	(737,123)	(2,941,281)
U.S. Treasury interest and premium paid/amortized	3,721	15,565
(Purchases) of Private Investment Companies	(730,758)	(1,974,303)
Sale of Private Investment Companies	1,859,615	7,444,555
Increase and/or decrease in:
Receivable from futures commission merchants	(507,424)	2,380,910
Interest receivable	40,451	11,377
Receivable from related parties	26,129
Other assets		(1,100,463)
Redemptions receivable from private investment companies	21,558
Incentive fees receivable to Managing Owner	49,840
Management fees payable to Managing Owner, net of change in receivable	(7,225)	320
Interest payable to Managing Owner	(633)	2,256
Trading fees payable to Managing Owner	1,789	(28,708)
Service fees payable to Managing Owner	91	(12,056)
Risk analysis fees payable	1,385	1,506
Payables to related parties	(26,129)
Subscriptions in advance for service fee rebates	8,543	13,926
Other liabilities	3,979	(419)
Net cash provided by (used in) operating activities	2,211,319	5,659,698
Cash Flows from Financing Activities:
Payment for redemption of capital	(2,204,267)	(3,609,228)
Redemptions payable	(19,847)	(133,633)
Net cash provided by (used in) financing activities	(2,224,114)	(3,742,861)
Net increase (decrease) in cash and cash equivalents	(12,795)	1,916,837
Cash and cash equivalents, beginning of period	468,466	367,568
Cash and cash equivalents, end of period	$ 455,671	$ 2,284,405

