Frontier Funds 10-K/A 8 Jul 21 2020 FY Annual report (amended) Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020
Document and Entity Information [Abstract]
Entity Registrant Name	Frontier Funds
Entity Central Index Key	0001261379
Document Type	10-K/A
Document Period End Date	Dec. 31, 2020
Amendment Flag	true
Amendment Description	The purpose of this Amendment (the “Amendment”) to our Form 10-K for the annual period ended December 31, 2020 (the “Form 10-K”), as filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2021 (the “Original Filing”), is solely to include the Independent Auditor’s Report for the period of the report, which was inadvertently omitted from the Original Filing.Except as described above, this Amendment does not amend, update or change any other items or disclosures in the Original Filing. This Amendment speaks only as of the date the Original Filing was filed, and the Company has not undertaken herein to amend, supplement or update any information contained in the Original Filing to give effect to any subsequent events. Accordingly, this Amendment should be read in conjunction with the filings made with the SEC subsequent to the filing of the Original Filing, including any amendment to those filings.
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
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float		$ 0

Statements of Financial Conditi

Statements of Financial Condition - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Frontier Funds [Member]
ASSETS
Cash and cash equivalents	$ 468,466	$ 367,568
U.S. Treasury securities, at fair value	2,282,606	650,728
Open trade equity, at fair value	100,440	116,184
Receivable from futures commission merchants	233,973	2,526,242
Swap contracts, at fair value		21,579,865
Investments in private investment companies, at fair value	23,089,312	35,926,037
Interest receivable	45,578	13,363
Receivable from related parties	26,129	11,453
Redemptions receivable from private investment companies	181,323	552,017
Other assets		5,700
Total Assets	26,427,827	61,749,157
LIABILITIES
Open trade deficit, at fair value
Redemptions payable	38,128	133,633
Management fees payable to Managing Owner	8,854	8,795
Interest payable to Managing Owner	2,107	327
Service fees payable to Managing Owner	36,705	68,762
Trading fees payable to Managing Owner	81,698	160,907
Risk analysis fees payable	9,513	8,465
Payables to related parties	26,129
Advance on unrealized swap appreciation		12,191,555
Subscriptions in advance for service fee rebates	638,962	598,042
Other liabilities	16,592	22,078
Total Liabilities	858,688	13,192,564
CAPITAL
Managing Owner Units	283,217	487,974
Limited Owner Units	25,285,922	48,068,619
Total Owners' Capital	25,569,139	48,556,593
Total Liabilities and Capital	26,427,827	61,749,157
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member]
ASSETS
Cash and cash equivalents	87,715	56,263
U.S. Treasury securities, at fair value	427,393	99,605
Swap contracts, at fair value		6,384,583
Investments in private investment companies, at fair value	3,644,603	9,305,733
Investments in unconsolidated trading companies, at fair value	16,669	24,150
Interest receivable	8,534	2,027
Receivable from related parties	4,892	11,453
Redemptions receivable from private investment companies	31,886	171,906
Other assets		5,700
Total Assets	4,221,692	16,061,420
LIABILITIES
Redemptions payable
Interest payable to Managing Owner
Service fees payable to Managing Owner	385	3,392
Trading fees payable to Managing Owner	12,576	35,877
Advance on unrealized swap appreciation		4,000,000
Subscriptions in advance for service fee rebates	22,650	22,531
Other liabilities	3,110
Total Liabilities	38,721	4,061,800
CAPITAL
Total Owners' Capital	4,182,971	11,999,620
Non-Controlling Interests
Total Capital	4,182,971	11,999,620
Total Liabilities and Capital	4,221,692	16,061,420
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 154,260	$ 1,303,195
Units Outstanding	2,122	12,890
Net Asset Value per Unit	$ 72.68	$ 101.10
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 1a [Member]
CAPITAL
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 2,212	$ 3,023
Limited Owner Units	$ 464,012	$ 5,597,828
Units Outstanding	5,241	46,067
Net Asset Value per Unit	$ 88.95	$ 121.58
The Series of 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 Frontier Funds [Member] | Frontier Diversified Fund [Member] | Class 3 [Member]
CAPITAL
Managing Owner Units	$ 54,405	$ 115,933
Limited Owner Units	$ 3,508,082	$ 4,979,641
Units Outstanding	42,754	44,853
Net Asset Value per Unit	$ 83.33	$ 113.61
The Series of 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 Frontier Funds [Member] | Frontier Masters Fund [Member]
ASSETS
Cash and cash equivalents	$ 4,771	$ 25,639
U.S. Treasury securities, at fair value	23,245	45,391
Swap contracts, at fair value
Investments in private investment companies, at fair value	1,014,591	2,198,997
Investments in unconsolidated trading companies, at fair value	907	11,005
Interest receivable	464	924
Receivable from related parties	266
Redemptions receivable from private investment companies	24,837
Other assets
Total Assets	1,069,081	2,281,956
LIABILITIES
Redemptions payable	38,128
Interest payable to Managing Owner
Service fees payable to Managing Owner	70	204
Trading fees payable to Managing Owner	5,460	11,673
Advance on unrealized swap appreciation
Subscriptions in advance for service fee rebates	31,725	31,541
Other liabilities	171	499
Total Liabilities	75,554	43,917
CAPITAL
Total Owners' Capital	993,527	2,238,039
Non-Controlling Interests
Total Capital	993,527	2,238,039
Total Liabilities and Capital	1,069,081	2,281,956
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 9,740	$ 12,794
Units Outstanding	177	177
Net Asset Value per Unit	$ 55.18	$ 72.28
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 1a [Member]
CAPITAL
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 6,265	$ 13,043
Limited Owner Units	$ 257,673	$ 837,765
Units Outstanding	3,908	9,759
Net Asset Value per Unit	$ 67.54	$ 87.18
The Series of 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 Frontier Funds [Member] | Frontier Masters Fund [Member] | Class 3 [Member]
CAPITAL
Managing Owner Units	$ 7,167	$ 9,228
Limited Owner Units	$ 712,682	$ 1,365,209
Units Outstanding	11,333	16,806
Net Asset Value per Unit	$ 63.52	$ 81.78
The Series of 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 Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
ASSETS
Cash and cash equivalents	$ 93,327	$ 34,272
U.S. Treasury securities, at fair value	454,738	60,673
Swap contracts, at fair value		362,521
Investments in private investment companies, at fair value	738,053	986,757
Investments in unconsolidated trading companies, at fair value	17,736	14,711
Interest receivable	9,080	1,296
Receivable from related parties	5,205
Redemptions receivable from private investment companies	1,251
Other assets
Total Assets	1,319,390	1,460,230
LIABILITIES
Redemptions payable		6,585
Interest payable to Managing Owner	87
Service fees payable to Managing Owner	18
Trading fees payable to Managing Owner	2,281	3,468
Advance on unrealized swap appreciation		115,000
Subscriptions in advance for service fee rebates	393	220
Other liabilities	3,308	667
Total Liabilities	6,087	125,940
CAPITAL
Total Owners' Capital	1,313,303	1,334,290
Non-Controlling Interests
Total Capital	1,313,303	1,334,290
Total Liabilities and Capital	1,319,390	1,460,230
The Series of 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 Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 1a [Member]
CAPITAL
Limited Owner Units		$ 11,447
Units Outstanding		259
Net Asset Value per Unit		$ 44.20
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 3,939	$ 4,530
Limited Owner Units	$ 30,334	$ 36,515
Units Outstanding	399	503
Net Asset Value per Unit	$ 85.99	$ 81.60
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 2a [Member]
CAPITAL
Managing Owner Units	$ 8,274	$ 7,861
Limited Owner Units	$ 76,583	$ 73,965
Units Outstanding	1,535	1,557
Net Asset Value per Unit	$ 52.29	$ 52.55
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
CAPITAL
Managing Owner Units
Limited Owner Units	$ 976,771	$ 991,828
Units Outstanding	10,828	11,581
Net Asset Value per Unit	$ 90.21	$ 85.64
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Class 3a [Member]
CAPITAL
Managing Owner Units	$ 1,048	$ 993
Limited Owner Units	$ 216,354	$ 207,151
Units Outstanding	3,725	3,763
Net Asset Value per Unit	$ 58.37	$ 55.31
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member]
ASSETS
Cash and cash equivalents	$ 261,803	$ 118,506
U.S. Treasury securities, at fair value	1,275,641	209,799
Open trade equity, at fair value	100,440	116,184
Receivable from futures commission merchants	233,973	2,526,242
Swap contracts, at fair value		11,944,753
Investments in private investment companies, at fair value	10,528,252	13,809,892
Investments in unconsolidated trading companies, at fair value	49,755	50,867
Interest receivable	25,471	4,270
Receivable from related parties	14,602
Redemptions receivable from private investment companies	55,473	380,111
Other assets
Total Assets	12,545,410	29,160,624
LIABILITIES
Redemptions payable		39,059
Management fees payable to Managing Owner	8,854	8,795
Interest payable to Managing Owner	1,376	105
Service fees payable to Managing Owner	21,381	41,635
Trading fees payable to Managing Owner	37,894	70,179
Risk analysis fees payable	9,513	8,465
Payables to related parties
Advance on unrealized swap appreciation		6,176,555
Subscriptions in advance for service fee rebates	346,855	319,698
Other liabilities	9,258	2,372
Total Liabilities	435,131	6,666,863
CAPITAL
Total Owners' Capital	12,110,279	22,493,761
Non-Controlling Interests
Total Capital	12,110,279	22,493,761
Total Liabilities and Capital	12,545,410	29,160,624
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 9,430,532	$ 17,797,600
Units Outstanding	117,991	151,814
Net Asset Value per Unit	$ 79.93	$ 117.23
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 51,810	$ 73,748
Limited Owner Units	$ 1,906,359	$ 3,288,105
Units Outstanding	15,000	18,092
Net Asset Value per Unit	$ 130.54	$ 185.82
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 2a [Member]
CAPITAL
Managing Owner Units	$ 75,416	$ 151,133
Limited Owner Units	$ 30,961	$ 44,048
Units Outstanding	940	1,212
Net Asset Value per Unit	$ 113.20	$ 161.04
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 3a [Member]
CAPITAL
Limited Owner Units	$ 507,148	$ 900,583
Units Outstanding	4,495	5,611
Net Asset Value per Unit	$ 112.81	$ 160.50
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Class 1AP [Member]
CAPITAL
Limited Owner Units	$ 108,053	$ 238,544
Units Outstanding	1,116	1,731
Net Asset Value per Unit	$ 96.81	$ 137.81
The Series of Frontier Funds [Member] | Frontier Select Fund [Member]
ASSETS
Cash and cash equivalents		$ 61,345
U.S. Treasury securities, at fair value		108,603
Open trade equity, at fair value
Receivable from futures commission merchants
Swap contracts, at fair value
Investments in private investment companies, at fair value	1,638,665	2,184,240
Investments in unconsolidated trading companies, at fair value		505,355
Interest receivable		2,268
Receivable from related parties
Redemptions receivable from private investment companies	67,876
Other assets
Total Assets	1,706,541	2,861,811
LIABILITIES
Redemptions payable		6,875
Management fees payable to Managing Owner
Interest payable to Managing Owner	179
Service fees payable to Managing Owner	3,709	6,906
Trading fees payable to Managing Owner	3,933	6,000
Risk analysis fees payable
Payables to related parties	26,129
Advance on unrealized swap appreciation
Subscriptions in advance for service fee rebates	19,463	16,895
Other liabilities		8,509
Total Liabilities	53,413	45,185
CAPITAL
Total Owners' Capital	1,653,128	2,816,626
Non-Controlling Interests
Total Capital	1,653,128	2,816,626
Total Liabilities and Capital	1,706,541	2,861,811
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 1,575,328	$ 2,715,051
Units Outstanding	26,906	40,793
Net Asset Value per Unit	$ 58.55	$ 66.56
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 17,210	$ 29,831
Limited Owner Units	$ 50,769	$ 60,910
Units Outstanding	722	873
Net Asset Value per Unit	$ 94.20	$ 103.94
The Series of 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 Frontier Funds [Member] | Frontier Select Fund [Member] | Class 3a [Member]
CAPITAL
Limited Owner Units
Units Outstanding
Net Asset Value per Unit
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Class 1AP [Member]
CAPITAL
Limited Owner Units	$ 9,821	$ 10,834
Units Outstanding	138	138
Net Asset Value per Unit	$ 70.99	$ 78.51
The Series of Frontier Funds [Member] | Frontier Global Fund
ASSETS
Cash and cash equivalents	$ 5,694	$ 27,532
U.S. Treasury securities, at fair value	27,742	48,741
Swap contracts, at fair value
Investments in private investment companies, at fair value	3,068,656	5,022,967
Investments in unconsolidated trading companies, at fair value	1,083	11,818
Interest receivable	554	992
Receivable from related parties	319
Total Assets	3,104,048	5,112,050
LIABILITIES
Redemptions payable		71,379
Interest payable to Managing Owner	326	56
Service fees payable to Managing Owner	6,348	11,263
Trading fees payable to Managing Owner	11,849	22,540
Advance on unrealized swap appreciation
Subscriptions in advance for service fee rebates	154,671	150,025
Other liabilities	205	8,543
Total Liabilities	173,399	263,806
CAPITAL
Total Owners' Capital	2,930,649	4,848,244
Non-Controlling Interests
Total Capital	2,930,649	4,848,244
Total Liabilities and Capital	3,104,048	5,112,050
The Series of Frontier Funds [Member] | Frontier Global Fund | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 2,741,972	$ 4,471,980
Units Outstanding	24,725	34,003
Net Asset Value per Unit	$ 110.90	$ 131.52
The Series of Frontier Funds [Member] | Frontier Global Fund | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 31,366	$ 50,058
Limited Owner Units	$ 157,311	$ 293,159
Units Outstanding	1,126	1,780
Net Asset Value per Unit	$ 167.56	$ 192.82
The Series of Frontier Funds [Member] | Frontier Global Fund | Class 1AP [Member]
CAPITAL
Limited Owner Units		$ 33,047
Units Outstanding		214
Net Asset Value per Unit		$ 154.43
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member]
ASSETS
Cash and cash equivalents	$ 15,156	$ 44,011
U.S. Treasury securities, at fair value	73,847	77,916
Swap contracts, at fair value		2,888,008
Investments in private investment companies, at fair value	2,367,462	2,259,678
Investments in unconsolidated trading companies, at fair value	2,880	18,891
Interest receivable	1,475	1,586
Receivable from related parties	845
Total Assets	2,461,665	5,290,090
LIABILITIES
Redemptions payable		9,735
Interest payable to Managing Owner	139	166
Service fees payable to Managing Owner	4,794	5,362
Trading fees payable to Managing Owner	7,705	11,170
Advance on unrealized swap appreciation		1,900,000
Subscriptions in advance for service fee rebates	63,205	57,132
Other liabilities	540	1,488
Total Liabilities	76,383	1,985,053
CAPITAL
Total Owners' Capital	2,385,282	2,826,013
Non-Controlling Interests		479,024
Total Capital	2,385,282	3,305,037
Total Liabilities and Capital	2,461,665	5,290,090
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1 [Member]
CAPITAL
Limited Owner Units	$ 2,169,152	$ 2,295,623
Units Outstanding	22,572	23,536
Net Asset Value per Unit	$ 96.10	$ 97.54
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 2 [Member]
CAPITAL
Managing Owner Units	$ 24,105	$ 28,593
Limited Owner Units	$ 183,565	$ 493,464
Units Outstanding	1,332	3,399
Net Asset Value per Unit	$ 155.92	$ 153.59
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Class 1AP [Member]
CAPITAL
Limited Owner Units	$ 8,460	$ 8,333
Units Outstanding	73	73
Net Asset Value per Unit	$ 116.50	$ 114.15

Condensed Schedule of Investmen

Condensed Schedule of Investments - USD ($)		Dec. 31, 2020		Dec. 31, 2019
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[1]			$ 6,384,583
Investment Owned, % of Total Capital (Net Asset Value)	[1]			53.21%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Swap [Member] | Frontier XXXV Diversified Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]			$ 6,384,583
Investment Owned, % of Total Capital (Net Asset Value)	[1]			53.21%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Swap [Member] | Frontier XXXVII L/S Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[2]	$ 3,644,603		$ 9,305,733
Investment Owned, % of Total Capital (Net Asset Value)	[2]	87.12%		77.54%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Investment Owned, Fair Value	[2]			$ 494,968
Investment Owned, % of Total Capital (Net Asset Value)	[2]			4.12%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Investment Owned, Fair Value	[2]			$ 1,267,090
Investment Owned, % of Total Capital (Net Asset Value)	[2]			10.56%
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	[2]	$ 1,066,074		$ 2,031,482
Investment Owned, % of Total Capital (Net Asset Value)	[2]	25.49%		16.93%
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	[2]	$ 414,692		$ 1,460,173
Investment Owned, % of Total Capital (Net Asset Value)	[2]	9.91%		12.17%
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	[2]	$ 672,766		$ 499,551
Investment Owned, % of Total Capital (Net Asset Value)	[2]	16.08%		4.16%
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	[2]	$ 732,066		$ 1,827,263
Investment Owned, % of Total Capital (Net Asset Value)	[2]	17.50%		15.23%
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	[2]	$ 435,119		$ 1,549,720
Investment Owned, % of Total Capital (Net Asset Value)	[2]	10.40%		12.91%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]			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	[2]			$ 175,486
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		1.46%
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	[2]	$ 323,886
Investment Owned, % of Total Capital (Net Asset Value)	[2]	7.74%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[2]	$ 16,669	[3]	$ 24,150
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.40%	[3]	0.20%
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	[2]	$ 16,669		$ 24,150
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.40%		0.20%
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 427,393	[4]	$ 99,605	[5]
Investment Owned, % of Total Capital (Net Asset Value)		10.22%	[4]	0.83%
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	[5]	$ 328,604		$ 99,605
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.40%		0.83%
Investment Owned, Underlying Face Amount, at Face Value	[5]	$ 80,000		$ 510,000
Investment Owned, at Cost		427,509	[5]	652,026
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	[5]			78,065
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	[5]			99,804
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]			78,065
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]			99,804
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Swap [Member] | Frontier XXXV Diversified Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Swap [Member] | Frontier XXXVII L/S Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[2]	$ 1,014,591		$ 2,198,997
Investment Owned, % of Total Capital (Net Asset Value)	[2]	102.12%		98.26%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Investment Owned, Fair Value	[2]			$ 210,013
Investment Owned, % of Total Capital (Net Asset Value)	[2]			9.38%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
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	[2]	$ 486,659		$ 1,049,575
Investment Owned, % of Total Capital (Net Asset Value)	[2]	48.98%		46.90%
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	[2]	$ 258,609		$ 466,988
Investment Owned, % of Total Capital (Net Asset Value)	[2]	26.03%		20.87%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Investment Owned, Fair Value	[2]			$ 472,421
Investment Owned, % of Total Capital (Net Asset Value)	[2]			21.11%
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	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	[2]	$ 269,323
Investment Owned, % of Total Capital (Net Asset Value)	[2]	27.11%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[2]	$ 907	[3]	$ 11,005
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.09%	[3]	0.49%
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	[2]	$ 907		$ 11,005
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.09%		0.49%
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 23,245	[4]	$ 45,391	[5]
Investment Owned, % of Total Capital (Net Asset Value)		2.34%	[4]	2.03%	[5]
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	[5]	$ 17,872		$ 45,391
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.09%		2.03%
Investment Owned, Underlying Face Amount, at Face Value	[5]	$ 80,000		$ 510,000
Investment Owned, at Cost	[5]	23,251		652,026
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	[5]			35,575
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	[5]			45,482
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]			35,575
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]			45,482
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[1]			$ 362,521
Investment Owned, % of Total Capital (Net Asset Value)	[1]			27.17%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Swap [Member] | Frontier XXXV Diversified Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Swap [Member] | Frontier XXXVII L/S Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]			$ 362,521
Investment Owned, % of Total Capital (Net Asset Value)	[1]			27.17%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[2]	$ 738,053		$ 986,757
Investment Owned, % of Total Capital (Net Asset Value)	[2]	56.19%		73.95%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Investment Owned, Fair Value	[2]			$ 111,013
Investment Owned, % of Total Capital (Net Asset Value)	[2]			8.32%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
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	[2]	$ 272,294		$ 343,834
Investment Owned, % of Total Capital (Net Asset Value)	[2]	20.73%		25.77%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]
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	[2]	$ 465,759		$ 531,910
Investment Owned, % of Total Capital (Net Asset Value)	[2]	35.46%		39.86%
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[2]	$ 17,736	[3]	$ 14,711
Investment Owned, % of Total Capital (Net Asset Value)	[2]	1.35%	[3]	1.10%
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	[2]	$ 17,736		$ 14,711
Investment Owned, % of Total Capital (Net Asset Value)	[2]	1.35%		1.10%
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 454,738	[4]	$ 60,673	[5]
Investment Owned, % of Total Capital (Net Asset Value)		34.63%	[4]	4.55%	[5]
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	[5]	$ 349,629		$ 60,673
Investment Owned, % of Total Capital (Net Asset Value)	[5]	1.35%		4.55%
Investment Owned, Underlying Face Amount, at Face Value	[5]	$ 80,000		$ 510,000
Investment Owned, at Cost	[5]	454,862		652,026
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	[5]			47,552
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	[5]			60,794
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]			47,552
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]			60,794
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[1]			$ 11,944,753
Investment Owned, % of Total Capital (Net Asset Value)	[1]			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	[1]			$ 11,944,753
Investment Owned, % of Total Capital (Net Asset Value)	[1]			53.10%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[2]	$ 10,528,252		$ 13,809,892
Investment Owned, % of Total Capital (Net Asset Value)	[2]	86.93%		61.39%
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	[2]			$ 668,428
Investment Owned, % of Total Capital (Net Asset Value)	[2]			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	[2]			$ 1,913,873
Investment Owned, % of Total Capital (Net Asset Value)	[2]			8.51%
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	[2]	$ 2,311,240		$ 2,589,148
Investment Owned, % of Total Capital (Net Asset Value)	[2]	19.08%		11.51%
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	[2]	$ 1,581,941		$ 2,556,118
Investment Owned, % of Total Capital (Net Asset Value)	[2]	13.06%		11.36%
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	[2]	$ 982,020		$ 533,194
Investment Owned, % of Total Capital (Net Asset Value)	[2]	8.11%		2.37%
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	[2]	$ 1,600,611		$ 2,679,197
Investment Owned, % of Total Capital (Net Asset Value)	[2]	13.22%		11.91%
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	[2]	$ 2,612,336		$ 2,583,294
Investment Owned, % of Total Capital (Net Asset Value)	[2]	21.57%		11.48%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]			0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investment Owned, Fair Value	[2]			$ 286,640
Investment Owned, % of Total Capital (Net Asset Value)	[2]			1.27%
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	[2]	$ 1,440,104
Investment Owned, % of Total Capital (Net Asset Value)	[2]	11.89%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[2]	$ 49,755		$ 50,867
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.41%		0.23%
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	[2]	$ 49,755		$ 50,867
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.41%		0.23%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXIX, LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value	[5]	$ 17,266,387		$ 209,799
Investment Owned, % of Total Capital (Net Asset Value)	[5]			0.93%
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	[5]	$ 1,275,641		$ 209,799
Investment Owned, % of Total Capital (Net Asset Value)	[5]	10.53%		0.93%
Investment Owned, Underlying Face Amount, at Face Value	[5]	$ 980,787		$ 510,000
Investment Owned, at Cost	[5]			652,026
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	[5]			164,427
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	[5]			210,217
Investment Owned, at Cost	[5]
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member]
Investment Owned, Fair Value	[4]	$ 449,023		$ 54,119
Investment Owned, % of Total Capital (Net Asset Value)	[4]	3.70%		0.25%
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]	$ 87,496		$ 22,437
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.72%		0.10%
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		$ 22,858	[4]	$ (3,344)	[6]
Investment Owned, % of Total Capital (Net Asset Value)		0.19%	[4]	(0.01%)	[6]
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	[6]			$ (735)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
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]	$ 148,949		$ (2,763)
Investment Owned, % of Total Capital (Net Asset Value)	[4]	1.23%		(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]			$ 45,590
Investment Owned, % of Total Capital (Net Asset Value)	[4]			0.20%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | LONG FUTURES CONTRACTS [Member] | Various soft futures contracts (Far East) [Member]
Investment Owned, Fair Value	[4]			$ 709
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 Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[4]			$ 1,740
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 stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value	[6]			$ (2,506)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			(0.01%)
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	[6]			$ (7,157)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			(0.03%)
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	[6]			$ (21,237)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			(0.09%)
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	[6]			$ 21,385
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.10%
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	[4]	$ 72,005
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.59%
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 (Latin America) [Member]
Investment Owned, Fair Value	[4]	$ 5,833
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.05%
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 Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[4]	$ 2,882
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.02%
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]	$ 2,438
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.02%
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] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[4]	$ 9,803
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.08%
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	[4]	$ 5,312
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.04%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member]
Investment Owned, Fair Value	[4]	$ (348,583)		$ 2,938
Investment Owned, % of Total Capital (Net Asset Value)	[4]	(2.89%)		0.00%
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]			$ (6,369)
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 Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ (127,832)	[4]	$ 9,573	[6]
Investment Owned, % of Total Capital (Net Asset Value)		(1.06%)	[4]	0.04%	[6]
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	[4]	$ (25,560)
Investment Owned, % of Total Capital (Net Asset Value)	[4]	(0.21%)
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]	$ (42,669)		$ (3,340)
Investment Owned, % of Total Capital (Net Asset Value)	[4]	(0.35%)		(0.01%)
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 (Europe) [Member]
Investment Owned, Fair Value	[4]			$ (1,410)
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 energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ 3,380
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.02%
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	[6]			$ 1,104
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[6]			$ 1,104
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
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 currency futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[4]	$ 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 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]	$ 100,440		$ 116,184
Investment Owned, % of Total Capital (Net Asset Value)	[4]	0.81%		0.52%
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			$ 164,427
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			210,217
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Swap [Member] | Frontier XXXIV Balanced Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[2]	$ 1,638,665		$ 2,184,240
Investment Owned, % of Total Capital (Net Asset Value)	[2]	99.13%		77.55%
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]			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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]			0.00%
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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	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	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]	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	[2]	$ 956,968		$ 835,386
Investment Owned, % of Total Capital (Net Asset Value)	[2]	57.89%		29.66%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Investment Owned, Fair Value	[2]			$ 1,348,854
Investment Owned, % of Total Capital (Net Asset Value)	[2]			61.39%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[2]			$ 505,355
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		17.94%
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	[2]			$ 26,331
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.00%		0.93%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXIX, LLC [Member]
Investment Owned, Fair Value	[2]			$ 479,024
Investment Owned, % of Total Capital (Net Asset Value)	[2]			17.01%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value	[5]	$ 2,593,522		$ 108,603
Investment Owned, % of Total Capital (Net Asset Value)	[5]			3.86%
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	[5]			$ 108,603
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.00%		3.86%
Investment Owned, Underlying Face Amount, at Face Value	[5]			$ 510,000
Investment Owned, at Cost	[5]			652,026
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	[5]			85,116
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	[5]			108,820
Investment Owned, at Cost	[5]	6,686
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 (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 energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			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 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 (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 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 (Europe) [Member]
Investment Owned, Fair Value	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			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	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
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	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			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	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			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)	[4]	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)	[4]	0.00%
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 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 Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value			[4]		[6]
Investment Owned, % of Total Capital (Net Asset Value)		0.00%	[4]	0.00%	[6]
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 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 energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
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	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | SHORT FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[6]
Investment Owned, % of Total Capital (Net Asset Value)	[6]			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] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			$ 85,116
The Series of Frontier Funds [Member] | Frontier Select Fund [Member] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			108,820
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Swap [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Swap [Member] | Frontier Brevan Howard Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]
Investment Owned, % of Total Capital (Net Asset Value)	[1]
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[2]	$ 3,068,656		$ 5,022,967
Investment Owned, % of Total Capital (Net Asset Value)	[2]	104.71%		103.60%
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value	[2]	$ 3,068,656		$ 5,022,967
Investment Owned, % of Total Capital (Net Asset Value)	[2]	104.71%		103.60%
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[2]
Investment Owned, % of Total Capital (Net Asset Value)	[2]
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[2]	$ 1,083		$ 11,818
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.04%		0.24%
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Investment in Unconsolidated Trading Companies [Member] | Frontier Trading Company XXXVIII, LLC [Member]
Investment Owned, Fair Value	[2]	$ 1,083		$ 11,818
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.04%		0.24%
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value	[5]			$ 48,741
Investment Owned, % of Total Capital (Net Asset Value)	[5]			1.01%
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]	$ 27,742		$ 48,741
Investment Owned, % of Total Capital (Net Asset Value)	[5]	0.95%		1.01%
Investment Owned, Underlying Face Amount, at Face Value	[5]	$ 21,330		$ 510,000
Investment Owned, at Cost	[5]	27,750		652,026
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]	21,330		38,200
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value	[5]			48,838
Investment Owned, at Cost	[5]	27,750
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			38,200
The Series of Frontier Funds [Member] | Frontier Global Fund (formerly Frontier Winton Fund) [Member] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			48,838
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Swap [Member]
Investment Owned, Fair Value	[1]			$ 2,888,008
Investment Owned, % of Total Capital (Net Asset Value)	[1]			18.14%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Swap [Member] | Frontier Brevan Howard Swap (U.S.) [Member]
Investment Owned, Fair Value	[1]			$ 2,888,008
Investment Owned, % of Total Capital (Net Asset Value)	[1]			18.14%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[2]	$ 2,367,462		$ 2,259,678
Investment Owned, % of Total Capital (Net Asset Value)	[2]	99.25%		68.37%
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	[2]	$ 1,539,331		$ 1,473,432
Investment Owned, % of Total Capital (Net Asset Value)	[2]	64.53%		44.58%
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	[2]	$ 828,131		$ 786,246
Investment Owned, % of Total Capital (Net Asset Value)	[2]	34.72%		23.79%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Investment Owned, Fair Value	[2]	$ 2,880		$ 18,891
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.12%		0.57%
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	[2]	$ 2,880		$ 18,891
Investment Owned, % of Total Capital (Net Asset Value)	[2]	0.12%		0.57%
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value	[5]			$ 77,916
Investment Owned, % of Total Capital (Net Asset Value)	[5]			2.36%
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	[5]	$ 73,847		$ 77,916
Investment Owned, % of Total Capital (Net Asset Value)	[5]	3.10%		2.36%
Investment Owned, Underlying Face Amount, at Face Value	[5]	$ 56,778		$ 510,000
Investment Owned, at Cost	[5]	73,867		652,026
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	[5]	56,778		61,065
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	[5]			78,071
Investment Owned, at Cost	[5]	73,867
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			61,065
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member] | U.S. Treasury Securities One [Member]
Investment Owned, Fair Value	[5]			78,071
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	[2]	$ 681,697
Investment Owned, % of Total Capital (Net Asset Value)	[2]	41.24%
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 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 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 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 (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 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 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 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 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 currency 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 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] | Swap [Member]
Investment Owned, Fair Value	[7]			$ 21,579,865
Investment Owned, % of Total Capital (Net Asset Value)	[7]			44.45%
Frontier Funds [Member] | Swap [Member] | Frontier XXXV Diversified Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[7]			$ 6,384,583
Investment Owned, % of Total Capital (Net Asset Value)	[7]			13.15%
Frontier Funds [Member] | Swap [Member] | Frontier XXXVII L/S Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[7]			$ 362,521
Investment Owned, % of Total Capital (Net Asset Value)	[7]			0.75%
Frontier Funds [Member] | Swap [Member] | Frontier XXXIV Balanced Select Swap (U.S.) [Member]
Investment Owned, Fair Value	[7]			$ 11,944,753
Investment Owned, % of Total Capital (Net Asset Value)	[7]			24.60%
Frontier Funds [Member] | Swap [Member] | Frontier Brevan Howard Swap (U.S.) [Member]
Investment Owned, Fair Value	[7]			$ 2,888,008
Investment Owned, % of Total Capital (Net Asset Value)	[7]			5.95%
Frontier Funds [Member] | Private Investment Companies [Member]
Investment Owned, Fair Value	[8]	$ 23,089,312		$ 35,926,037
Investment Owned, % of Total Capital (Net Asset Value)	[8]	90.31%		73.99%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - EvE STP Feeder Fund (516) LLC [Member]
Investment Owned, Fair Value	[8]			$ 1,484,422
Investment Owned, % of Total Capital (Net Asset Value)	[8]			3.06%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Doherty Feeder Fund (528) LLC [Member]
Investment Owned, Fair Value	[8]			$ 3,180,963
Investment Owned, % of Total Capital (Net Asset Value)	[8]			6.55%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Fort Contrarian Feeder Fund (510) LLC [Member]
Investment Owned, Fair Value	[8]	$ 3,377,314		$ 4,620,630
Investment Owned, % of Total Capital (Net Asset Value)	[8]	13.21%		9.52%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value	[8]			$ 4,016,291
Investment Owned, % of Total Capital (Net Asset Value)	[8]			8.27%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Feeder Fund (517) LLC [Member]
Investment Owned, Fair Value	[8]	$ 1,654,786		$ 1,032,745
Investment Owned, % of Total Capital (Net Asset Value)	[8]	6.47%		2.13%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Aspect Feeder Fund (532) LLC [Member]
Investment Owned, Fair Value	[8]	$ 7,427,324		$ 12,052,434
Investment Owned, % of Total Capital (Net Asset Value)	[8]	29.05%		24.82%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC [Member]
Investment Owned, Fair Value	[8]	$ 5,363,456		$ 6,565,468
Investment Owned, % of Total Capital (Net Asset Value)	[8]	20.98%		13.52%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - TT Feeder Fund (531) LLC [Member]
Investment Owned, Fair Value	[8]			$ 1,821,275
Investment Owned, % of Total Capital (Net Asset Value)	[8]			3.75%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - LRR Feeder Fund (522) LLC [Member]
Investment Owned, Fair Value	[8]	$ 465,759		$ 994,036
Investment Owned, % of Total Capital (Net Asset Value)	[8]	1.82%		2.05%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - JL Cyril Systematic Feeder Fund (547) LLC) [Member]
Investment Owned, Fair Value	[8]	$ 2,715,008
Investment Owned, % of Total Capital (Net Asset Value)	[8]	10.62%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - QIM Feeder Fund (526) LLC [Member]
Investment Owned, Fair Value	[8]	$ 1,996,633
Investment Owned, % of Total Capital (Net Asset Value)	[8]	7.81%
Frontier Funds [Member] | Private Investment Companies [Member] | Galaxy Plus Fund - Quest Fit Feeder Fund (535) LLC [Member]
Investment Owned, Fair Value	[8]	$ 89,029		$ 157,773
Investment Owned, % of Total Capital (Net Asset Value)	[8]	0.35%		0.32%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member]
Investment Owned, Fair Value		$ 449,023	[9]	$ 54,119	[6]
Investment Owned, % of Total Capital (Net Asset Value)		1.74%	[9]	0.10%	[6]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ 87,496	[9]	$ 22,437	[6]
Investment Owned, % of Total Capital (Net Asset Value)		0.34%	[9]	0.05%	[6]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Base Metals Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ 22,858	[9]	$ (3,344)	[6]
Investment Owned, % of Total Capital (Net Asset Value)		0.09%	[9]	(0.01%)	[6]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ (735)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value		$ 148,949	[9]	$ (2,763)	[6]
Investment Owned, % of Total Capital (Net Asset Value)		0.58%	[9]	(0.01%)	[6]
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ 45,590
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.09%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ 1,740
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Europe) [Member]
Investment Owned, Fair Value	[6]			$ (2,506)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			(0.01%)
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[6]	$ 5,312		$ (7,157)
Investment Owned, % of Total Capital (Net Asset Value)	[6]	0.02%		(0.01%)
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various stock index futures contracts (Oceanic) [Member]
Investment Owned, Fair Value	[6]			$ (21,237)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			(0.04%)
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[6]			$ 709
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various agriculture futures contracts (Far East) [Member]
Investment Owned, Fair Value	[9]	$ 72,005
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.28%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[9]	$ 10,573
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.04%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Currency Futures Contracts (Latin America) [Member]
Investment Owned, Fair Value	[9]	$ 5,833
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.02%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various currency futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[9]	$ (100)
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.00%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[9]	$ 2,882
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.01%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[9]	$ 2,438
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.01%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[9]	$ 28,625
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.11%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various soft futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[9]	$ 52,349
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.20%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ 21,385
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.04%
Frontier Funds [Member] | LONG FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[6]	$ 9,803
Investment Owned, % of Total Capital (Net Asset Value)	[6]	0.04%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member]
Investment Owned, Fair Value		$ (348,583)	[9]	$ 2,937	[6]
Investment Owned, % of Total Capital (Net Asset Value)		(1.36%)	[9]	0.01%	[6]
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Agriculture Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value		$ (92,738)	[9]	$ (1,410)	[6]
Investment Owned, % of Total Capital (Net Asset Value)		(0.36%)	[9]	0.00%	[6]
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various energy futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ 3,380
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.01%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) [Member]
Investment Owned, Fair Value	[6]			$ 9,572
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.02%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ (6,369)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Soft Futures Contracts (U.S.) [Member]
Investment Owned, Fair Value	[6]			$ (3,340)
Investment Owned, % of Total Capital (Net Asset Value)	[6]			(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Stock Index Futures Contracts (Far East) [Member]
Investment Owned, Fair Value		$ (3,340)
Investment Owned, % of Total Capital (Net Asset Value)		(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Far East) [Member]
Investment Owned, Fair Value	[6]			$ 1,104
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.00%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various agriculture futures contracts (Far East) One [Member]
Investment Owned, Fair Value	[9]	$ 30,963
Investment Owned, % of Total Capital (Net Asset Value)	[9]	(0.12%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various base metals futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[9]	$ (10,289)
Investment Owned, % of Total Capital (Net Asset Value)	[9]	(0.04%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Europe) One [Member]
Investment Owned, Fair Value	[9]	$ (92,738)
Investment Owned, % of Total Capital (Net Asset Value)	[9]	(0.36%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (Latin America) One [Member]
Investment Owned, Fair Value	[9]	$ 2,512
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.01%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various currency futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[9]	$ 2,300
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.01%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various Interest Rates Futures Contracts (Europe) One [Member]
Investment Owned, Fair Value	[9]	$ (2,482)
Investment Owned, % of Total Capital (Net Asset Value)	[9]	(0.01%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various interest rates futures contracts (U.S.) One [Member]
Investment Owned, Fair Value	[9]	$ 3,656
Investment Owned, % of Total Capital (Net Asset Value)	[9]	0.01%
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various interest rates futures contracts (Europe) One [Member]
Investment Owned, Fair Value	[9]	$ (127,832)
Investment Owned, % of Total Capital (Net Asset Value)	[9]	(0.50%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various precious metal futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[9]	$ (25,560)
Investment Owned, % of Total Capital (Net Asset Value)	[9]	(0.10%)
Frontier Funds [Member] | SHORT FUTURES CONTRACTS [Member] | Various soft futures contracts (U.S.) [Member]
Investment Owned, Fair Value	[9]	$ (42,669)
Investment Owned, % of Total Capital (Net Asset Value)	[9]	(0.17%)
Frontier Funds [Member] | CURRENCY FORWARDS [Member] | Open Trade Equity (Deficit) [Member]
Investment Owned, Fair Value		$ 100,440	[9]	$ 116,184	[6]
Investment Owned, % of Total Capital (Net Asset Value)		0.38%	[9]	0.23%	[6]
Frontier Funds [Member] | Additional Disclosure on U.S. Treasury Securities [Member]
Investment Owned, Fair Value		$ 2,282,606		$ 650,728
Investment Owned, % of Total Capital (Net Asset Value)		8.93%		1.34%
Frontier Funds [Member] | Additional Disclosure on U.S. Treasury Securities [Member] | US Treasury Note [Member]
Investment Owned, Fair Value		$ 2,282,606		$ 650,728
Investment Owned, % of Total Capital (Net Asset Value)		8.93%		1.34%
Investment Owned, Underlying Face Amount, at Face Value		$ 1,755,000		$ 510,000
Investment Owned, at Cost		$ 2,283,228		652,026
Frontier Funds [Member] | CURRENCY FORWARDS [Member] | Various Currency Forwards Contracts (NA) [Member]
Investment Owned, Fair Value	[6]			$ 59,128
Investment Owned, % of Total Capital (Net Asset Value)	[6]			0.12%
Frontier Funds [Member] | CURRENCY FORWARDS [Member] | Total Currency Forwards [Member]
Investment Owned, Fair Value	[6]			$ 59,128
Investment Owned, % of Total Capital (Net Asset Value)	[6]			12.00%
[1]	See Note 4 to the Financial Statements.
[2]	See Note 5 to the Financial Statements.
[3]	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.
[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]	See Note 2 to the Financial Statements.
[6]	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.
[7]	See Notes to Consolidated Financial Statements, Note 4.
[8]	See Notes to Consolidated Financial Statements, Note 5.
[9]	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 Operations

Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member]
Investment income:
Interest - net	$ 441	$ 19,354	$ 35,454
Total Income/(loss)	441	19,354	35,454
Expenses:
Incentive Fees (rebate)			(4,499)
Management Fees		2,668	44,289
Service Fees - Class 1	14,246	44,726	58,473
Due Diligence Fees	8,636
Trading Fees	251,203	493,585	591,665
Other Fees			16,404
Total Expenses	274,085	540,979	706,332
Investment income/(loss) - net	(273,644)	(521,625)	(670,878)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	946,785	907,504	(2,307,071)
Net realized gain/(loss) on private investment companies	(1,549,052)	(730,551)	278,882
Net realized gain/(loss) on swap contracts	(446,306)
Net unrealized gain/(loss) on swap contracts	(1,537,399)	464,169	643,941
Net realized gain/(loss) on U.S. Treasury securities	(14,579)	14,359	(51,245)
Net unrealized gain/(loss) on U.S. Treasury securities	23,758	(19,045)	33,137
Change in fair value of investments in unconsolidated trading companies	11,127	(84,431)	(126,992)
Net gain/(loss) on investments	(2,565,666)	552,005	(1,529,348)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	(2,839,310)	30,380	(2,200,226)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ (2,839,310)	$ 30,380	$ (2,200,226)
The Series of 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	$ (28.42)	$ (1.15)	$ (14.16)
The Series of 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 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	(32.63)	0.74	(14.35)
The Series of 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 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	(30.28)	0.98	(13.06)
The Series of 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 Frontier Funds [Member] | Frontier Masters Fund [Member]
Investment income:
Interest - net	$ 2,476	$ 4,656	$ 23,657
Total Income/(loss)	2,476	4,656	23,657
Expenses:
Incentive Fees (rebate)
Management Fees		7,665	108,413
Risk analysis Fees	1,786	11,635	49,049
Due Diligence Fees	1,971
Trading Fees	101,300	213,153	420,391
Other Fees			27,336
Total Expenses	105,057	232,453	605,189
Investment income/(loss) - net	(102,581)	(227,797)	(581,532)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	393,123	(162,637)	(1,197,207)
Net realized gain/(loss) on private investment companies	(754,772)	(159,651)	(75,683)
Net realized gain/(loss) on swap contracts
Net unrealized gain/(loss) on swap contracts
Net realized gain/(loss) on U.S. Treasury securities	8,759	15,346	(45,198)
Net unrealized gain/(loss) on U.S. Treasury securities	(4,357)	(9,501)	(15,571)
Change in fair value of investments in unconsolidated trading companies	(3,287)	(67,029)	(179,768)
Net gain/(loss) on investments	(360,534)	(383,472)	(1,513,427)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	(463,115)	(611,269)	(2,094,959)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ (463,115)	$ (611,269)	$ (2,094,959)
The Series of 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	$ (17.10)	$ (18.82)	$ (23.64)
The Series of 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 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	(19.64)	(20.49)	(25.59)
The Series of 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 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	(18.26)	(18.98)	(23.63)
The Series of Frontier Funds [Member] | Frontier Masters 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 Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
Investment income:
Interest - net	$ 4,010	$ 2,018	$ 12,648
Total Income/(loss)	4,010	2,018	12,648
Expenses:
Incentive Fees (rebate)			(3,789)
Management Fees
Risk analysis Fees	381	562	1,653
Due Diligence Fees	363
Trading Fees	32,628	54,334	82,890
Other Fees			1,594
Total Expenses	33,372	54,896	82,348
Investment income/(loss) - net	(29,362)	(52,878)	(69,700)
Realized and unrealized gain/(loss) on investments:
Net unrealized gain/(loss) on private investment companies	283,384	198,426	(403,889)
Net realized gain/(loss) on private investment companies	(405,836)	(428,509)	(240,941)
Net realized gain/(loss) on swap contracts	188,100
Net unrealized gain/(loss) on swap contracts	44,277	(116,581)	82,063
Net realized gain/(loss) on U.S. Treasury securities	737	977	(40,742)
Net unrealized gain/(loss) on U.S. Treasury securities	(1,009)	2,447	14,319
Change in fair value of investments in unconsolidated trading companies	(11,314)	35	(18,068)
Net gain/(loss) on investments	98,339	(343,205)	(607,258)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	68,977	(396,083)	(676,958)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ 68,977	$ (396,083)	$ (676,958)
The Series of 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 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	(44.20)	(12.60)	(24.55)
The Series of 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	4.39	(17.22)	(16.99)
The Series of 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	2.74	(13.97)	(27.07)
The Series of 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	4.57	(18.02)	(17.84)
The Series of 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	$ 3.06	$ (14.51)	$ (28.16)
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member]
Investment income:
Interest - net	$ 6,361	$ 46,019	$ 38,298
Total Income/(loss)	6,361	46,019	38,298
Expenses:
Incentive Fees (rebate)			145,134
Management Fees	19,600	22,377	77,495
Risk analysis Fees	5,880	5,576	8,738
Service Fees - Class 1	351,503	606,359	920,570
Trading Fees	580,978	972,678	1,378,226
Other Fees			29,045
Total Expenses	957,961	1,606,990	2,559,208
Investment income/(loss) - net	(951,500)	(1,560,971)	(2,520,910)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options	598,263	135,527	(376,937)
Net unrealized gain/(loss) on private investment companies	619,705	1,457,718	(4,729,444)
Net realized gain/(loss) on private investment companies	(1,593,919)	(921,909)	774,004
Net change in open trade equity/(deficit)	30,465	(133,881)	14,335
Net realized gain/(loss) on swap contracts	(2,448,166)
Net unrealized gain/(loss) on swap contracts	(3,088,917)	1,149,846	1,453,948
Net realized gain/(loss) on U.S. Treasury securities	25,729	12,809	(57,886)
Net unrealized gain/(loss) on U.S. Treasury securities	(5,410)	1,058	(13,623)
Trading commissions	(21,148)	(33,456)	(61,387)
Change in fair value of investments in unconsolidated trading companies	(31,150)	(140,530)	(286,285)
Net gain/(loss) on investments	(5,914,548)	1,527,182	(3,283,275)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	(6,866,048)	(33,789)	(5,804,185)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ (6,866,048)	$ (33,789)	$ (5,804,185)
The Series of 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	$ (37.30)	$ (0.40)	$ (18.33)
The Series of 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	(55.28)	4.88	(21.96)
The Series of 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	(47.69)	4.24	(18.92)
The Series of 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	(41)	3.65	(16.40)
The Series of 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	$ (47.84)	$ 4.23	$ (18.96)
The Series of Frontier Funds [Member] | Frontier Select Fund [Member]
Investment income:
Interest - net		$ (5)
Total Income/(loss)		(5)
Expenses:
Incentive Fees (rebate)
Management Fees
Risk analysis Fees
Service Fees - Class 1	62,144	102,692	132,408
Trading Fees	53,759	85,589	117,056
Other Fees			5,384
Total Expenses	115,903	188,281	254,848
Investment income/(loss) - net	(115,903)	(188,286)	(254,848)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options
Net unrealized gain/(loss) on private investment companies	66,982	(149,095)	(919,512)
Net realized gain/(loss) on private investment companies	(240,757)	170,272	(26,405)
Net change in open trade equity/(deficit)
Net realized gain/(loss) on swap contracts	(91,989)
Net unrealized gain/(loss) on swap contracts
Net realized gain/(loss) on U.S. Treasury securities	3,696	(397)	(13,509)
Net unrealized gain/(loss) on U.S. Treasury securities	(2,628)	3,636	(14,160)
Trading commissions
Change in fair value of investments in unconsolidated trading companies	82,965	(31,555)	(75,342)
Net gain/(loss) on investments	(181,731)	(7,139)	(1,048,928)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	(297,634)	(195,425)	(1,303,776)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ (297,634)	$ (195,425)	$ (1,303,776)
The Series of 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	$ (8.01)	$ (4.86)	$ (18.86)
The Series of 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	(9.74)	(4.24)	(24.55)
The Series of 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 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 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	$ (7.52)	$ (3.97)	$ (17.54)
The Series of Frontier Funds [Member] | Frontier Global Fund [Member]
Investment income:
Interest - net		$ (2)	$ 316
Total Income/(loss)		(2)	316
Expenses:
Incentive Fees (rebate)
Management Fees		38,679	487,698
Risk analysis Fees
Service Fees - Class 1	100,858	177,833	318,897
Trading Fees	186,591	278,497	307,053
Other Fees			29,844
Total Expenses	287,449	495,009	1,143,492
Investment income/(loss) - net	(287,449)	(495,011)	(1,143,176)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options
Net unrealized gain/(loss) on private investment companies	(751,136)	1,144,682
Net realized gain/(loss) on private investment companies	455,079	(168,651)
Net change in open trade equity/(deficit)
Net realized gain/(loss) on swap contracts
Net unrealized gain/(loss) on swap contracts
Net realized gain/(loss) on U.S. Treasury securities	11,678	13,736	(301,015)
Net unrealized gain/(loss) on U.S. Treasury securities	(7,981)	(19,535)	168,599
Trading commissions
Change in fair value of investments in unconsolidated trading companies	(4,495)	(353,149)	(876,164)
Net gain/(loss) on investments	(296,855)	617,083	(1,008,580)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	(584,304)	122,072	(2,151,756)
Less: Operations attributable to non-controlling interests
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	(584,304)	122,072	(2,151,756)
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member]
Investment income:
Interest - net		(6)
Total Income/(loss)		(6)
Expenses:
Incentive Fees (rebate)			697
Management Fees		7,289	120,602
Risk analysis Fees
Service Fees - Class 1	66,761	84,518	123,257
Trading Fees	104,941	118,979	142,735
Other Fees			16,035
Total Expenses	171,702	210,786	403,326
Investment income/(loss) - net	(171,702)	(210,792)	(403,326)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options
Net unrealized gain/(loss) on private investment companies	227,342	430,724	(306,862)
Net realized gain/(loss) on private investment companies	(83,882)	(146,186)	(125,458)
Net change in open trade equity/(deficit)
Net realized gain/(loss) on swap contracts	(97,745)
Net unrealized gain/(loss) on swap contracts	197,829	(67,435)	(138,924)
Net realized gain/(loss) on U.S. Treasury securities	900	3,162	(47,081)
Net unrealized gain/(loss) on U.S. Treasury securities	1,057	1,244	18,865
Trading commissions
Change in fair value of investments in unconsolidated trading companies	(16,350)	(63,386)	(101,748)
Net gain/(loss) on investments	229,151	158,123	(701,208)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	57,449	(52,669)	(1,104,534)
Less: Operations attributable to non-controlling interests	95,915	(32,695)	(67,355)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ (38,466)	$ (19,974)	$ (1,037,179)
The Series of 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	$ (1.44)	$ (2.29)	$ (21.36)
The Series of 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	2.32	1.06	(27.17)
The Series of 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	$ 2.35	$ 2.37	$ (22.50)
The Series of Frontier Funds [Member] | Frontier Global Fund [Member]
Realized and unrealized gain/(loss) on investments:
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	$ (584,304)	$ 122,072	$ (2,151,756)
NET INCREASE/(DECREASE) IN CAPITAL RESULTING FROM OPERATIONS ATTRIBUTABLE TO CONTROLLING INTERESTS	$ (584,304)	$ 122,071	$ (2,151,756)
The Series of 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	$ (20.62)	$ (20.62)	$ (27.51)
The Series of 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	(25.26)	5.65	(29.33)
The Series of 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	$ (154.43)	$ 4.51	$ (26.52)
Frontier Funds [Member]
Investment income:
Interest - net	$ 13,388	$ 98,785	$ 223,482
Total Income/(loss)	13,388	98,785	223,482
Expenses:
Incentive Fees (rebate)			137,543
Management Fees	19,600	78,678	838,497
Risk analysis Fees	5,880	5,576	85,830
Service Fees - Class 1	597,679	1,028,325	1,604,307
Due Diligence Fees	10,970
Trading Fees	1,311,400	2,216,815	3,040,016
Other Fees			125,642
Total Expenses	1,945,529	3,329,394	5,831,835
Investment income/(loss) - net	(1,932,141)	(3,230,609)	(5,608,353)
Realized and unrealized gain/(loss) on investments:
Net realized gain/(loss) on futures, forwards and options	598,263	(1,221,223)	681,508
Net unrealized gain/(loss) on private investment companies	1,738,708	3,941,383	(10,259,391)
Net realized gain/(loss) on private investment companies	(4,194,080)	(2,575,249)	544,849
Net change in open trade equity/(deficit)	30,465	568,782	(2,144,664)
Net realized gain/(loss) on swap contracts	(2,896,106)
Net unrealized gain/(loss) on swap contracts	(4,384,210)	1,429,999	2,041,028
Net realized gain/(loss) on U.S. Treasury securities	36,920	59,992	(555,676)
Net unrealized gain/(loss) on U.S. Treasury securities	3,430	(39,696)	191,566
Trading commissions	(21,148)	(37,464)	(103,639)
Net gain/(loss) on investments	(9,087,758)	2,126,524	(9,604,419)
NET INCREASE/(DECREASE) IN OWNERS' CAPITAL RESULTING FROM OPERATIONS	$ (11,019,899)	$ (1,104,086)	$ (15,212,772)