Organization and Purpose

Organization and Purpose	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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 (the "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 March 31, 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 (formerly Frontier Winton 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 Long/Short Commodity Fund Class 1A was closed as of September 30, 2020 and Frontier Global Class 1AP was closed as of November 18, 2020. 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.
Frontier Funds [Member]
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 Commodity Futures Trading Commission ("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 entities ("Galaxy Plus"). 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 vested 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 Long/Short Commodity Fund Class 1A was closed as of September 30, 2020 and Frontier Global Class 1AP was closed as of November 18, 2020. 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, is maintained in the books and records of each Series. As of March 31, 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 (formerly Frontier Winton 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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Series' ownership percentage in Galaxy Plus. 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. Change in Consolidation Method 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— 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, $411, $31,725, $352,411, $19,904, $155,675, and $64,729 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively, as of March 31, 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. Frontier Long/Short Commodity Fund Class 1A was closed as of September 30, 2020 and Frontier Global Class 1AP was closed as of November 18, 2020. Pending Owner Additions— Owner redemptions payable— Recently Adopted Accounting Pronouncements— Subsequent Events—The Series, follows the provisions of ASC 855, Subsequent Events
Frontier Funds [Member]
Significant Accounting Policies	2. Significant Accounting Policies The following are the significant accounting policies of the Trust. Basis of Presentation Consolidation Galaxy Plus entities are co-mingled investment vehicles. In addition to the Trust, there are other non-affiliated investors in Galaxy Plus. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Trust ownership percentage in Galaxy Plus. 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. Change in Consolidation Method— 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— 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 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 $638,962 and $647,505 as of December 31, 2020 and March 31, 2021, 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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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 upon daily reports from the counterparty. In addition, a third party takes the inputs from the counterparty, makes certain adjustments, and runs it through their pricing model to come up with their daily price. The fair value measurements of the swap contracts are valued using unadjusted inputs that were not internally developed. The Managing Owner reviews and compares approves current day pricing of the CTA positions, as received from the counterparty which includes intra-day volatility and volume and daily index performance, as well as from the third party. Differences in prices exceeding 5% are investigated. Unexplainable differences are escalated to the Managing Owner's Valuation Committee for evaluation and resolution. Swap contracts are reported at fair value using Level 3 inputs. 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 March 31, 2021 and December 31, 2020 segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value. March 31, 2021 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies $ 23,731 $ - $ - $ 23,731 U.S. Treasury Securities 121,604 - - 121,604 Frontier Masters Fund Investment in Unconsolidated Trading Companies 13,600 - - 13,600 U.S. Treasury Securities 69,690 - - 69,690 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 15,597 - - 15,597 U.S. Treasury Securities 79,922 - - 79,922 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 33,854 - - 33,854 Open Trade Equity (Deficit) 53,107 - - 53,107 U.S. Treasury Securities 173,475 - - 173,475 Frontier Select Fund - Investment in Unconsolidated Trading Companies 9,590 - - 9,590 U.S. Treasury Securities 49,141 - - 49,141 Frontier Global Fund - Investment in Unconsolidated Trading Companies 27,774 - - 27,774 U.S. Treasury Securities 142,316 - - 142,316 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 22,925 - - 22,925 U.S. Treasury Securities 117,469 - - 117,469 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 three months ended March 31, 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 own the Frontier Brevan Howard swap. The Frontier Heritage Fund owns 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	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 March 31, 2021 and December 31, 2020, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value: March 31, 2021 Level 1 Level 2 Level 3 Fair Open Trade Equity (Deficit) $ 53,107 $ - $ - $ 53,107 U.S. Treasury Securities 753,617 - - 753,617 December 31, 2020 Level 1 Level 2 Level 3 Fair Open Trade Equity (Deficit) $ 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 Year 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 three months ended March 31, 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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Swap Contracts	4. Swap Contracts In addition to authorizing Trading Advisors to manage pre-determined 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 December 31, 2020, approximately 0.00%, 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 Return Total Return Total Return Total Return 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	4. Swap Contracts In addition to authorizing Trading Advisors to manage pre-determined 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 XXXV XXXVII L/S select swap Brevan Howard Total Return Total Return Total Return Total Return Counterparty Deutsche Bank Deutsche Bank Deutsche Bank Deutsche Bank 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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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 of 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 March 31, 2021 and December 31, 2020: As of March 31, 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 0.59 % $ 23,731 0.40 % $ 16,669 Frontier Masters Fund --- Frontier Trading Company XXXVIII 1.37 % $ 13,600 0.09 % $ 907 Frontier Long/Short Commodity Fund --- Frontier Trading Company XXXVIII 1.16 % $ 15,597 1.35 % $ 17,736 Frontier Balanced Fund --- Frontier Trading Company XXXVIII 0.30 % $ 33,854 0.41 % $ 49,755 Frontier Select Fund --- Frontier Trading Companies XXXVIII 0.59 % $ 9,590 0.00 % $ 0 Frontier Global Fund --- Frontier Trading Company XXXVIII 0.97 % $ 27,774 0.04 % $ 1,083 Frontier Heritage Fund --- Frontier Trading Company XXXVIII 0.93 % $ 22,925 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 months ended March 31, 2021 and March 31, 2020. Three Months Ended March, 2021 Three Months Ended March, 2020 Change in Net Change in Net Trading Realized Unrealized Income Trading Realized Unrealized Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Frontier Balanced Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (15,154 ) $ (15,154 ) $ - $ - $ (23,301 ) $ (23,301 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,608 ) 105,068 4,402 107,862 - 101,444 260,300 361,744 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - - - - - (6,308 ) (41,608 ) (47,916 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (310,754 ) (332,663 ) (643,417 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (6,767 ) 96,963 (211,084 ) (120,888 ) - 78,918 (356,986 ) (278,068 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - - - - - 7,506 (259,157 ) (251,651 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (2,499 ) (183,383 ) 7,536 (178,346 ) - 25,548 (298,885 ) (273,337 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (4,323 ) 49,066 109,945 154,688 - (23,195 ) 166,919 143,724 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (11,862 ) 665,706 (74,900 ) 578,944 - 33,241 768,387 801,628 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (940 ) (501,183 ) 394,602 (107,521 ) - - - - Total $ (27,999 ) $ 232,237 $ 215,347 $ 419,585 $ - $ (93,600 ) $ (116,994 ) $ (210,594 ) Frontier Global Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 13,872 $ 13,872 $ - $ - $ (5,077 ) $ (5,077 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (2,508 ) 172,894 (40,552 ) 129,834 - 309,658 249,122 558,780 Total $ (2,508 ) $ 172,894 $ (26,680 ) $ 143,706 $ - $ 309,658 $ 244,045 $ 553,703 Frontier Select Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 7,332 $ 7,332 $ - $ - $ (6,529 ) $ (6,529 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (3,497 ) 198,489 (21,623 ) 173,369 - 24,954 236,122 261,076 Galaxy Plus Fund - TT Feeder Fund (531) LLC - - - - - (17,031 ) (259,074 ) (276,105 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (392 ) (215,079 ) 166,556 (48,915 ) - - - - Total $ (3,889 ) $ (16,590 ) $ 152,265 $ 131,786 $ - $ 7,923 $ (29,481 ) $ (21,558 ) Frontier Heritage Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 10,944 $ 10,944 $ - $ - $ (6,103 ) $ (6,103 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,340 ) 93,684 (29,457 ) 62,887 - 33,962 142,571 176,533 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (3,124 ) 179,878 (23,467 ) 153,287 - (29,591 ) 273,543 243,952 Total $ (4,464 ) $ 273,562 $ (41,980 ) $ 227,118 $ - $ 4,371 $ 410,011 $ 414,382 Frontier Long/Short Commodity Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 10,148 $ 10,148 $ - $ - $ (4,706 ) $ (4,706 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (61,736 ) (33,649 ) (95,385 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (229 ) 23,549 (18,332 ) 4,988 - 820 (137,741 ) (136,921 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (1,861 ) 105,715 (12,891 ) 90,963 - (6,455 ) 111,549 105,094 Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) (1,808 ) - (28,559 ) (30,367 ) - - - - Total $ (3,898 ) $ 129,264 $ (49,634 ) $ 75,732 $ - $ (67,371 ) $ (64,547 ) $ (131,918 ) Frontier Diversified Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 8,063 $ 8,063 $ - $ - $ (1,009 ) $ (1,009 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (753 ) 52,525 (1,159 ) 50,613 - 88,315 152,312 240,627 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - - - - - (10,522 ) (20,678 ) (31,200 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (268,381 ) (144,944 ) (413,325 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (3,231 ) 47,548 (95,237 ) (50,920 ) - 109,016 (298,106 ) (189,090 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - - - - - 3,721 (159,251 ) (155,530 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (640 ) (46,172 ) (2,167 ) (48,979 ) - (53,371 ) (32,636 ) (86,007 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (2,763 ) 30,374 90,227 117,838 - (12,007 ) 134,066 122,059 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,011 ) 110,869 (5,456 ) 103,402 - (6,567 ) 484,523 477,956 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (219 ) (118,037 ) 94,039 (24,217 ) - - - - Total $ (9,617 ) $ 77,107 $ 88,310 $ 155,800 $ - $ (149,796 ) $ 114,277 $ (35,519 ) Frontier Masters Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 11,507 $ 11,507 $ - $ - $ (6,482 ) $ (6,482 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (353 ) 23,632 (5,892 ) 17,387 - 28,637 104,600 133,237 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (248,608 ) 88,339 (160,269 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (1,062 ) 60,348 (7,732 ) 51,554 - (21,114 ) 156,235 135,121 Galaxy Plus Fund - TT Feeder Fund (531) LLC - - - - - 5,948 (102,480 ) (96,532 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (156 ) (83,540 ) 61,779 (21,917 ) - - - - Total $ (1,571 ) $ 440 $ 59,662 $ 58,531 $ - $ (235,137 ) $ 240,212 $ 5,075 The Series' investments in private investment companies as of March 31, 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	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 entities are made up of feeder funds in which the Trust invests 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 Trust's total capital. The following table summarizes the Trust's equity in earnings from each of the private investment companies during the three months ended March 31, 2021 and March 31, 2020: Three Months Ended March, 2021 Three Months Ended March, 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 $ (6,562 ) $ 447,803 $ (72,658 ) $ 368,583 $ - $ 562,016 $ 908,905 $ 1,470,921 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - - - - - (16,830 ) (62,286 ) (79,116 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (889,479 ) (422,917 ) (1,312,396 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (9,998 ) 144,511 (306,321 ) (171,808 ) - 187,934 (655,091 ) (467,157 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (229 ) 23,549 (18,332 ) 4,988 - 12,047 (556,149 ) (544,102 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (3,139 ) (229,555 ) 5,369 (227,325 ) - (27,823 ) (331,521 ) (359,344 ) Galaxy Plus Fund - Quantmetrics Feeder Fund (527) LLC - - - - - - - - Galaxy Plus Fund - Quest Feeder Fund (517) LLC (7,086 ) 79,440 200,172 272,526 - (35,202 ) 300,986 265,784 Galaxy Plus Fund - Quest FIT Feeder Fund (535) LLC - - 58,149 58,149 - - - - Galaxy Plus Fund - TT Feeder Fund (531) LLC - - - - - (11,083 ) (361,554 ) (372,637 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (23,417 ) 1,321,005 (146,069 ) 1,151,519 - (5,532 ) 2,030,359 2,024,827 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (1,707 ) (917,839 ) 716,976 (202,570 ) - - - Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) (1,808 ) - (28,559 ) (30,367 ) Total $ (53,946 ) $ 868,914 $ 408,727 $ 1,223,695 $ - $ (223,952 ) $ 850,732 $ 626,780 The Trust's investments in private investment companies as of March 31, 2021 have certain redemption and liquidity restrictions which are described in the following table: Redemptions Redemptions Liquidity 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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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 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— 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, $411, $31,725, $352,411, $19,904, $155,675 and $64,729 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 and the Former Managing Owner for the three months ended March 31, 2021 and 2020. Three Months Ended March 31, 2021 Incentive Management Service Trading Frontier Diversified Fund $ - $ - $ 1,049 $ 34,937 Frontier Masters Fund - - 210 14,863 Frontier Long/Short Commodity Fund - - 54 8,765 Frontier Balanced Fund 49,840 4,619 67,267 114,439 Frontier Select Fund - - 11,438 11,355 Frontier Global Fund - - 19,938 35,130 Frontier Heritage Fund - - 16,157 23,676 Three Months Ended March 31, 2020 Incentive (Rebate) Fees Management Fee Service Trading Frontier Diversified Fund $ - $ - $ 7,707 $ 103,933 Frontier Masters Fund - - 595 33,055 Frontier Long/Short Commodity Fund - - 111 9,640 Frontier Balanced Fund - 5,020 125,308 198,985 Frontier Select Fund - - 20,160 16,955 Frontier Global Fund - - 30,441 55,555 Frontier Heritage Fund - - 18,013 29,905 The following table summarizes fees payable to the Managing Owner and Former Managing Owner as of March 31, 2021 and December 31, 2020. As of March 31, 2021 Incentive Management Interest Service Trading Frontier Diversified Fund $ - $ - $ - $ 365 $ 12,341 Frontier Masters Fund - - - 74 5,235 Frontier Long/Short Commodity Fund - - 53 - 3,174 Frontier Balanced Fund 49,840 1,629 - 20,826 38,152 Frontier Select Fund - - 359 3,803 3,915 Frontier Global Fund - - 499 6,559 12,310 Frontier Heritage Fund - - 563 5,169 8,360 As of December 31, 2020 Incentive Management Interest Service Trading 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 Long/Short Commodity Fund Class 1A was closed as of September 30, 2020 and Frontier Global Class 1AP was closed as of November 18, 2020. 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 months ended March 31, 2021 and 2020. Three Months Ended March 31, March 31, March 31, March 31, Gross Amount Paid to the Managing Owner Gross Amount Paid to the Managing Owner Ratio to Average Net Assets Ratio to Average Net Assets 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 8 5 0.02 % 0.01 % Frontier Long/Short Commodity Fund Class 3 226 114 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 1 301 2,221 0.00 % 0.01 % Frontier Balanced Fund Class 1AP 3 31 0.00 % 0.01 % Frontier Balanced Fund Class 2 69 425 0.00 % 0.01 % Frontier Balanced Fund Class 2a 1 5 0.00 % 0.00 % Frontier Balanced Fund Class 3a 3 23 0.00 % 0.00 % Frontier Select Fund Class 1 790 779 0.05 % 0.03 % Frontier Select Fund Class 1AP 5 3 0.05 % 0.03 % Frontier Select Fund Class 2 35 26 0.05 % 0.03 % Frontier Global Fund Class 1 1,455 1,217 0.05 % 0.03 % Frontier Global Fund Class 1AP - 11 0.00 % 0.03 % Frontier Global Fund Class 2 103 111 0.05 % 0.03 % Frontier Heritage Fund Class 1 1,038 728 0.05 % 0.03 % Frontier Heritage Fund Class 1AP 4 3 0.05 % 0.03 % Frontier Heritage Fund Class 2 104 170 0.05 % 0.03 % Total $ 4,145 $ 5,872
Frontier Funds [Member]
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 March 31, 2021, the Trust had a payable to the Managing Owner in the amounts of $49,840, $1,629, $1,474, $83,487 and $36,796 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 three months ended March 31, 2021, the Managing Owner earned $49,840, $4,619, $116,113, and $243,165 for incentive fees, management fees, service fees, and trading fees, respectively. For the three months ended March 31, 2020, the Managing Owner earned $0, $5,020, $202,335 and $448,028 for incentive fees, management 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 March 31, 2021, and 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 March 31, 2021 and March 31, 2020, the Trust paid $4,145, and $5,872, 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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Financial Highlights	7. Financial Highlights The following information presents the financial highlights of the Series, for the three months ended March 31, 2021 and 2020. This data has been derived from the information presented in the financial statements. For the three months ended March 31, 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 0.03 0.03 0.05 0.06 0.06 0.09 0.06 0.09 0.06 Expenses (1.14 ) (0.80 ) (0.75 ) (2.05 ) (1.05 ) (0.99 ) (0.59 ) (0.38 ) (0.62 ) (0.40 ) Net gain/(loss) on investments, net of non-controlling interests 3.05 3.53 3.35 4.26 4.07 3.86 4.91 3.51 5.15 3.74 Net income/(loss) 1.94 2.76 2.64 2.26 3.07 2.93 4.40 3.20 4.61 3.40 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 Ratios to average net assets Net investment income/(loss) -6.16 % -3.43 % -3.43 % -14.43 % -5.85 % -5.85 % -2.26 % -2.26 % -2.26 % -2.26 % Expenses before incentive fees (3)(4) 6.31 % 3.59 % 3.59 % 14.78 % 6.20 % 6.20 % 2.65 % 2.65 % 2.65 % 2.65 % Expenses after incentive fees (3)(4) 6.31 % 3.59 % 3.59 % 14.78 % 6.20 % 6.20 % 2.65 % 2.65 % 2.65 % 2.65 % Total return before incentive fees (2) 2.67 % 3.11 % 3.16 % 4.10 % 4.55 % 4.61 % 5.12 % 5.79 % 5.11 % 5.82 % Total return after incentive fees (2) 2.67 % 3.11 % 3.16 % 4.10 % 4.55 % 4.61 % 5.12 % 5.79 % 5.11 % 5.82 % 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (1.78 ) (1.44 ) (1.94 ) (1.69 ) (1.68 ) (0.86 ) (0.51 ) (0.68 ) Net gain/(loss) on investments, net of non-controlling interests 5.24 6.38 8.61 7.47 7.45 4.87 5.93 7.88 Net income/(loss) 3.46 4.94 6.67 5.78 5.77 4.01 5.42 7.20 Net asset value, March 31, 2021 $ 83.39 $ 101.75 $ 137.21 $ 118.98 $ 118.58 $ 62.56 $ 76.41 $ 101.40 Ratios to average net assets Net investment income/(loss) -7.61 % -4.63 % -4.63 % -4.63 % -4.63 % -5.80 % -2.82 % -2.82 % Expenses before incentive fees (3)(4) 7.18 % 4.19 % 4.19 % 4.19 % 4.19 % 5.80 % 2.82 % 2.82 % Expenses after incentive fees (3)(4) 7.61 % 4.63 % 4.63 % 4.63 % 4.63 % 5.80 % 2.82 % 2.82 % Total return before incentive fees (2) 4.76 % 5.53 % 5.54 % 5.54 % 5.54 % 6.84 % 7.64 % 7.64 % Total return after incentive fees (2) 4.32 % 5.10 % 5.11 % 5.11 % 5.11 % 6.84 % 7.64 % 7.64 % 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 0.00 0.00 0.00 0.00 0.00 Expenses (2.21 ) (2.08 ) (1.74 ) (1.20 ) (1.61 ) Net gain/(loss) on investments, net of non-controlling interests 5.63 8.54 9.41 11.44 15.31 Net income/(loss) 3.42 6.45 7.67 10.24 13.70 Net asset value, March 31, 2021 $ 114.32 $ 174.01 $ 103.77 $ 126.74 $ 169.62 Ratios to average net assets Net investment income/(loss) -7.88 % -4.90 % -6.94 % -3.96 % -3.96 % Expenses before incentive fees (3)(4) 7.88 % 4.90 % 6.94 % 3.96 % 3.96 % Expenses after incentive fees (3)(4) 7.88 % 4.90 % 6.94 % 3.96 % 3.96 % Total return before incentive fees (2) 3.09 % 3.85 % 7.99 % 8.79 % 8.79 % Total return after incentive fees (2) 3.09 % 3.85 % 7.99 % 8.79 % 8.79 % (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 three months ended March 31, 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 0.00 0.00 0.00 0.03 0.04 0.04 0.02 0.04 0.03 0.04 0.03 Expenses (1.77 ) (1.11 ) (1.02 ) (4.46 ) (1.32 ) (1.24 ) (0.75 ) (0.59 ) (0.38 ) (0.62 ) (0.40 ) Net gain/(loss) on investments, net of non-controlling interests (20.18 ) (24.87 ) (23.20 ) 3.49 0.27 0.31 4.21 7.61 4.77 7.94 5.08 Net income/(loss) (21.95 ) (25.98 ) (24.22 ) (0.95 ) (1.01 ) (0.89 ) 3.49 7.06 4.42 7.36 4.71 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 Ratios to average net assets Net investment income/(loss) -7.11 % -3.68 % -3.68 % -24.52 % -5.87 % -5.87 % -6.43 % -2.64 % -2.64 % -2.64 % -2.64 % Expenses before incentive fees (3)(4) 7.11 % 3.68 % 3.68 % 24.70 % 6.05 % 6.05 % 6.62 % 2.83 % 2.83 % 2.83 % 2.83 % Expenses after incentive fees (3)(4) 7.11 % 3.68 % 3.68 % 24.70 % 6.05 % 6.05 % 6.62 % 2.83 % 2.83 % 2.83 % 2.83 % Total return before incentive fees (2) -21.71 % -21.37 % -21.32 % -1.31 % -1.15 % -1.09 % 7.89 % 8.65 % 8.40 % 8.60 % 8.52 % Total return after incentive fees (2) -21.71 % -21.37 % -21.32 % -1.31 % -1.15 % -1.09 % 7.89 % 8.65 % 8.40 % 8.60 % 8.52 % Incentive fee per share - - - - - - Incentive Fee to ANA 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 (1.94 ) (1.29 ) (1.73 ) (1.50 ) (1.50 ) (0.93 ) (0.49 ) (0.65 ) Net gain/(loss) on investments, net of non-controlling interests (29.31 ) (34.70 ) (46.77 ) (40.51 ) (40.39 ) 1.85 1.97 2.86 Net income/(loss) (31.21 ) (35.94 ) (48.45 ) (41.97 ) (41.84 ) 0.92 1.49 2.21 Net asset value, March 31, 2020 $ 86.02 $ 101.87 $ 137.37 $ 119.07 $ 118.66 $ 67.48 $ 79.99 $ 106.15 Ratios to average net assets Net investment income/(loss) -6.74 % -3.75 % -3.75 % -3.75 % -3.75 % -5.44 % -2.43 % -2.43 % Expenses before incentive fees (3)(4) 6.86 % 3.87 % 3.87 % 3.87 % 3.87 % 5.44 % 2.43 % 2.43 % Expenses after incentive fees (3)(4) 6.86 % 3.87 % 3.87 % 3.87 % 3.87 % 5.44 % 2.43 % 2.43 % Total return before incentive fees (2) -26.62 % -26.08 % -26.08 % -26.06 % -26.07 % 1.39 % 1.89 % 2.13 % Total return after incentive fees (2) -26.62 % -26.08 % -26.08 % -26.06 % -26.07 % 1.39 % 1.89 % 2.13 % 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 (2.73 ) (2.02 ) (2.51 ) (1.82 ) (1.24 ) (1.65 ) Net gain/(loss) on investments, net of non-controlling interests 17.19 20.67 25.33 18.50 22.46 29.23 Net income/(loss) 14.46 18.66 22.82 16.67 21.22 27.58 Net asset value, March 31, 2020 $ 145.97 $ 173.08 $ 215.64 $ 114.21 $ 135.37 $ 181.17 Ratios to average net assets Net investment income/(loss) -8.01 % -5.01 % -5.01 % -7.05 % -4.04 % -4.04 % Expenses before incentive fees (3)(4) 8.01 % 5.01 % 5.01 % 7.05 % 4.04 % 4.04 % Expenses after incentive fees (3)(4) 8.01 % 5.01 % 5.01 % 7.05 % 4.04 % 4.04 % Total return before incentive fees (2) 10.99 % 12.08 % 11.83 % 17.09 % 18.59 % 17.96 % Total return after incentive fees (2) 10.99 % 12.08 % 11.83 % 17.09 % 18.59 % 17.96 % (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	7. Financial Highlights The following information presents the financial highlights of the Trust for the three months ended March 31, 2021 and March 31, 2020. This data has been derived from the information presented in the consolidated financial statements. 2021 2020 Ratios to average net assets (1) Net investment income/(loss) (1) -6.20 % -5.77 % Expenses before incentive fees (3) (4) 6.06 % 5.84 % Expenses after incentive fees (3) (4) 6.26 % 5.84 % Total return before incentive fees (2) 6.45 % -15.26 % Total return after incentive fees (2) 4.56 % -15.26 % (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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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 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 March 31, 2021 Monthly average contracts: Bought Sold Frontier Balanced Fund 788 787 For the Three Months ended March 31, 2020 Monthly average contracts: Bought Sold Frontier Balanced Fund 628 625 The following tables summarize the trading revenues for the three months ended March 31, 2021, 2020 by sector: Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2021 Type of contract Frontier Fund Agriculturals $ 63,312 Currencies (27,812 ) Energies 34,820 Interest rates 106,786 Metals 23,335 Stock indices 171,118 Realized trading income/(loss) (1) $ 371,559 Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Frontier Fund Agriculturals $ 75,122 Currencies 106,325 Energies 35,710 Interest rates 88,571 Metals 313,738 Stock indices 22,768 Realized trading income/(loss) (1) $ 642,234 (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 March 31, 2021 Type of contract Frontier Fund Agriculturals $ 6,802 Currencies 17,052 Energies 16,600 Interest rates (76,782 ) Metals (15,723 ) Stock indices 4,716 Change in unrealized trading income/(loss) (1) $ (47,335 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Frontier Balanced Agriculturals $ 978 Currencies 21,386 Energies (1,845 ) Interest rates 4,169 Metals (43,253 ) Stock indices (7,154 ) Change in unrealized trading income/(loss) (1) $ (25,719 ) (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 FCM's 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 March 31, 2021 and December 31, 2020. As of March 31, 2021 Frontier Balanced Fund Gross Amounts of recognized Derivative Assets/ Gross Amounts offset in the Statements of Financial Condition Net Amounts Presented in the Statements of Financial Condition Open Trade Equity/(Deficit) $ 597,031 $ (543,924 ) $ 53,107 As of December 31, 2020 Frontier Balanced Fund Gross Amounts of recognized Derivative Assets Gross Amounts offset in the Statements of Financial Condition Net Amounts Presented in the Statements of Financial Condition Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440
Frontier Funds [Member]
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 March 31, 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 March 31, 2021 and March 31, 2020, the monthly average of futures, forwards and options contracts bought was approximately 788 and 628, respectively and sold was approximately 787 and 625, respectively. The following tables summarize the trading revenues for the three months ended March 31, 2021 and March 31, 2020 by contract type: Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2021 Type of contract Agriculturals $ 63,312 Currencies (27,812 ) Energies 34,820 Interest rates 106,786 Metals 23,335 Stock indices 171,119 Realized trading income/(loss) (1) $ 371,560 Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Agriculturals $ 75,122 Currencies 106,325 Energies 35,710 Interest rates 88,571 Metals 313,738 Stock indices 22,769 Realized trading income/(loss) (1) $ 642,235 (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 March 31, 2021 Type of contract Agriculturals $ 6,802 Currencies 17,052 Energies 16,600 Interest rates (76,782 ) Metals (15,723 ) Stock indices 4,716 Change in unrealized trading income/(loss) (1) $ (47,335 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Agriculturals $ 978 Currencies 21,386 Energies (1,845 ) Interest rates 4,169 Metals (43,253 ) Stock indices (7,154 ) Change in unrealized trading income/(loss) (1) $ (25,719 ) (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 FCM's 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 March 31, 2021 and December 31, 2020: As of March 31, 2021 Gross Gross Net Amounts Open Trade Equity/(Deficit) $ 597,031 $ (543,924 ) $ 53,107 As of December 31, 2020 Gross Gross Net Amounts Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440