Statements of Changes in Owners

Statements of Changes in Owners' Capital Equity - USD ($)	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Limited Owners [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Limited Owners [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Limited Owners [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Managing Owner [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Managing Owner [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Non-Controlling Interests [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Diversified Fund [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Limited Owners [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Limited Owners [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Limited Owners [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Managing Owner [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Managing Owner [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Non-Controlling Interests [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Masters Fund [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Limited Owners [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Limited Owners [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Limited Owners [Member]Class 1a [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Limited Owners [Member]Class 2a [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Limited Owners [Member]Class 3a [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Managing Owner [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Managing Owner [Member]Class 2a [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Managing Owner [Member]Class 3a [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Non-Controlling Interests [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]Class 3 [Member]	The Series of Frontier Funds [Member]Frontier Long/Short Commodity Fund [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Limited Owners [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Limited Owners [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Limited Owners [Member]Class 2a [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Limited Owners [Member]Class 3a [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Limited Owners [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Managing Owner [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Managing Owner [Member]Class 2a [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Non-Controlling Interests [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Balanced Fund [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Limited Owners [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Limited Owners [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Limited Owners [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Managing Owner [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Non-Controlling Interests [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Select Fund [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Limited Owners [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Limited Owners [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Limited Owners [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Managing Owner [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Non-Controlling Interests [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Global Fund [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Limited Owners [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Limited Owners [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Limited Owners [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Managing Owner [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Non-Controlling Interests [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Class 1 [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Class 2 [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]Class 1AP [Member]	The Series of Frontier Funds [Member]Frontier Heritage Fund [Member]	Frontier Funds [Member]Limited Owners [Member]	Frontier Funds [Member]Managing Owner [Member]	Frontier Funds [Member]
Owners' Capital, Beginning balance at Dec. 31, 2017	$ 2,332,222	$ 9,629,385	$ 9,288,555	$ 3,361	$ 213,164					$ 21,466,687	$ 2,913,542	$ 3,451,256	$ 5,470,789	$ 87,344	$ 34,209					$ 11,957,140	$ 246,901	$ 2,472,994	$ 107,619	$ 408,532	$ 970,136	$ 11,999	$ 34,112	$ 1,759					$ 4,254,052	$ 38,744,003	$ 6,829,139	$ 191,276	$ 1,379,971	$ 601,247	$ 147,888	$ 338,655					$ 48,232,179	$ 5,912,980	$ 795,299	$ 23,354	$ 70,295					$ 6,801,928	$ 13,102,614	$ 1,555,723	$ 37,761	$ 153,552					$ 14,849,650	$ 5,435,871	$ 697,026	$ 6,083	$ 63,646	$ 579,074				$ 6,781,700	$ 112,604,281	$ 1,159,984	$ 113,764,265
Sale of Units (including transfers)
Redemption of Units (including transfers)	(354,496)	(988,936)	(1,747,519)		(19,000)					(3,109,951)	(882,110)	(1,614,113)	(1,765,825)	(20,000)	(8,000)					(4,290,048)	(147,466)	(344,963)	(79,178)	(151,758)	(399,521)	(4,500)	(4,501)						(1,131,887)	(8,236,418)	(1,737,916)	(90,924)	(351,542)	(178,400)	(7,000)	(52,000)					(10,654,200)	(1,052,680)	(559,336)	(18,274)	(11,000)					(1,641,290)	(3,379,980)	(1,092,250)		(29,000)					(4,501,230)	(1,182,575)	(18,107)	(4,081)	(7,000)					(1,211,763)	(26,433,650)	(162,000)	(26,595,650)
Change in control of ownership - Trading Companies
Operations attributable to non-controlling interests																																																																				(67,355)				(67,355)
Payment made by Related Party																																		32,070	13,964	100	137	32							46,303										(20,121)	31,748							11,627										11,636		11,636
Payment made by the Managing Owner																																																																									46,303		46,303
Transfer of Units In(Out)																																		(1,232)			49,978	1,232								(1,232)		1,232							49,978	(49,978)
Net increase/(decrease) in Owners' Capital resulting from operations attributable to controlling interests	(274,170)	(970,700)	(933,262)	(356)	(21,738)					(2,200,226)	(546,954)	(595,533)	(930,303)	(15,979)	(6,190)					(2,094,959)	(21,337)	(336,616)	(8,390)	(90,789)	(208,694)	(1,501)	(9,127)	(506)					(676,958)	(4,835,733)	(701,833)	(12,376)	(135,051)	(67,767)	(15,867)	(35,558)					(5,804,185)	(1,149,938)	(136,496)	(4,415)	(12,927)					(1,303,776)	(1,997,047)	(132,076)	(5,679)	(16,954)					(2,151,756)	(921,571)	(104,927)	(996)	(9,685)					(1,037,179)	(15,067,383)	(146,389)	(15,213,772)
Owners' Capital, Ending balance at Dec. 31, 2018	$ 1,703,556	$ 7,669,749	$ 6,607,774	$ 3,005	$ 172,426					16,156,510	$ 1,484,478	$ 1,241,610	$ 2,774,661	$ 51,365	$ 20,019					5,572,133	$ 78,098	$ 1,791,417	$ 20,051	$ 165,985	$ 361,921	$ 5,998	$ 20,484	$ 1,253					2,445,207	$ 25,703,922	$ 4,403,354	$ 88,076	$ 893,515	$ 355,112	$ 125,021	$ 251,097					31,820,097	$ 3,709,130	$ 99,467	$ 1,897	$ 46,368					3,856,862	$ 7,755,444	$ 313,167	$ 32,082	$ 107,598					8,208,291	$ 3,331,725	$ 573,992	$ 1,006	$ 46,961	511,718				4,465,402	71,161,187	851,595	72,012,782
Owners' Capital - Units, Beginning balance at Dec. 31, 2017	20,035	71,229	73,905	25	1,696						25,393	25,898	43,979	655	275						2,131	20,355	1,323	4,366	9,900	104	364	18						284,956	33,657	1,089	7,877	3,993	729	1,926						65,502	5,992	234	530						82,367	7,186	214	709						44,855	3,856	45	377
Owners' Capital - Units, Sale of Units (including transfers)
Owners' Capital - Units, Redemption of Units (including transfers)	(3,374)	(7,760)	(15,234)		(165)						(9,097)	(14,366)	(16,442)	(178)	(76)						(1,341)	(3,072)	(971)	(1,871)	(4,720)	(43)	(57)							(66,442)	(9,321)	(527)	(2,159)	(1,346)	(38)	(325)						(13,563)	(5,073)	(211)	(101)						(23,421)	(5,513)		(134)						(11,481)	(93)	(36)	(69)
Owners' Capital - Units, Ending balance at Dec. 31, 2018	16,661	63,469	58,671	25	1,531						16,296	11,532	27,537	477	199						790	17,283	352	2,495	5,180	61	307	18						218,514	24,294	562	5,718	2,643	691	1,601						51,939	919	23	429						58,946	1,673	214	575						33,374	3,763	9	308
Net asset value per unit, Beginning balance at Dec. 31, 2017																					$ 115.81	$ 121.50	$ 81.35	$ 93.59	$ 97.99									$ 135.96	$ 202.90	$ 175.77	$ 175.18	$ 150.56								$ 90.27	$ 132.73	$ 100.02							$ 159.08	$ 216.5	$ 176.44							$ 121.19	$ 179.7	$ 134.28
Change in net asset value per unit																					(16.99)	(17.84)	(24.55)	(27.07)	(28.16)									(18.33)	(21.96)	(18.96)	(18.92)	(18.33)								(18.86)	(24.54)	(17.54)							(27.51)	(29.33)	(26.52)							(21.37)	(27.17)	(22.50)
Net asset value per unit, Ending balance at Dec. 31, 2018	$ 102.25	$ 120.84	$ 112.62								$ 91.10	$ 107.68	$ 100.77								$ 98.82	$ 103.66	$ 56.8	$ 66.52	$ 69.83									$ 117.63	$ 180.94	$ 156.81	$ 156.26	$ 134.16								$ 71.41	$ 108.18	$ 82.48							$ 131.57	$ 187.17	$ 149.92							$ 99.83	$ 152.53	$ 111.78
Sale of Units (including transfers)
Redemption of Units (including transfers)	$ (269,710)	$ (2,063,288)	$ (1,796,772)		$ (57,500)					(4,187,270)	$ (1,450,004)	$ (198,224)	$ (1,032,846)	$ (33,750)	$ (8,000)					(2,722,824)	$ (32,587)	$ (519,520)	$ (4,858)	$ (62,516)	$ (85,853)	$ (500)	$ (9,000)						(714,834)	$ (7,737,266)	$ (1,238,298)	$ (45,814)	$ (16,647)	$ (122,927)	$ (53,000)	$ (78,594)					(9,292,456)	$ (795,619)	$ (34,192)		$ (15,000)					(844,811)	$ (3,388,723)	$ (32,395)		$ (61,000)					(3,482,118)	$ (995,044)	$ (94,154)		$ (18,500)					(1,107,697)	(21,992,853)	(359,250)	(22,352,103)
Operations attributable to non-controlling interests
Payment made by Related Party
Payment made by the Managing Owner
Transfer of Units In(Out)
Net increase/(decrease) in Owners' Capital resulting from operations attributable to controlling interests	(130,651)	(8,633)	168,639	18	1,007					30,380	(21,680)	(205,621)	(376,606)	(4,572)	(2,791)					(611,269)	(8,996)	(280,269)	(3,746)	(29,504)	(68,917)	(968)	(3,623)	(260)					(396,083)	(169,056)	123,049	1,786	23,714	6,359	1,727	(21,370)					(33,789)	(198,460)	(4,365)	8,937	(1,537)					(195,425)	105,259	12,387	965	3,460					122,071	(41,058)	13,626	7,327	132					(19,974)	(1,099,715)	(4,371)	(1,104,086)
Owners' Capital, Ending balance at Dec. 31, 2019	$ 1,303,195	$ 5,597,828	$ 4,979,641	$ 3,023	$ 115,933					11,999,620	$ 12,794	$ 837,765	$ 1,365,209	$ 13,043	$ 9,228					2,238,039	$ 36,515	$ 991,828	$ 11,447	$ 73,965	$ 207,151	$ 4,530	$ 7,861	$ 993					1,334,290	$ 17,797,600	$ 3,288,105	$ 44,048	$ 900,583	$ 238,544	$ 73,748	$ 151,133					22,493,761	$ 2,715,051	$ 60,910	$ 10,834	$ 29,831					2,816,626	$ 4,471,980	$ 293,159	$ 33,047	$ 50,058					4,848,244	$ 2,295,623	$ 493,464	$ 8,333	$ 28,593	479,024				3,305,037	48,068,619	487,974	48,556,593
Owners' Capital - Units, Sale of Units (including transfers)
Owners' Capital - Units, Redemption of Units (including transfers)	(3,771)	(17,427)	(14,839)		(511)						(16,119)	(1,922)	(10,844)	(328)	(86)						(343)	(5,702)	(93)	(1,086)	(1,435)	(5)	(158)							(66,700)	(6,599)	(288)	(107)	(912)	(294)	(663)						(11,146)	(333)	115	(141)						(24,943)	(153)		(315)						(9,838)	(550)	64	(122)
Owners' Capital - Units, Ending balance at Dec. 31, 2019	12,890	46,042	43,832	25	1,021		12,890	46,067	44,853		177	9,610	16,693	149	113		177	9,759	16,806		447	11,581	259	1,409	3,745	56	149	18			503	11,581		151,814	17,695	274	5,611	1,731	397	938		151,814	18,092	1,731		40,793	585	138	288		40,793	873	138		34,003	1,520	214	260		34,003	1,780	214		23,536	3,213	73	186		23,536	3,399	73
Change in net asset value per unit	$ (1.15)	$ 0.74	$ 0.98								$ (18.82)	$ (20.50)	$ (18.99)								$ (17.22)	$ (18.02)	$ (12.60)	$ (13.97)	$ (14.52)									$ (0.40)	$ 4.88	$ 4.23	$ 4.24	$ 3.65								$ (4.85)	$ 4.23	$ (3.97)							$ (0.05)	$ 5.65	$ 4.51							$ (2.29)	$ 1.06	$ 2.37
Net asset value per unit, Ending balance at Dec. 31, 2019	$ 101.10	$ 121.58	$ 113.61								$ 72.28	$ 87.18	$ 81.78								$ 81.6	$ 85.64	$ 44.2	$ 52.55	$ 55.31									$ 117.23	$ 185.82	$ 161.04	$ 160.5	$ 137.81								$ 66.56	$ 103.94	$ 78.51							$ 131.52	$ 192.82	$ 154.43							$ 97.54	$ 153.59	$ 114.15
Sale of Units (including transfers)
Redemption of Units (including transfers)		(3,958,812)	(987,627)		(30,900)					(4,977,339)		(379,078)	(398,119)	(4,200)						(781,397)	(7,667)	(66,892)		(1,193)	13,411	(800)							(89,964)	$ (2,911,348)	$ (400,453)		$ (121,641)	$ (54,192)		$ (29,800)					(3,517,434)	(850,467)	(5,197)		(10,200)					(865,864)	(1,174,215)	$ (119,499)	(25,277)	(14,300)					(1,333,291)	(94,455)	(303,112)		(4,700)					(402,266)	(11,872,655)	(94,900)	(4,700)
Payment made by Related Party
Payment made by the Managing Owner
Transfer of Units In(Out)	(987,405)		987,405																				(11,267)		11,267
Net increase/(decrease) in Owners' Capital resulting from operations attributable to controlling interests	161,530	(1,175,004)	(1,471,337)	(811)	(30,628)					(2,839,310)	(3,054)	(201,014)	(254,408)	(2,578)	(2,061)					(463,115)	1,486	51,835	(180)	3,811	11,347	209	413	55					68,977	(5,455,720)	(981,293)	(13,087)	(271,794)	(76,299)	(21,938)	(45,917)					(6,866,048)	(289,256)	(4,944)	(1,013)	(2,421)					(297,634)	(555,793)	(16,349)	(7,770)	(4,392)					(584,304)	(32,016)	(6,787)	127	212	(479,024)				(38,466)	(10,910,042)	(109,857)	(13,348,392)
Owners' Capital, Ending balance at Dec. 31, 2020	$ 154,260	$ 464,012	$ 3,508,082	$ 2,212	$ 54,405					$ 4,182,971	$ 9,740	$ 257,673	$ 712,682	$ 6,265	$ 7,167					$ 993,527	$ 30,334	$ 976,771		$ 76,583	$ 216,354	$ 3,939	$ 8,274	$ 1,048					$ 1,313,303	$ 9,430,532	$ 1,906,359	$ 30,961	$ 507,148	$ 108,053	$ 51,810	$ 75,416					$ 12,110,279	$ 1,575,328	$ 50,769	$ 9,821	$ 17,210					$ 1,653,128	$ 2,741,972	$ 157,311		$ 31,366					$ 2,930,649	$ 2,169,152	$ 183,565	$ 8,460	$ 24,105					$ 2,385,282	$ 25,285,922	$ 283,217	$ 25,834,156
Owners' Capital - Units, Sale of Units (including transfers)
Owners' Capital - Units, Redemption of Units (including transfers)	(10,768)	(40,826)	(1,732)		(368)							(5,794)	(5,473)	(56)							(94)	(753)	(259)	(23)	(38)	(10)								(33,823)	(3,092)		(1,116)	(615)		(272)						(13,887)	(46)		(105)						(9,279)	(581)	(214)	(73)						(964)	(2,036)	0	(31)
Owners' Capital - Units, Ending balance at Dec. 31, 2020	2,122	5,217	42,100	25	653		2,122	5,241	42,754		177	3,816	11,220	93	113		177	3,908	11,333		353	10,828	0	1,386	3,707	46	149	18			399	10,828		117,991	14,603	274	4,495	1,116	397	666		117,991	15,000	1,116		26,906	539	138	183		26,906	722	138		24,724	939	0	187		24,725	1,126			22,572	1,177	73	155		22,572	1,332	73
Change in net asset value per unit	$ (28.42)	$ (32.63)	$ (30.28)								$ (17.10)	$ (19.64)	$ (18.26)								$ 4.39	$ 4.57	$ (44.20)	$ 2.74	$ 3.06									$ (37.30)	$ (55.28)	$ (47.84)	$ (47.69)	$ (41)								$ (8.01)	$ (9.74)	$ (7.52)							$ (20.62)	$ (25.26)	$ (154.43)							$ (1.44)	$ 2.32	$ 2.35
Net asset value per unit, Ending balance at Dec. 31, 2020	$ 72.68	$ 88.95	$ 83.33								$ 55.18	$ 67.54	$ 63.52								$ 85.99	$ 90.21		$ 55.29	$ 58.37									$ 79.93	$ 130.54	$ 113.20	$ 112.81	$ 96.81								$ 58.55	$ 94.2	$ 70.99							$ 110.9	$ 167.56								$ 96.1	$ 155.92	$ 116.5

Statements of Cash Flows

Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	$ (2,839,310)	$ 30,380	$ (2,200,226)
Change in:
Net change in ownership allocation of U.S. Treasury securities	3,801,487	1,891,523	(1,138,048)
Net unrealized (gain)/loss on swap contracts	1,537,399	(464,169)	(643,941)
Net unrealized (gain)/loss on U.S. Treasury securities	(23,758)	19,045	(33,137)
Net realized (gain)/loss on U.S. Treasury securities	14,579	(14,359)	51,245
Net unrealized (gain)/loss on private investment companies	(946,785)	(907,504)	2,307,071
Net realized (gain)/loss on private investment companies	1,549,052	730,551	(278,881)
(Purchases) of swap contracts	(4,469,147)
Sales of swap contracts	4,870,025
Reduction of collateral in Swap contracts	4,446,306		1,099,999
Sales of U.S. Treasury securities	(1,888,716)	1,747,952	2,612,077
(Purchases) of U.S. Treasury securities	(2,231,818)	(2,190,500)	(2,304,284)
U.S. Treasury interest and premium paid/amortized	441	(5)	25,935
(Purchases) of Private Investment Companies	(2,163,542)	(4,995,273)	(3,845,201)
Sale of Private Investment Companies	7,222,405	6,950,956	5,234,058
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	7,481	1,136,760	1,064,300
Interest receivable	(6,507)	29,990	(16,890)
Receivable from related parties	6,561	(11,453)
Other assets	5,700	(177,606)
Due to broker
Redemptions receivable from private investment companies	140,020	6,380
Incentive fees payable to Managing Owner		(3,875)	(19,227)
Management fees payable to Managing Owner			(174)
Interest payable to Managing Owner
Trading fees payable to Managing Owner	(23,301)	(8,950)	(16,361)
Service fees payable to Managing Owner	(3,007)	(1,106)	884
Subscriptions in advance for service fee rebates	119	2,101	20,430
Other liabilities	3,110		(26,873)
Net cash provided by (used in) operating activities	9,008,794	3,770,838	1,892,756
Cash Flows from Financing Activities:
Payment for redemption of units	(4,977,342)	(4,187,270)	(3,109,951)
Proceeds from sale of units
Advance on unrealized Swap Appreciation	(4,000,000)		1,500,000
Change in owner redemptions payable
Net cash provided by (used in) financing activities	(8,977,342)	(4,187,270)	(1,609,951)
Net increase (decrease) in cash and cash equivalents	31,452	(416,432)	282,805
Cash and cash equivalents, beginning of period	56,263	472,695	189,890
Cash and cash equivalents, end of period	87,715	56,263	472,695
The Series of Frontier Funds [Member] | Frontier Masters Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	(463,115)	(611,269)	(2,094,959)
Change in:
Net change in ownership allocation of U.S. Treasury securities	346,666	651,757	1,757,672
Net unrealized (gain)/loss on swap contracts
Net unrealized (gain)/loss on U.S. Treasury securities	4,357	9,501	15,571
Net realized (gain)/loss on U.S. Treasury securities	(8,759)	(15,346)	45,198
Net unrealized (gain)/loss on private investment companies	(393,123)	162,637	1,197,208
Net realized (gain)/loss on private investment companies	754,772	(159,651)	75,682
(Purchases) of swap contracts
Sales of swap contracts
Reduction of collateral in Swap contracts
Sales of U.S. Treasury securities	530,370	632,031	1,784,721
(Purchases) of U.S. Treasury securities	(852,963)	(1,175,606)	(2,106,696)
U.S. Treasury interest and premium paid/amortized	2,476	4,656	14,162
(Purchases) of Private Investment Companies	(1,178,274)	(1,894,552)	(3,476,046)
Sale of Private Investment Companies	2,001,031	4,353,896	5,948,998
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	10,098	764,083	726,054
Interest receivable	460	2,217	29,657
Receivable from related parties	(266)
Other assets			2,974
Due to broker
Redemptions receivable from private investment companies	(24,837)
Incentive fees payable to Managing Owner
Management fees payable to Managing Owner		(8,347)	(602)
Interest payable to Managing Owner
Trading fees payable to Managing Owner	(6,213)	(16,311)	(21,147)
Service fees payable to Managing Owner	(134)	(1,546)	(1,820)
Subscriptions in advance for service fee rebates	184	3,441	28,100
Other liabilities	(328)	499
Net cash provided by (used in) operating activities	722,402	2,702,090	3,924,727
Cash Flows from Financing Activities:
Payment for redemption of units	(781,398)	(2,722,825)	(4,290,048)
Proceeds from sale of units
Advance on unrealized Swap Appreciation
Change in owner redemptions payable	38,128
Net cash provided by (used in) financing activities	(743,270)	(2,722,825)	(4,290,048)
Net increase (decrease) in cash and cash equivalents	(20,868)	(20,735)	(365,321)
Cash and cash equivalents, beginning of period	25,639	46,374	411,695
Cash and cash equivalents, end of period	4,771	25,639	46,374
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	68,977	(396,083)	(676,958)
Change in:
Net change in ownership allocation of U.S. Treasury securities	(1,347,014)	(392,620)	(181,417)
Net unrealized (gain)/loss on swap contracts	(44,277)	116,581	(82,062)
Net unrealized (gain)/loss on U.S. Treasury securities	1,009	(2,447)	(14,319)
Net realized (gain)/loss on U.S. Treasury securities	(737)	(977)	40,742
Net unrealized (gain)/loss on private investment companies	(283,384)	(198,426)	403,889
Net realized (gain)/loss on private investment companies	405,836	428,509	240,941
(Purchases) of swap contracts	(115,000)
Sales of swap contracts	594,898
Reduction of collateral in Swap contracts	(73,100)
Sales of U.S. Treasury securities	2,003,499	1,130,160	1,492,432
(Purchases) of U.S. Treasury securities	(1,054,832)	(594,391)	(938,178)
U.S. Treasury interest and premium paid/amortized	4,010	2,018	13,128
(Purchases) of Private Investment Companies	(206,942)	(1,222,587)	(1,544,848)
Sale of Private Investment Companies	333,194	1,734,988	2,189,349
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	(3,025)	13,452	93,346
Prepaid service fees
Interest receivable	(7,784)	2,876	7,953
Receivable from related parties	(5,205)
Advance on unrealized Swap Appreciation	(115,000)
Other assets			5,122
Due to broker
Redemptions receivable from private investment companies	(1,251)
Incentive fees payable to Managing Owner		60,871	(3,789)
Management fees payable to Managing Owner
Interest payable to Managing Owner	87	(1,838)	(103)
Trading fees payable to Managing Owner	(1,187)	(51)	(3,819)
Service fees payable to Managing Owner	18		(121)
Subscriptions in advance for service fee rebates	173
Other liabilities	2,641	887
Net cash provided by (used in) operating activities	155,604	680,922	1,041,288
Cash Flows from Financing Activities:
Payment for redemption of units	(89,964)	(714,834)	(1,131,887)
Proceeds from sale of units
Advance on unrealized Swap Appreciation		6,585
Change in owner redemptions payable	(6,585)
Net cash provided by (used in) financing activities	(96,549)	(708,249)	(1,131,887)
Net increase (decrease) in cash and cash equivalents	59,055	(27,328)	(90,600)
Cash and cash equivalents, beginning of period	34,272	61,600	152,200
Cash and cash equivalents, end of period	93,327	34,272	61,600
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	(6,866,048)	(33,789)	(5,804,185)
Change in:
Net change in open trade equity, at fair value	15,744	104,475	(42,107)
Net realized gain/(loss) on futures, forwards and options
Net change in options purchased, at fair value
Due from Managing Owner
Net change in ownership allocation of U.S. Treasury securities	(220,865)	1,464,296	851,183
Net unrealized (gain)/loss on swap contracts	3,088,917	(1,149,846)	(1,453,948)
Net realized gain/(loss) on swap contracts	2,448,166	0	0
Net unrealized (gain)/loss on U.S. Treasury securities	5,410	(1,058)	13,623
Net realized (gain)/loss on U.S. Treasury securities	(25,729)	(12,809)	57,886
Net unrealized (gain)/loss on private investment companies	(619,705)	(1,457,718)	4,729,444
Net realized (gain)/loss on private investment companies	1,593,919	921,909	(774,004)
(Purchases) of swap contracts	(7,355,251)
Sales of swap contracts	7,586,366
Reduction of collateral in Swap contracts	6,176,555		1,999,999
Sales of U.S. Treasury securities	3,915,124	1,030,440	2,911,825
(Purchases) of U.S. Treasury securities	(4,746,241)	(2,613,278)	(3,335,991)
U.S. Treasury interest and premium paid/amortized	6,461	46,019	41,873
(Purchases) of Private Investment Companies	(4,848,308)	(8,169,632)	(8,275,992)
Sale of Private Investment Companies	7,155,734	17,749,875	11,968,285
Increase and/or decrease in:
Receivable from futures commission merchants	2,292,269	157,058	4,774,797
Investments in unconsolidated trading companies, at fair value	1,112	1,694,132	1,433,177
Prepaid service fees
Interest receivable	(21,201)	(1,726)	10,548
Control of ownership of trading companies
Control of ownership of Private Investment Companies
Receivable from other series
Receivable from related parties	(14,602)
Other assets		(380,111)	(40,189)
Redemptions receivable from private investment companies	324,638
Incentive fees payable to Managing Owner		0	2,452
Management fees payable to Managing Owner	59	(5,122)	(1,038)
Interest payable to Managing Owner	1,271	(1,385)	(39,098)
Trading fees payable to Managing Owner	(32,285)	(31,591)	(31,358)
Service fees payable to Managing Owner	(20,254)	(15,156)	241
Risk analysis fees payable	1,048	(662)
Payables to related parties		0	184,106
Subscriptions in advance for service fee rebates	27,157	61,504	258,194
Other liabilities	6,886	2,372	(155,425)
Net cash provided by (used in) operating activities	9,876,346	9,358,197	9,284,298
Cash Flows from Financing Activities:
Payment for redemption of units	(3,517,435)	(9,292,547)	(10,654,364)
Proceeds from sale of units
Payment made by the Managing Owner			46,303
Pending owner additions
Advance on unrealized Swap Appreciation	(6,176,555)		1,250,000
Change in owner redemptions payable	(39,059)	15,300	(53,013)
Net cash provided by (used in) financing activities	(9,733,049)	(9,277,247)	(9,411,074)
Net increase (decrease) in cash and cash equivalents	143,297	80,950	(126,776)
Cash and cash equivalents, beginning of period	118,506	37,556	164,332
Cash and cash equivalents, end of period	261,803	118,506	37,556
The Series of Frontier Funds [Member] | Frontier Select Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	(297,634)	(195,425)	(1,303,776)
Change in:
Net change in open trade equity, at fair value
Net realized gain/(loss) on futures, forwards and options
Net change in options purchased, at fair value
Due from Managing Owner
Net change in ownership allocation of U.S. Treasury securities	(826,946)	(1,015,753)	658,029
Net unrealized (gain)/loss on swap contracts
Net realized gain/(loss) on swap contracts		0	0
Net unrealized (gain)/loss on U.S. Treasury securities	2,628	(3,636)	14,160
Net realized (gain)/loss on U.S. Treasury securities	(3,696)	397	13,509
Net unrealized (gain)/loss on private investment companies	(66,982)	149,095	919,512
Net realized (gain)/loss on private investment companies	240,757	(170,272)	26,405
(Purchases) of swap contracts
Sales of swap contracts
Reduction of collateral in Swap contracts
Sales of U.S. Treasury securities	2,403,975	2,633,295	631,678
(Purchases) of U.S. Treasury securities	(1,467,357)	(1,640,515)	(944,467)
U.S. Treasury interest and premium paid/amortized		(5)	9,132
(Purchases) of Private Investment Companies	(2,136,722)	(1,279,910)	(2,612,993)
Sale of Private Investment Companies	2,508,522	2,368,922	3,994,230
Increase and/or decrease in:
Receivable from futures commission merchants
Investments in unconsolidated trading companies, at fair value	505,355	17,825	147,683
Prepaid service fees
Interest receivable	2,268	(570)	7,462
Control of ownership of trading companies
Control of ownership of Private Investment Companies
Receivable from other series
Receivable from related parties
Other assets
Redemptions receivable from private investment companies	(67,876)
Incentive fees payable to Managing Owner		0	0
Management fees payable to Managing Owner
Interest payable to Managing Owner	179		(1,358)
Trading fees payable to Managing Owner	(2,067)	(1,812)	(7,086)
Service fees payable to Managing Owner	(3,197)	(1,669)	(6,168)
Risk analysis fees payable
Payables to related parties	26,129	0	0
Subscriptions in advance for service fee rebates	2,568	5,733	11,162
Other liabilities	(8,509)	8,509	(5,725)
Net cash provided by (used in) operating activities	811,395	874,209	1,551,389
Cash Flows from Financing Activities:
Payment for redemption of units	(865,865)	(844,811)	(1,641,290)
Proceeds from sale of units
Payment made by the Managing Owner
Pending owner additions
Advance on unrealized Swap Appreciation
Change in owner redemptions payable	(6,875)	6,875
Net cash provided by (used in) financing activities	(872,740)	(837,936)	(1,641,290)
Net increase (decrease) in cash and cash equivalents	(61,345)	36,273	(89,901)
Cash and cash equivalents, beginning of period	61,345	25,072	114,973
Cash and cash equivalents, end of period		61,345	25,072
The Series of Frontier Funds [Member] | Frontier Global Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	(584,304)	122,072	(2,151,756)
Change in:
Net change in open trade equity, at fair value
Net change in ownership allocation of U.S. Treasury securities	(223,579)	(2,166,060)	(1,958,364)
Net unrealized (gain)/loss on swap contracts
Net realized gain/(loss) on swap contracts
Net unrealized (gain)/loss on U.S. Treasury securities	7,981	19,535	(168,599)
Net realized (gain)/loss on U.S. Treasury securities	(11,678)	(13,736)	301,015
Net unrealized (gain)/loss on private investment companies	751,136	(1,144,682)
Net realized (gain)/loss on private investment companies	(455,079)	168,651
(Purchases) of swap contracts
Sales of swap contracts
Reduction of collateral in Swap contracts
Sales of U.S. Treasury securities	877,516	8,701,245	11,956,435
(Purchases) of U.S. Treasury securities	(629,240)	(3,463,172)	(7,726,537)
U.S. Treasury interest and premium paid/amortized		(2)	137,325
(Purchases) of Private Investment Companies	(556,666)	(4,899,753)
Sale of Private Investment Companies	2,214,920	852,817
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	10,735	4,280,256	3,695,499
Interest receivable	438	63,454	47,335
Receivable from related parties	(319)		58,146
Advance on unrealized Swap Appreciation
Redemptions receivable from private investment companies
Management fees payable to Managing Owner		(42,705)	(10,334)
Interest payable to Managing Owner	270	(8,068)	(12,868)
Trading fees payable to Managing Owner	(10,691)	(1,813)	(19,220)
Service fees payable to Managing Owner	(4,915)	(6,540)	(8,911)
Due to Managing Owner			(152,219)
Payables to related parties
Subscriptions in advance for service fee rebates	4,646	16,744	133,281
Other liabilities	(8,338)	8,543	(82,265)
Net cash provided by (used in) operating activities	1,382,833	2,486,786	4,037,963
Cash Flows from Financing Activities:
Payment for redemption of units	(1,333,292)	(3,482,119)	(4,501,230)
Payment made by Related Party			11,627
Change in non-controlling interest
Advance on unrealized Swap Appreciation
Change in owner redemptions payable	(71,379)	71,379
Net cash provided by (used in) financing activities	(1,404,671)	(3,410,740)	(4,489,603)
Net increase (decrease) in cash and cash equivalents	(21,838)	(923,954)	(451,640)
Cash and cash equivalents, beginning of period	27,532	951,485	1,403,125
Cash and cash equivalents, end of period	5,694	27,532	951,485
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	57,449	(52,669)	(1,104,534)
Change in:
Net change in open trade equity, at fair value
Net change in ownership allocation of U.S. Treasury securities	(1,547,348)	(438,164)	29,426
Net unrealized (gain)/loss on swap contracts	(197,829)	67,436	138,924
Net realized gain/(loss) on swap contracts	97,745
Net unrealized (gain)/loss on U.S. Treasury securities	(1,057)	(1,244)	(18,865)
Net realized (gain)/loss on U.S. Treasury securities	(900)	(3,162)	47,081
Net unrealized (gain)/loss on private investment companies	(227,342)	(430,724)	306,863
Net realized (gain)/loss on private investment companies	83,882	146,186	125,458
(Purchases) of swap contracts	(978,809)
Sales of swap contracts	1,491,966
Reduction of collateral in Swap contracts	2,474,936
Sales of U.S. Treasury securities	2,493,564	2,403,609	1,878,837
(Purchases) of U.S. Treasury securities	(940,190)	(1,595,028)	(1,357,069)
U.S. Treasury interest and premium paid/amortized		(6)	23,530
(Purchases) of Private Investment Companies	(1,168,275)	(1,165,676)	(713,437)
Sale of Private Investment Companies	1,203,951	1,358,415	886,228
Increase and/or decrease in:
Investments in unconsolidated trading companies, at fair value	16,011	707,795	820,288
Interest receivable	111	7,564	11,497
Receivable from related parties	(845)
Advance on unrealized Swap Appreciation	(1,900,000)
Redemptions receivable from private investment companies
Management fees payable to Managing Owner		(9,201)	(4,270)
Interest payable to Managing Owner	(27)	(1,072)	(1,370)
Trading fees payable to Managing Owner	(3,465)	981	(5,514)
Service fees payable to Managing Owner	(568)	(1,322)	(4,799)
Due to Managing Owner
Payables to related parties			(697)
Subscriptions in advance for service fee rebates	6,073	10,973	46,159
Other liabilities	(948)	1,488	(16,037)
Net cash provided by (used in) operating activities	862,171	1,006,179	1,087,699
Cash Flows from Financing Activities:
Payment for redemption of units	(402,266)	(1,107,696)	(1,211,763)
Payment made by Related Party
Change in non-controlling interest	(479,025)
Change in owner redemptions payable	(9,735)	9,735
Net cash provided by (used in) financing activities	(891,026)	(1,097,961)	(1,211,763)
Net increase (decrease) in cash and cash equivalents	(28,855)	(91,782)	(124,064)
Cash and cash equivalents, beginning of period	44,011	135,096	259,161
Cash and cash equivalents, end of period	15,156	44,011	135,096
Frontier Funds [Member]
Cash Flows from Operating Activities:
Net increase/(decrease) in capital resulting from operations	(11,019,899)	(1,104,086)	(15,213,772)
Change in:
Net change in open trade equity, at fair value	15,744	(568,782)	1,966,603
Net unrealized (gain)/loss on swap contracts	4,384,210	(1,429,998)	(2,041,029)
Net realized gain/(loss) on swap contracts	2,793,799
Net unrealized (gain)/loss on U.S. Treasury securities	(3,430)	39,696	(191,566)
Net realized (gain)/loss on U.S. Treasury securities	(36,920)	(59,992)	556,676
Net unrealized (gain)/loss on private investment companies	(1,756,307)	(3,941,384)	10,259,391
Net realized (gain)/loss on private investment companies	4,194,080	2,575,249	(544,849)
(Purchases) of swap contracts	(12,918,208)
Sales of swap contracts	14,543,253
Reduction of collateral in Swap contracts	12,776,810
Sales of U.S. Treasury securities	10,335,331	18,278,732	23,268,005
(Purchases) of U.S. Treasury securities	(11,922,643)	(13,272,491)	(18,713,224)
U.S. Treasury interest and premium paid/amortized	13,388	85,741	292,200
(Purchases) of Private Investment Companies	(12,258,403)	(23,995,709)	(24,123,914)
Sale of Private Investment Companies	22,639,756	36,009,558	34,776,548
Increase and/or decrease in:
Receivable from futures commission merchants	2,292,269	8,729,606	9,328,754
Prepaid service fees			24,251
Interest receivable	(32,215)	103,805	97,562
Receivable from related parties	(14,676)	(11,453)	58,146
Advance on unrealized Swap Appreciation	(12,191,555)
Other assets	5,700	(557,717)
Redemptions receivable from private investment companies	370,694
Incentive fees receivable to Managing Owner		67,948	(63,902)
Incentive fees payable to Managing Owner
Management fees payable to Managing Owner, net of change in receivable	59	(69,250)	(12,927)
Interest payable to Managing Owner	1,780	(10,525)	(15,155)
Trading fees payable to Managing Owner	(79,209)	(61,334)	(112,244)
Service fees payable to Managing Owner	(32,057)	(27,390)	(52,293)
Due from Managing Owner			31,887
Due to Managing Owner
Risk analysis fees payable	1,048	(19,097)	1,986
Payables to related parties	26,129
Subscriptions in advance for service fee rebates	40,920	100,716	497,326
Other liabilities	(5,486)	18,075	(274,980)
Net cash provided by (used in) operating activities	12,163,962	20,879,918	22,525,229
Cash Flows from Financing Activities:
Payment for redemption of capital	(11,967,562)	(22,352,103)	(26,595,650)
Payment made by Related Party			11,636
Payment made by the Managing Owner			46,303
Advance on unrealized Swap Appreciation			3,099,998
Redemptions payable	(95,502)	109,874	(53,014)
Net cash provided by (used in) financing activities	(12,063,064)	(22,242,229)	(23,490,727)
Net increase (decrease) in cash and cash equivalents	100,898	(1,362,311)	(965,498)
Cash and cash equivalents, beginning of period	367,568	1,729,879	2,695,377
Cash and cash equivalents, end of period	$ 468,466	$ 367,568	$ 1,729,879

Organization and Purpose

Organization and Purpose	12 Months Ended
	Dec. 31, 2020
The Series of 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 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 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 December 31, 2020, 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. As of December 31, 2019 and 2018, Frontier Global Fund has invested a portion of its assets in a single Trading Company , and a single Trading Advisor manages 100% of the assets invested in such trading company. 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 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 December 31, 2020, 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. Effective March 12, 2020, Emil Van Essen and Transtrend BV ceased to act as a commodity trading advisor to the Trust. Effective April 1, 2020, Landmark Trading Company ceased to act as a commodity trading advisor to the Trust. Effective May 30, 2020, BH-DG Systematic Trading LLP ceased to act as a commodity trading advisor to the Trust. Effective July 20, 2020, Doherty Advisors, LLC ceased to act as a commodity trading advisor to the Trust. Effective December 21, 2020, JE Moody & Company, H2O AM LLP and Crabel Capital Management, LLC ceased to act as a commodity trading advisor to the Trust. 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	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Significant Accounting Policies	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. As of December 31, 2020, and 2019, the consolidated statements of financial condition of Frontier Balanced Fund included the assets and liabilities of its wholly owned interests in Frontier Trading Company I, LLC and Frontier Trading Company XXXIV, LLC. For the year ended December 31, 2020, 2019 and 2018 the consolidated statements of operations of Frontier Balanced Fund included the earnings of its wholly owned interest in Frontier Trading Company I, LLC and Frontier Trading Company XXXIV, LLC. As of December 31, 2020, and 2019, the consolidated statements of financial condition of Frontier Long/Short Commodity Fund included the assets and liabilities of its wholly owned Trading Company, Frontier Trading Company XXXVII, LLC. For the years ended December 31, 2020, 2019 and 2018, the consolidated statements of operations of Frontier Long/Short Commodity Fund included the earnings of its wholly owned Trading Company listed above. As of December 31, 2020, and 2019, the consolidated statements of financial condition of Frontier Diversified Fund included the assets and liabilities of its wholly owned Frontier Trading Company XXXV, LLC. For the years ended December 31, 2020, 2019, and 2018 the consolidated statements of operations of Frontier Diversified Fund included the earnings of its wholly owned Trading Company listed above. As of and for the years ended December 31, 2020, 2019, and 2018, the consolidated statements of financial condition and statement of operations of Frontier Heritage Fund included the assets and liabilities, and earnings, respectively, of its majority owned Trading Company, Frontier Trading Company XXXIX, LLC. For the year ended December 31, 2020, 2019 and 2018, the consolidated statements of operations of Frontier Select Fund included the earnings of its majority owned Trading Company. For the year ended December 31, 2019 and 2018, the consolidated statements of operations of Frontier Global Fund include the earnings of its majority owned Trading Company, Frontier Trading Company II, LLC from January 1, 2017 through December 14, 2017. As of and for the years ended December 31, 2019, 2018 and 2017, Frontier Master Fund did not have a majority interest in any Trading Company. Each of the Series has invested in Frontier Trading Company XXXVIII, LLC on the same basis as its ownership in the cash pool. Frontier Trading Company XXXVIII, LLC’s assets, liabilities and earnings are allocated to all of the Series of the Trust based on their proportionate share of the cash pool. Each Series investment in the Frontier Trading Company XXXVIII, LLC is listed under Investments in unconsolidated trading companies, at fair value on the Statements of Financial Condition. 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, $393, $31,725, $346,855, $19,463, $154,671 and $63,205 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively, as of December 31, 2020. 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. 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 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 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 as of December 31, 2020. 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	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Fair Value Measurements	● 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 December 31, 2020 and December 31, 2019 segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value. 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 December 31, 2019 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies 24,150 - - 24,150 Swap Contracts - - 6,384,583 6,384,583 U.S. Treasury Securities 99,605 - - 99,605 Frontier Masters Fund Investment in Unconsolidated Trading Companies 11,005 - - 11,005 U.S. Treasury Securities 45,391 - - 45,391 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 14,711 - - 14,711 Swap Contracts - - 362,521 362,521 U.S. Treasury Securities 60,673 - - 60,673 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 50,867 - - 50,867 Open Trade Equity (Deficit) 57,057 59,127 - 116,184 Swap Contracts - - 11,944,753 11,944,753 U.S. Treasury Securities 209,799 - - 209,799 Frontier Select Fund Investment in Unconsolidated Trading Companies 26,331 - 479,024 505,355 U.S. Treasury Securities 108,603 - - 108,603 Frontier Global Fund (Formerly Winton Fund) Investment in Unconsolidated Trading Companies 11,818 - - 11,818 U.S. Treasury Securities 48,741 - - 48,741 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 18,891 - - 18,891 Swap Contracts - - 2,888,008 2,888,008 U.S. Treasury Securities 77,916 - - 77,916 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 the year ended December 31, 2020 and 2019, 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 $ - 2019 For the Year Ended December 31, 2019 Swaps Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2019 $ 10,794,908 $ 479,102 Total gains or losses (realized/unrealized): Included in earnings-realized - - Included in earnings-unrealized 1,149,845 (116,581 ) Proceeds from collateral reduction - - Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2019 $ 11,944,753 $ 362,521 Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2019 $ 5,920,414 $ 2,955,444 Total gains or losses (realized/unrealized): Included in earnings-realized - - Included in earnings-unrealized 464,169 (67,435 ) Proceeds from collateral reduction - - Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2019 $ 6,384,583 $ 2,888,009 For the Twelve Months Ended December 31, 2019 Investments in Unconsolidated Trading Companies: Frontier Balance of recurring Level 3 assets as of January 1, 2019 $ 511,718 Change in fair value of investments in unconsolidated trading companies (32,694 ) Proceeds from sales of investments of unconsolidated trading companies - 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, 2019 $ 479,024 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 years ended December 31, 2020 and 2019, the Trust did not transfer any assets between Levels 1, 2 or 3. The amounts reflected in the change in ownership allocation result from changes in ownership in the underlying Trading Companies at the Series level, which have resulted in changes in consolidation or de-consolidation by the Series. The ownership in the Trading Companies is accounted for under the equity method, which approximates fair value. The Frontier Heritage Fund and the Frontier Select Fund jointly owned the Frontier Brevan Howard swap. The Frontier Heritage Fund owned the majority interest in the Frontier Brevan Howard swap. The Frontier Select Fund (through its investment in an unconsolidated trading company) and Frontier Heritage Fund Brewan 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. Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Balanced Fund Frontier Heritage Fund Swap Contracts $ (1,537,399 ) $ 44,277 $ (3,088,917 ) $ 197,829 Frontier Select Fund Investments in Unconsolidated Trading Companies $ (91,989 ) The total change in unrealized appreciation (depreciation) included in the statements of operations attributable to level 3 investments still held at December 31, 2019. Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Balanced Fund Frontier Heritage Fund Swap Contracts $ 464,169 $ (116,581 ) $ 1,149,845 $ (67,436 ) Frontier Select Fund Investments in Unconsolidated Trading Companies $ (32,694 ) The total change in unrealized appreciation (depreciation) included in the statements of operations attributable to level 3 investments still held at December 31, 2018. Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Balanced Fund Frontier Heritage Fund Swap Contracts $ 643,941 $ 82,063 $ 1,453,948 $ (138,923 )
Frontier Funds [Member]
Fair Value Measurements	3. 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. 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 approved 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. The Swap Contracts are reported at fair value using Level 3 inputs. The Frontier Select Fund (through its investment in an unconsolidated trading company) and Frontier Heritage Fund Brewan 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. 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 December 31, 2020 and 2019, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value: 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 December 31, 2019 Level 1 Level 2 Level 3 Fair Open Trade Equity (Deficit) $ 57,056 $ 59,128 $ - $ 116,184 Swap Contracts - - 21,579,865 21,579,865 U.S. Treasury Securities 650,728 - - 650,728 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 ended 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 $ - For the Year ended Balance of recurring Level 3 assets as of January 1, 2019 $ 20,149,868 Total gains or losses (realized/unrealized): Included in earnings-realized - Included in earnings-unrealized 1,429,997 Proceeds from collateral reduction - Purchase of investments - Sale of investments - Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2019 $ 21,579,865 For the Year ended Balance of recurring Level 3 assets as of January 1, 2018 $ 21,208,838 Total gains or losses (realized/unrealized): Included in earnings-realized - Included in earnings-unrealized 2,041,028 Proceeds from collateral reduction (3,099,998 ) Purchase of investments - Sale of investments - Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2018 $ 20,149,868 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 years ended December 31, 2020 and 2019, 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). The total change in unrealized appreciation (depreciation) included in the statements of operations attributable to level 3 investments still held at December 31, 2019: Swaps $1,429,999.

Swap Contracts

Swap Contracts	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Swap Contracts	● 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 of December 31, 2020, and December 31, 2019, approximately 0.0% and 2.4% respectively, 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 Brewan 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 Balanced Fund Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Heritage Fund Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 $ (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 The Series have invested in the following swaps as of and for the year ended December 31, 2019: Frontier Balanced Fund Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Heritage Fund Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Notional Amount $ 7,420,403 $ 1,761,834 $ 653,610 $ 2,072,056 Termination Date 7/31/2023 7/31/2023 7/31/2023 3/27/2023 Cash Collateral $ 86,000 $ 86,000 $ 29,950 $ 975,450 Swap Value $ 11,858,754 $ 6,298,583 $ 332,571 $ 1,912,559 Investee Returns Total Returns Total Returns Total Returns Total Returns Realized Gain/(Loss) $ 0 $ 0 $ 0 $ 0 Change in Unrealized Gain/(Loss) $ 1,149,846 $ 464,169 $ (116,581 ) $ (67,435 ) Fair Value as of December 31, 2019 $ 11,944,754 $ 6,384,583 $ 362,521 $ 2,888,009 Advance on swap appreciation $ (6,176,555 ) $ (4,000,000 ) $ (115,000 ) $ (1,900,000 )
Frontier Funds [Member]
Swap Contracts	4. 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. As of December 31, 2019, approximately 2.4% or $1,177,400 respectively, of the Trust’s assets were deposited with over-the-counter counterparties in order to initiate and maintain swaps and is recorded as swap contracts, at fair value on the Statements of Financial Condition of the Trust. This cash held with the counterparty is not restricted. 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 Brewan Howard swap investments were liquidated on May 30, 2020 and Frontier Balanced Fund, Frontier Long/Short Commodity Fund, Frontier Diversified Fund TRS swap investment were liquidated on December 21, 2020. The Trust had invested in the following swaps as of and for the year ended December 31, 2020: XXXIV Balanced select swap XXXV Diversified select swap XXXVII L/S select swap Brevan Howard Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 ($ 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 The Trust had invested in the following swaps as of and for the year ended December 31, 2019: XXXIV Balanced select swap XXXV Diversified select swap XXXVII L/S Brevan Howard Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Deutsche Deutsche Deutsche Notional Amount $ 7,420,403 $ 1,761,834 $ 653,610 $ 2,072,056 Termination Date 7/31/2023 7/31/2023 7/31/2023 3/27/2023 Cash Collateral $ 86,000 $ 86,000 $ 29,950 $ 975,450 Swap Value $ 11,858,754 $ 6,298,583 $ 332,571 $ 1,912,559 Investee Returns Total Returns Total Returns Total Returns Total Returns Realized Gain/(Loss) $ 0 $ 0 $ 0 $ 0 Change in Unrealized Gain/(Loss) $ 1,149,846 $ 464,169 $ (116,581 ) $ (67,435 ) Fair Value as of December 31, 2019 $ 11,944,754 $ 6,384,583 $ 362,521 $ 2,888,009 Advance on swap appreciation $ (6,176,555 ) $ (4,000,000 ) $ (115,000 ) $ (1,900,000 )

Investments in Unconsolidated T

Investments in Unconsolidated Trading Companies and Private Investment Companies	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Investments in Unconsolidated Trading Companies and Private Investment Companies	● 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 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 following table summarizes each of the Series’ investments in unconsolidated Trading Companies as of December 31, 2020 and 2019: As of December 31, 2020 As of December 31, 2019 Percentage of Percentage of Series Total Series Total Capital Invested in Capital Invested in Series Unconsolidated Trading Companies Fair Value Unconsolidated Trading Companies Fair Value Frontier Diversified Series — Frontier Trading Company XXXVIII 0.40 % $ 16,669 0.20 % $ 24,150 Frontier Masters Fund — Frontier Trading Company XXXVIII 0.09 % $ 907 0.49 % $ 11,005 Frontier Long/Short Commodity Fund — Frontier Trading Company XXXVIII 1.35 % $ 17,736 1.10 % $ 14,711 Frontier Balanced Fund — Frontier Trading Company XXXVIII 0.41 % $ 49,755 0.23 % $ 50,867 Frontier Select Fund — Frontier Trading Companies XXXVIII and XXXIX* 0.00 % $ - 17.94 % $ 505,355 Frontier Global Fund — Frontier Trading Company XXXVIII 0.04 % $ 1,083 0.25 % $ 11,818 Frontier Heritage Fund — Frontier Trading Company XXXVIII 0.12 % $ 2,880 0.57 % $ 18,891 * The investment in Frontier Trading Company XXXIX was sold as of June 30, 2020. The Galaxy Plus entities are made up a feeder funds in which the Series invest and master trading entities into which the feeder funds invest. No investment held by the Galaxy Plus master trading entity is greater than 5% of the Series’ total capital. The Series investments in private investment companies have certain redemption and liquidity restrictions which are described in the following table: Redemptions Redemptions Liquidity Notice Period Permitted Restrictions Frontier 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 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 March 12, 2020, Emil Van Essen and Transtrend BV ceased to act as a commodity trading advisors to the Trust. Effective April 1, 2020, Landmark Trading Company ceased to act as a commodity trading advisor to the Trust. Effective May 30, 2020, BH-DG Systematic Trading LLP ceased to act as a commodity trading advisor to the Trust. Effective July 20, 2020, Doherty Advisors, LLC accessed through Galaxy Plus Fund – Doherty Feeder Fund (528) LLC ceased to act as a commodity trading advisor to the Trust. Effective August 1, 2020, John Locke Investments SA accessed through Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC became a new commodity trading advisor for Frontier Diversified Fund, Frontier Balanced Fund, Frontier Select Fund and Frontier Masters Fund. Effective December 21, 2020, JE Moody & Company H2O AM LLP and Crabel Capital Management, LLC ceased to act as a commodity trading advisor to the Trust.
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 a 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 Trust’s investments in private investment companies have certain redemption and liquidity restrictions which are described in the following table: Redemptions Redemptions Liquidity Notice Period Permitted Restrictions Frontier Funds Multi-Strategy Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None 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 March 12, 2020, Emil Van Essen and Transtrend BV ceased to act as a commodity trading advisor to the Trust. Effective April 1, 2020, Landmark Trading Company ceased to act as a commodity trading advisor to the Trust. Effective May 30, 2020, BH-DG Systematic Trading LLP ceased to act as a commodity trading advisor to the Trust. Effective July 20, 2020, Doherty Advisors, LLC accessed through Galaxy Plus Fund – Doherty Feeder Fund (528) LLC ceased to act as a commodity trading advisor to the Trust. Effective August 1, 2020, John Locke Investments SA accessed through Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC became a new commodity trading advisor for Frontier Diversified Fund, Frontier Balanced Fund, Frontier Select Fund and Frontier Masters Fund. Effective December 21, 2020, JE Moody & Company, H2O AM LLP and Crabel Capital Management, LLC ceased to act as a commodity trading advisor to the Trust.