Trading Activities and Related

Trading Activities and Related Risks	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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 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 in respect of any Series at the same time, and if the Trading Advisor(s) of such Trading Company are unable to offset such futures interests positions, such Trading Company 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. 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	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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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	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 Morgan Stanley & Co. LLC. 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	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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 April 1, 2021 through XXXX XX, 2021, Frontier Balanced Fund, Frontier Diversified Fund, Frontier Heritage Fund, Frontier Long/Short Commodity Fund, Frontier Masters Fund, Frontier Select Fund, and Frontier Global Fund paid $XXXX, $XXXX, $XXXX, $XXXX, $XXXX, $XXXX and $XXXX, respectively, in redemptions.
Frontier Funds [Member]
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 April 1, 2021 through xxxx xx, 2021, the Trust paid $xxxx in redemptions.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
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. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Series' ownership percentage in Galaxy Plus. 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.
Change in Consolidation Method	Change in Consolidation Method
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— 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 $22,629, $296, $31,725, $329,179, $17,777, $151,527 and $58,835 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively, as of March 31, 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. Frontier Long/Short Commodity Fund Class 1A was closed as of September 30, 2020 and Frontier Global Class 1AP was closed as of November 18, 2020.
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, follows the provisions of ASC 855, Subsequent Events
Frontier Funds [Member]
Basis of Presentation	Basis of Presentation
Consolidation	Consolidation Galaxy Plus entities are co-mingled investment vehicles. In addition to the Trust, there are other non-affiliated investors in Galaxy Plus. Subscriptions and redemptions by these non-affiliated investors will have a direct impact on the Trust ownership percentage in Galaxy Plus. 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.
Change in Consolidation Method	Change in Consolidation Method—
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— 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 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 $638,962 and $647,505 as of December 31, 2020 and March 31, 2021, 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

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Schedule of financial asset portfolio measured at fair value	March 31, 2021 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies $ 23,731 $ - $ - $ 23,731 U.S. Treasury Securities 121,604 - - 121,604 Frontier Masters Fund Investment in Unconsolidated Trading Companies 13,600 - - 13,600 U.S. Treasury Securities 69,690 - - 69,690 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 15,597 - - 15,597 U.S. Treasury Securities 79,922 - - 79,922 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 33,854 - - 33,854 Open Trade Equity (Deficit) 53,107 - - 53,107 U.S. Treasury Securities 173,475 - - 173,475 Frontier Select Fund - Investment in Unconsolidated Trading Companies 9,590 - - 9,590 U.S. Treasury Securities 49,141 - - 49,141 Frontier Global Fund - Investment in Unconsolidated Trading Companies 27,774 - - 27,774 U.S. Treasury Securities 142,316 - - 142,316 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 22,925 - - 22,925 U.S. Treasury Securities 117,469 - - 117,469 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 $ - $ - 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 $ -
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]
Schedule of financial asset portfolio measured at fair value	March 31, 2021 Level 1 Level 2 Level 3 Fair Open Trade Equity (Deficit) $ 53,107 $ - $ - $ 53,107 U.S. Treasury Securities 753,617 - - 753,617 December 31, 2020 Level 1 Level 2 Level 3 Fair Open Trade Equity (Deficit) $ 100,440 $ - $ - $ 100,440 U.S. Treasury Securities 2,282,606 - - 2,282,606
Schedule of change in unrealized appreciation (depreciation)	For the Year 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)	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Schedule of Investments in following swap	Frontier Frontier Frontier Frontier Total Return Total Return Total Return Total Return 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]
Schedule of Investments in following swap	XXXIV XXXV XXXVII L/S select swap Brevan Howard Total Return Total Return Total Return Total Return Counterparty Deutsche Bank Deutsche Bank Deutsche Bank Deutsche Bank 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)	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Schedule of investments in unconsolidated trading companies	As of March 31, 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 0.59 % $ 23,731 0.40 % $ 16,669 Frontier Masters Fund --- Frontier Trading Company XXXVIII 1.37 % $ 13,600 0.09 % $ 907 Frontier Long/Short Commodity Fund --- Frontier Trading Company XXXVIII 1.16 % $ 15,597 1.35 % $ 17,736 Frontier Balanced Fund --- Frontier Trading Company XXXVIII 0.30 % $ 33,854 0.41 % $ 49,755 Frontier Select Fund --- Frontier Trading Companies XXXVIII 0.60 % $ 9,590 0.00 % $ 0 Frontier Global Fund --- Frontier Trading Company XXXVIII 0.96 % $ 27,774 0.04 % $ 1,083 Frontier Heritage Fund --- Frontier Trading Company XXXVIII 0.93 % $ 22,925 0.12 % $ 2,880
Schedule of equity in earnings from unconsolidated trading companies and private investment companies	Three Months Ended March, 2021 Three Months Ended March, 2020 Change in Net Change in Net Trading Realized Unrealized Income Trading Realized Unrealized Income Commissions Gain/(Loss) Gain/(Loss) (Loss) Commissions Gain/(Loss) Gain/(Loss) (Loss) Frontier Balanced Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ (15,154 ) $ (15,154 ) $ - $ - $ (23,301 ) $ (23,301 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,608 ) 105,068 4,402 107,862 - 101,444 260,300 361,744 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - - - - - (6,308 ) (41,608 ) (47,916 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (310,754 ) (332,663 ) (643,417 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (6,767 ) 96,963 (211,084 ) (120,888 ) - 78,918 (356,986 ) (278,068 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - - - - - 7,506 (259,157 ) (251,651 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (2,499 ) (183,383 ) 7,536 (178,346 ) - 25,548 (298,885 ) (273,337 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (4,323 ) 49,066 109,945 154,688 - (23,195 ) 166,919 143,724 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (11,862 ) 665,706 (74,900 ) 578,944 - 33,241 768,387 801,628 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (940 ) (501,183 ) 394,602 (107,521 ) - - - - Total $ (27,999 ) $ 232,237 $ 215,347 $ 419,585 $ - $ (93,600 ) $ (116,994 ) $ (210,594 ) Frontier Global Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 13,872 $ 13,872 $ - $ - $ (5,077 ) $ (5,077 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (2,508 ) 172,894 (40,552 ) 129,834 - 309,658 249,122 558,780 Total $ (2,508 ) $ 172,894 $ (26,680 ) $ 143,706 $ - $ 309,658 $ 244,045 $ 553,703 Frontier Select Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 7,332 $ 7,332 $ - $ - $ (6,529 ) $ (6,529 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (3,497 ) 198,489 (21,623 ) 173,369 - 24,954 236,122 261,076 Galaxy Plus Fund - TT Feeder Fund (531) LLC - - - - - (17,031 ) (259,074 ) (276,105 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (392 ) (215,079 ) 166,556 (48,915 ) - - - - Total $ (3,889 ) $ (16,590 ) $ 152,265 $ 131,786 $ - $ 7,923 $ (29,481 ) $ (21,558 ) Frontier Heritage Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 10,944 $ 10,944 $ - $ - $ (6,103 ) $ (6,103 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (1,340 ) 93,684 (29,457 ) 62,887 - 33,962 142,571 176,533 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (3,124 ) 179,878 (23,467 ) 153,287 - (29,591 ) 273,543 243,952 Total $ (4,464 ) $ 273,562 $ (41,980 ) $ 227,118 $ - $ 4,371 $ 410,011 $ 414,382 Frontier Long/Short Commodity Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 10,148 $ 10,148 $ - $ - $ (4,706 ) $ (4,706 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (61,736 ) (33,649 ) (95,385 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC (229 ) 23,549 (18,332 ) 4,988 - 820 (137,741 ) (136,921 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (1,861 ) 105,715 (12,891 ) 90,963 - (6,455 ) 111,549 105,094 Galaxy Plus Fund – Volt Diversified Alpha Feeder Fund (550) LLC) (1,808 ) - (28,559 ) (30,367 ) - - - - Total $ (3,898 ) $ 129,264 $ (49,634 ) $ 75,732 $ - $ (67,371 ) $ (64,547 ) $ (131,918 ) Frontier Diversified Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 8,063 $ 8,063 $ - $ - $ (1,009 ) $ (1,009 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (753 ) 52,525 (1,159 ) 50,613 - 88,315 152,312 240,627 Galaxy Plus Fund - Doherty Feeder Fund (528) LLC - - - - - (10,522 ) (20,678 ) (31,200 ) Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (268,381 ) (144,944 ) (413,325 ) Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC (3,231 ) 47,548 (95,237 ) (50,920 ) - 109,016 (298,106 ) (189,090 ) Galaxy Plus Fund - LRR Feeder Fund (522) LLC - - - - - 3,721 (159,251 ) (155,530 ) Galaxy Plus Fund - QIM Feeder Fund (526) LLC (640 ) (46,172 ) (2,167 ) (48,979 ) - (53,371 ) (32,636 ) (86,007 ) Galaxy Plus Fund - Quest Feeder Fund (517) LLC (2,763 ) 30,374 90,227 117,838 - (12,007 ) 134,066 122,059 Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (2,011 ) 110,869 (5,456 ) 103,402 - (6,567 ) 484,523 477,956 Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (219 ) (118,037 ) 94,039 (24,217 ) - - - - Total $ (9,617 ) $ 77,107 $ 88,310 $ 155,800 $ - $ (149,796 ) $ 114,277 $ (35,519 ) Frontier Masters Fund Frontier Trading Company XXXVIII, LLC $ - $ - $ 11,507 $ 11,507 $ - $ - $ (6,482 ) $ (6,482 ) Galaxy Plus Fund - Aspect Feeder Fund (532) LLC (353 ) 23,632 (5,892 ) 17,387 - 28,637 104,600 133,237 Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC - - - - - (248,608 ) 88,339 (160,269 ) Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC (1,062 ) 60,348 (7,732 ) 51,554 - (21,114 ) 156,235 135,121 Galaxy Plus Fund - TT Feeder Fund (531) LLC - - - - - 5,948 (102,480 ) (96,532 ) Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) (156 ) (83,540 ) 61,779 (21,917 ) - - - - Total $ (1,571 ) $ 440 $ 59,662 $ 58,531 $ - $ (235,137 ) $ 240,212 $ 5,075
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]
Schedule of private investment companies have certain redemption and liquidity restrictions	Redemptions Redemptions Liquidity 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) - The Series of the Frontier Funds [Member]	3 Months Ended
	Mar. 31, 2021
Schedule of fees earned by managing owner	Three Months Ended March 31, 2021 Incentive Management Service Trading Frontier Diversified Fund $ - $ - $ 1,049 $ 34,937 Frontier Masters Fund - - 210 14,863 Frontier Long/Short Commodity Fund - - 54 8,765 Frontier Balanced Fund 49,840 4,619 67,267 114,439 Frontier Select Fund - - 11,438 11,355 Frontier Global Fund - - 19,938 35,130 Frontier Heritage Fund - - 16,157 23,676 Three Months Ended March 31, 2020 Incentive (Rebate) Fees Management Fee Service Trading Frontier Diversified Fund $ - $ - $ 7,707 $ 103,933 Frontier Masters Fund - - 595 33,055 Frontier Long/Short Commodity Fund - - 111 9,640 Frontier Balanced Fund - 5,020 125,308 198,985 Frontier Select Fund - - 20,160 16,955 Frontier Global Fund - - 30,441 55,555 Frontier Heritage Fund - - 18,013 29,905
Schedule of fees payable to managing owner	As of March 31, 2021 Incentive Management Interest Service Trading Frontier Diversified Fund $ - $ - $ - $ 365 $ 12,341 Frontier Masters Fund - - - 74 5,235 Frontier Long/Short Commodity Fund - - 53 - 3,174 Frontier Balanced Fund 49,840 1,629 - 20,826 38,152 Frontier Select Fund - - 359 3,803 3,915 Frontier Global Fund - - 499 6,559 12,310 Frontier Heritage Fund - - 563 5,169 8,360 As of December 31, 2020 Incentive Management Interest Service Trading 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
Schedule of interest paid by each series to managing owner	March 31, March 31, March 31, March 31, Gross Amount Paid to the Managing Owner Gross Amount Paid to the Managing Owner Ratio to Average Net Assets Ratio to Average Net Assets 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 8 5 0.02 % 0.01 % Frontier Long/Short Commodity Fund Class 3 226 114 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 1 301 2,221 0.00 % 0.01 % Frontier Balanced Fund Class 1AP 3 31 0.00 % 0.01 % Frontier Balanced Fund Class 2 69 425 0.00 % 0.01 % Frontier Balanced Fund Class 2a 1 5 0.00 % 0.00 % Frontier Balanced Fund Class 3a 3 23 0.00 % 0.00 % Frontier Select Fund Class 1 790 779 0.05 % 0.03 % Frontier Select Fund Class 1AP 5 3 0.05 % 0.03 % Frontier Select Fund Class 2 35 26 0.05 % 0.03 % Frontier Global Fund Class 1 1,455 1,217 0.05 % 0.03 % Frontier Global Fund Class 1AP - 11 0.00 % 0.03 % Frontier Global Fund Class 2 103 111 0.05 % 0.03 % Frontier Heritage Fund Class 1 1,038 728 0.05 % 0.03 % Frontier Heritage Fund Class 1AP 4 3 0.05 % 0.03 % Frontier Heritage Fund Class 2 104 170 0.05 % 0.03 % Total $ 4,145 $ 5,872

Financial Highlights (Tables)

Financial Highlights (Tables)	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Schedule of financial highlights of trust	For the three months ended March 31, 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 0.03 0.03 0.05 0.06 0.06 0.09 0.06 0.09 0.06 Expenses (1.14 ) (0.80 ) (0.75 ) (2.05 ) (1.05 ) (0.99 ) (0.59 ) (0.38 ) (0.62 ) (0.40 ) Net gain/(loss) on investments, net of non-controlling interests 3.05 3.53 3.35 4.26 4.07 3.86 4.91 3.51 5.15 3.74 Net income/(loss) 1.94 2.76 2.64 2.26 3.07 2.93 4.40 3.20 4.61 3.40 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 Ratios to average net assets Net investment income/(loss) -6.16 % -3.43 % -3.43 % -14.43 % -5.85 % -5.85 % -2.26 % -2.26 % -2.26 % -2.26 % Expenses before incentive fees (3)(4) 6.31 % 3.59 % 3.59 % 14.78 % 6.20 % 6.20 % 2.65 % 2.65 % 2.65 % 2.65 % Expenses after incentive fees (3)(4) 6.31 % 3.59 % 3.59 % 14.78 % 6.20 % 6.20 % 2.65 % 2.65 % 2.65 % 2.65 % Total return before incentive fees (2) 2.67 % 3.11 % 3.16 % 4.10 % 4.55 % 4.61 % 5.12 % 5.79 % 5.11 % 5.82 % Total return after incentive fees (2) 2.67 % 3.11 % 3.16 % 4.10 % 4.55 % 4.61 % 5.12 % 5.79 % 5.11 % 5.82 % 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Expenses (1.78 ) (1.44 ) (1.94 ) (1.69 ) (1.68 ) (0.86 ) (0.51 ) (0.68 ) Net gain/(loss) on investments, net of non-controlling interests 5.24 6.38 8.61 7.47 7.45 4.87 5.93 7.88 Net income/(loss) 3.46 4.94 6.67 5.78 5.77 4.01 5.42 7.20 Net asset value, March 31, 2021 $ 83.39 $ 101.75 $ 137.21 $ 118.98 $ 118.58 $ 62.56 $ 76.41 $ 101.40 Ratios to average net assets Net investment income/(loss) -7.61 % -4.63 % -4.63 % -4.63 % -4.63 % -5.80 % -2.82 % -2.82 % Expenses before incentive fees (3)(4) 7.18 % 4.19 % 4.19 % 4.19 % 4.19 % 5.80 % 2.82 % 2.82 % Expenses after incentive fees (3)(4) 7.61 % 4.63 % 4.63 % 4.63 % 4.63 % 5.80 % 2.82 % 2.82 % Total return before incentive fees (2) 4.76 % 5.53 % 5.54 % 5.54 % 5.54 % 6.84 % 7.64 % 7.64 % Total return after incentive fees (2) 4.32 % 5.10 % 5.11 % 5.11 % 5.11 % 6.84 % 7.64 % 7.64 % 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 0.00 0.00 0.00 0.00 0.00 Expenses (2.21 ) (2.08 ) (1.74 ) (1.20 ) (1.61 ) Net gain/(loss) on investments, net of non-controlling interests 5.63 8.54 9.41 11.44 15.31 Net income/(loss) 3.42 6.45 7.67 10.24 13.70 Net asset value, March 31, 2021 $ 114.32 $ 174.01 $ 103.77 $ 126.74 $ 169.62 Ratios to average net assets Net investment income/(loss) -7.88 % -4.90 % -6.94 % -3.96 % -3.96 % Expenses before incentive fees (3)(4) 7.88 % 4.90 % 6.94 % 3.96 % 3.96 % Expenses after incentive fees (3)(4) 7.88 % 4.90 % 6.94 % 3.96 % 3.96 % Total return before incentive fees (2) 3.09 % 3.85 % 7.99 % 8.79 % 8.79 % Total return after incentive fees (2) 3.09 % 3.85 % 7.99 % 8.79 % 8.79 % (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 three months ended March 31, 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 0.00 0.00 0.00 0.03 0.04 0.04 0.02 0.04 0.03 0.04 0.03 Expenses (1.77 ) (1.11 ) (1.02 ) (4.46 ) (1.32 ) (1.24 ) (0.75 ) (0.59 ) (0.38 ) (0.62 ) (0.40 ) Net gain/(loss) on investments, net of non-controlling interests (20.18 ) (24.87 ) (23.20 ) 3.49 0.27 0.31 4.21 7.61 4.77 7.94 5.08 Net income/(loss) (21.95 ) (25.98 ) (24.22 ) (0.95 ) (1.01 ) (0.89 ) 3.49 7.06 4.42 7.36 4.71 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 Ratios to average net assets Net investment income/(loss) -7.11 % -3.68 % -3.68 % -24.52 % -5.87 % -5.87 % -6.43 % -2.64 % -2.64 % -2.64 % -2.64 % Expenses before incentive fees (3)(4) 7.11 % 3.68 % 3.68 % 24.70 % 6.05 % 6.05 % 6.62 % 2.83 % 2.83 % 2.83 % 2.83 % Expenses after incentive fees (3)(4) 7.11 % 3.68 % 3.68 % 24.70 % 6.05 % 6.05 % 6.62 % 2.83 % 2.83 % 2.83 % 2.83 % Total return before incentive fees (2) -21.71 % -21.37 % -21.32 % -1.31 % -1.15 % -1.09 % 7.89 % 8.65 % 8.40 % 8.60 % 8.52 % Total return after incentive fees (2) -21.71 % -21.37 % -21.32 % -1.31 % -1.15 % -1.09 % 7.89 % 8.65 % 8.40 % 8.60 % 8.52 % Incentive fee per share - - - - - - Incentive Fee to ANA 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 (1.94 ) (1.29 ) (1.73 ) (1.50 ) (1.50 ) (0.93 ) (0.49 ) (0.65 ) Net gain/(loss) on investments, net of non-controlling interests (29.31 ) (34.70 ) (46.77 ) (40.51 ) (40.39 ) 1.85 1.97 2.86 Net income/(loss) (31.21 ) (35.94 ) (48.45 ) (41.97 ) (41.84 ) 0.92 1.49 2.21 Net asset value, March 31, 2020 $ 86.02 $ 101.87 $ 137.37 $ 119.07 $ 118.66 $ 67.48 $ 79.99 $ 106.15 Ratios to average net assets Net investment income/(loss) -6.74 % -3.75 % -3.75 % -3.75 % -3.75 % -5.44 % -2.43 % -2.43 % Expenses before incentive fees (3)(4) 6.86 % 3.87 % 3.87 % 3.87 % 3.87 % 5.44 % 2.43 % 2.43 % Expenses after incentive fees (3)(4) 6.86 % 3.87 % 3.87 % 3.87 % 3.87 % 5.44 % 2.43 % 2.43 % Total return before incentive fees (2) -26.62 % -26.08 % -26.08 % -26.06 % -26.07 % 1.39 % 1.89 % 2.13 % Total return after incentive fees (2) -26.62 % -26.08 % -26.08 % -26.06 % -26.07 % 1.39 % 1.89 % 2.13 % 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 (2.73 ) (2.02 ) (2.51 ) (1.82 ) (1.24 ) (1.65 ) Net gain/(loss) on investments, net of non-controlling interests 17.19 20.67 25.33 18.50 22.46 29.23 Net income/(loss) 14.46 18.66 22.82 16.67 21.22 27.58 Net asset value, March 31, 2020 $ 145.97 $ 173.08 $ 215.64 $ 114.21 $ 135.37 $ 181.17 Ratios to average net assets Net investment income/(loss) -8.01 % -5.01 % -5.01 % -7.05 % -4.04 % -4.04 % Expenses before incentive fees (3)(4) 8.01 % 5.01 % 5.01 % 7.05 % 4.04 % 4.04 % Expenses after incentive fees (3)(4) 8.01 % 5.01 % 5.01 % 7.05 % 4.04 % 4.04 % Total return before incentive fees (2) 10.99 % 12.08 % 11.83 % 17.09 % 18.59 % 17.96 % Total return after incentive fees (2) 10.99 % 12.08 % 11.83 % 17.09 % 18.59 % 17.96 % (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]
Schedule of financial highlights of trust	2021 2020 Ratios to average net assets (1) Net investment income/(loss) (1) -6.20 % -5.77 % Expenses before incentive fees (3) (4) 6.06 % 5.84 % Expenses after incentive fees (3) (4) 6.26 % 5.84 % Total return before incentive fees (2) 6.45 % -15.26 % Total return after incentive fees (2) 4.56 % -15.26 % (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)	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Schedule of averages futures contracts	For the Three Months ended March 31, 2021 Monthly average contracts: Bought Sold Frontier Balanced Fund 788 787 For the Three Months ended March 31, 2020 Monthly average contracts: Bought Sold Frontier Balanced Fund 628 625
Schedule of realized trading revenue from futures, forwards and options	Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2021 Type of contract Frontier Fund Agriculturals $ 63,312 Currencies (27,812 ) Energies 34,820 Interest rates 106,786 Metals 23,335 Stock indices 171,118 Realized trading income/(loss) (1) $ 371,559 Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Frontier Fund Agriculturals $ 75,122 Currencies 106,325 Energies 35,710 Interest rates 88,571 Metals 313,738 Stock indices 22,768 Realized trading income/(loss) (1) $ 642,234 (1) Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.
Schedule of net trading gain loss	Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended March 31, 2021 Type of contract Frontier Fund Agriculturals $ 6,802 Currencies 17,052 Energies 16,600 Interest rates (76,782 ) Metals (15,723 ) Stock indices 4,716 Change in unrealized trading income/(loss) (1) $ (47,335 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Frontier Balanced Agriculturals $ 978 Currencies 21,386 Energies (1,845 ) Interest rates 4,169 Metals (43,253 ) Stock indices (7,154 ) Change in unrealized trading income/(loss) (1) $ (25,719 ) (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	As of March 31, 2021 Frontier Balanced Fund Gross Amounts of recognized Derivative Assets/ Gross Amounts offset in the Statements of Financial Condition Net Amounts Presented in the Statements of Financial Condition Open Trade Equity/(Deficit) $ 597,031 $ (543,924 ) $ 53,107 As of December 31, 2020 Frontier Balanced Fund Gross Amounts of recognized Derivative Assets Gross Amounts offset in the Statements of Financial Condition Net Amounts Presented in the Statements of Financial Condition Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440
Frontier Funds [Member]
Schedule of realized trading revenue from futures, forwards and options	Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2021 Type of contract Agriculturals $ 63,312 Currencies (27,812 ) Energies 34,820 Interest rates 106,786 Metals 23,335 Stock indices 171,119 Realized trading income/(loss) (1) $ 371,560 Realized Trading Revenue from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Agriculturals $ 75,122 Currencies 106,325 Energies 35,710 Interest rates 88,571 Metals 313,738 Stock indices 22,769 Realized trading income/(loss) (1) $ 642,235 (1) Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.
Schedule of net trading gain loss	Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended March 31, 2021 Type of contract Agriculturals $ 6,802 Currencies 17,052 Energies 16,600 Interest rates (76,782 ) Metals (15,723 ) Stock indices 4,716 Change in unrealized trading income/(loss) (1) $ (47,335 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Three Months Ended March 31, 2020 Type of contract Agriculturals $ 978 Currencies 21,386 Energies (1,845 ) Interest rates 4,169 Metals (43,253 ) Stock indices (7,154 ) Change in unrealized trading income/(loss) (1) $ (25,719 ) (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 Net Amounts Open Trade Equity/(Deficit) $ 597,031 $ (543,924 ) $ 53,107 As of December 31, 2020 Gross Gross Net Amounts Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440

Organization and Purpose (The S

Organization and Purpose (The Series of Frontier Funds) (Details) - The Series of the Frontier Funds [Member]	3 Months Ended
	Mar. 31, 2021
Organization and Purpose (Textual)
Managing owner contributions to the series of the trust percentage	1.00%
Aggregate initial and ongoing service fees	9.00%
Redemption fee percentage	10.00%
Minimum [Member]
Organization and Purpose (Textual)
Assets normally invested in one or more trading companies	30.00%
Maximum [Member]
Organization and Purpose (Textual)
Assets normally invested in one or more trading companies	70.00%
Class 1 or Class 1a [Member]
Organization and Purpose (Textual)
Amortized monthly annual rate percentage	2.00%
Service fee percentage	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 2 or Class 2a [Member]
Organization and Purpose (Textual)
Service fee percentage	0.50%
Percentage of NAV charged as a service fees	0.25%

Organization and Purpose (Front

Organization and Purpose (Frontier Funds) (Details) - Frontier Fund [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Organization and Purpose (Textual)
Managing owner contributions to the series of the trust percentage	1.00%
Percentage of assets invested in such trading company		100.00%
Aggregate initial and ongoing service fees	9.00%
Delaware statutory trust expire date	Dec. 31, 2053
Aggregate underwriting compensation percentage	10.00%	10.00%
Percentage of average daily NAV charged as a service fees	2.00%
Percentage of NAV charged as a service fees	3.00%
Minimum [Member]
Organization and Purpose (Textual)
Assets normally invested in one or more trading companies	30.00%
Maximum [Member]
Organization and Purpose (Textual)
Assets normally invested in one or more trading companies	70.00%
Class 1 or Class 1a [Member]
Organization and Purpose (Textual)
Service fee percentage	3.00%
Redemption fee percentage	2.00%
Amortized monthly annual rate	2.00%
Class 2 and Class 2a [Member]
Organization and Purpose (Textual)
Service fee percentage	0.50%
Service fee charged to limited owners	0.25%

Significant Accounting Polici_3

Significant Accounting Policies (The Series of Frontier Funds) (Details) - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Significant Accounting Policies (Textual)
Managing owner percentage	2.00%
Restricted cash	$ 308,895	$ 321,638
Gross income of the Trust constitutes qualifying income	90.00%
Incentive fees percentage	10.00%
Incentive fee, description	The Managing Owner is allowed to share in the incentive fees earned by the Commodity Trading Advisors up to 10% of New Net Profits (as defined in the prospectus). 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.
Redemption fee percentage	10.00%
Frontier Diversified Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	$ 22,629
Frontier Long/Short Commodity Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	296
Frontier Masters Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	31,725
Frontier Balanced Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	329,179
Frontier Select Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	17,777
Frontier Global Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	151,527
Frontier Heritage Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	$ 58,835
Class 1 or Class 1a [Member]
Significant Accounting Policies (Textual)
Amortized monthly annual rate percentage	2.00%
Service fee percentage	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 2 or Class 2a [Member]
Significant Accounting Policies (Textual)
Service fee percentage	0.50%
Percentage of NAV charged as a service fees	0.25%
Class 1AP, Class 2a and Class 3a [Member]
Significant Accounting Policies (Textual)
Aggregate interest income percentage	100.00%