Transactions with Affiliates

Transactions with Affiliates	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Transactions with Affiliates	● Transactions with Affiliates The Managing Owner contributes funds to the Trust, with respect to the Series, in order to have a 1% interest (“Minimum Purchase Commitment”) in the aggregate capital, profits and losses of all Series and in return will receive units designated as general units in the Series in which the Managing Owner invests such funds. The general units may only be purchased by the Managing Owner and may be subject to no management fees or management fees at reduced rates. Otherwise, the general units hold the same rights as the limited units. The Managing Owner will make contributions to the Series of the Trust necessary to maintain at least a 1% interest in the aggregate capital, profits and losses of the combined Series of the Trust. Such contribution was made by the Managing Owner before trading commenced for the Trust and will be maintained throughout the existence of the Trust, and the Managing Owner will make such purchases as are necessary to effect this requirement. Additionally, the Managing Owner agreed with certain regulatory bodies to maintain a 1% interest specifically in the Frontier Balanced Fund Class 1AP and 2a Units, aggregated, and each of the Frontier Long/Short Commodity Fund, Frontier Diversified Fund and Frontier Masters Fund. The 1% interest in these specific Series is included in computing the Minimum Purchase Commitment in aggregate capital. In addition to the general units the Managing Owner receives in respect of its Minimum Purchase Commitment, the Managing Owner may purchase limited units in any Series as a Limited Owner. Principals of the Managing Owner or affiliates are allowed to own beneficial interests in the Trust, with respect to the Series, as well. All Units purchased by the Managing Owner are held for investment purposes only and not for resale. The Managing Owner may make purchases or redemptions at any time on the same terms as any Limited Owner. The Trust has and will continue to have certain relationships with the Managing Owner and its affiliates. Expenses Management Fees— As of the date of this report, for a Series that has invested in a swap, a Trading Advisor does not receive any management fees directly from the Series for such swap, and instead the relevant Trading Advisor receives compensation via the fees embedded in the swap. As of December 31, 2020 and 2019, 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, $393, $31,725, $346,855, $19,463, $154,671 and $63,205 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively, as of December 31, 2020. The following table summarizes fees earned by the Managing Owner and the Former Managing Owner for the years ended December 31, 2020, 2019 and 2018. For the Year Ended December 31, 2020 Incentive Management Service Trading Frontier Diversified Fund - - 14,246 251,203 Frontier Masters Fund - - 1,786 101,300 Frontier Long/Short Commodity Fund - - 381 32,628 Frontier Balanced Fund - 19,600 351,503 580,978 Frontier Select Fund - - 62,144 53,759 Frontier Global Fund - - 100,858 186,591 Frontier Heritage Fund - - 66,761 104,941 For the Year Ended December 31, 2019 Incentive Management Service Trading Frontier Diversified Fund - $ 2,668 $ 44,726 $ 493,585 Frontier Masters Fund - 7,665 11,635 213,153 Frontier Long/Short Commodity Fund - - 562 54,334 Frontier Balanced Fund - 22,377 606,359 972,678 Frontier Select Fund - - 102,692 85,589 Frontier Global Fund - 38,679 177,833 278,497 Frontier Heritage Fund - 7,289 84,518 118,979 For the Year Ended December 31, 2018 Incentive Management Service Trading Frontier Diversified Fund (4,499 ) $ 44,289 $ 58,473 $ 591,665 Frontier Masters Fund - 108,413 49,049 420,391 Frontier Long/Short Commodity Fund (3,789 ) - 1,653 82,890 Frontier Balanced Fund 145,134 77,495 920,570 1,378,226 Frontier Select Fund - - 132,408 117,056 Frontier Global Fund - 487,698 318,897 307,053 Frontier Heritage Fund 697 120,602 123,257 142,735 The following table summarizes fees payable to the Managing Owner and Former Managing Owner as of December 31, 2020 and 2019. 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 As of December 31, 2019 Incentive Management Interest Service Trading Frontier Diversified Fund $ - $ - $ - $ 3,391 $ 35,877 Frontier Masters Fund - - - 204 11,673 Frontier Long/Short Commodity Fund - - - - 3,468 Frontier Balanced Fund - 8,795 105 41,635 70,179 Frontier Select Fund - - - 6,906 6,000 Frontier Global Fund - - 56 11,263 22,540 Frontier Heritage Fund - - 166 5,362 11,170 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 Former Managing Owner and its ratio to average net assets for the years ended December 31, 2020, 2019 and 2018: 2020 2019 2018 2020 2019 2018 Gross Amount Gross Amount Gross Amount Ratio to Average Ratio to Average Ratio to Average Frontier Diversified Fund Class 1 128,397 $ - $ - 33.62 % 0.00 % 0.00 % Frontier Diversified Fund Class 2 791,849 - - 29.93 % 0.00 % 0.00 % Frontier Diversified Fund Class 3 617,154 - - 14.78 % 0.00 % 0.00 % Frontier Masters Fund Class 1 219 - - 2.00 % 0.00 % 0.00 % Frontier Masters Fund Class 2 1,567 - - 0.25 % 0.00 % 0.00 % Frontier Masters Fund Class 3 - - - 0.00 % 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2 27 14 141 0.07 % 0.02 % 0.00 % Frontier Long/Short Commodity Fund Class 3 703 337 1,902 0.07 % 0.02 % 0.39 % Frontier Balanced Fund Class 1 7,387 3,925 47,797 0.06 % 0.02 % 0.16 % Frontier Balanced Fund Class 1AP 103 64 (1,082 ) 0.06 % 0.02 % -0.21 % Frontier Balanced Fund Class 2 1,484 764 8,556 0.06 % 0.02 % 0.16 % Frontier Balanced Fund Class 2a 17 10 (237 ) 0.01 % 0.00 % -0.06 % Frontier Balanced Fund Class 3a 80 32 (520 ) 0.01 % 0.00 % -0.05 % Frontier Select Fund Class 1 4,514 5,563 8,986 0.22 % 0.16 % 0.10 % Frontier Select Fund Class 1AP 24 15 39 0.24 % 0.19 % 0.13 % Frontier Select Fund Class 2 173 174 919 0.23 % 0.16 % 0.11 % Frontier Global Fund Class 1 3,110 23,787 122,387 0.09 % 0.40 % 3.30 % Frontier Global Fund Class 1AP 28 114 623 0.10 % 0.33 % 0.01 % Frontier Global Fund Class 2 238 1,386 10,552 0.09 % 0.35 % 0.17 % Frontier Heritage Fund Class 1 5,141 5,323 18,510 0.23 % 0.19 % 0.70 % Frontier Heritage Fund Class 1AP 20 9 13 0.24 % 0.15 % 0.00 % Frontier Heritage Fund Class 2 847 1,088 2,948 0.20 % 0.18 % 0.10 % Total $ 1,563,082 $ 42,605 $ 221,534
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 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. As of December 31, 2019, the Trust had a payable to the Managing Owner in the amounts of $0, $8,795, $327, $160,907 and $68,762 for incentive fees, management fees, interest, trading fees, and service fees, respectively. As of December 31, 2018, the Trust had a payable to the Managing Owner in the amounts of $ For the year ended December 31, 2020, the Managing Owner earned $0, $19,600, $597,679 and $1,311,400 for incentive fees, management fees, service fees, and trading fees, respectively. For the year ended December 31, 2019, the Managing Owner earned $0, $78,678, $1,028,325 and $2,216,815for incentive fees, management fees, service fees, and trading fees, respectively. For the year ended December 31, 2018, the Managing Owner earned $137,543, $838,497, $1,604,307 and $3,040,016 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 (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.

Financial Highlights

Financial Highlights	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Financial Highlights	● Financial Highlights The following information presents the financial highlights of the Series for the years ended December 31, 2020, 2019 and 2018. This data has been derived from the information presented in the financial statements. For the year ended December 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 0.01 0.01 0.01 0.09 0.12 0.11 0.14 0.25 0.16 0.27 0.17 Expenses (6.39 ) (3.65 ) (3.23 ) (14.02 ) (4.83 ) (4.51 ) (3.09 ) (2.09 ) (1.34 ) (2.19 ) (1.41 ) Net gain/(loss) on investments, net of non-controlling interests (22.03 ) (28.98 ) (27.06 ) (3.17 ) (14.93 ) (13.86 ) (41.24 )* 6.22 3.91 6.49 4.30 Net income/(loss) (28.42 ) (32.63 ) (30.28 ) (17.10 ) (19.64 ) (18.27 ) (44.20 )* 4.39 2.74 4.56 3.05 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 Ratios to average net assets Net investment income/(loss) -7.33 % -3.60 % -3.60 % -22.42 % -6.13 % -6.13 % -6.61 % -2.21 % -2.21 % -2.21 % -2.21 % Expenses before incentive fees (3)(4) 7.34 % 3.61 % 3.61 % 22.57 % 6.28 % 6.28 % 6.91 % 2.51 % 2.51 % 2.51 % 2.51 % Expenses after incentive fees (3)(4) 7.34 % 3.61 % 3.61 % 22.57 % 6.28 % 6.28 % 6.91 % 2.51 % 2.51 % 2.51 % 2.51 % Total return before incentive fees (2) -28.11 % -26.84 % -26.65 % -23.66 % -22.53 % -22.33 % -1.63 %* 5.38 % 5.20 % 5.33 % 5.52 % Total return after incentive fees (2) -28.11 % -26.84 % -26.65 % -23.66 % -22.53 % -22.33 % -1.63 %* 5.38 % 5.20 % 5.33 % 5.52 % 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 0.04 0.04 0.06 0.05 0.05 0.00 0.00 0.00 Expenses (6.16 ) (4.17 ) (5.64 ) (4.92 ) (4.87 ) (3.40 ) (1.82 ) (2.42 ) Net gain/(loss) on investments, net of non-controlling interests (31.19 ) (36.87 ) (49.70 ) (42.97 ) (42.87 ) (4.60 ) (5.70 ) (7.32 ) Net income/(loss) (37.31 ) (41.00 ) (55.28 ) (47.84 ) (47.69 ) (8.01 ) (7.52 ) (9.74 ) Net asset value, December 31, 2020 $ 79.93 $ 96.81 $ 130.54 $ 113.20 $ 112.81 $ 58.55 $ 70.99 $ 94.20 Ratios to average net assets Net investment income/(loss) -6.98 % -3.99 % -3.99 % -3.99 % -3.99 % -5.49 % -2.49 % -2.49 % Expenses before incentive fees (3)(4) 7.03 % 4.03 % 4.03 % 4.03 % 4.03 % 5.49 % 2.49 % 2.49 % Expenses after incentive fees (3)(4) 7.03 % 4.03 % 4.03 % 4.03 % 4.03 % 5.49 % 2.49 % 2.49 % Total return before incentive fees (2) -31.82 % -29.75 % -29.75 % -29.71 % -29.71 % -12.03 % -9.58 % -9.37 % Total return after incentive fees (2) -31.82 % -29.75 % -29.75 % -29.71 % -29.71 % -12.03 % -9.58 % -9.37 % 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 (9.95 ) (7.59 ) (9.47 ) (6.76 ) (4.58 ) (6.26 ) Net gain/(loss) on investments, net of non-controlling interests (10.67 ) (146.84 )* (15.79 ) 5.33 6.93 8.58 Net income/(loss) (20.62 ) (154.43 )* (25.26 ) (1.44 ) 2.35 2.32 Net asset value, December 31, 2020 $ 110.90 $ - * $ 167.56 $ 96.10 $ 116.50 $ 155.92 Ratios to average net assets Net investment income/(loss) -8.11 % -5.12 % -5.12 % -6.93 % -3.93 % -3.93 % Expenses before incentive fees (3)(4) 8.11 % 5.12 % 5.12 % 6.93 % 3.93 % 3.93 % Expenses after incentive fees (3)(4) 8.11 % 5.12 % 5.12 % 6.93 % 3.93 % 3.93 % Total return before incentive fees (2) -15.68 % -23.34 %* -13.10 % -1.47 % 2.06 % 1.51 % Total return after incentive fees (2) -15.68 % -23.34 %* -13.10 % -1.47 % 2.06 % 1.51 % (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 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. For the year ended December 31, 2019 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, 2018 $ 102.25 $ 120.84 $ 112.62 $ 91.10 $ 107.68 $ 100.77 $ 56.80 $ 98.82 $ 66.52 $ 103.66 $ 69.83 Net operating results: Interest income 0.15 0.17 0.16 0.11 0.13 0.12 0.05 0.10 0.06 0.10 0.06 Expenses (6.83 ) (4.47 ) (4.17 ) (7.39 ) (6.11 ) (5.75 ) (3.24 ) (2.57 ) (1.62 ) (2.70 ) (1.70 ) Net gain/(loss) on investments, net of non-controlling interests 5.54 5.03 4.99 (11.54 ) (14.52 ) (13.36 ) (9.41 ) (14.74 ) (12.41 ) (15.41 ) (12.88 ) Net income/(loss) (1.15 ) 0.74 0.98 (18.82 ) (20.49 ) (18.98 ) (12.60 ) (17.22 ) (13.97 ) (18.02 ) (14.51 ) 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 Ratios to average net assets Net investment income/(loss) -6.58 % -3.55 % -3.55 % -8.52 % -5.91 % -5.91 % -6.45 % -2.67 % -2.67 % -2.67 % -2.67 % Expenses before incentive fees (3)(4) 6.73 % 3.70 % 3.70 % 8.65 % 6.04 % 6.04 % 6.55 % 2.77 % 2.77 % 2.77 % 2.77 % Expenses after incentive fees (3)(4) 6.73 % 3.70 % 3.70 % 8.65 % 6.04 % 6.04 % 6.55 % 2.77 % 2.77 % 2.77 % 2.77 % Total return before incentive fees (2) -1.12 % 0.61 % 0.87 % -20.66 % -19.03 % -18.84 % -22.19 % -17.43 % -21.00 % -17.38 % -20.79 % Total return after incentive fees (2) -1.12 % 0.61 % 0.87 % -20.66 % -19.03 % -18.84 % -22.19 % -17.43 % -21.00 % -17.38 % -20.79 % 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, 2018 $ 117.63 $ 134.16 $ 180.94 $ 156.81 $ 156.26 $ 71.41 $ 82.48 $ 108.18 Net operating results: Interest income 0.21 0.24 0.33 0.28 0.28 (0.00 ) 0.00 (0.00 ) Expenses (8.01 ) (5.25 ) (7.08 ) (6.12 ) (6.12 ) (3.93 ) (2.09 ) (2.69 ) Net gain/(loss) on investments, net of non-controlling interests 7.40 8.66 11.63 10.08 10.08 (0.93 ) (1.88 ) (1.55 ) Net income/(loss) (0.40 ) 3.65 4.88 4.23 4.24 (4.86 ) (3.97 ) (4.24 ) Net asset value, December 31, 2019 $ 117.23 $ 137.81 $ 185.82 $ 161.04 $ 160.50 $ 66.56 $ 78.51 $ 103.94 Ratios to average net assets Net investment income/(loss) -6.73 % -3.73 % -3.73 % -3.73 % -3.73 % -5.42 % -2.42 % -2.42 % Expenses before incentive fees (3)(4) 6.91 % 3.91 % 3.91 % 3.91 % 3.91 % 5.42 % 2.42 % 2.42 % Expenses after incentive fees (3)(4) 6.91 % 3.91 % 3.91 % 3.91 % 3.91 % 5.42 % 2.42 % 2.42 % Total return before incentive fees (2) -0.34 % 2.72 % 2.70 % 2.70 % 2.71 % -6.80 % -4.81 % -3.92 % Total return after incentive fees (2) -0.34 % 2.72 % 2.70 % 2.70 % 2.71 % -6.80 % -4.81 % -3.92 % Frontier Global Fund (Formerly 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, 2018 $ 131.57 $ 149.92 $ 187.17 $ 99.83 $ 111.78 $ 152.53 Net operating results: Interest income (0.00 ) (0.00 ) (0.00 ) (0.00 ) 0.00 (0.00 ) Expenses (11.16 ) (8.15 ) (10.11 ) (6.90 ) (4.62 ) (5.93 ) Net gain/(loss) on investments, net of non-controlling interests 11.11 12.66 15.76 4.61 7.00 7.00 Net income/(loss) (0.05 ) 4.51 5.65 (2.29 ) 2.37 1.06 Net asset value, December 31, 2019 $ 131.52 $ 154.43 $ 192.82 $ 97.54 $ 114.15 $ 153.59 Ratios to average net assets Net investment income/(loss) -7.99 % -4.99 % -4.99 % -6.71 % -3.70 % -3.70 % Expenses before incentive fees (3)(4) 7.99 % 4.99 % 4.99 % 6.71 % 3.70 % 3.70 % Expenses after incentive fees (3)(4) 7.99 % 4.99 % 4.99 % 6.71 % 3.70 % 3.70 % Total return before incentive fees (2) -0.04 % 3.01 % 3.02 % -2.30 % 2.12 % 0.70 % Total return after incentive fees (2) -0.04 % 3.01 % 3.02 % -2.30 % 2.12 % 0.70 % (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 year ended December 31, 2018 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, 2017 $ 116.41 $ 135.19 $ 125.68 $ 114.74 $ 133.27 $ 124.40 $ 81.35 $ 115.81 $ 93.59 $ 121.50 $ 97.99 Net operating results: Interest income 0.21 0.24 0.23 0.30 0.35 0.33 0.28 0.41 0.31 0.42 0.33 Expenses (7.04 ) (4.43 ) (4.13 ) (9.05 ) (8.14 ) (7.55 ) (4.71 ) (2.61 ) (2.01 ) (2.71 ) (2.12 ) Net gain/(loss) on investments, net of non-controlling interests (7.33 ) (10.16 ) (9.16 ) (14.88 ) (17.80 ) (16.41 ) (20.12 ) (14.79 ) (25.38 ) (15.56 ) (26.37 ) Net income/(loss) (14.16 ) (14.35 ) (13.06 ) (23.64 ) (25.59 ) (23.63 ) (24.55 ) (16.99 ) (27.07 ) (17.84 ) (28.16 ) Net asset value, December 31, 2018 $ 102.25 $ 120.84 $ 112.62 $ 91.10 $ 107.68 $ 100.77 $ 56.80 $ 98.82 $ 66.52 $ 103.66 $ 69.83 Ratios to average net assets Net investment income/(loss) -8.66 % -4.56 % -4.56 % -12.07 % -9.10 % -9.10 % -7.95 % -2.73 % -2.73 % -2.73 % -2.74 % Expenses before incentive fees (3)(4) 8.95 % 4.85 % 4.85 % 12.47 % 9.51 % 9.51 % 8.56 % 3.34 % 3.34 % 3.34 % 3.38 % Expenses after incentive fees (3)(4) 8.92 % 4.82 % 4.82 % 12.47 % 9.51 % 9.51 % 8.45 % 3.23 % 3.23 % 3.23 % 3.24 % Total return before incentive fees (2) -12.19 % -10.64 % -10.42 % -20.60 % -19.20 % -19.00 % -30.29 % -14.78 % -29.04 % -14.80 % -28.88 % Total return after incentive fees (2) -12.16 % -10.61 % -10.39 % -20.60 % -19.20 % -19.00 % 30.18 % -14.67 % -28.92 % -14.68 % -28.74 % 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, 2017 $ 135.96 $ 150.56 $ 202.90 $ 175.77 $ 175.18 $ 90.27 $ 100.02 $ 132.73 Net operating results: Interest income 0.12 0.14 0.19 0.16 0.16 0.00 0.00 0.00 Expenses (8.93 ) (5.90 ) (7.95 ) (6.89 ) (6.87 ) (4.19 ) (2.15 ) (2.94 ) Net gain/(loss) on investments, net of non-controlling interests (9.52 ) (10.64 ) (14.20 ) (12.23 ) (12.21 ) (14.67 ) (15.39 ) (21.61 ) Net income/(loss) (18.33 ) (16.40 ) (21.96 ) (18.96 ) (18.92 ) (18.86 ) (17.54 ) (24.55 ) Net asset value, December 31, 2018 $ 117.63 $ 134.16 $ 180.94 $ 156.81 $ 156.26 $ 71.41 $ 82.48 $ 108.18 Ratios to average net assets Net investment income/(loss) -9.49 % -5.48 % -5.48 % -5.48 % -5.48 % -7.38 % -3.37 % -3.37 % Expenses before incentive fees (3)(4) 9.24 % 5.23 % 5.23 % 5.23 % 5.23 % 7.38 % 3.37 % 3.37 % Expenses after incentive fees (3)(4) 9.62 % 5.62 % 5.62 % 5.62 % 5.62 % 7.38 % 3.37 % 3.37 % Total return before incentive fees (2) -13.10 % -10.51 % -10.44 % -10.41 % -10.42 % -20.89 % -17.54 % -18.50 % Total return after incentive fees (2) -13.48 % -10.89 % -10.82 % -10.79 % -10.80 % -20.89 % -17.54 % -18.50 % Frontier Winton 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, 2017 $ 159.08 $ 176.44 $ 216.50 $ 121.19 $ 134.28 $ 179.70 Net operating results: Interest income (0.00 ) (0.00 ) 0.01 (0.00 ) 0.00 (0.00 ) Expenses (14.29 ) (11.05 ) (14.12 ) (10.86 ) (8.95 ) (11.58 ) Net gain/(loss) on investments, net of non-controlling interests (13.22 ) (15.47 ) (15.21 ) (10.50 ) (13.55 ) (15.59 ) Net income/(loss) (27.51 ) (26.52 ) (29.33 ) (21.36 ) (22.50 ) (27.17 ) Net asset value, December 31, 2018 $ 131.57 $ 149.92 $ 187.17 $ 99.83 $ 111.78 $ 152.53 Ratios to average net assets Net investment income/(loss) -13.50 % -9.49 % -9.49 % -11.85 % -7.84 % -7.84 % Expenses before incentive fees (3)(4) 13.50 % 9.49 % 9.49 % 11.84 % 7.83 % 7.83 % Expenses after incentive fees (3)(4) 13.50 % 9.49 % 9.49 % 11.85 % 7.84 % 7.84 % Total return before incentive fees (2) -17.29 % -15.03 % -13.55 % -17.61 % -16.74 % -15.11 % Total return after incentive fees (2) -17.29 % -15.03 % -13.55 % -17.63 % -16.76 % -15.12 % (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 years ended December 31, 2020, 2019 and 2018. This data has been derived from the information presented in the consolidated financial statements. 2020 2019 2018 2017 Ratios to average net assets (1) Net investment income/(loss) (1) -5.71 % -5.54 % -6.27 % -5.50 % Expenses before incentive fees (3) (4) -5.75 % -5.71 % -6.37 % 4.48 % Expenses after incentive fees (3) (4) -5.75 % -5.71 % -6.52 % 5.75 % Total return before incentive fees (2) -32.58 % -1.89 % -16.86 % 3.62 % Total return after incentive fees (2) -32.58 % -1.89 % -17.01 % 2.35 % (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. 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 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	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Derivative Instruments and Hedging Activities	● Derivative Instruments and Hedging Activities The Series’ primary business is to engage in speculative trading of a diversified portfolio of futures, forwards (including interbank foreign currencies), options contracts and other derivative instruments (including swap contracts). The Series do not enter into or hold positions for hedging purposes as defined under ASC 815, Derivatives and Hedging (“ASC 815”). The detail of the fair value of the Series’ derivatives by instrument types as of December 31, 2020 and 2019 is included in the Condensed Schedules of Investments. See Note 4 for further disclosure related to each Series’ position 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. The following tables summarize the monthly averages of futures contracts bought and sold for each respective Series of the Trust: For the Year Ended December 31, 2020 Monthly average contracts: Bought Sold Frontier Balanced Fund 613 612 For the Year Ended December 31, 2019 Monthly average contracts: Bought Sold Frontier Balanced Fund 1,209 1,409 For the Year Ended December 31, 2018 Monthly average contracts: Bought Sold Frontier Balanced Fund 2,183 1,971 The following tables summarize the trading revenues for the years ended December 31, 2020, 2019 and 2018 by sector: Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2020 Type of contract Frontier Balanced Agriculturals $ 147,013 Currencies 90,903 Energies 118,920 Interest rates 59,037 Metals 217,301 Stock indices (34,911 ) Realized trading income/(loss) (1) $ 598,263 Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Frontier Balanced Agriculturals $ 230,294 Currencies (104,140 ) Energies 124,324 Interest rates (43,735 ) Metals (71,367 ) Stock indices 151 Realized trading income/(loss) (1) $ 135,527 Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Frontier Balanced Agriculturals $ (20,839 ) Currencies (374,202 ) Energies 74,850 Interest rates (62,765 ) Metals 11,010 Stock indices (4,991 ) Realized trading income/(loss) (1) $ (376,937 ) (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 Year Ended December 31, 2020 Type of contract Frontier Balanced Agriculturals $ 27,115 Currencies 14,158 Energies (25,335 ) Interest rates 4,660 Metals (1,619 ) Stock indices 11,486 Change in unrealized trading income/(loss) (1) $ 30,465 Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Frontier Balanced Agriculturals $ (37,494 ) Currencies (127,586 ) Energies 9,624 Interest rates (4,922 ) Metals 26,498 Stock indices - Change in unrealized trading income/(loss) (1) $ (133,880 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Frontier Balanced Agriculturals $ (16,846 ) Currencies (124,436 ) Energies (73,724 ) Interest rates 207,810 Metals 14,424 Stock indices 7,107 Change in unrealized trading income/(loss) (1) $ 14,335 (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 futures commissions merchants (each, an “FCM”) 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 December 31, 2020 and 2019. As of December 31, 2020 Gross Amounts of Gross Amounts Net Amounts Frontier Balanced Fund Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440 As of December 31, 2019 Gross Amounts of Gross Amounts offset Net Amounts Presented Frontier Balanced Fund Open Trade Equity/(Deficit) $ 154,778 $ (38,594 ) $ 116,184 Swap Contracts 11,944,753 - $ 11,944,753 Frontier Diversified Fund Swap Contracts $ 6,384,583 $ - $ 6,384,583 Frontier Long/Short Commodity Fund Swap Contracts $ 362,521 $ - $ 362,521 Frontier Heritage Fund Swap Contracts $ 2,888,009 $ - $ 2,888,009
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 December 31, 2020 and 2019 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 years ended December 31, 2020, 2019 and 2018, the monthly average of futures, forwards and options contracts bought was approximately 613, 1,321, and 2,684 respectively and the monthly average of futures, forwards, and options contracts sold was approximately 612, 1,515, and 2,482, respectively. The following tables summarize the trading revenues for the years ended December 31, 2020, 2019 and 2018 by contract type: Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2020 Type of contract Agriculturals $ 147,013 Currencies 90,903 Energies 118,920 Interest rates 59,037 Metals 217,301 Stock indices (34,911 ) Realized trading income/(loss) (1) $ 598,263 Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Agriculturals $ 215,822 Currencies (553,764 ) Energies (430,890 ) Interest rates 273,302 Metals (691,581 ) Stock indices (34,113 ) Realized trading income/(loss) (1) $ (1,221,224 ) Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Agriculturals $ 147,573 Currencies (1,078,570 ) Energies 1,399,946 Interest rates 54,450 Metals 752,938 Stock indices (594,823 ) Realized trading income/(loss) (1) Realized trading income/(loss) (1) $ 681,514 (1) Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2020 Type of contract Agriculturals $ 27,115 Currencies 14,158 Energies (25,335 ) Interest rates 4,660 Metals (1,619 ) Stock indices 11,486 Change in unrealized trading income/(loss) (1) $ 30,465 Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Agriculturals $ (92,782 ) Currencies 100,545 Energies 221,904 Interest rates (231,584 ) Metals 516,390 Stock indices 54,311 Change in unrealized trading income/(loss) (1) $ 568,784 Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Metals $ (83,504 ) Currencies (682,646 ) Energies (642,839 ) Interest rates 494,997 Agriculturals (1,035,591 ) Stock indices (195,081 ) Change in unrealized trading income/(loss) (1) $ (2,144,664 ) (1) 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 futures commission merchants (each, an “FCM”) 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 December 31, 2020 and 2019: As of December 31, 2020 Gross Amounts of recognized Derivative Assets/Liabilities Gross Amounts offset in the Statements of Financial Condition Net Amounts Presented in the Statements of Financial Condition Frontier Balanced Fund Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440 As of December 31, 2019 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) $ 154,778 $ (38,594 ) $ 116,184 Swap Contracts $ 21,579,866 - $ 21,579,866