Significant Accounting Polici_4

Significant Accounting Policies (Frontier Funds) (Details) - Frontier Fund [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Significant Accounting Policies (Textual)
Gross income of the Trust constitutes qualifying income	90.00%
Incentive fee, description	The Managing Owner is allowed to share in the incentive fees earned by the Commodity Trading Advisors up to 10% of New Net Profits (as defined in the prospectus). If the Managing Owner’s share of the incentive fee exceeds 10% of new net profits during the period, then the Managing Owner is obligated to return any amount in excess.
Subscriptions in advance	$ 647,505	$ 638,962
Class 1AP, Class 2a and Class 3a [Member]
Significant Accounting Policies (Textual)
Aggregate interest income from all sources, including assets held at clearing brokers is paid to the Managing Owner	100.00%
Class 1 or Class 1a [Member]
Significant Accounting Policies (Textual)
Service fee percentage	3.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	2.00%
Class 1 or Class 1a [Member] | Frontier Diversified Fund [Member]
Significant Accounting Policies (Textual)
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	2.00%
Class 1 or Class 1a [Member] | Frontier Masters Fund [Member]
Significant Accounting Policies (Textual)
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	2.00%
Class 1 or Class 1a [Member] | Frontier Long/Short Commodity Fund [Member]
Significant Accounting Policies (Textual)
Service fee percentage	2.00%
Amortized monthly annual rate	2.00%
Redemption fee percentage	2.00%
Class 1 or Class 1a [Member] | Frontier Balanced Fund [Member]
Significant Accounting Policies (Textual)
Service fee percentage	3.00%
Amortized monthly annual rate	3.00%
Redemption fee percentage	3.00%
Class 1 or Class 1a [Member] | Frontier Heritage Fund [Member]
Significant Accounting Policies (Textual)
Service fee percentage	3.00%
Amortized monthly annual rate	3.00%
Redemption fee percentage	3.00%
Class 1 or Class 1a [Member] | Frontier Select Fund [Member]
Significant Accounting Policies (Textual)
Service fee percentage	3.00%
Amortized monthly annual rate	3.00%
Redemption fee percentage	3.00%
Class 1 or Class 1a [Member] | Frontier Global Fund [Member]
Significant Accounting Policies (Textual)
Service fee percentage	3.00%
Amortized monthly annual rate	3.00%
Redemption fee percentage	3.00%
Class 2 and Class 2a [Member]
Significant Accounting Policies (Textual)
Service fee percentage	0.50%
Service fee charged to limited owners	0.25%
Frontier Trading Company I LLC [Member]
Significant Accounting Policies (Textual)
Restricted cash	$ 308,895	$ 321,638

Fair Value Measurements (The Se

Fair Value Measurements (The Series of Frontier Funds) (Details) - The Series of the Frontier Funds [Member] - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Frontier Diversified Fund [Member]
U.S. Treasury Securities	$ 121,604	$ 427,393
Frontier Diversified Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	23,731	16,669
U.S. Treasury Securities	121,604	427,393
Frontier Diversified Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	23,731	16,669
U.S. Treasury Securities	121,604	427,393
Frontier Diversified Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
Swap Contracts
U.S. Treasury Securities
Frontier Diversified Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Masters Fund [Member]
U.S. Treasury Securities	69,690	23,245
Frontier Masters Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	13,600	907
U.S. Treasury Securities	69,690	23,245
Frontier Masters Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	13,600	907
U.S. Treasury Securities	69,690	23,245
Frontier Masters Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Masters Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Long/Short Commodity Fund [Member]
U.S. Treasury Securities	79,922	454,738
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	15,597	17,736
U.S. Treasury Securities	79,922	454,738
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	15,597	17,736
U.S. Treasury Securities	79,922	454,738
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Balanced Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	33,854	49,755
Open Trade Equity (Deficit)	53,107	100,440
U.S. Treasury Securities	173,475	1,275,641
Frontier Balanced Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	33,854	49,755
Open Trade Equity (Deficit)	53,107	100,440
U.S. Treasury Securities	173,475	1,275,641
Frontier Balanced Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
Open Trade Equity (Deficit)
U.S. Treasury Securities
Frontier Balanced Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
Open Trade Equity (Deficit)
U.S. Treasury Securities
Frontier Select Fund [Member]
U.S. Treasury Securities	49,141
Frontier Select Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	9,590
U.S. Treasury Securities	49,141
Frontier Select Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	9,590
U.S. Treasury Securities	49,141
Frontier Select Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Select Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Global Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	27,774	1,083
U.S. Treasury Securities	142,316	27,742
Frontier Global Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	27,774	1,083
U.S. Treasury Securities	142,316	27,742
Frontier Global Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Global Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Heritage Fund [Member]
U.S. Treasury Securities	117,469	73,847
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	22,925	2,880
U.S. Treasury Securities	117,469	73,847
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	22,925	2,880
U.S. Treasury Securities	117,469	73,847
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
U.S. Treasury Securities

Fair Value Measurements (The _2

Fair Value Measurements (The Series of Frontier Funds) (Details 1) - The Series of the Frontier Funds [Member] - Level 3 Inputs [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
Frontier Balanced Fund [Member] | Swap [Member]
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]
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]
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]
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]
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 (The _3

Fair Value Measurements (The Series of Frontier Funds) (Details 2) - Swap Contracts [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
The Series of the Frontier Funds [Member] | Frontier Diversified Fund [Member]
Total change in unrealized appreciation (depreciation)	$ (1,537,399)
The Series of the Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
Total change in unrealized appreciation (depreciation)	44,277
The Series of the Frontier Funds [Member] | Frontier Balanced Fund [Member]
Total change in unrealized appreciation (depreciation)	(3,088,917)
The Series of the Frontier Funds [Member] | Frontier Heritage Fund [Member]
Total change in unrealized appreciation (depreciation)	197,829
Investments in Unconsolidated Trading Companies [Member] | Frontier Select Fund [Member]
Total change in unrealized appreciation (depreciation)	$ (91,989)

Fair Value Measurements (Fronti

Fair Value Measurements (Frontier Funds) (Details) - Fair Value, Measurements, Recurring [Member] - Frontier Funds [Member] - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Open Trade Equity (Deficit)	$ 53,107	$ 100,440
U.S. Treasury Securities	753,617	2,282,606
Level 1 Inputs [Member]
Open Trade Equity (Deficit)	53,107	100,440
U.S. Treasury Securities	753,617	2,282,606
Level 2 Inputs [Member]
Open Trade Equity (Deficit)
U.S. Treasury Securities
Level 3 Inputs [Member]
Open Trade Equity (Deficit)
U.S. Treasury Securities

Fair Value Measurements (Fron_2

Fair Value Measurements (Frontier Funds) (Details 1) - Level 3 Inputs [Member] - Frontier Funds [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
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

Fair Value Measurements (Fron_3

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

Swap Contracts (The Series of t

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

Swap Contracts (The Series of_2

Swap Contracts (The Series of the Frontier Funds) (Details Textual) - The Series of the Frontier Funds [Member] - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Swap Contracts (The Series of the Frontier Funds) (Textual)
Percentage of trust's assets were deposited with over-the-counter counterparties		0.00%
Cash holding shall be in excess amount	$ 250,000
Percentage of index exposure total	40.00%

Swap Contracts (Frontier Funds)

Swap Contracts (Frontier Funds) (Details) - Frontier Funds [Member] - Deutsche Bank AG [Member] - Swap [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
XXXIV Balanced Select Swap [Member]
Counterparty
Realized Gain/(Loss)	$ (2,448,166)
Change in Unrealized Gain/(Loss)	(3,088,917)
Fair Value	0
Advance on swap appreciation	0
XXXV Diversified Select Swap [Member]
Counterparty
Realized Gain/(Loss)	(446,306)
Change in Unrealized Gain/(Loss)	(1,537,399)
Fair Value	0
Advance on swap appreciation	0
XXXVII L/S Select Swap [Member]
Counterparty
Realized Gain/(Loss)	188,100
Change in Unrealized Gain/(Loss)	44,277
Fair Value	0
Advance on swap appreciation	0
Brevan Howard [Member]
Counterparty
Realized Gain/(Loss)	(189,734)
Change in Unrealized Gain/(Loss)	197,829
Fair Value	0
Advance on swap appreciation	$ 0

Swap Contracts (Frontier Fund_2

Swap Contracts (Frontier Funds) (Details Textual) - Frontier Funds [Member]	Mar. 31, 2021USD ($)
Swaps Contracts (Textual)
Cash holding shall be in excess amount	$ 250,000
Percentage of index exposure total	40.00%

Investments in Unconsolidated_3

Investments in Unconsolidated Trading Companies and Private Investment Companies (The Series of Frontier Funds) (Details) - The Series of the Frontier Funds [Member] - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Frontier Diversified Fund [Member]
Fair Value	$ 23,731	$ 16,669
Frontier Diversified Fund [Member] | Frontier Trading XXXVIII, LLC [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.59%	0.40%
Fair Value	$ 23,731	$ 16,669
Frontier Masters Fund [Member]
Fair Value	$ 13,600	$ 907
Frontier Masters Fund [Member] | Frontier Trading XXXVIII, LLC [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	1.37%	0.09%
Fair Value	$ 13,600	$ 907
Frontier Long/Short Commodity Fund [Member]
Fair Value	$ 15,597	$ 17,736
Frontier Long/Short Commodity Fund [Member] | Frontier Trading Company XXXVIII [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	1.16%	1.35%
Fair Value	$ 15,597	$ 17,736
Frontier Balanced Fund [Member] | Frontier Trading XXXVIII, LLC [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.30%	0.41%
Fair Value	$ 33,854	$ 49,755
Frontier Select Fund [Member]
Fair Value	$ 9,590
Frontier Select Fund [Member] | Frontier Trading Companies XXXVIII and XXXIX [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.60%	0.00%
Fair Value	$ 9,590	$ 0
Frontier Global Fund (formerly Frontier Winton Fund) [Member]
Fair Value	$ 27,774	$ 1,083
Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Frontier Trading XXXVIII, LLC [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.96%	0.04%
Fair Value	$ 27,774	$ 1,083
Frontier Heritage Fund [Member]
Fair Value	$ 22,925	$ 2,880
Frontier Heritage Fund [Member] | Frontier Trading XXXVIII, LLC [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	0.93%	0.12%
Fair Value	$ 22,925	$ 2,880

Investments in Unconsolidated_4

Investments in Unconsolidated Trading Companies and Private Investment Companies (The Series of the Frontier Funds) (Details 1) - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Frontier Balanced Fund [Member]
Trading Commissions	$ (27,999)
Realized Gain/(Loss)	232,237	(93,600)
Change in Unrealized Gain/(Loss)	215,358	(116,994)
Net Income (Loss)	419,596	(210,594)
Frontier Balanced Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	(15,154)	(23,301)
Net Income (Loss)	(15,154)	(23,301)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Trading Commissions	(1,608)
Realized Gain/(Loss)	105,068	101,444
Change in Unrealized Gain/(Loss)	4,403	260,300
Net Income (Loss)	107,863	361,744
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		(6,308)
Change in Unrealized Gain/(Loss)		(41,608)
Net Income (Loss)		(47,916)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		(310,754)
Change in Unrealized Gain/(Loss)		(332,663)
Net Income (Loss)		(643,417)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Trading Commissions	(6,767)
Realized Gain/(Loss)	96,963	78,918
Change in Unrealized Gain/(Loss)	(211,079)	(356,986)
Net Income (Loss)	(120,883)	(278,068)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		7,506
Change in Unrealized Gain/(Loss)		(259,157)
Net Income (Loss)		(251,651)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Trading Commissions	(2,499)
Realized Gain/(Loss)	(183,383)	25,548
Change in Unrealized Gain/(Loss)	7,536	(298,885)
Net Income (Loss)	(178,346)	(273,337)
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Trading Commissions	(4,323)
Realized Gain/(Loss)	49,066	(23,195)
Change in Unrealized Gain/(Loss)	109,995	166,919
Net Income (Loss)	154,738	143,724
Frontier Balanced Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Trading Commissions	(11,862)
Realized Gain/(Loss)	665,706	33,241
Change in Unrealized Gain/(Loss)	(74,945)	768,387
Net Income (Loss)	578,899	801,628
Frontier Balanced Fund [Member] | JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Trading Commissions	(940)
Realized Gain/(Loss)	(501,183)
Change in Unrealized Gain/(Loss)	394,602
Net Income (Loss)	(107,521)
Frontier Global Fund
Trading Commissions	(2,508)
Realized Gain/(Loss)	172,894	309,658
Change in Unrealized Gain/(Loss)	(26,636)	244,045
Net Income (Loss)	143,750	553,703
Frontier Global Fund | Frontier Trading Company XXXVIII, LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	13,872	(5,077)
Net Income (Loss)	13,872	(5,077)
Frontier Global Fund | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Trading Commissions	(2,508)
Realized Gain/(Loss)	172,894	309,658
Change in Unrealized Gain/(Loss)	(40,508)	249,122
Net Income (Loss)	129,878	558,780
Frontier Select Fund [Member]
Trading Commissions	(3,889)
Realized Gain/(Loss)	(16,590)	7,923
Change in Unrealized Gain/(Loss)	152,320	(29,481)
Net Income (Loss)	131,841	(21,558)
Frontier Select Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	7,331	(6,529)
Net Income (Loss)	7,331	(6,529)
Frontier Select Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Trading Commissions	(3,497)
Realized Gain/(Loss)	198,489	24,954
Change in Unrealized Gain/(Loss)	(21,583)	236,122
Net Income (Loss)	173,409	261,076
Frontier Select Fund [Member] | JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Trading Commissions	(392)
Realized Gain/(Loss)	(215,079)
Change in Unrealized Gain/(Loss)	166,572
Net Income (Loss)	(48,899)
Frontier Select Fund [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		(17,031)
Change in Unrealized Gain/(Loss)		(259,074)
Net Income (Loss)		(276,105)
Frontier Heritage Fund [Member]
Trading Commissions	(4,464)
Realized Gain/(Loss)	273,562	4,371
Change in Unrealized Gain/(Loss)	(41,978)	410,011
Net Income (Loss)	227,120	414,382
Frontier Heritage Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	10,944	(6,103)
Net Income (Loss)	10,944	(6,103)
Frontier Heritage Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Trading Commissions	(1,340)
Realized Gain/(Loss)	93,684	33,962
Change in Unrealized Gain/(Loss)	(29,457)	142,571
Net Income (Loss)	62,887	176,533
Frontier Heritage Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Trading Commissions	(3,124)
Realized Gain/(Loss)	179,878	(29,591)
Change in Unrealized Gain/(Loss)	(23,465)	273,543
Net Income (Loss)	153,289	243,952
Frontier Long/Short Commodity Fund [Member]
Trading Commissions	(3,898)
Realized Gain/(Loss)	129,264	(67,371)
Change in Unrealized Gain/(Loss)	(49,641)	(64,547)
Net Income (Loss)	75,725	(131,918)
Frontier Long/Short Commodity Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	10,147	(4,706)
Net Income (Loss)	10,147	(4,706)
Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		(61,736)
Change in Unrealized Gain/(Loss)		(33,649)
Net Income (Loss)		(95,385)
Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Trading Commissions	(229)
Realized Gain/(Loss)	23,549	820
Change in Unrealized Gain/(Loss)	(18,336)	(137,741)
Net Income (Loss)	4,984	(136,921)
Frontier Long/Short Commodity Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Trading Commissions	(1,861)
Realized Gain/(Loss)	105,715	(6,455)
Change in Unrealized Gain/(Loss)	(12,892)	111,549
Net Income (Loss)	90,962	105,094
Frontier Long/Short Commodity Fund [Member] | Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Trading Commissions	(1,808)
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	(28,560)
Net Income (Loss)	(30,368)
Frontier Diversified Fund [Member]
Trading Commissions	(9,617)
Realized Gain/(Loss)	77,107	(149,796)
Change in Unrealized Gain/(Loss)	88,310	114,277
Net Income (Loss)	155,800	(35,519)
Frontier Diversified Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	8,063	(1,009)
Net Income (Loss)	8,063	(1,009)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Trading Commissions	(753)
Realized Gain/(Loss)	52,525	88,315
Change in Unrealized Gain/(Loss)	(1,159)	152,312
Net Income (Loss)	50,613	240,627
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		(10,522)
Change in Unrealized Gain/(Loss)		(20,678)
Net Income (Loss)		(31,200)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		(268,381)
Change in Unrealized Gain/(Loss)		(144,944)
Net Income (Loss)		(413,325)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Trading Commissions	(3,231)
Realized Gain/(Loss)	47,548	109,016
Change in Unrealized Gain/(Loss)	(95,237)	(298,106)
Net Income (Loss)	(50,920)	(189,090)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		3,721
Change in Unrealized Gain/(Loss)		(159,251)
Net Income (Loss)		(155,530)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Trading Commissions	(640)
Realized Gain/(Loss)	(46,172)	(53,371)
Change in Unrealized Gain/(Loss)	(2,167)	(32,636)
Net Income (Loss)	(48,979)	(86,007)
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Trading Commissions	(2,763)
Realized Gain/(Loss)	30,374	(12,007)
Change in Unrealized Gain/(Loss)	90,227	134,066
Net Income (Loss)	117,838	122,059
Frontier Diversified Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Trading Commissions	(2,011)
Realized Gain/(Loss)	110,869	(6,567)
Change in Unrealized Gain/(Loss)	(5,456)	484,523
Net Income (Loss)	103,402	477,956
Frontier Diversified Fund [Member] | JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Trading Commissions	(219)
Realized Gain/(Loss)	(118,037)
Change in Unrealized Gain/(Loss)	94,039
Net Income (Loss)	(24,217)
Frontier Masters Fund [Member]
Trading Commissions	(1,571)
Realized Gain/(Loss)	440	(235,137)
Change in Unrealized Gain/(Loss)	59,662	240,212
Net Income (Loss)	58,531	5,075
Frontier Masters Fund [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)	11,507	(6,482)
Net Income (Loss)	11,507	(6,482)
Frontier Masters Fund [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Trading Commissions	(353)
Realized Gain/(Loss)	23,632	28,637
Change in Unrealized Gain/(Loss)	(5,892)	104,600
Net Income (Loss)	17,387	133,237
Frontier Masters Fund [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		(248,608)
Change in Unrealized Gain/(Loss)		88,339
Net Income (Loss)		(160,269)
Frontier Masters Fund [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Trading Commissions	(1,062)
Realized Gain/(Loss)	60,348	(21,114)
Change in Unrealized Gain/(Loss)	(7,732)	156,235
Net Income (Loss)	51,554	135,121
Frontier Masters Fund [Member] | JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Trading Commissions	(156)
Realized Gain/(Loss)	(83,540)
Change in Unrealized Gain/(Loss)	61,779
Net Income (Loss)	(21,917)
Frontier Masters Fund [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Trading Commissions
Realized Gain/(Loss)		5,948
Change in Unrealized Gain/(Loss)		(102,480)
Net Income (Loss)		(96,532)
Frontier Masters Fund [Member] | Galaxy Plus Fund - Chesapeake Feeder Fund (518) LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)
Net Income (Loss)
Frontier Masters Fund [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Trading Commissions
Realized Gain/(Loss)
Change in Unrealized Gain/(Loss)
Net Income (Loss)

Investments in Unconsolidated_5

Investments in Unconsolidated Trading Companies and Private Investment Companies (The Series of Frontier Funds) (Details 2) - The Series of the Frontier Funds [Member]	3 Months Ended
	Mar. 31, 2021
Frontier Diversified Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Diversified Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Diversified Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Diversified Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Diversified Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Diversified Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Masters Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Masters Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Masters Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Weekly
Liquidity Restrictions	None
Frontier Long/Short Commodity Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Balanced Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Balanced Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Balanced Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Balanced Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Balanced Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Balanced Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Select Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Select Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Global Fund | Trend Following [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Heritage Fund [Member] | Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Frontier Heritage Fund [Member] | Trend Following [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None

Investments in Private Investme

Investments in Private Investment Companies (Frontier Funds) (Details 1) - Frontier Funds [Member]	3 Months Ended
	Mar. 31, 2021
Multi-Strategy [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Multi-Strategy [Member] | Volt Diversified Alpha Feeder Fund (550) LLC) [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None
Trend Following [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Redemptions Notice Period	24 hours
Redemptions Permitted	Daily
Liquidity Restrictions	None

Transactions with Affiliates _2

Transactions with Affiliates (The Series of Frontier Funds) (Details) - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Frontier Diversified Fund [Member]
Management Fee
Service Fee	1,049	7,707
Trading Fee	34,937	103,933
Frontier Masters Fund [Member]
Management Fee
Service Fee	210	595
Trading Fee	14,863	33,055
Frontier Long/Short Commodity Fund [Member]
Management Fee
Service Fee	54	111
Trading Fee	8,765	9,640
Frontier Balanced Fund [Member]
Incentive (Rebate) Fees	49,840
Management Fee	4,619	5,020
Service Fee	67,267	125,308
Trading Fee	114,439	198,985
Frontier Select Fund [Member]
Incentive (Rebate) Fees
Management Fee
Service Fee	11,438	20,160
Trading Fee	11,355	16,955
Frontier Global Fund [Member]
Management Fee
Service Fee	19,938	30,441
Trading Fee	35,130	55,555
Frontier Heritage Fund [Member]
Management Fee
Service Fee	16,157	18,013
Trading Fee	$ 23,676	$ 29,905

Transactions with Affiliates _3

Transactions with Affiliates (The Series of Frontier Funds) (Details 1) - The Series of the Frontier Funds [Member] - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Frontier Diversified Fund [Member]
Incentive Fees
Management Fees
Interest Fees
Service Fees	365	385
Trading Fees	12,341	12,576
Frontier Masters Fund [Member]
Incentive Fees
Management Fees
Interest Fees
Service Fees	74	70
Trading Fees	5,235	5,460
Frontier Long/Short Commodity Fund [Member]
Incentive Fees
Management Fees
Interest Fees	53	87
Service Fees		18
Trading Fees	3,174	2,281
Frontier Balanced Fund [Member]
Incentive Fees	49,840
Management Fees	1,629	8,854
Interest Fees		1,376
Service Fees	20,826	21,381
Trading Fees	38,152	37,894
Frontier Select Fund [Member]
Incentive Fees
Management Fees
Interest Fees	359	179
Service Fees	3,803	3,709
Trading Fees	3,915	3,933
Frontier Global Fund [Member]
Incentive Fees
Management Fees
Interest Fees	499	326
Service Fees	6,559	6,348
Trading Fees	12,310	11,849
Frontier Heritage Fund [Member]
Incentive Fees
Management Fees
Interest Fees	563	139
Service Fees	5,169	4,794
Trading Fees	$ 8,360	$ 7,705

Transactions with Affiliates _4

Transactions with Affiliates (The Series of Frontier Funds) (Details 2) - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Managing Owner [Member]
Gross Amount Paid to the Managing Owner	$ 4,145	$ 5,872
Frontier Diversified Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Diversified Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Diversified Fund [Member] | Class 3 [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Masters Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Masters Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Masters Fund [Member] | Class 3 [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 8	$ 5
Ratio to Average Net Assets	0.02%	0.01%
Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
Gross Amount Paid to the Managing Owner	$ 226	$ 114
Ratio to Average Net Assets	0.02%	1.00%
Frontier Long/Short Commodity Fund [Member] | Class 1a [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Long/Short Commodity Fund [Member] | Class 2a [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Long/Short Commodity Fund [Member] | Class 3a [Member]
Gross Amount Paid to the Managing Owner
Ratio to Average Net Assets	0.00%	0.00%
Frontier Balanced Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 301	$ 2,221
Ratio to Average Net Assets	0.00%	0.01%
Frontier Balanced Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 69	$ 425
Ratio to Average Net Assets	0.00%	0.01%
Frontier Balanced Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner	$ 3	$ 31
Ratio to Average Net Assets	0.00%	0.01%
Frontier Balanced Fund [Member] | Class 2a [Member]
Gross Amount Paid to the Managing Owner	$ 1	$ 5
Ratio to Average Net Assets	0.00%	0.00%
Frontier Balanced Fund [Member] | Class 3a [Member]
Gross Amount Paid to the Managing Owner	$ 3	$ 23
Ratio to Average Net Assets	0.00%	0.00%
Frontier Select Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 790	$ 779
Ratio to Average Net Assets	0.05%	0.03%
Frontier Select Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 35	$ 26
Ratio to Average Net Assets	0.05%	0.03%
Frontier Select Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner	$ 5	$ 3
Ratio to Average Net Assets	0.05%	0.03%
Frontier Global Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 1,455	$ 1,217
Ratio to Average Net Assets	0.05%	3.00%
Frontier Global Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 103	$ 111
Ratio to Average Net Assets	0.05%	0.03%
Frontier Global Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner		$ 11
Ratio to Average Net Assets	0.00%	0.03%
Frontier Heritage Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 1,038	$ 728
Ratio to Average Net Assets	0.05%	0.03%
Frontier Heritage Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 104	$ 170
Ratio to Average Net Assets	0.05%	0.03%
Frontier Heritage Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner	$ 4	$ 3
Ratio to Average Net Assets	0.05%	0.03%

Transactions with Affiliates _5

Transactions with Affiliates (The Series of Frontier Funds) (Details Textual) - The Series of the Frontier Funds [Member] - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Transactions with Affiliates (Textual)
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 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.
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 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 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.
Prepaid initial service fees		$ 0
Frontier Balanced Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee	$ 352,411
Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee	411
Frontier Diversified Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee	22,650
Frontier Masters Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee	31,725
Frontier Global Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee	155,675
Frontier Select Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee	19,904
Frontier Heritage Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee	$ 64,729
Managing Owner [Member]
Transactions with Affiliates (Textual)
Percentage of minimum purchase commitment	1.00%
Percentage of contributes funds to trust	1.00%
Percentage of interest in specific series of trust	1.00%
Managing Owner [Member] | Frontier Balanced Fund [Member]
Transactions with Affiliates (Textual)
Percentage of FCM fee	2.25%
Managing Owner [Member] | Frontier Balanced Fund [Member] | Swap [Member]
Transactions with Affiliates (Textual)
Percentage of management fee		1.00%
Managing Owner [Member] | Frontier Balanced Fund [Member] | Class 1AP
Transactions with Affiliates (Textual)
Percentage of interest	1.00%
Percentage of management fee	0.50%
Managing Owner [Member] | Frontier Balanced Fund [Member] | Class 2a [Member]
Transactions with Affiliates (Textual)
Percentage of interest	1.00%
Percentage of management fee	0.50%
Managing Owner [Member] | Frontier Balanced Fund [Member] | Class 2 [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	0.50%
Managing Owner [Member] | Frontier Balanced Fund [Member] | Class 1 [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	0.50%
Managing Owner [Member] | Frontier Balanced Fund [Member] | Class 3a [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	0.50%
Managing Owner [Member] | Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Textual)
Percentage of interest	1.00%
Percentage of FCM fee	2.25%
Managing Owner [Member] | Frontier Long/Short Commodity Fund [Member] | Swap [Member]
Transactions with Affiliates (Textual)
Percentage of management fee		1.50%
Managing Owner [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2a [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	2.00%
Managing Owner [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	3.50%
Managing Owner [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	3.50%
Managing Owner [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3a [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	2.00%
Managing Owner [Member] | Frontier Long/Short Commodity Fund [Member] | Class 1a [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	2.00%
Managing Owner [Member] | Frontier Diversified Fund [Member]
Transactions with Affiliates (Textual)
Percentage of interest	1.00%
Percentage of management fee	0.75%
Percentage of FCM fee	2.25%
Managing Owner [Member] | Frontier Diversified Fund [Member] | Swap [Member]
Transactions with Affiliates (Textual)
Percentage of management fee		1.00%
Managing Owner [Member] | Frontier Masters Fund [Member]
Transactions with Affiliates (Textual)
Percentage of interest	1.00%
Percentage of management fee	2.00%
Percentage of FCM fee	2.25%
Managing Owner [Member] | Frontier Global Fund [Member]
Transactions with Affiliates (Textual)
Percentage of management fee		2.00%
Percentage of FCM fee	2.25%
Managing Owner [Member] | Frontier Select Fund [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	2.50%
Percentage of FCM fee	2.25%
Managing Owner [Member] | Frontier Select Fund [Member] | Swap [Member]
Transactions with Affiliates (Textual)
Percentage of management fee		1.00%
Managing Owner [Member] | Frontier Heritage Fund [Member] | Swap [Member]
Transactions with Affiliates (Textual)
Percentage of management fee		1.00%
Managing Owner [Member] | Frontier Heritage Fund [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	2.50%
Percentage of FCM fee	2.25%