Trading Activities and Related

Trading Activities and Related Risks	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Trading Activities and Related Risks	● 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, clearing house 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	8. 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	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Indemnifications and Guarantees noted in Management Discussion and Analysis	● 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	9. 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	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Subsequent Events	● 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 January 1, 2021 through March 10, 2021, Frontier Balanced Fund, Frontier Diversified Fund, Frontier Heritage Fund, Frontier Long/Short Commodity Fund, Frontier Masters Fund, and Frontier Select Fund paid $1,011,147, $216,823, $97,272, $41,767, $43,942 and $110,485, respectively, in redemptions.
Frontier Funds [Member]
Subsequent Events	10. 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 January 01, 2021 through March 10, 2021, the Trust paid $1,521,437 in redemptions.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
The Series of 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. As of December 31, 2020, and 2019, the consolidated statements of financial condition of Frontier Balanced Fund included the assets and liabilities of its wholly owned interests in Frontier Trading Company I, LLC and Frontier Trading Company XXXIV, LLC. For the year ended December 31, 2020, 2019 and 2018 the consolidated statements of operations of Frontier Balanced Fund included the earnings of its wholly owned interest in Frontier Trading Company I, LLC and Frontier Trading Company XXXIV, LLC. As of December 31, 2020, and 2019, the consolidated statements of financial condition of Frontier Long/Short Commodity Fund included the assets and liabilities of its wholly owned Trading Company, Frontier Trading Company XXXVII, LLC. For the years ended December 31, 2020, 2019 and 2018, the consolidated statements of operations of Frontier Long/Short Commodity Fund included the earnings of its wholly owned Trading Company listed above. As of December 31, 2020, and 2019, the consolidated statements of financial condition of Frontier Diversified Fund included the assets and liabilities of its wholly owned Frontier Trading Company XXXV, LLC. For the years ended December 31, 2020, 2019, and 2018 the consolidated statements of operations of Frontier Diversified Fund included the earnings of its wholly owned Trading Company listed above. As of and for the years ended December 31, 2020, 2019, and 2018, the consolidated statements of financial condition and statement of operations of Frontier Heritage Fund included the assets and liabilities, and earnings, respectively, of its majority owned Trading Company, Frontier Trading Company XXXIX, LLC. For the year ended December 31, 2020, 2019 and 2018, the consolidated statements of operations of Frontier Select Fund included the earnings of its majority owned Trading Company. For the year ended December 31, 2019 and 2018, the consolidated statements of operations of Frontier Global Fund include the earnings of its majority owned Trading Company, Frontier Trading Company II, LLC from January 1, 2017 through December 14, 2017. As of and for the years ended December 31, 2019, 2018 and 2017, Frontier Master Fund did not have a majority interest in any Trading Company. Each of the Series has invested in Frontier Trading Company XXXVIII, LLC on the same basis as its ownership in the cash pool. Frontier Trading Company XXXVIII, LLC’s assets, liabilities and earnings are allocated to all of the Series of the Trust based on their proportionate share of the cash pool. Each Series investment in the Frontier Trading Company XXXVIII, LLC is listed under Investments in unconsolidated trading companies, at fair value on the Statements of Financial Condition.
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 $22,650, $393, $31,725, $346,855, $19,463, $154,671 and $63,205 for the Frontier Diversified, Long/Short Commodity, Masters, Balanced, Select, Global and Heritage Funds, respectively, as of December 31, 2020. 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.
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 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 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 as of December 31, 2020. 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)	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Schedule of financial asset portfolio measured at fair value	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 December 31, 2019 Level 1 Level 2 Level 3 Total Frontier Diversified Fund Investment in Unconsolidated Trading Companies 24,150 - - 24,150 Swap Contracts - - 6,384,583 6,384,583 U.S. Treasury Securities 99,605 - - 99,605 Frontier Masters Fund Investment in Unconsolidated Trading Companies 11,005 - - 11,005 U.S. Treasury Securities 45,391 - - 45,391 Frontier Long/Short Commodity Fund Investment in Unconsolidated Trading Companies 14,711 - - 14,711 Swap Contracts - - 362,521 362,521 U.S. Treasury Securities 60,673 - - 60,673 Frontier Balanced Fund Investment in Unconsolidated Trading Companies 50,867 - - 50,867 Open Trade Equity (Deficit) 57,057 59,127 - 116,184 Swap Contracts - - 11,944,753 11,944,753 U.S. Treasury Securities 209,799 - - 209,799 Frontier Select Fund Investment in Unconsolidated Trading Companies 26,331 - 479,024 505,355 U.S. Treasury Securities 108,603 - - 108,603 Frontier Global Fund (Formerly Winton Fund) Investment in Unconsolidated Trading Companies 11,818 - - 11,818 U.S. Treasury Securities 48,741 - - 48,741 Frontier Heritage Fund Investment in Unconsolidated Trading Companies 18,891 - - 18,891 Swap Contracts - - 2,888,008 2,888,008 U.S. Treasury Securities 77,916 - - 77,916
Schedule of change in Level 3 assets measured at fair value on recurring basis	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 $ - 2019 For the Year Ended December 31, 2019 Swaps Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2019 $ 10,794,908 $ 479,102 Total gains or losses (realized/unrealized): Included in earnings-realized - - Included in earnings-unrealized 1,149,845 (116,581 ) Proceeds from collateral reduction - - Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2019 $ 11,944,753 $ 362,521 Frontier Frontier Balance of recurring Level 3 assets as of January 1, 2019 $ 5,920,414 $ 2,955,444 Total gains or losses (realized/unrealized): Included in earnings-realized - - Included in earnings-unrealized 464,169 (67,435 ) Proceeds from collateral reduction - - Change in ownership allocation - - Transfers in and/or out of Level 3 - - Balance of recurring Level 3 assets as of December 31, 2019 $ 6,384,583 $ 2,888,009 For the Twelve Months Ended December 31, 2019 Investments in Unconsolidated Trading Companies: Frontier Balance of recurring Level 3 assets as of January 1, 2019 $ 511,718 Change in fair value of investments in unconsolidated trading companies (32,694 ) Proceeds from sales of investments of unconsolidated trading companies - 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, 2019 $ 479,024
Schedule of change in unrealized appreciation (depreciation)	Frontier Balanced Fund, Frontier Long/Short Commodity Fund, Frontier Diversified Fund TRS swap investments were liquidated on December 21, 2020. Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Balanced Fund Frontier Heritage Fund Swap Contracts $ (1,537,399 ) $ 44,277 $ (3,088,917 ) $ 197,829 Frontier Select Fund Investments in Unconsolidated Trading Companies $ (91,989 ) The total change in unrealized appreciation (depreciation) included in the statements of operations attributable to level 3 investments still held at December 31, 2019. Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Balanced Fund Frontier Heritage Fund Swap Contracts $ 464,169 $ (116,581 ) $ 1,149,845 $ (67,436 ) Frontier Select Fund Investments in Unconsolidated Trading Companies $ (32,694 ) The total change in unrealized appreciation (depreciation) included in the statements of operations attributable to level 3 investments still held at December 31, 2018. Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Balanced Fund Frontier Heritage Fund Swap Contracts $ 643,941 $ 82,063 $ 1,453,948 $ (138,923 )
Frontier Funds [Member]
Schedule of financial asset portfolio measured at fair value	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 December 31, 2019 Level 1 Level 2 Level 3 Fair Open Trade Equity (Deficit) $ 57,056 $ 59,128 $ - $ 116,184 Swap Contracts - - 21,579,865 21,579,865 U.S. Treasury Securities 650,728 - - 650,728
Schedule of change in unrealized appreciation (depreciation)	For the Year ended 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 $ - For the Year ended Balance of recurring Level 3 assets as of January 1, 2019 $ 20,149,868 Total gains or losses (realized/unrealized): Included in earnings-realized - Included in earnings-unrealized 1,429,997 Proceeds from collateral reduction - Purchase of investments - Sale of investments - Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2019 $ 21,579,865 For the Year ended Balance of recurring Level 3 assets as of January 1, 2018 $ 21,208,838 Total gains or losses (realized/unrealized): Included in earnings-realized - Included in earnings-unrealized 2,041,028 Proceeds from collateral reduction (3,099,998 ) Purchase of investments - Sale of investments - Transfers in and/or out of Level 3 - Balance of recurring Level 3 assets as of December 31, 2018 $ 20,149,868

Swap Contracts (Tables)

Swap Contracts (Tables)	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Schedule of Investments in following swap	The Series have invested in the following swaps as of and for the year ended December 31, 2020: Frontier Balanced Fund Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Heritage Fund Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 $ (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 The Series have invested in the following swaps as of and for the year ended December 31, 2019: Frontier Balanced Fund Frontier Diversified Fund Frontier Long/Short Commodity Fund Frontier Heritage Fund Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Notional Amount $ 7,420,403 $ 1,761,834 $ 653,610 $ 2,072,056 Termination Date 7/31/2023 7/31/2023 7/31/2023 3/27/2023 Cash Collateral $ 86,000 $ 86,000 $ 29,950 $ 975,450 Swap Value $ 11,858,754 $ 6,298,583 $ 332,571 $ 1,912,559 Investee Returns Total Returns Total Returns Total Returns Total Returns Realized Gain/(Loss) $ 0 $ 0 $ 0 $ 0 Change in Unrealized Gain/(Loss) $ 1,149,846 $ 464,169 $ (116,581 ) $ (67,435 ) Fair Value as of December 31, 2019 $ 11,944,754 $ 6,384,583 $ 362,521 $ 2,888,009 Advance on swap appreciation $ (6,176,555 ) $ (4,000,000 ) $ (115,000 ) $ (1,900,000 )
Frontier Funds [Member]
Schedule of Investments in following swap	The Trust had invested in the following swaps as of and for the year ended December 31, 2020: XXXIV Balanced select swap XXXV Diversified select swap XXXVII L/S select swap Brevan Howard Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Deutsche Bank AG Realized Gain/(Loss) $ (2,448,166 ) $ (446,306 ) $ 188,100 ($ 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 The Trust had invested in the following swaps as of and for the year ended December 31, 2019: XXXIV Balanced select swap XXXV Diversified select swap XXXVII L/S Brevan Howard Total Return Swap Total Return Swap Total Return Swap Total Return Swap Counterparty Deutsche Deutsche Deutsche Deutsche Notional Amount $ 7,420,403 $ 1,761,834 $ 653,610 $ 2,072,056 Termination Date 7/31/2023 7/31/2023 7/31/2023 3/27/2023 Cash Collateral $ 86,000 $ 86,000 $ 29,950 $ 975,450 Swap Value $ 11,858,754 $ 6,298,583 $ 332,571 $ 1,912,559 Investee Returns Total Returns Total Returns Total Returns Total Returns Realized Gain/(Loss) $ 0 $ 0 $ 0 $ 0 Change in Unrealized Gain/(Loss) $ 1,149,846 $ 464,169 $ (116,581 ) $ (67,435 ) Fair Value as of December 31, 2019 $ 11,944,754 $ 6,384,583 $ 362,521 $ 2,888,009 Advance on swap appreciation $ (6,176,555 ) $ (4,000,000 ) $ (115,000 ) $ (1,900,000 )

Investments in Unconsolidated_2

Investments in Unconsolidated Trading Companies and Private Investment Companies (Tables)	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Schedule of investments in unconsolidated trading companies	As of December 31, 2020 As of December 31, 2019 Percentage of Percentage of Series Total Series Total Capital Invested in Capital Invested in Series Unconsolidated Trading Companies Fair Value Unconsolidated Trading Companies Fair Value Frontier Diversified Series — Frontier Trading Company XXXVIII 0.40 % $ 16,669 0.20 % $ 24,150 Frontier Masters Fund — Frontier Trading Company XXXVIII 0.09 % $ 907 0.49 % $ 11,005 Frontier Long/Short Commodity Fund — Frontier Trading Company XXXVIII 1.35 % $ 17,736 1.10 % $ 14,711 Frontier Balanced Fund — Frontier Trading Company XXXVIII 0.41 % $ 49,755 0.23 % $ 50,867 Frontier Select Fund — Frontier Trading Companies XXXVIII and XXXIX* 0.00 % $ - 17.94 % $ 505,355 Frontier Global Fund — Frontier Trading Company XXXVIII 0.04 % $ 1,083 0.25 % $ 11,818 Frontier Heritage Fund — Frontier Trading Company XXXVIII 0.12 % $ 2,880 0.57 % $ 18,891 * The investment in Frontier Trading Company XXXIX was sold as of June 30, 2020.
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 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 Notice Period Permitted Restrictions Frontier Funds Multi-Strategy Galaxy Plus Fund – JL Cyril Systematic Feeder Fund (547) LLC) 24 hours Daily None Galaxy Plus Fund - Welton GDP Feeder Fund (538) LLC 24 hours Daily None 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 Frontier Funds [Member]	12 Months Ended
	Dec. 31, 2020
Schedule of fees earned by managing owner	For the Year Ended December 31, 2020 Incentive Management Service Trading Frontier Diversified Fund - - 14,246 251,203 Frontier Masters Fund - - 1,786 101,300 Frontier Long/Short Commodity Fund - - 381 32,628 Frontier Balanced Fund - 19,600 351,503 580,978 Frontier Select Fund - - 62,144 53,759 Frontier Global Fund - - 100,858 186,591 Frontier Heritage Fund - - 66,761 104,941 For the Year Ended December 31, 2019 Incentive Management Service Trading Frontier Diversified Fund - $ 2,668 $ 44,726 $ 493,585 Frontier Masters Fund - 7,665 11,635 213,153 Frontier Long/Short Commodity Fund - - 562 54,334 Frontier Balanced Fund - 22,377 606,359 972,678 Frontier Select Fund - - 102,692 85,589 Frontier Global Fund - 38,679 177,833 278,497 Frontier Heritage Fund - 7,289 84,518 118,979 For the Year Ended December 31, 2018 Incentive Management Service Trading Frontier Diversified Fund (4,499 ) $ 44,289 $ 58,473 $ 591,665 Frontier Masters Fund - 108,413 49,049 420,391 Frontier Long/Short Commodity Fund (3,789 ) - 1,653 82,890 Frontier Balanced Fund 145,134 77,495 920,570 1,378,226 Frontier Select Fund - - 132,408 117,056 Frontier Global Fund - 487,698 318,897 307,053 Frontier Heritage Fund 697 120,602 123,257 142,735
Schedule of fees payable to managing owner	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 As of December 31, 2019 Incentive Management Interest Service Trading Frontier Diversified Fund $ - $ - $ - $ 3,391 $ 35,877 Frontier Masters Fund - - - 204 11,673 Frontier Long/Short Commodity Fund - - - - 3,468 Frontier Balanced Fund - 8,795 105 41,635 70,179 Frontier Select Fund - - - 6,906 6,000 Frontier Global Fund - - 56 11,263 22,540 Frontier Heritage Fund - - 166 5,362 11,170
Schedule of interest paid by each series to managing owner	2020 2019 2018 2020 2019 2018 Gross Amount Gross Amount Gross Amount Ratio to Average Ratio to Average Ratio to Average Frontier Diversified Fund Class 1 128,397 $ - $ - 33.62 % 0.00 % 0.00 % Frontier Diversified Fund Class 2 791,849 - - 29.93 % 0.00 % 0.00 % Frontier Diversified Fund Class 3 617,154 - - 14.78 % 0.00 % 0.00 % Frontier Masters Fund Class 1 219 - - 2.00 % 0.00 % 0.00 % Frontier Masters Fund Class 2 1,567 - - 0.25 % 0.00 % 0.00 % Frontier Masters Fund Class 3 - - - 0.00 % 0.00 % 0.00 % Frontier Long/Short Commodity Fund Class 2 27 14 141 0.07 % 0.02 % 0.00 % Frontier Long/Short Commodity Fund Class 3 703 337 1,902 0.07 % 0.02 % 0.39 % Frontier Balanced Fund Class 1 7,387 3,925 47,797 0.06 % 0.02 % 0.16 % Frontier Balanced Fund Class 1AP 103 64 (1,082 ) 0.06 % 0.02 % -0.21 % Frontier Balanced Fund Class 2 1,484 764 8,556 0.06 % 0.02 % 0.16 % Frontier Balanced Fund Class 2a 17 10 (237 ) 0.01 % 0.00 % -0.06 % Frontier Balanced Fund Class 3a 80 32 (520 ) 0.01 % 0.00 % -0.05 % Frontier Select Fund Class 1 4,514 5,563 8,986 0.22 % 0.16 % 0.10 % Frontier Select Fund Class 1AP 24 15 39 0.24 % 0.19 % 0.13 % Frontier Select Fund Class 2 173 174 919 0.23 % 0.16 % 0.11 % Frontier Global Fund Class 1 3,110 23,787 122,387 0.09 % 0.40 % 3.30 % Frontier Global Fund Class 1AP 28 114 623 0.10 % 0.33 % 0.01 % Frontier Global Fund Class 2 238 1,386 10,552 0.09 % 0.35 % 0.17 % Frontier Heritage Fund Class 1 5,141 5,323 18,510 0.23 % 0.19 % 0.70 % Frontier Heritage Fund Class 1AP 20 9 13 0.24 % 0.15 % 0.00 % Frontier Heritage Fund Class 2 847 1,088 2,948 0.20 % 0.18 % 0.10 % Total $ 1,563,082 $ 42,605 $ 221,534

Financial Highlights (Tables)

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Schedule of financial highlights of trust	For the year ended December 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 0.01 0.01 0.01 0.09 0.12 0.11 0.14 0.25 0.16 0.27 0.17 Expenses (6.39 ) (3.65 ) (3.23 ) (14.02 ) (4.83 ) (4.51 ) (3.09 ) (2.09 ) (1.34 ) (2.19 ) (1.41 ) Net gain/(loss) on investments, net of non-controlling interests (22.03 ) (28.98 ) (27.06 ) (3.17 ) (14.93 ) (13.86 ) (41.24 )* 6.22 3.91 6.49 4.30 Net income/(loss) (28.42 ) (32.63 ) (30.28 ) (17.10 ) (19.64 ) (18.27 ) (44.20 )* 4.39 2.74 4.56 3.05 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 Ratios to average net assets Net investment income/(loss) -7.33 % -3.60 % -3.60 % -22.42 % -6.13 % -6.13 % -6.61 % -2.21 % -2.21 % -2.21 % -2.21 % Expenses before incentive fees (3)(4) 7.34 % 3.61 % 3.61 % 22.57 % 6.28 % 6.28 % 6.91 % 2.51 % 2.51 % 2.51 % 2.51 % Expenses after incentive fees (3)(4) 7.34 % 3.61 % 3.61 % 22.57 % 6.28 % 6.28 % 6.91 % 2.51 % 2.51 % 2.51 % 2.51 % Total return before incentive fees (2) -28.11 % -26.84 % -26.65 % -23.66 % -22.53 % -22.33 % -1.63 %* 5.38 % 5.20 % 5.33 % 5.52 % Total return after incentive fees (2) -28.11 % -26.84 % -26.65 % -23.66 % -22.53 % -22.33 % -1.63 %* 5.38 % 5.20 % 5.33 % 5.52 % 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 0.04 0.04 0.06 0.05 0.05 0.00 0.00 0.00 Expenses (6.16 ) (4.17 ) (5.64 ) (4.92 ) (4.87 ) (3.40 ) (1.82 ) (2.42 ) Net gain/(loss) on investments, net of non-controlling interests (31.19 ) (36.87 ) (49.70 ) (42.97 ) (42.87 ) (4.60 ) (5.70 ) (7.32 ) Net income/(loss) (37.31 ) (41.00 ) (55.28 ) (47.84 ) (47.69 ) (8.01 ) (7.52 ) (9.74 ) Net asset value, December 31, 2020 $ 79.93 $ 96.81 $ 130.54 $ 113.20 $ 112.81 $ 58.55 $ 70.99 $ 94.20 Ratios to average net assets Net investment income/(loss) -6.98 % -3.99 % -3.99 % -3.99 % -3.99 % -5.49 % -2.49 % -2.49 % Expenses before incentive fees (3)(4) 7.03 % 4.03 % 4.03 % 4.03 % 4.03 % 5.49 % 2.49 % 2.49 % Expenses after incentive fees (3)(4) 7.03 % 4.03 % 4.03 % 4.03 % 4.03 % 5.49 % 2.49 % 2.49 % Total return before incentive fees (2) -31.82 % -29.75 % -29.75 % -29.71 % -29.71 % -12.03 % -9.58 % -9.37 % Total return after incentive fees (2) -31.82 % -29.75 % -29.75 % -29.71 % -29.71 % -12.03 % -9.58 % -9.37 % 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 (9.95 ) (7.59 ) (9.47 ) (6.76 ) (4.58 ) (6.26 ) Net gain/(loss) on investments, net of non-controlling interests (10.67 ) (146.84 )* (15.79 ) 5.33 6.93 8.58 Net income/(loss) (20.62 ) (154.43 )* (25.26 ) (1.44 ) 2.35 2.32 Net asset value, December 31, 2020 $ 110.90 $ - * $ 167.56 $ 96.10 $ 116.50 $ 155.92 Ratios to average net assets Net investment income/(loss) -8.11 % -5.12 % -5.12 % -6.93 % -3.93 % -3.93 % Expenses before incentive fees (3)(4) 8.11 % 5.12 % 5.12 % 6.93 % 3.93 % 3.93 % Expenses after incentive fees (3)(4) 8.11 % 5.12 % 5.12 % 6.93 % 3.93 % 3.93 % Total return before incentive fees (2) -15.68 % -23.34 %* -13.10 % -1.47 % 2.06 % 1.51 % Total return after incentive fees (2) -15.68 % -23.34 %* -13.10 % -1.47 % 2.06 % 1.51 % (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 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. For the year ended December 31, 2019 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, 2018 $ 102.25 $ 120.84 $ 112.62 $ 91.10 $ 107.68 $ 100.77 $ 56.80 $ 98.82 $ 66.52 $ 103.66 $ 69.83 Net operating results: Interest income 0.15 0.17 0.16 0.11 0.13 0.12 0.05 0.10 0.06 0.10 0.06 Expenses (6.83 ) (4.47 ) (4.17 ) (7.39 ) (6.11 ) (5.75 ) (3.24 ) (2.57 ) (1.62 ) (2.70 ) (1.70 ) Net gain/(loss) on investments, net of non-controlling interests 5.54 5.03 4.99 (11.54 ) (14.52 ) (13.36 ) (9.41 ) (14.74 ) (12.41 ) (15.41 ) (12.88 ) Net income/(loss) (1.15 ) 0.74 0.98 (18.82 ) (20.49 ) (18.98 ) (12.60 ) (17.22 ) (13.97 ) (18.02 ) (14.51 ) 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 Ratios to average net assets Net investment income/(loss) -6.58 % -3.55 % -3.55 % -8.52 % -5.91 % -5.91 % -6.45 % -2.67 % -2.67 % -2.67 % -2.67 % Expenses before incentive fees (3)(4) 6.73 % 3.70 % 3.70 % 8.65 % 6.04 % 6.04 % 6.55 % 2.77 % 2.77 % 2.77 % 2.77 % Expenses after incentive fees (3)(4) 6.73 % 3.70 % 3.70 % 8.65 % 6.04 % 6.04 % 6.55 % 2.77 % 2.77 % 2.77 % 2.77 % Total return before incentive fees (2) -1.12 % 0.61 % 0.87 % -20.66 % -19.03 % -18.84 % -22.19 % -17.43 % -21.00 % -17.38 % -20.79 % Total return after incentive fees (2) -1.12 % 0.61 % 0.87 % -20.66 % -19.03 % -18.84 % -22.19 % -17.43 % -21.00 % -17.38 % -20.79 % 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, 2018 $ 117.63 $ 134.16 $ 180.94 $ 156.81 $ 156.26 $ 71.41 $ 82.48 $ 108.18 Net operating results: Interest income 0.21 0.24 0.33 0.28 0.28 (0.00 ) 0.00 (0.00 ) Expenses (8.01 ) (5.25 ) (7.08 ) (6.12 ) (6.12 ) (3.93 ) (2.09 ) (2.69 ) Net gain/(loss) on investments, net of non-controlling interests 7.40 8.66 11.63 10.08 10.08 (0.93 ) (1.88 ) (1.55 ) Net income/(loss) (0.40 ) 3.65 4.88 4.23 4.24 (4.86 ) (3.97 ) (4.24 ) Net asset value, December 31, 2019 $ 117.23 $ 137.81 $ 185.82 $ 161.04 $ 160.50 $ 66.56 $ 78.51 $ 103.94 Ratios to average net assets Net investment income/(loss) -6.73 % -3.73 % -3.73 % -3.73 % -3.73 % -5.42 % -2.42 % -2.42 % Expenses before incentive fees (3)(4) 6.91 % 3.91 % 3.91 % 3.91 % 3.91 % 5.42 % 2.42 % 2.42 % Expenses after incentive fees (3)(4) 6.91 % 3.91 % 3.91 % 3.91 % 3.91 % 5.42 % 2.42 % 2.42 % Total return before incentive fees (2) -0.34 % 2.72 % 2.70 % 2.70 % 2.71 % -6.80 % -4.81 % -3.92 % Total return after incentive fees (2) -0.34 % 2.72 % 2.70 % 2.70 % 2.71 % -6.80 % -4.81 % -3.92 % Frontier Global Fund (Formerly 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, 2018 $ 131.57 $ 149.92 $ 187.17 $ 99.83 $ 111.78 $ 152.53 Net operating results: Interest income (0.00 ) (0.00 ) (0.00 ) (0.00 ) 0.00 (0.00 ) Expenses (11.16 ) (8.15 ) (10.11 ) (6.90 ) (4.62 ) (5.93 ) Net gain/(loss) on investments, net of non-controlling interests 11.11 12.66 15.76 4.61 7.00 7.00 Net income/(loss) (0.05 ) 4.51 5.65 (2.29 ) 2.37 1.06 Net asset value, December 31, 2019 $ 131.52 $ 154.43 $ 192.82 $ 97.54 $ 114.15 $ 153.59 Ratios to average net assets Net investment income/(loss) -7.99 % -4.99 % -4.99 % -6.71 % -3.70 % -3.70 % Expenses before incentive fees (3)(4) 7.99 % 4.99 % 4.99 % 6.71 % 3.70 % 3.70 % Expenses after incentive fees (3)(4) 7.99 % 4.99 % 4.99 % 6.71 % 3.70 % 3.70 % Total return before incentive fees (2) -0.04 % 3.01 % 3.02 % -2.30 % 2.12 % 0.70 % Total return after incentive fees (2) -0.04 % 3.01 % 3.02 % -2.30 % 2.12 % 0.70 % (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 year ended December 31, 2018 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, 2017 $ 116.41 $ 135.19 $ 125.68 $ 114.74 $ 133.27 $ 124.40 $ 81.35 $ 115.81 $ 93.59 $ 121.50 $ 97.99 Net operating results: Interest income 0.21 0.24 0.23 0.30 0.35 0.33 0.28 0.41 0.31 0.42 0.33 Expenses (7.04 ) (4.43 ) (4.13 ) (9.05 ) (8.14 ) (7.55 ) (4.71 ) (2.61 ) (2.01 ) (2.71 ) (2.12 ) Net gain/(loss) on investments, net of non-controlling interests (7.33 ) (10.16 ) (9.16 ) (14.88 ) (17.80 ) (16.41 ) (20.12 ) (14.79 ) (25.38 ) (15.56 ) (26.37 ) Net income/(loss) (14.16 ) (14.35 ) (13.06 ) (23.64 ) (25.59 ) (23.63 ) (24.55 ) (16.99 ) (27.07 ) (17.84 ) (28.16 ) Net asset value, December 31, 2018 $ 102.25 $ 120.84 $ 112.62 $ 91.10 $ 107.68 $ 100.77 $ 56.80 $ 98.82 $ 66.52 $ 103.66 $ 69.83 Ratios to average net assets Net investment income/(loss) -8.66 % -4.56 % -4.56 % -12.07 % -9.10 % -9.10 % -7.95 % -2.73 % -2.73 % -2.73 % -2.74 % Expenses before incentive fees (3)(4) 8.95 % 4.85 % 4.85 % 12.47 % 9.51 % 9.51 % 8.56 % 3.34 % 3.34 % 3.34 % 3.38 % Expenses after incentive fees (3)(4) 8.92 % 4.82 % 4.82 % 12.47 % 9.51 % 9.51 % 8.45 % 3.23 % 3.23 % 3.23 % 3.24 % Total return before incentive fees (2) -12.19 % -10.64 % -10.42 % -20.60 % -19.20 % -19.00 % -30.29 % -14.78 % -29.04 % -14.80 % -28.88 % Total return after incentive fees (2) -12.16 % -10.61 % -10.39 % -20.60 % -19.20 % -19.00 % 30.18 % -14.67 % -28.92 % -14.68 % -28.74 % 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, 2017 $ 135.96 $ 150.56 $ 202.90 $ 175.77 $ 175.18 $ 90.27 $ 100.02 $ 132.73 Net operating results: Interest income 0.12 0.14 0.19 0.16 0.16 0.00 0.00 0.00 Expenses (8.93 ) (5.90 ) (7.95 ) (6.89 ) (6.87 ) (4.19 ) (2.15 ) (2.94 ) Net gain/(loss) on investments, net of non-controlling interests (9.52 ) (10.64 ) (14.20 ) (12.23 ) (12.21 ) (14.67 ) (15.39 ) (21.61 ) Net income/(loss) (18.33 ) (16.40 ) (21.96 ) (18.96 ) (18.92 ) (18.86 ) (17.54 ) (24.55 ) Net asset value, December 31, 2018 $ 117.63 $ 134.16 $ 180.94 $ 156.81 $ 156.26 $ 71.41 $ 82.48 $ 108.18 Ratios to average net assets Net investment income/(loss) -9.49 % -5.48 % -5.48 % -5.48 % -5.48 % -7.38 % -3.37 % -3.37 % Expenses before incentive fees (3)(4) 9.24 % 5.23 % 5.23 % 5.23 % 5.23 % 7.38 % 3.37 % 3.37 % Expenses after incentive fees (3)(4) 9.62 % 5.62 % 5.62 % 5.62 % 5.62 % 7.38 % 3.37 % 3.37 % Total return before incentive fees (2) -13.10 % -10.51 % -10.44 % -10.41 % -10.42 % -20.89 % -17.54 % -18.50 % Total return after incentive fees (2) -13.48 % -10.89 % -10.82 % -10.79 % -10.80 % -20.89 % -17.54 % -18.50 % Frontier Winton 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, 2017 $ 159.08 $ 176.44 $ 216.50 $ 121.19 $ 134.28 $ 179.70 Net operating results: Interest income (0.00 ) (0.00 ) 0.01 (0.00 ) 0.00 (0.00 ) Expenses (14.29 ) (11.05 ) (14.12 ) (10.86 ) (8.95 ) (11.58 ) Net gain/(loss) on investments, net of non-controlling interests (13.22 ) (15.47 ) (15.21 ) (10.50 ) (13.55 ) (15.59 ) Net income/(loss) (27.51 ) (26.52 ) (29.33 ) (21.36 ) (22.50 ) (27.17 ) Net asset value, December 31, 2018 $ 131.57 $ 149.92 $ 187.17 $ 99.83 $ 111.78 $ 152.53 Ratios to average net assets Net investment income/(loss) -13.50 % -9.49 % -9.49 % -11.85 % -7.84 % -7.84 % Expenses before incentive fees (3)(4) 13.50 % 9.49 % 9.49 % 11.84 % 7.83 % 7.83 % Expenses after incentive fees (3)(4) 13.50 % 9.49 % 9.49 % 11.85 % 7.84 % 7.84 % Total return before incentive fees (2) -17.29 % -15.03 % -13.55 % -17.61 % -16.74 % -15.11 % Total return after incentive fees (2) -17.29 % -15.03 % -13.55 % -17.63 % -16.76 % -15.12 % (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	2020 2019 2018 2017 Ratios to average net assets (1) Net investment income/(loss) (1) -5.71 % -5.54 % -6.27 % -5.50 % Expenses before incentive fees (3) (4) -5.75 % -5.71 % -6.37 % 4.48 % Expenses after incentive fees (3) (4) -5.75 % -5.71 % -6.52 % 5.75 % Total return before incentive fees (2) -32.58 % -1.89 % -16.86 % 3.62 % Total return after incentive fees (2) -32.58 % -1.89 % -17.01 % 2.35 % (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)	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Schedule of averages futures contracts	For the Year Ended December 31, 2020 Monthly average contracts: Bought Sold Frontier Balanced Fund 613 612 For the Year Ended December 31, 2019 Monthly average contracts: Bought Sold Frontier Balanced Fund 1,209 1,409 For the Year Ended December 31, 2018 Monthly average contracts: Bought Sold Frontier Balanced Fund 2,183 1,971
Schedule of realized trading revenue from futures, forwards and options	Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2020 Type of contract Frontier Balanced Agriculturals $ 147,013 Currencies 90,903 Energies 118,920 Interest rates 59,037 Metals 217,301 Stock indices (34,911 ) Realized trading income/(loss) (1) $ 598,263 Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Frontier Balanced Agriculturals $ 230,294 Currencies (104,140 ) Energies 124,324 Interest rates (43,735 ) Metals (71,367 ) Stock indices 151 Realized trading income/(loss) (1) $ 135,527 Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Frontier Balanced Agriculturals $ (20,839 ) Currencies (374,202 ) Energies 74,850 Interest rates (62,765 ) Metals 11,010 Stock indices (4,991 ) Realized trading income/(loss) (1) $ (376,937 ) (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 Year Ended December 31, 2020 Type of contract Frontier Balanced Agriculturals $ 27,115 Currencies 14,158 Energies (25,335 ) Interest rates 4,660 Metals (1,619 ) Stock indices 11,486 Change in unrealized trading income/(loss) (1) $ 30,465 Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Frontier Balanced Agriculturals $ (37,494 ) Currencies (127,586 ) Energies 9,624 Interest rates (4,922 ) Metals 26,498 Stock indices - Change in unrealized trading income/(loss) (1) $ (133,880 ) Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Frontier Balanced Agriculturals $ (16,846 ) Currencies (124,436 ) Energies (73,724 ) Interest rates 207,810 Metals 14,424 Stock indices 7,107 Change in unrealized trading income/(loss) (1) $ 14,335 (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 December 31, 2020 Gross Amounts of Gross Amounts Net Amounts Frontier Balanced Fund Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440 As of December 31, 2019 Gross Amounts of Gross Amounts offset Net Amounts Presented Frontier Balanced Fund Open Trade Equity/(Deficit) $ 154,778 $ (38,594 ) $ 116,184 Swap Contracts 11,944,753 - $ 11,944,753 Frontier Diversified Fund Swap Contracts $ 6,384,583 $ - $ 6,384,583 Frontier Long/Short Commodity Fund Swap Contracts $ 362,521 $ - $ 362,521 Frontier Heritage Fund Swap Contracts $ 2,888,009 $ - $ 2,888,009
Frontier Funds [Member]
Schedule of realized trading revenue from futures, forwards and options	Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2020 Type of contract Agriculturals $ 147,013 Currencies 90,903 Energies 118,920 Interest rates 59,037 Metals 217,301 Stock indices (34,911 ) Realized trading income/(loss) (1) $ 598,263 Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Agriculturals $ 215,822 Currencies (553,764 ) Energies (430,890 ) Interest rates 273,302 Metals (691,581 ) Stock indices (34,113 ) Realized trading income/(loss) (1) $ (1,221,224 ) Realized Trading Revenue from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Agriculturals $ 147,573 Currencies (1,078,570 ) Energies 1,399,946 Interest rates 54,450 Metals 752,938 Stock indices (594,823 ) Realized trading income/(loss) (1) Realized trading income/(loss) (1) $ 681,514 (1)
Schedule of net trading gain loss	Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2020 Type of contract Agriculturals $ 27,115 Currencies 14,158 Energies (25,335 ) Interest rates 4,660 Metals (1,619 ) Stock indices 11,486 Change in unrealized trading income/(loss) (1) $ 30,465 Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2019 Type of contract Agriculturals $ (92,782 ) Currencies 100,545 Energies 221,904 Interest rates (231,584 ) Metals 516,390 Stock indices 54,311 Change in unrealized trading income/(loss) (1) $ 568,784 Net Change in Open Trade Equity from Futures, Forwards and Options for the Year Ended December 31, 2018 Type of contract Metals $ (83,504 ) Currencies (682,646 ) Energies (642,839 ) Interest rates 494,997 Agriculturals (1,035,591 ) Stock indices (195,081 ) Change in unrealized trading income/(loss) (1) $ (2,144,664 ) (1)
Schedule of gross and net information about the Trust's assets and liabilities	As of December 31, 2020 Gross Amounts of recognized Derivative Assets/Liabilities Gross Amounts offset in the Statements of Financial Condition Net Amounts Presented in the Statements of Financial Condition Frontier Balanced Fund Open Trade Equity/(Deficit) $ 814,743 $ (714,303 ) $ 100,440 As of December 31, 2019 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) $ 154,778 $ (38,594 ) $ 116,184 Swap Contracts $ 21,579,866 - $ 21,579,866