Transactions with Affiliates (F

Transactions with Affiliates (Frontier Funds) (Details) - Managing Owner [Member] - Frontier Funds [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2018
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of contributes funds to trust	1.00%
Percentage of minimum purchase commitment	1.00%
Percentage of interest in specific series of trust	1.00%
Trust had payable for incentive fees	$ 49,840		$ 0	$ 10,897
Trust had payable for management fees	1,629		8,854	78,045
Trust had payable for interest fees	1,474		2,107	10,852
Trust had payable for service fees	83,487		36,705	96,152
Trust had payable for trading fees	83,487		$ 81,698	$ 222,241
Trust paid for incentive fees	0	$ 49,840
Trust paid for management fees	5,020	4,619
Trust paid for service fees	202,335	116,113
Trust paid for trading fees	448,028	243,165
Trust paid	$ 4,145	$ 5,872
Description of interest income	For the Frontier Diversified Fund, Frontier Long/Short Commodity Fund (For the three months ended March 31, 2021, and 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.
Class 1 [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of service fee	3.00%
Class 1a Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of service fee	3.00%
Class 2 Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of service fee	2.25%
Frontier Balanced Fund [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of FCM fee	2.25%
Percentage of series NAV	0.12%
Percentage of incentive fee	25.00%
Frontier Balanced Fund [Member] | Swap [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee			1.00%
Frontier Balanced Fund [Member] | Swap [Member] | Maximum [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of incentive fee			25.00%
Frontier Balanced Fund [Member] | Swap [Member] | Minimum [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of incentive fee			20.00%
Frontier Balanced Fund [Member] | Class 1AP Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Balanced Fund [Member] | Class 2a Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Balanced Fund [Member] | Class 1 and Class 2 [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	0.50%
Percentage of aggregate interest income	2.00%
Frontier Balanced Fund [Member] | Class 1AP, Class 2a and Class 3a [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	1.00%
Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of FCM fee	2.25%
Percentage of series NAV	0.12%
Percentage of incentive fee	20.00%
Frontier Long/Short Commodity Fund [Member] | Swap [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee			1.50%
Percentage of incentive fee			25.00%
Frontier Long/Short Commodity Fund [Member] | Class 1AP Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Long/Short Commodity Fund [Member] | Class 2a Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Long/Short Commodity Fund [Member] | Class 1a, Class 2a and Class 3a [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	2.00%
Frontier Long/Short Commodity Fund [Member] | Class 2 and Class 3 [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	3.50%
Percentage of aggregate interest income	2.00%
Frontier Diversified Fund [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	0.75%
Percentage of FCM fee	2.25%
Percentage of series NAV	0.12%
Percentage of incentive fee	25.00%
Frontier Diversified Fund [Member] | Swap [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee			1.00%
Frontier Diversified Fund [Member] | Swap [Member] | Maximum [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of incentive fee			25.00%
Frontier Diversified Fund [Member] | Swap [Member] | Minimum [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of incentive fee			20.00%
Frontier Diversified Fund [Member] | Class 1AP Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Diversified Fund [Member] | Class 2a Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Masters Fund [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	2.00%
Percentage of FCM fee	2.25%
Percentage of series NAV	0.12%
Percentage of incentive fee	20.00%
Frontier Masters Fund [Member] | Class 1AP Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Masters Fund [Member] | Class 2a Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of interest	1.00%
Frontier Global Fund (formerly Frontier Winton Fund) [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	2.00%
Percentage of FCM fee	2.25%
Percentage of series NAV	0.12%
Percentage of incentive fee	20.00%
Percentage of aggregate interest income	2.00%
Frontier Heritage Fund [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	2.50%
Percentage of FCM fee	2.25%
Percentage of series NAV	0.12%
Percentage of incentive fee	20.00%
Percentage of aggregate interest income	2.00%
Frontier Heritage Fund [Member] | Swap [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee			1.00%
Percentage of incentive fee			15.00%
Frontier Select Fund [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	2.50%
Percentage of FCM fee	2.25%
Percentage of series NAV	0.12%
Percentage of incentive fee	20.00%
Percentage of aggregate interest income	2.00%

Financial Highlights (The Serie

Financial Highlights (The Series of the Frontier Funds) (Details) - Series of Frontier Funds [Member] - $ / shares		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Frontier Diversified Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 72.68	$ 101.1
Net operating results:
Interest income	[1]	0.03	0
Expenses	[1]	(1.14)	(1.77)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.05	(20.18)
Net income/(loss)	[1]	1.94	(21.95)
Net asset value	[1]	$ 74.62	$ 79.15
Ratios to average net assets
Net investment income/(loss)		(6.16%)	(7.11%)
Expenses before incentive fees	[2],[3]	6.31%	7.11%
Expenses after incentive fees	[2],[3]	6.31%	7.11%
Total return before incentive fees	[4]	2.67%	(21.71%)
Total return after incentive fees	[4]	2.67%	(21.71%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Diversified Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 88.95	$ 121.58
Net operating results:
Interest income	[1]	0.03	0
Expenses	[1]	(0.80)	(1.11)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.53	(24.87)
Net income/(loss)	[1]	2.76	(25.98)
Net asset value	[1]	$ 91.71	$ 95.6
Ratios to average net assets
Net investment income/(loss)		(3.43%)	(3.68%)
Expenses before incentive fees	[2],[3]	3.59%	3.68%
Expenses after incentive fees	[2],[3]	3.59%	3.68%
Total return before incentive fees	[4]	3.11%	(21.37%)
Total return after incentive fees	[4]	3.11%	(21.37%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Diversified Fund [Member] | Class 3 [Member]
Net asset value	[1]	$ 83.33	$ 113.61
Net operating results:
Interest income	[1]	0.03	0
Expenses	[1]	(0.75)	(1.02)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.35	(23.20)
Net income/(loss)	[1]	2.64	(24.22)
Net asset value	[1]	$ 85.97	$ 89.39
Ratios to average net assets
Net investment income/(loss)		(3.43%)	(3.68%)
Expenses before incentive fees	[2],[3]	3.59%	3.68%
Expenses after incentive fees	[2],[3]	3.59%	3.68%
Total return before incentive fees	[4]	3.16%	(21.32%)
Total return after incentive fees	[4]	3.16%	(21.32%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Masters Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 55.18	$ 72.28
Net operating results:
Interest income	[1]	0.05	0.03
Expenses	[1]	(2.05)	(4.46)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.26	3.49
Net income/(loss)	[1]	2.26	(0.95)
Net asset value	[1]	$ 57.44	$ 71.34
Ratios to average net assets
Net investment income/(loss)		(14.43%)	(24.52%)
Expenses before incentive fees	[2],[3]	14.78%	0.247%
Expenses after incentive fees	[2],[3]	14.78%	24.70%
Total return before incentive fees	[4]	4.10%	(1.31%)
Total return after incentive fees	[4]	4.10%	(1.31%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Masters Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 67.54	$ 87.18
Net operating results:
Interest income	[1]	0.06	0.04
Expenses	[1]	(1.05)	(1.32)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.07	0.27
Net income/(loss)	[1]	3.07	(1.01)
Net asset value	[1]	$ 70.61	$ 86.18
Ratios to average net assets
Net investment income/(loss)		(5.85%)	(5.87%)
Expenses before incentive fees	[2],[3]	6.20%	6.05%
Expenses after incentive fees	[2],[3]	6.20%	6.05%
Total return before incentive fees	[4]	4.55%	(1.15%)
Total return after incentive fees	[4]	4.55%	(1.15%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Masters Fund [Member] | Class 3 [Member]
Net asset value	[1]	$ 63.52	$ 81.78
Net operating results:
Interest income	[1]	0.06	0.04
Expenses	[1]	(0.99)	(1.24)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.86	0.31
Net income/(loss)	[1]	2.93	(0.89)
Net asset value	[1]	$ 66.45	$ 80.89
Ratios to average net assets
Net investment income/(loss)		(5.85%)	(5.87%)
Expenses before incentive fees	[2],[3]	6.20%	6.05%
Expenses after incentive fees	[2],[3]	6.20%	6.05%
Total return before incentive fees	[4]	4.61%	(1.09%)
Total return after incentive fees	[4]	4.61%	(1.09%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 85.99	$ 81.6
Net operating results:
Interest income	[1]	0.09	0.04
Expenses	[1]	(0.59)	(0.59)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.91	7.61
Net income/(loss)	[1]	4.4	7.06
Net asset value	[1]	$ 90.39	$ 88.66
Ratios to average net assets
Net investment income/(loss)		(2.26%)	(2.64%)
Expenses before incentive fees	[2],[3]	2.65%	2.83%
Expenses after incentive fees	[2],[3]	2.65%	2.83%
Total return before incentive fees	[4]	5.12%	8.65%
Total return after incentive fees	[4]	5.12%	8.65%
Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
Net asset value	[1]	$ 90.21	$ 85.64
Net operating results:
Interest income	[1]	0.09	0.04
Expenses	[1]	(0.62)	(0.62)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.15	7.94
Net income/(loss)	[1]	4.61	7.36
Net asset value	[1]	$ 94.82	$ 93.01
Ratios to average net assets
Net investment income/(loss)		(2.26%)	(2.64%)
Expenses before incentive fees	[2],[3]	2.65%	2.83%
Expenses after incentive fees	[2],[3]	2.65%	2.83%
Total return before incentive fees	[4]	5.11%	8.60%
Total return after incentive fees	[4]	5.11%	8.60%
Frontier Long/Short Commodity Fund [Member] | Class 2a [Member]
Net asset value	[1]	$ 55.29	$ 52.55
Net operating results:
Interest income	[1]	0.06	0.03
Expenses	[1]	(0.38)	(0.38)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.51	4.77
Net income/(loss)	[1]	3.2	4.42
Net asset value	[1]	$ 58.49	$ 56.98
Ratios to average net assets
Net investment income/(loss)		(2.26%)	(2.64%)
Expenses before incentive fees	[2],[3]	2.65%	2.83%
Expenses after incentive fees	[2],[3]	2.65%	2.83%
Total return before incentive fees	[4]	5.79%	8.40%
Total return after incentive fees	[4]	5.79%	8.40%
Frontier Long/Short Commodity Fund [Member] | Class 3a [Member]
Net asset value	[1]	$ 58.37	$ 55.31
Net operating results:
Interest income	[1]	0.06	0.03
Expenses	[1]	(0.40)	(0.40)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.74	5.08
Net income/(loss)	[1]	3.4	4.71
Net asset value	[1]	$ 61.77	$ 60.02
Ratios to average net assets
Net investment income/(loss)		(2.26%)	(2.64%)
Expenses before incentive fees	[2],[3]	2.65%	2.83%
Expenses after incentive fees	[2],[3]	2.65%	2.83%
Total return before incentive fees	[4]	5.82%	8.52%
Total return after incentive fees	[4]	5.82%	8.52%
Frontier Long/Short Commodity Fund [Member] | Class 1a [Member]
Net asset value	[1]		$ 44.2
Net operating results:
Interest income	[1]		0.02
Expenses	[1]		(0.75)
Net gain/(loss) on investments, net of non-controlling interests	[1]		4.21
Net income/(loss)	[1]		3.49
Net asset value	[1]		$ 47.69
Ratios to average net assets
Net investment income/(loss)			(6.43%)
Expenses before incentive fees	[2],[3]		6.62%
Expenses after incentive fees	[2],[3]		6.62%
Total return before incentive fees	[4]		7.89%
Total return after incentive fees	[4]		7.89%
Frontier Balanced Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 79.93	$ 117.23
Net operating results:
Interest income	[1]	0	0.03
Expenses	[1]	(1.78)	(1.94)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.24	(29.31)
Net income/(loss)	[1]	3.46	(31.21)
Net asset value	[1]	$ 83.39	$ 86.02
Ratios to average net assets
Net investment income/(loss)		(7.61%)	(6.74%)
Expenses before incentive fees	[2],[3]	7.18%	6.86%
Expenses after incentive fees	[2],[3]	7.61%	6.86%
Total return before incentive fees	[4]	4.76%	(26.62%)
Total return after incentive fees	[4]	4.32%	(26.62%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Balanced Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 130.54	$ 185.82
Net operating results:
Interest income	[1]	0	0.05
Expenses	[1]	(1.94)	(1.73)
Net gain/(loss) on investments, net of non-controlling interests	[1]	8.61	(46.77)
Net income/(loss)	[1]	6.67	(48.45)
Net asset value	[1]	$ 137.21	$ 137.37
Ratios to average net assets
Net investment income/(loss)		(4.63%)	(3.75%)
Expenses before incentive fees	[2],[3]	4.19%	3.87%
Expenses after incentive fees	[2],[3]	4.63%	3.87%
Total return before incentive fees	[4]	5.54%	(26.08%)
Total return after incentive fees	[4]	5.11%	(26.08%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Balanced Fund [Member] | Class 2a [Member]
Net asset value	[1]	$ 113.2	$ 161.04
Net operating results:
Interest income	[1]	0	0.05
Expenses	[1]	(1.69)	(1.50)
Net gain/(loss) on investments, net of non-controlling interests	[1]	7.47	(40.51)
Net income/(loss)	[1]	5.78	(41.97)
Net asset value	[1]	$ 118.98	$ 119.07
Ratios to average net assets
Net investment income/(loss)		(4.63%)	(3.75%)
Expenses before incentive fees	[2],[3]	4.19%	3.87%
Expenses after incentive fees	[2],[3]	4.63%	3.87%
Total return before incentive fees	[4]	5.54%	(26.06%)
Total return after incentive fees	[4]	5.11%	(2606.50%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Balanced Fund [Member] | Class 3a [Member]
Net asset value	[1]	$ 112.81	$ 160.5
Net operating results:
Interest income	[1]	0	0.05
Expenses	[1]	(1.68)	(1.50)
Net gain/(loss) on investments, net of non-controlling interests	[1]	7.45	(40.39)
Net income/(loss)	[1]	5.77	(41.84)
Net asset value	[1]	$ 118.58	$ 118.66
Ratios to average net assets
Net investment income/(loss)		(4.63%)	(3.75%)
Expenses before incentive fees	[2],[3]	4.19%	3.87%
Expenses after incentive fees	[2],[3]	4.63%	3.87%
Total return before incentive fees	[4]	5.54%	(26.07%)
Total return after incentive fees	[4]	5.11%	(26.07%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Balanced Fund [Member] | Class 1AP [Member]
Net asset value	[1]	$ 96.81	$ 137.81
Net operating results:
Interest income	[1]	0	0.04
Expenses	[1]	(1.44)	(1.29)
Net gain/(loss) on investments, net of non-controlling interests	[1]	6.38	(34.70)
Net income/(loss)	[1]	4.94	(35.94)
Net asset value	[1]	$ 101.75	$ 101.87
Ratios to average net assets
Net investment income/(loss)		(4.63%)	(3.75%)
Expenses before incentive fees	[2],[3]	4.19%	3.87%
Expenses after incentive fees	[2],[3]	4.63%	3.87%
Total return before incentive fees	[4]	5.53%	(26.08%)
Total return after incentive fees	[4]	5.10%	(26.08%)
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Select Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 58.55	$ 66.56
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(0.86)	(0.93)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.87	1.85
Net income/(loss)	[1]	4.01	0.92
Net asset value	[1]	$ 62.56	$ 67.48
Ratios to average net assets
Net investment income/(loss)		(5.80%)	(5.44%)
Expenses before incentive fees	[2],[3]	5.80%	5.44%
Expenses after incentive fees	[2],[3]	5.80%	5.44%
Total return before incentive fees	[4]	6.84%	1.39%
Total return after incentive fees	[4]	6.84%	1.39%
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Select Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 94.2	$ 103.94
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(0.68)	(0.65)
Net gain/(loss) on investments, net of non-controlling interests	[1]	7.88	2.86
Net income/(loss)	[1]	7.2	2.21
Net asset value	[1]	$ 101.4	$ 106.15
Ratios to average net assets
Net investment income/(loss)		(2.82%)	(2.43%)
Expenses before incentive fees	[2],[3]	2.82%	2.43%
Expenses after incentive fees	[2],[3]	2.82%	2.43%
Total return before incentive fees	[4]	7.64%	2.13%
Total return after incentive fees	[4]	7.64%	2.13%
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Select Fund [Member] | Class 1AP [Member]
Net asset value	[1]	$ 70.99	$ 78.51
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(0.51)	(0.49)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.93	1.97
Net income/(loss)	[1]	5.42	1.49
Net asset value	[1]	$ 76.41	$ 79.99
Ratios to average net assets
Net investment income/(loss)		(2.82%)	(2.43%)
Expenses before incentive fees	[2],[3]	2.82%	2.43%
Expenses after incentive fees	[2],[3]	2.82%	2.43%
Total return before incentive fees	[4]	7.64%	1.89%
Total return after incentive fees	[4]	7.64%	1.89%
Incentive fee per share
Incentive Fee to ANA			0.00%
Frontier Global Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 110.9	$ 131.52
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(2.21)	(2.73)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.63	17.19
Net income/(loss)	[1]	3.42	14.46
Net asset value	[1]	$ 114.32	$ 145.97
Ratios to average net assets
Net investment income/(loss)		(7.88%)	(8.01%)
Expenses before incentive fees	[2],[3]	7.88%	8.01%
Expenses after incentive fees	[2],[3]	7.88%	8.01%
Total return before incentive fees	[4]	3.09%	10.99%
Total return after incentive fees	[4]	3.09%	10.99%
Frontier Global Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 167.56	$ 192.82
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(2.08)	(2.51)
Net gain/(loss) on investments, net of non-controlling interests	[1]	8.54	25.33
Net income/(loss)	[1]	6.45	22.82
Net asset value	[1]	$ 174.01	$ 215.64
Ratios to average net assets
Net investment income/(loss)		(4.90%)	(5.01%)
Expenses before incentive fees	[2],[3]	4.90%	5.01%
Expenses after incentive fees	[2],[3]	4.90%	5.01%
Total return before incentive fees	[4]	3.85%	11.83%
Total return after incentive fees	[4]	3.85%	11.83%
Frontier Global Fund [Member] | Class 1AP [Member]
Net asset value	[1]		$ 154.43
Net operating results:
Interest income	[1]		0
Expenses	[1]		(2.02)
Net gain/(loss) on investments, net of non-controlling interests	[1]		20.67
Net income/(loss)	[1]		18.66
Net asset value	[1]		$ 173.08
Ratios to average net assets
Net investment income/(loss)			(5.01%)
Expenses before incentive fees	[2],[3]		5.01%
Expenses after incentive fees	[2],[3]		5.01%
Total return before incentive fees	[4]		12.08%
Total return after incentive fees	[4]		12.08%
Frontier Heritage Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 96.1	$ 97.54
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(1.74)	(1.82)
Net gain/(loss) on investments, net of non-controlling interests	[1]	9.41	18.5
Net income/(loss)	[1]	7.67	16.67
Net asset value	[1]	$ 103.77	$ 114.21
Ratios to average net assets
Net investment income/(loss)		(6.94%)	(7.05%)
Expenses before incentive fees	[2],[3]	6.94%	7.05%
Expenses after incentive fees	[2],[3]	6.94%	7.05%
Total return before incentive fees	[4]	7.99%	17.09%
Total return after incentive fees	[4]	7.99%	17.09%
Frontier Heritage Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 155.92	$ 153.59
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(1.61)	(1.65)
Net gain/(loss) on investments, net of non-controlling interests	[1]	15.31	29.23
Net income/(loss)	[1]	13.7	27.58
Net asset value	[1]	$ 169.62	$ 181.17
Ratios to average net assets
Net investment income/(loss)		(3.96%)	(4.04%)
Expenses before incentive fees	[2],[3]	3.96%	4.04%
Expenses after incentive fees	[2],[3]	3.96%	4.04%
Total return before incentive fees	[4]	8.79%	17.96%
Total return after incentive fees	[4]	8.79%	17.96%
Frontier Heritage Fund [Member] | Class 1AP [Member]
Net asset value	[1]	$ 116.5	$ 114.15
Net operating results:
Interest income	[1]	0	0
Expenses	[1]	(1.20)	(1.24)
Net gain/(loss) on investments, net of non-controlling interests	[1]	11.44	22.46
Net income/(loss)	[1]	10.24	21.22
Net asset value	[1]	$ 126.74	$ 135.37
Ratios to average net assets
Net investment income/(loss)		(3.96%)	(4.04%)
Expenses before incentive fees	[2],[3]	3.96%	4.04%
Expenses after incentive fees	[2],[3]	3.96%	4.04%
Total return before incentive fees	[4]	8.79%	18.59%
Total return after incentive fees	[4]	8.79%	18.59%
[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.