Organization and Purpose (The S

Organization and Purpose (The Series of Frontier Funds) (Details) - The Series of Frontier Funds [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Organization and Purpose (Textual)
Managing owner contributions to the series of the trust percentage	1.00%
Aggregate initial and ongoing service fees	9.00%
Aggregate underwriting compensation percentage	10.00%
Percentage of assets invested in trading company	100.00%	100.00%
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]	12 Months Ended
	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%
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 Frontier Funds [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies (Textual)
Managing owner percentage	2.00%
Restricted cash	$ 321,638	$ 2,890,330
Gross income of the Trust constitutes qualifying income	90.00%
Incentive fees percentage	10.00%
Incentive fee, description	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.
Frontier Diversified Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	$ 22,650
Frontier Long/Short Commodity Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	393
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	346,855
Frontier Select Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	19,463
Frontier Global Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	154,671
Frontier Heritage Fund [Member]
Significant Accounting Policies (Textual)
Advance for service fee	$ 63,205
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 ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
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	$ 630,993	$ 598,042
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 2 and Class 2a [Member]
Significant Accounting Policies (Textual)
Service fee percentage	0.50%
Service fee charged to limited owners	0.25%
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%
Frontier Trading Company I LLC [Member]
Significant Accounting Policies (Textual)
Restricted cash	$ 2,890,330	$ 321,638

Fair Value Measurements (The Se

Fair Value Measurements (The Series of Frontier Funds) (Details) - The Series of the Frontier Funds [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Frontier Diversified Fund [Member]
Swap Contracts		$ 6,384,583
U.S. Treasury Securities	427,393	99,605
Frontier Diversified Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	16,669	24,150
Swap Contracts		6,384,583
U.S. Treasury Securities	427,393	99,605
Frontier Diversified Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	16,669	24,150
Swap Contracts
U.S. Treasury Securities	427,393	99,605
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
Swap Contracts		6,384,583
U.S. Treasury Securities
Frontier Masters Fund [Member]
Swap Contracts
U.S. Treasury Securities	23,245	45,391
Frontier Masters Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	907	11,005
U.S. Treasury Securities	23,245	45,391
Frontier Masters Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	907	11,005
U.S. Treasury Securities	23,245	45,391
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]
Swap Contracts		362,521
U.S. Treasury Securities	454,738	60,673
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	17,736	14,711
Swap Contracts		362,521
U.S. Treasury Securities	454,738	60,673
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	17,736	14,711
Swap Contracts
U.S. Treasury Securities	454,738	60,673
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
Swap Contracts
U.S. Treasury Securities
Frontier Long/Short Commodity Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
Swap Contracts		362,521
U.S. Treasury Securities
Frontier Balanced Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	49,755	50,867
Open Trade Equity (Deficit)	100,440	116,184
Swap Contracts		11,944,753
U.S. Treasury Securities	1,275,641	209,799
Frontier Balanced Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	49,755	50,867
Open Trade Equity (Deficit)	100,440	57,057
Swap Contracts
U.S. Treasury Securities	1,275,641	209,799
Frontier Balanced Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
Open Trade Equity (Deficit)		59,127
Swap Contracts
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)
Swap Contracts		11,944,753
U.S. Treasury Securities
Frontier Select Fund [Member]
Swap Contracts
U.S. Treasury Securities		108,603
Frontier Select Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies		505,355
U.S. Treasury Securities		108,603
Frontier Select Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies		26,331
U.S. Treasury Securities		108,603
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		479,024
U.S. Treasury Securities
Frontier Global Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	1,083	11,818
U.S. Treasury Securities	27,742	48,741
Frontier Global Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	1,083	11,818
U.S. Treasury Securities	27,742	48,741
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]
Swap Contracts		2,888,008
U.S. Treasury Securities	73,847	77,916
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member]
Investment in Unconsolidated Trading Companies	2,880	18,891
Swap Contracts		2,888,008
U.S. Treasury Securities	73,847	77,916
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Investment in Unconsolidated Trading Companies	2,880	18,891
Swap Contracts
U.S. Treasury Securities	73,847	77,916
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Investment in Unconsolidated Trading Companies
Swap Contracts
U.S. Treasury Securities
Frontier Heritage Fund [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Investment in Unconsolidated Trading Companies
Swap Contracts		2,888,008
U.S. Treasury Securities

Fair Value Measurements (The _2

Fair Value Measurements (The Series of Frontier Funds) (Details 1) - The Series of Frontier Funds [Member] - Level 3 Inputs [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Frontier Balanced Fund [Member] | Swap [Member]
Beginning, Balance of recurring Level 3 assets	$ 11,944,753	$ 10,794,908
Total gains or losses (realized/unrealized):
Included in earnings-realized	(2,448,166)
Included in earnings-unrealized	(3,088,917)	1,149,845
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		11,944,753
Frontier Long/Short Commodity Fund [Member] | Swap [Member]
Beginning, Balance of recurring Level 3 assets	362,521	479,102
Total gains or losses (realized/unrealized):
Included in earnings-realized	188,100
Included in earnings-unrealized	44,277	(116,581)
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		362,521
Frontier Diversified Fund [Member] | Swap [Member]
Beginning, Balance of recurring Level 3 assets	6,384,583	5,920,414
Total gains or losses (realized/unrealized):
Included in earnings-realized	(446,306)
Included in earnings-unrealized	(1,537,399)	464,169
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		6,384,583
Frontier Heritage Fund [Member] | Swap [Member]
Beginning, Balance of recurring Level 3 assets	2,888,009	2,955,444
Total gains or losses (realized/unrealized):
Included in earnings-realized	(97,745)
Included in earnings-unrealized	197,829	(67,435)
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		2,888,009
Frontier Select Fund [Member] | Investment in Unconsolidated Trading Companies [Member]
Beginning, Balance of recurring Level 3 assets	479,024	511,718
Total gains or losses (realized/unrealized):
Change in fair value of investments in unconsolidated trading companies	95,914	(32,694)
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		$ 479,024

Fair Value Measurements (The _3

Fair Value Measurements (The Series of Frontier Funds) (Details 2) - Swap Contracts [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
The Series of Frontier Funds [Member] | Frontier Diversified Fund [Member]
Total change in unrealized appreciation (depreciation)	$ (1,537,399)	$ 464,169	$ 643,941
The Series of Frontier Funds [Member] | Frontier Long/Short Commodity Fund [Member]
Total change in unrealized appreciation (depreciation)	44,277	(116,581)	82,063
The Series of Frontier Funds [Member] | Frontier Balanced Fund [Member]
Total change in unrealized appreciation (depreciation)	(3,088,917)	1,149,845	1,453,948
The Series of Frontier Funds [Member] | Frontier Heritage Fund [Member]
Total change in unrealized appreciation (depreciation)	197,829	(67,436)	$ (138,923)
Investments in Unconsolidated Trading Companies [Member] | Frontier Select Fund [Member]
Total change in unrealized appreciation (depreciation)	$ (91,989)	$ (32,694)

Fair Value Measurements (Fronti

Fair Value Measurements (Frontier Funds) (Details) - Fair Value, Measurements, Recurring [Member] - Frontier Funds [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Open Trade Equity (Deficit)	$ 100,440	$ 116,184
Swap Contracts		21,579,865
U.S. Treasury Securities	2,282,606	650,728
Level 1 Inputs [Member]
Open Trade Equity (Deficit)	100,440	57,056
Swap Contracts
U.S. Treasury Securities	2,282,606	650,728
Level 2 Inputs [Member]
Open Trade Equity (Deficit)		59,128
Swap Contracts
U.S. Treasury Securities
Level 3 Inputs [Member]
Open Trade Equity (Deficit)
Swap Contracts		21,579,865
U.S. Treasury Securities

Fair Value Measurements (Fron_2

Fair Value Measurements (Frontier Funds) (Details 1) - Level 3 Inputs [Member] - Frontier Funds [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Beginning, Balance of recurring Level 3 assets	$ 21,579,865	$ 20,149,868	$ 21,208,838
Total gains or losses (realized/unrealized):
Included in earnings-realized	(2,896,106)
Included in earnings-unrealized	(4,384,210)	1,429,997	2,041,028
Proceeds from collateral reduction	(12,674,502)		(3,099,998)
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		$ 21,579,865	$ 20,149,868

Fair Value Measurements (Fron_3

Fair Value Measurements (Frontier Funds) (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Swap [Member] | Frontier Funds [Member]
Total change in unrealized appreciation (depreciation)	$ (4,384,210)	$ 1,429,997

Swap Contracts (The Series of t

Swap Contracts (The Series of the Frontier Funds) (Details) - The Series of Frontier Funds [Member] - Swap [Member] - DeutscheBank AG [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Frontier Balanced Fund [Member]
Notional Amount		$ 7,420,403
Termination Date		Jul. 31, 2023
Cash Collateral		$ 86,000
Swap Value		$ 11,858,754
Investee Returns		Total Returns
Realized Gain/(Loss)	$ (2,448,166)	$ 0
Change in Unrealized Gain/(Loss)	(3,088,917)	1,149,846
Fair Value	0	11,944,754
Advance on swap appreciation	0	(6,176,555)
Frontier Diversified Fund [Member]
Notional Amount		$ 1,761,834
Termination Date		Jul. 31, 2023
Cash Collateral		$ 86,000
Swap Value		$ 6,298,583
Investee Returns		Total Returns
Realized Gain/(Loss)	(446,306)	$ 0
Change in Unrealized Gain/(Loss)	(1,537,399)	464,169
Fair Value	0	6,384,583
Advance on swap appreciation	0	(4,000,000)
Frontier Long/Short Commodity Fund [Member]
Notional Amount		$ 653,610
Termination Date		Jul. 31, 2023
Cash Collateral		$ 29,950
Swap Value		$ 332,571
Investee Returns		Total Returns
Realized Gain/(Loss)	188,100	$ 0
Change in Unrealized Gain/(Loss)	44,277	(116,581)
Fair Value	0	362,521
Advance on swap appreciation	0	(115,000)
Frontier Heritage Fund [Member]
Notional Amount		$ 2,072,056
Termination Date		Mar. 27, 2023
Cash Collateral		$ 975,450
Swap Value		$ 1,912,559
Investee Returns		Total Returns
Realized Gain/(Loss)	(97,745)	$ 0
Change in Unrealized Gain/(Loss)	197,829	(67,435)
Fair Value	0	2,888,009
Advance on swap appreciation	$ 0	$ (1,900,000)

Swap Contracts (The Series of_2

Swap Contracts (The Series of the Frontier Funds) (Details Textual) - The Series of Frontier Funds [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Swap Contracts (The Series of the Frontier Funds) (Textual)
Percentage of trust's assets were deposited with over-the-counter counterparties	0.00%	2.40%
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] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
XXXIV Balanced Select Swap [Member]
Counterparty
Notional Amount		$ 7,420,403
Termination Date		Jul. 31, 2023
Cash Collateral		$ 86,000
Swap Value		$ 11,858,754
Investee Returns		Total Returns
Realized Gain/(Loss)	$ (2,448,166)	$ 0
Change in Unrealized Gain/(Loss)	(3,088,917)	1,149,846
Fair Value	0	11,944,754
Advance on swap appreciation	0	(6,176,555)
XXXV Diversified Select Swap [Member]
Counterparty
Notional Amount		$ 1,761,834
Termination Date		Jul. 31, 2023
Cash Collateral		$ 86,000
Swap Value		$ 6,298,583
Investee Returns		Total Returns
Realized Gain/(Loss)	(446,306)	$ 0
Change in Unrealized Gain/(Loss)	(1,537,399)	464,169
Fair Value	0	6,384,583
Advance on swap appreciation	0	(4,000,000)
XXXVII L/S Select Swap [Member]
Counterparty
Notional Amount		$ 653,610
Termination Date		Jul. 31, 2023
Cash Collateral		$ 29,950
Swap Value		$ 332,571
Investee Returns		Total Returns
Realized Gain/(Loss)	188,100	$ 0
Change in Unrealized Gain/(Loss)	44,277	(116,581)
Fair Value	0	362,521
Advance on swap appreciation	0	(115,000)
Brevan Howard [Member]
Counterparty
Notional Amount		$ 2,072,056
Termination Date		Mar. 27, 2023
Cash Collateral		$ 975,450
Swap Value		$ 1,912,559
Investee Returns		Total Returns
Realized Gain/(Loss)	(97,745)	$ 0
Change in Unrealized Gain/(Loss)	197,829	(67,435)
Fair Value	0	2,888,009
Advance on swap appreciation	$ 0	$ (1,900,000)

Swap Contracts (Frontier Fund_2

Swap Contracts (Frontier Funds) (Details Textual) - Frontier Funds [Member] - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Swaps Contracts (Textual)
Description of deposits assets	2.4% or $1,177,400
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 Frontier Funds [Member] - USD ($)		Dec. 31, 2020	Dec. 31, 2019
Frontier Diversified Fund [Member]
Fair Value		$ 16,669	$ 24,150
Frontier Diversified Fund [Member] | Frontier Trading XXXVIII [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies		0.40%	0.20%
Fair Value		$ 16,669	$ 24,150
Frontier Masters Fund [Member]
Fair Value		$ 907	$ 11,005
Frontier Masters Fund [Member] | Frontier Trading XXXVIII [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies		0.09%	0.49%
Fair Value		$ 907	$ 11,005
Frontier Long/Short Commodity Fund [Member]
Fair Value		$ 17,736	$ 14,711
Frontier Long/Short Commodity Fund [Member] | Frontier Trading Company XXXVIII [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies		1.35%	1.10%
Fair Value		$ 17,736	$ 14,711
Frontier Balanced Fund [Member] | Frontier Trading XXXVIII [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies		0.41%	0.23%
Fair Value		$ 49,755	$ 50,867
Frontier Select Fund [Member]
Fair Value			$ 505,355
Frontier Select Fund [Member] | Frontier Trading Companies XXXVIII and XXXIX [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies	[1]	0.00%	17.94%
Fair Value	[1]		$ 505,355
Frontier Global Fund (formerly Frontier Winton Fund) [Member]
Fair Value		$ 1,083	$ 11,818
Frontier Global Fund (formerly Frontier Winton Fund) [Member] | Frontier Trading XXXVIII [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies		0.04%	0.25%
Fair Value		$ 1,083	$ 11,818
Frontier Heritage Fund [Member]
Fair Value		$ 2,880	$ 18,891
Frontier Heritage Fund [Member] | Frontier Trading XXXVIII [Member]
Percentage of Series Total Capital Invested in Unconsolidated Trading Companies		0.12%	0.57%
Fair Value		$ 2,880	$ 18,891
[1]	The investment in Frontier Trading Company XXXIX was sold as of June 30, 2020.

Investments in Unconsolidated_4

Investments in Unconsolidated Trading Companies and Private Investment Companies (The Series of Frontier Funds) (Details 2) - The Series of Frontier Funds [Member]	12 Months Ended
	Dec. 31, 2020
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]	12 Months Ended
	Dec. 31, 2020
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
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 Frontier Funds [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Frontier Diversified Fund [Member]
Incentive (Rebate) Fees			$ (4,499)
Management Fee		2,668	44,289
Service Fee	14,246	44,726	58,473
Trading Fees	251,203	493,585	591,665
Frontier Masters Fund [Member]
Incentive (Rebate) Fees
Management Fee		7,665	108,413
Service Fee	1,786	11,635	49,049
Trading Fees	101,300	213,153	420,391
Frontier Long/Short Commodity Fund [Member]
Incentive (Rebate) Fees			(3,789)
Management Fee
Service Fee	381	562	1,653
Trading Fees	32,628	54,334	82,890
Frontier Balanced Fund [Member]
Incentive (Rebate) Fees			145,134
Management Fee	19,600	22,377	77,495
Service Fee	351,503	606,359	920,570
Trading Fees	580,978	972,678	1,378,226
Frontier Select Fund [Member]
Incentive (Rebate) Fees
Management Fee
Service Fee	62,144	102,692	132,408
Trading Fees	53,759	85,589	117,056
Frontier Global Fund [Member]
Incentive (Rebate) Fees
Management Fee		38,679	487,698
Service Fee	100,858	177,833	318,897
Trading Fees	186,591	278,497	307,053
Frontier Heritage Fund [Member]
Incentive (Rebate) Fees			697
Management Fee		7,289	120,602
Service Fee	66,761	84,518	123,257
Trading Fees	$ 104,941	$ 118,979	$ 142,735

Transactions with Affiliates _3

Transactions with Affiliates (The Series of Frontier Funds) (Details 1) - The Series of Frontier Funds [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Frontier Diversified Fund [Member]
Incentive Fees
Management Fees
Interest Fees
Service Fees	385	3,391
Trading fees payable	12,576	35,877
Frontier Masters Fund [Member]
Incentive Fees
Management Fees
Interest Fees
Service Fees	70	204
Trading fees payable	5,460	11,673
Frontier Long/Short Commodity Fund [Member]
Incentive Fees
Management Fees
Interest Fees	87
Service Fees	18
Trading fees payable	2,281	3,468
Frontier Balanced Fund [Member]
Incentive Fees
Management Fees	8,854	8,795
Interest Fees	1,376	105
Service Fees	21,381	41,635
Trading fees payable	37,894	70,179
Frontier Select Fund [Member]
Incentive Fees
Management Fees
Interest Fees	179
Service Fees	3,709	6,906
Trading fees payable	3,933	6,000
Frontier Global Fund [Member]
Incentive Fees
Management Fees
Interest Fees	326	56
Service Fees	6,348	11,263
Trading fees payable	11,849	22,540
Frontier Heritage Fund [Member]
Incentive Fees
Management Fees
Interest Fees	139	166
Service Fees	4,794	5,362
Trading fees payable	$ 7,705	$ 11,170

Transactions with Affiliates _4

Transactions with Affiliates (The Series of Frontier Funds) (Details 2) - The Series of Frontier Funds [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Managing Owner [Member]
Gross Amount Paid to the Managing Owner	$ 1,563,082	$ 42,605	$ 221,534
Frontier Diversified Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 128,397
Ratio to Average Net Assets	33.62%	0.00%	0.00%
Frontier Diversified Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 791,849
Ratio to Average Net Assets	29.93%	0.00%	0.00%
Frontier Diversified Fund [Member] | Class 3 [Member]
Gross Amount Paid to the Managing Owner	$ 617,154
Ratio to Average Net Assets	14.78%	0.00%	0.00%
Frontier Masters Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 219
Ratio to Average Net Assets	2.00%	0.00%	0.00%
Frontier Masters Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 1,567
Ratio to Average Net Assets	0.25%	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%	0.00%
Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 27	$ 14	$ 141
Ratio to Average Net Assets	0.07%	0.02%	0.00%
Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
Gross Amount Paid to the Managing Owner	$ 703	$ 337	$ 1,902
Ratio to Average Net Assets	0.07%	0.02%	0.39%
Frontier Balanced Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 7,387	$ 3,925	$ 47,797
Ratio to Average Net Assets	0.06%	0.02%	0.16%
Frontier Balanced Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 1,484	$ 764	$ 8,556
Ratio to Average Net Assets	0.06%	0.02%	0.16%
Frontier Balanced Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner	$ 103	$ 64	$ (1,082)
Ratio to Average Net Assets	0.06%	0.02%	(0.21%)
Frontier Balanced Fund [Member] | Class 2a [Member]
Gross Amount Paid to the Managing Owner	$ 17	$ 10	$ (237)
Ratio to Average Net Assets	0.01%	0.00%	(0.06%)
Frontier Balanced Fund [Member] | Class 3a [Member]
Gross Amount Paid to the Managing Owner	$ 80	$ 32	$ (520)
Ratio to Average Net Assets	0.01%	0.00%	(0.05%)
Frontier Select Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 4,514	$ 5,563	$ 8,986
Ratio to Average Net Assets	0.22%	0.16%	10.00%
Frontier Select Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 173	$ 174	$ 919
Ratio to Average Net Assets	0.23%	0.16%	0.11%
Frontier Select Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner	$ 24	$ 15	$ 39
Ratio to Average Net Assets	0.24%	0.19%	0.13%
Frontier Global Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 3,110	$ 23,787	$ 122,387
Ratio to Average Net Assets	0.09%	0.40%	3.30%
Frontier Global Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 238	$ 1,386	$ 10,552
Ratio to Average Net Assets	0.09%	0.35%	0.17%
Frontier Global Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner	$ 28	$ 114	$ 623
Ratio to Average Net Assets	0.10%	0.33%	0.01%
Frontier Heritage Fund [Member] | Class 1 [Member]
Gross Amount Paid to the Managing Owner	$ 5,141	$ 5,323	$ 18,510
Ratio to Average Net Assets	0.23%	0.19%	0.70%
Frontier Heritage Fund [Member] | Class 2 [Member]
Gross Amount Paid to the Managing Owner	$ 847	$ 1,088	$ 2,948
Ratio to Average Net Assets	0.20%	0.18%	0.10%
Frontier Heritage Fund [Member] | Class 1AP [Member]
Gross Amount Paid to the Managing Owner	$ 20	$ 9	$ 13
Ratio to Average Net Assets	0.24%	0.15%	0.00%