Financial Highlights (Frontier

Financial Highlights (Frontier Funds) (Details 1) - Frontier Funds [Member]		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net investment income/(loss)	[1]	(6.20%)	(5.77%)
Expenses before incentive fees	[2]	6.06%	5.84%
Expenses after incentive fees	[2]	6.26%	5.84%
Total return before incentive fees	[3]	6.45%	(15.26%)
Total return after incentive fees	[3]	4.56%	(15.26%)
[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_3

Derivative Instruments and Hedging Activities (The Series of the Frontier Funds) (Details) - The Series of the Frontier Funds [Member] - Frontier Balanced Fund [Member] - Number	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Numbers of Instruments Bought	788	613	1,209	2,183
Derivative Numbers of Instruments Sold	787	612	1,409	1,971

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities (The Series of the Frontier Funds) (Details 1) - The Series of the Frontier Funds [Member] - Frontier Balanced Fund [Member] - Realized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Realized trading income/(loss)	[1]	$ 371,559	$ 642,234
Agriculturals [Member]
Realized trading income/(loss)		63,312	75,122
Currencies [Member]
Realized trading income/(loss)		(27,812)	106,325
Energies [Member]
Realized trading income/(loss)		34,820	35,710
Interest rates [Member]
Realized trading income/(loss)		106,786	88,571
Metals [Member]
Realized trading income/(loss)		23,335	313,738
Stock indices [Member]
Realized trading income/(loss)		$ 171,118	$ 22,768
[1]	Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities (The Series of the Frontier Funds) (Details 2) - The Series of the Frontier Funds [Member] - Frontier Balanced Fund [Member] - Unrealized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Change in unrealized trading income/(loss)	[1]	$ (47,335)	$ (25,719)
Agriculturals [Member]
Change in unrealized trading income/(loss)		6,802	978
Currencies [Member]
Change in unrealized trading income/(loss)		17,052	21,386
Energies [Member]
Change in unrealized trading income/(loss)		16,600	(1,845)
Interest rates [Member]
Change in unrealized trading income/(loss)		(76,782)	4,169
Metals [Member]
Change in unrealized trading income/(loss)		(15,723)	(43,253)
Stock indices [Member]
Change in unrealized trading income/(loss)		$ 4,716	$ (7,154)
[1]	Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit)

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities (The Series of the Frontier Funds) (Details 3) - The Series of the Frontier Funds [Member] - Frontier Balanced Fund [Member] - Open Trade Equity/(Deficit) [Member] - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Gross Amounts of recognized Derivative Assets/ Liabilities	$ 597,031	$ 814,743
Gross Amounts offset in the Statements of Financial Condition	(543,924)	(714,303)
Net Amounts Presented in the Statements of Financial Condition	$ 53,107	$ 100,440

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities (Frontier Funds) (Details) - Frontier Fund [Member] - Realized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Realized trading income/(loss)	[1]	$ 371,560	$ 642,234
Agriculturals [Member]
Realized trading income/(loss)		63,312	75,122
Currencies [Member]
Realized trading income/(loss)		(27,812)	106,325
Energies [Member]
Realized trading income/(loss)		34,820	35,710
Interest rates [Member]
Realized trading income/(loss)		106,786	88,571
Metals [Member]
Realized trading income/(loss)		23,335	313,738
Stock indices [Member]
Realized trading income/(loss)		$ 171,119	$ 22,768
[1]	Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities (Frontier Funds) (Details 1) - Frontier Fund [Member] - Net Change in Open Trade Equity from Futures, Forwards and Options [Member] - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Change in unrealized trading income/(loss)	[1]	$ (47,335)	$ (25,719)
Agriculturals [Member]
Change in unrealized trading income/(loss)		6,802	978
Currencies [Member]
Change in unrealized trading income/(loss)		17,052	21,386
Energies [Member]
Change in unrealized trading income/(loss)		16,600	(1,845)
Interest rates [Member]
Change in unrealized trading income/(loss)		(76,782)	4,169
Metals [Member]
Change in unrealized trading income/(loss)		(15,723)	(43,253)
Stock indices [Member]
Change in unrealized trading income/(loss)		$ 4,716	$ (7,154)
[1]	Amounts recorded in the Statements of Operations under Net change in open trade equity/(deficit)

Derivative Instruments and He_9

Derivative Instruments and Hedging Activities (Frontier Funds) (Details 2) - Frontier Fund [Member] - Open Trade Equity/(Deficit) [Member] - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Gross Amounts of recognized Derivative Assets/Liabilities	$ 597,031	$ 814,743
Gross Amounts offset in the Statements of Financial Condition	(543,924)	(714,303)
Net Amounts Presented in the Statements of Financial Condition	$ 53,107	$ 100,440

Derivative Instruments and H_10

Derivative Instruments and Hedging Activities (Frontier Funds) (Details Textual) - Frontier Fund [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments and Hedging Activities (Frontier Funds) (Textual)
Monthly average of forwards, options and futures contracts bought	$ 788	$ 787
Monthly average of forwards, options and futures contracts sold	$ 628	$ 274
Minimum [Member]
Derivative Instruments and Hedging Activities (Frontier Funds) (Textual)
Percentage of embedded management fees	1.00%
Percentage of fair value of swaps and embedded incentive fees	15.00%
Maximum [Member]
Derivative Instruments and Hedging Activities (Frontier Funds) (Textual)
Percentage of embedded management fees	1.50%
Percentage of fair value of swaps and embedded incentive fees	25.00%

Trading Activities and Relate_2

Trading Activities and Related Risks (The Series of the Frontier Funds) (Details)	3 Months Ended
	Mar. 31, 2021
The Series of the Frontier Funds [Member]
Trading Activities and Related Risks (Textual)
Trading activities and related risks ,description	If the markets should move against all of the futures positions held by a Trading Company in respect of any Series at the same time, and if the Trading Advisor(s) of such Trading Company are unable to offset such futures interests positions, such Trading Company 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.

Trading Activities and Relate_3

Trading Activities and Related Risks (Frontier Funds) (Details)	3 Months Ended
	Mar. 31, 2021
Frontier Fund [Member]
Trading Activities and Related Risks (Frontier Funds) (Textual)
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 (The Series o

Subsequent Events (The Series of the Frontier Funds) (Details)	3 Months Ended
	Mar. 30, 2021
The Series of the Frontier Funds [Member] | Managing Owner [Member]
Subsequent Events (The Series of the Frontier Funds) (Textual)
Redemptions, description	April 1, 2021 through XXXX XX, 2021, Frontier Balanced Fund, Frontier Diversified Fund, Frontier Heritage Fund, Frontier Long/Short Commodity Fund, Frontier Masters Fund, Frontier Select Fund, and Frontier Global Fund paid $XXXX, $XXXX, $XXXX, $XXXX, $XXXX, $XXXX and $XXXX, respectively, in redemptions.

Subsequent Events (Frontier Fun

Subsequent Events (Frontier Funds) (Details)	3 Months Ended
	Mar. 31, 2021
Managing Owner [Member] | Frontier Funds [Member]
Subsequent Events (Frontier Funds) (Textual)
Redemptions, description	April 1, 2021 through xxxx xx, 2021, the Trust paid $xxxx in redemptions.