Transactions with Affiliates _5

Transactions with Affiliates (The Series of Frontier Funds) (Details Textual) - The Series of Frontier Funds [Member] - USD ($)	1 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2017
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					346,855
Frontier Long/Short Commodity Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee					393
Frontier Diversified Fund [Member]
Transactions with Affiliates (Textual)
Percentage of interest			0.25%
Subscriptions in advance for service fee					$ 22,650
Frontier Masters Fund [Member]
Transactions with Affiliates (Textual)
Percentage of interest						0.25%
Subscriptions in advance for service fee					$ 31,725
Frontier Global Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee					154,671
Frontier Select Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee					19,463
Frontier Heritage Fund [Member]
Transactions with Affiliates (Textual)
Subscriptions in advance for service fee					$ 63,205
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%				1.00%
Managing Owner [Member] | Frontier Balanced Fund [Member] | Class 1AP [Member]
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%				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%				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%				1.00%
Managing Owner [Member] | Frontier Heritage Fund [Member] | Swap [Member]
Transactions with Affiliates (Textual)
Percentage of management fee	1.00%				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 ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	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	$ 0	$ 0	$ 10,897
Trust had payable for management fees	8,854	8,795	78,045
Trust had payable for interest fees	2,107	327	10,852
Trust had payable for service fees	36,705	68,762	96,152
Trust had payable for trading fees	81,698	160,907	222,241
Trust paid for incentive fees	0	0	137,543
Trust paid for management fees	19,600	78,678	838,497
Trust paid for service fees	597,679	1,028,325	1,604,307
Trust paid for trading fees	1,311,400	2,216,815	3,040,016
Trust paid	$ 1,563,079	$ 42,605	$ 221,534
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	2.00%
Class 2 Units [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of service fee	0.25%
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%	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%
Percentage of interest is retained by respective series	100.00%
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%	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%
Percentage of interest is retained by respective series	100.00%
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%
Percentage of interest is retained by respective series	100.00%
Frontier Diversified Fund [Member] | Swap [Member]
Transactions with Affiliates (Frontier Funds) (Textual)
Percentage of management fee	1.00%	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%
Percentage of interest is retained by respective series	100.00%
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%	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		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Frontier Diversified Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 101.10		$ 102.25	$ 116.41
Net operating results:
Interest income	[1]	0.01		0.15	0.21
Expenses	[1]	(6.39)		(6.83)	(7.04)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(22.03)		5.54	(7.33)
Net income/(loss)	[1]	(28.42)		(1.15)	(14.16)
Net asset value	[1]	$ 72.68		$ 101.10	$ 102.25
Ratios to average net assets
Net investment income/(loss)		(7.33%)		(6.58%)	(8.66%)
Expenses before incentive fees	[2],[3]	7.34%		6.73%	8.95%
Expenses after incentive fees	[2],[3]	7.34%		6.73%	8.92%
Total return before incentive fees		(28.11%)		(1.12%)	(12.19%)
Total return after incentive fees		(28.11%)		(1.12%)	(12.16%)
Frontier Diversified Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 121.58		$ 120.84	$ 135.19
Net operating results:
Interest income	[1]	0.01		0.17	0.24
Expenses	[1]	(3.65)		(4.47)	(4.43)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(28.98)		5.03	(10.16)
Net income/(loss)	[1]	(32.63)		0.74	(14.35)
Net asset value	[1]	$ 88.95		$ 121.58	$ 120.84
Ratios to average net assets
Net investment income/(loss)		(3.60%)		(3.55%)	(4.56%)
Expenses before incentive fees	[2],[3]	3.61%		3.70%	4.85%
Expenses after incentive fees	[2],[3]	3.61%		3.70%	4.82%
Total return before incentive fees		(26.84%)		0.61%	(10.64%)
Total return after incentive fees		(26.84%)		0.61%	(10.61%)
Frontier Diversified Fund [Member] | Class 3 [Member]
Net asset value	[1]	$ 113.61		$ 112.62	$ 125.68
Net operating results:
Interest income	[1]	0.01		0.16	0.23
Expenses	[1]	(3.23)		(4.17)	(4.13)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(27.06)		4.99	(9.16)
Net income/(loss)	[1]	(30.28)		0.98	(13.06)
Net asset value	[1]	$ 83.33		$ 113.61	$ 112.62
Ratios to average net assets
Net investment income/(loss)		(3.60%)		(3.55%)	(4.56%)
Expenses before incentive fees	[2],[3]	3.61%		3.70%	4.85%
Expenses after incentive fees	[2],[3]	3.61%		3.70%	4.82%
Total return before incentive fees		(26.65%)		0.87%	(10.42%)
Total return after incentive fees		(26.65%)		0.87%	(10.39%)
Frontier Masters Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 72.28		$ 91.1	$ 114.74
Net operating results:
Interest income	[1]	0.09		0.11	0.3
Expenses	[1]	(14.02)		(7.39)	(9.05)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(3.17)		(11.54)	(14.88)
Net income/(loss)	[1]	(17.10)		(18.82)	(23.64)
Net asset value	[1]	$ 55.18		$ 72.28	$ 91.1
Ratios to average net assets
Net investment income/(loss)		(22.42%)		(8.52%)	(12.07%)
Expenses before incentive fees	[2],[3]	22.57%		8.65%	12.47%
Expenses after incentive fees	[2],[3]	22.57%		8.65%	12.47%
Total return before incentive fees		(23.66%)		(20.66%)	(20.60%)
Total return after incentive fees		(23.66%)		(20.66%)	(20.60%)
Frontier Masters Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 87.18		$ 107.68	$ 133.27
Net operating results:
Interest income	[1]	0.12		0.13	0.35
Expenses	[1]	(4.83)		(6.11)	(8.14)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(14.93)		(14.52)	(17.80)
Net income/(loss)	[1]	(19.64)		(20.49)	(25.59)
Net asset value	[1]	$ 67.54		$ 87.18	$ 107.68
Ratios to average net assets
Net investment income/(loss)		(6.13%)		(5.91%)	(9.10%)
Expenses before incentive fees	[2],[3]	6.28%		6.04%	9.51%
Expenses after incentive fees	[2],[3]	6.28%		6.04%	9.51%
Total return before incentive fees		(22.53%)		(19.03%)	(19.20%)
Total return after incentive fees		(22.53%)		(19.03%)	(19.20%)
Frontier Masters Fund [Member] | Class 3 [Member]
Net asset value	[1]	$ 81.78		$ 100.77	$ 124.4
Net operating results:
Interest income	[1]	0.11		0.12	0.33
Expenses	[1]	(4.51)		(5.75)	(7.55)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(13.86)		(13.36)	(16.41)
Net income/(loss)	[1]	(18.27)		(18.98)	(23.63)
Net asset value	[1]	$ 63.52		$ 81.78	$ 100.77
Ratios to average net assets
Net investment income/(loss)		(6.13%)		(5.91%)	(9.10%)
Expenses before incentive fees	[2],[3]	6.28%		6.04%	9.51%
Expenses after incentive fees	[2],[3]	6.28%		6.04%	9.51%
Total return before incentive fees		(22.33%)		(18.84%)	(19.00%)
Total return after incentive fees		(22.33%)		(18.84%)	(19.00%)
Frontier Long/Short Commodity Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 81.60		$ 98.82	$ 115.81
Net operating results:
Interest income	[1]	0.25		0.1	0.41
Expenses	[1]	(2.09)		(2.57)	(2.61)
Net gain/(loss) on investments, net of non-controlling interests	[1]	6.22		(14.74)	(14.79)
Net income/(loss)	[1]	4.39		(17.22)	(16.99)
Net asset value	[1]	$ 85.99		$ 81.60	$ 98.82
Ratios to average net assets
Net investment income/(loss)		(2.21%)		(2.67%)	(2.73%)
Expenses before incentive fees	[2],[3]	2.51%		2.77%	3.34%
Expenses after incentive fees	[2],[3]	2.51%		2.77%	3.23%
Total return before incentive fees		5.38%		(17.43%)	(14.78%)
Total return after incentive fees		5.38%		(17.43%)	(14.67%)
Frontier Long/Short Commodity Fund [Member] | Class 3 [Member]
Net asset value	[1]	$ 85.64		$ 103.66	$ 121.5
Net operating results:
Interest income	[1]	0.27		0.1	0.42
Expenses	[1]	(2.19)		(2.70)	(2.71)
Net gain/(loss) on investments, net of non-controlling interests	[1]	6.49		(15.41)	(15.56)
Net income/(loss)	[1]	4.56		(18.02)	(17.84)
Net asset value	[1]	$ 90.21		$ 85.64	$ 103.66
Ratios to average net assets
Net investment income/(loss)		(2.21%)		(2.67%)	(2.73%)
Expenses before incentive fees	[2],[3]	2.51%		2.77%	3.34%
Expenses after incentive fees	[2],[3]	2.51%		2.77%	3.23%
Total return before incentive fees		5.33%		(17.38%)	(14.80%)
Total return after incentive fees		5.33%		(17.38%)	(14.68%)
Frontier Long/Short Commodity Fund [Member] | Class 1a [Member]
Net asset value	[1]	$ 44.20		$ 56.8	$ 81.35
Net operating results:
Interest income	[1]	0.14		0.05	0.28
Expenses	[1]	(3.09)		(3.24)	(4.71)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(41.24)		(9.41)	(20.12)
Net income/(loss)	[1]	(44.20)		(12.60)	(24.55)
Net asset value	[1]			$ 44.20	$ 56.8
Ratios to average net assets
Net investment income/(loss)		(6.61%)		(645.00%)	(7.95%)
Expenses before incentive fees	[2],[3]	6.91%		655.00%	8.56%
Expenses after incentive fees	[2],[3]	6.91%		655.00%	8.45%
Total return before incentive fees		(1.63%)		(2219.00%)	(30.29%)
Total return after incentive fees		(1.63%)		(2219.00%)	30.18%
Frontier Long/Short Commodity Fund [Member] | Class 2a [Member]
Net asset value	[1]	$ 52.55		$ 66.52	$ 93.59
Net operating results:
Interest income	[1]	0.16		0.06	0.31
Expenses	[1]	(1.34)		(1.62)	(2.01)
Net gain/(loss) on investments, net of non-controlling interests	[1]	3.91		(12.41)	(25.38)
Net income/(loss)	[1]	2.74		(13.97)	(27.07)
Net asset value	[1]	$ 55.29		$ 52.55	$ 66.52
Ratios to average net assets
Net investment income/(loss)		(2.21%)		(2.67%)	(2.73%)
Expenses before incentive fees	[2],[3]	2.51%		2.77%	3.34%
Expenses after incentive fees	[2],[3]	2.51%		2.77%	3.23%
Total return before incentive fees		5.20%		(21.00%)	(29.04%)
Total return after incentive fees		5.20%		(21.00%)	(28.92%)
Frontier Long/Short Commodity Fund [Member] | Class 3a [Member]
Net asset value	[1]	$ 55.31		$ 69.83	$ 97.99
Net operating results:
Interest income	[1]	0.17		0.06	0.33
Expenses	[1]	(1.41)		(1.70)	(2.12)
Net gain/(loss) on investments, net of non-controlling interests	[1]	4.3		(12.88)	(26.37)
Net income/(loss)	[1]	3.05		(14.51)	(28.16)
Net asset value	[1]	$ 58.37		$ 55.31	$ 69.83
Ratios to average net assets
Net investment income/(loss)		(2.21%)		(2.67%)	(2.74%)
Expenses before incentive fees	[2],[3]	2.51%		2.77%	3.38%
Expenses after incentive fees	[2],[3]	2.51%		2.77%	3.24%
Total return before incentive fees		5.52%		(20.79%)	(28.88%)
Total return after incentive fees		5.52%		(20.79%)	(28.74%)
Frontier Balanced Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 117.23		$ 117.63	$ 135.96
Net operating results:
Interest income	[1]	0.04		0.21	0.12
Expenses	[1]	(6.16)		(8.01)	(8.93)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(31.19)		7.4	(9.52)
Net income/(loss)	[1]	(37.31)		(0.40)	(18.33)
Net asset value	[1]	$ 79.93		$ 117.23	$ 117.63
Ratios to average net assets
Net investment income/(loss)		(6.98%)		(6.73%)	(9.49%)
Expenses before incentive fees	[2],[3]	7.03%		6.91%	9.24%
Expenses after incentive fees	[2],[3]	7.03%		6.91%	9.62%
Total return before incentive fees		(31.82%)		(0.34%)	(13.10%)
Total return after incentive fees		(31.82%)		(0.34%)	(13.48%)
Frontier Balanced Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 185.82		$ 180.94	$ 202.9
Net operating results:
Interest income	[1]	0.06		0.33	0.19
Expenses	[1]	(5.64)		(7.08)	(7.95)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(49.70)		11.63	(14.20)
Net income/(loss)	[1]	(55.28)		4.88	(21.96)
Net asset value	[1]	$ 130.54		$ 185.82	$ 180.94
Ratios to average net assets
Net investment income/(loss)		(3.99%)		(3.73%)	(5.48%)
Expenses before incentive fees	[2],[3]	4.03%		3.91%	5.23%
Expenses after incentive fees	[2],[3]	4.03%		3.91%	5.62%
Total return before incentive fees		(29.75%)		2.70%	(10.44%)
Total return after incentive fees		(29.75%)		2.70%	(10.82%)
Frontier Balanced Fund [Member] | Class 2a [Member]
Net asset value	[1]	$ 161.04		$ 156.81	$ 175.77
Net operating results:
Interest income	[1]	0.05		0.28	0.16
Expenses	[1]	(4.92)		(6.12)	(6.89)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(42.97)		10.08	(12.23)
Net income/(loss)	[1]	(47.84)		4.23	(18.96)
Net asset value	[1]	$ 113.2		$ 161.04	$ 156.81
Ratios to average net assets
Net investment income/(loss)		(3.99%)		(3.73%)	(5.48%)
Expenses before incentive fees	[2],[3]	4.03%		3.91%	5.23%
Expenses after incentive fees	[2],[3]	4.03%		3.91%	5.62%
Total return before incentive fees		(29.71%)		2.70%	(10.41%)
Total return after incentive fees		(29.71%)		2.70%	(10.79%)
Frontier Balanced Fund [Member] | Class 3a [Member]
Net asset value	[1]	$ 160.5		$ 156.26	$ 175.18
Net operating results:
Interest income	[1]	0.05		0.28	0.16
Expenses	[1]	(4.87)		(6.12)	(6.87)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(42.87)		10.08	(12.21)
Net income/(loss)	[1]	(47.69)		4.24	(18.92)
Net asset value	[1]	$ 112.81		$ 160.5	$ 156.26
Ratios to average net assets
Net investment income/(loss)		(3.99%)		(3.73%)	(5.48%)
Expenses before incentive fees	[2],[3]	4.03%		3.91%	5.23%
Expenses after incentive fees	[2],[3]	4.03%		3.91%	5.62%
Total return before incentive fees		(29.71%)		2.71%	(10.42%)
Total return after incentive fees		(29.71%)		2.71%	(10.80%)
Frontier Balanced Fund [Member] | Class 1AP [Member]
Net asset value	[1]	$ 137.81		$ 134.16	$ 150.56
Net operating results:
Interest income	[1]	0.04		0.24	0.14
Expenses	[1]	(4.17)		(5.25)	(5.90)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(36.87)		8.66	(10.64)
Net income/(loss)	[1]	(41)		3.65	(16.40)
Net asset value	[1]	$ 96.81		$ 137.81	$ 134.16
Ratios to average net assets
Net investment income/(loss)		(3.99%)		(3.73%)	(5.48%)
Expenses before incentive fees	[2],[3]	4.03%		3.91%	5.23%
Expenses after incentive fees	[2],[3]	4.03%		3.91%	5.62%
Total return before incentive fees		(29.75%)		2.72%	(10.51%)
Total return after incentive fees		(29.75%)		2.72%	(10.89%)
Frontier Select Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 66.56		$ 71.41	$ 90.27
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(3.40)		(3.93)	(4.19)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(4.60)		(0.93)	(14.67)
Net income/(loss)	[1]	(8.01)		(4.86)	(18.86)
Net asset value	[1]	$ 58.55		$ 66.56	$ 71.41
Ratios to average net assets
Net investment income/(loss)		(5.49%)		(5.42%)	(7.38%)
Expenses before incentive fees	[2],[3]	5.49%		5.42%	7.38%
Expenses after incentive fees	[2],[3]	5.49%		5.42%	7.38%
Total return before incentive fees		(12.03%)		(6.80%)	(20.89%)
Total return after incentive fees		(12.03%)		(6.80%)	(20.89%)
Frontier Select Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 103.94		$ 108.18	$ 132.73
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(2.42)		(2.69)	(2.94)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(7.32)		(1.55)	(21.61)
Net income/(loss)	[1]	(9.74)		(4.24)	(24.55)
Net asset value	[1]	$ 94.2		$ 103.94	$ 108.18
Ratios to average net assets
Net investment income/(loss)		(2.49%)		(2.42%)	(3.37%)
Expenses before incentive fees	[2],[3]	2.49%		2.42%	3.37%
Expenses after incentive fees	[2],[3]	2.49%		2.42%	3.37%
Total return before incentive fees		(9.37%)		(3.92%)	(18.50%)
Total return after incentive fees		(9.37%)		(3.92%)	(18.50%)
Frontier Select Fund [Member] | Class 1AP [Member]
Net asset value	[1]	$ 78.51		$ 82.48	$ 100.02
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(1.82)		(2.09)	(2.15)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(5.70)		(1.88)	(15.39)
Net income/(loss)	[1]	(7.52)		(3.97)	(17.54)
Net asset value	[1]	$ 70.99		$ 78.51	$ 82.48
Ratios to average net assets
Net investment income/(loss)		(2.49%)		(2.42%)	(3.37%)
Expenses before incentive fees	[2],[3]	2.49%		2.42%	3.37%
Expenses after incentive fees	[2],[3]	2.49%		2.42%	3.37%
Total return before incentive fees		(9.58%)		(4.81%)	(17.54%)
Total return after incentive fees		(9.58%)		(4.81%)	(17.54%)
Frontier Global Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 131.52		$ 131.57	$ 159.08
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(9.95)		(11.16)	(14.29)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(10.67)		11.11	(13.22)
Net income/(loss)	[1]	(20.62)		(0.05)	(27.51)
Net asset value	[1]	$ 110.9		$ 131.52	$ 131.57
Ratios to average net assets
Net investment income/(loss)		(8.11%)		(7.99%)	(13.50%)
Expenses before incentive fees	[2],[3]	8.11%		7.99%	13.50%
Expenses after incentive fees	[2],[3]	8.11%		7.99%	13.50%
Total return before incentive fees		(15.68%)		(0.04%)	(17.29%)
Total return after incentive fees		(15.68%)		(0.04%)	(17.29%)
Frontier Global Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 192.82		$ 187.17	$ 216.5
Net operating results:
Interest income	[1]	0		0	0.01
Expenses	[1]	(9.47)		(10.11)	(14.12)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(15.79)		15.76	(15.21)
Net income/(loss)	[1]	(25.26)		5.65	(29.33)
Net asset value	[1]	$ 167.56		$ 192.82	$ 187.17
Ratios to average net assets
Net investment income/(loss)		(5.12%)		(4.99%)	(9.49%)
Expenses before incentive fees	[2],[3]	5.12%		4.99%	9.49%
Expenses after incentive fees	[2],[3]	5.12%		4.99%	9.49%
Total return before incentive fees		(13.10%)		3.02%	(13.55%)
Total return after incentive fees		(13.10%)		3.02%	(13.55%)
Frontier Global Fund [Member] | Class 1AP [Member]
Net asset value	[1]	$ 154.43		$ 149.92	$ 176.44
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(7.59)		(8.15)	(11.05)
Net gain/(loss) on investments, net of non-controlling interests	[1]	(146.84)	[4]	12.66	(15.47)
Net income/(loss)	[1]	(154.43)	[4]	4.51	(26.52)
Net asset value	[1]		[4]	$ 154.43	$ 149.92
Ratios to average net assets
Net investment income/(loss)		(5.12%)		(4.99%)	(9.49%)
Expenses before incentive fees	[2],[3]	5.12%		4.99%	9.49%
Expenses after incentive fees	[2],[3]	5.12%		4.99%	9.49%
Total return before incentive fees		(23.34%)	[4]	3.01%	(15.03%)
Total return after incentive fees		(23.34%)	[4]	3.01%	(15.03%)
Frontier Heritage Fund [Member] | Class 1 [Member]
Net asset value	[1]	$ 97.54		$ 99.83	$ 121.19
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(6.76)		(6.90)	(10.86)
Net gain/(loss) on investments, net of non-controlling interests	[1]	5.33		4.61	(10.50)
Net income/(loss)	[1]	(1.44)		(2.29)	(21.36)
Net asset value	[1]	$ 96.1		$ 97.54	$ 99.83
Ratios to average net assets
Net investment income/(loss)		(6.93%)		(6.71%)	(11.85%)
Expenses before incentive fees	[2],[3]	6.93%		6.71%	11.84%
Expenses after incentive fees	[2],[3]	6.93%		6.71%	11.85%
Total return before incentive fees		(1.47%)		(2.30%)	(17.61%)
Total return after incentive fees		(1.47%)		(2.30%)	(17.63%)
Frontier Heritage Fund [Member] | Class 2 [Member]
Net asset value	[1]	$ 153.59		$ 152.53	$ 179.7
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(6.26)		(5.93)	(11.58)
Net gain/(loss) on investments, net of non-controlling interests	[1]	8.58		7	(15.59)
Net income/(loss)	[1]	2.32		1.06	(27.17)
Net asset value	[1]	$ 155.92		$ 153.59	$ 152.53
Ratios to average net assets
Net investment income/(loss)		(3.93%)		(3.70%)	(7.84%)
Expenses before incentive fees	[2],[3]	3.93%		3.70%	7.83%
Expenses after incentive fees	[2],[3]	3.93%		3.70%	7.84%
Total return before incentive fees		1.51%		0.70%	(15.11%)
Total return after incentive fees		1.51%		0.70%	(15.12%)
Frontier Heritage Fund [Member] | Class 1AP [Member]
Net asset value	[1]	$ 114.15		$ 111.78	$ 134.28
Net operating results:
Interest income	[1]	0		0	0
Expenses	[1]	(4.58)		(4.62)	(8.95)
Net gain/(loss) on investments, net of non-controlling interests	[1]	6.93		7	(13.55)
Net income/(loss)	[1]	2.35		2.37	(22.50)
Net asset value	[1]	$ 116.5		$ 114.15	$ 111.78
Ratios to average net assets
Net investment income/(loss)		(3.93%)		(3.70%)	(7.84%)
Expenses before incentive fees	[2],[3]	3.93%		3.70%	7.83%
Expenses after incentive fees	[2],[3]	3.93%		3.70%	7.84%
Total return before incentive fees		2.06%		2.12%	(16.74%)
Total return after incentive fees		2.06%		2.12%	(16.76%)
[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]	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.

Financial Highlights ( Frontier

Financial Highlights ( Frontier Funds) (Details 1) - Frontier Funds [Member]		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net investment income/(loss)	[1]	(5.71%)	(5.54%)	(6.27%)	(5.50%)
Expenses before incentive fees	[2],[3]	(5.75%)	(5.71%)	(6.37%)	4.48%
Expenses after incentive fees	[2],[3]	(5.75%)	(5.71%)	(6.52%)	5.75%
Total return before incentive fees	[4]	(32.58%)	(1.89%)	(16.86%)	3.62%
Total return after incentive fees	[4]	(32.58%)	(1.89%)	(17.01%)	2.35%
[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]	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.
[4]	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 Frontier Funds [Member] - Frontier Balanced Fund [Member] - Number	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Numbers of Instruments Bought	613	1,209	2,183
Derivative Numbers of Instruments Sold	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 Frontier Funds [Member] - Frontier Balanced Fund [Member] - Realized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Realized trading income/(loss)	[1]	$ 598,263	$ 135,527	$ (376,937)
Agriculturals [Member]
Realized trading income/(loss)		147,013	230,294	(20,839)
Currencies [Member]
Realized trading income/(loss)		90,903	(104,140)	(374,202)
Energies [Member]
Realized trading income/(loss)		118,920	124,324	74,850
Interest rates [Member]
Realized trading income/(loss)		59,037	(43,735)	(62,765)
Metals [Member]
Realized trading income/(loss)		217,301	(71,367)	11,010
Stock indices [Member]
Realized trading income/(loss)		$ (34,911)	$ 151	$ (4,991)
[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 Frontier Funds [Member] - Frontier Balanced Fund [Member] - Unrealized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in unrealized trading income/(loss)	[1]	$ 30,465	$ (133,880)	$ 14,335
Agriculturals [Member]
Change in unrealized trading income/(loss)		27,115	(37,494)	(16,846)
Currencies [Member]
Change in unrealized trading income/(loss)		14,158	(127,586)	(124,436)
Energies [Member]
Change in unrealized trading income/(loss)		(25,335)	9,624	(73,724)
Interest rates [Member]
Change in unrealized trading income/(loss)		4,660	(4,922)	207,810
Metals [Member]
Change in unrealized trading income/(loss)		(1,619)	26,498	14,424
Stock indices [Member]
Change in unrealized trading income/(loss)		$ 11,486		$ 7,107
[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 Frontier Funds [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Frontier Balanced Fund [Member] | Open Trade Equity/(Deficit) [Member]
Gross Amounts of recognized Derivative Assets/ Liabilities	$ 814,743	$ 154,778
Gross Amounts offset in the Statements of Financial Condition	(714,303)	(38,594)
Net Amounts Presented in the Statements of Financial Condition	$ 100,440	116,184
Frontier Balanced Fund [Member] | Swap Contracts [Member]
Gross Amounts of recognized Derivative Assets/ Liabilities		11,944,753
Gross Amounts offset in the Statements of Financial Condition
Net Amounts Presented in the Statements of Financial Condition		11,944,753
Frontier Diversified Fund [Member] | Swap Contracts [Member]
Gross Amounts of recognized Derivative Assets/ Liabilities		6,384,583
Gross Amounts offset in the Statements of Financial Condition
Net Amounts Presented in the Statements of Financial Condition		6,384,583
Frontier Long/Short Commodity Fund [Member] | Swap Contracts [Member]
Gross Amounts of recognized Derivative Assets/ Liabilities		362,521
Gross Amounts offset in the Statements of Financial Condition
Net Amounts Presented in the Statements of Financial Condition		362,521
Frontier Heritage Fund [Member] | Swap Contracts [Member]
Gross Amounts of recognized Derivative Assets/ Liabilities		2,888,009
Gross Amounts offset in the Statements of Financial Condition
Net Amounts Presented in the Statements of Financial Condition		$ 2,888,009

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities (The Series of the Frontier Funds) (Details Textual)	12 Months Ended
	Dec. 31, 2020
The Series of Frontier Funds [Member]
Derivative Instruments and Hedging Activities (Textual)
Embedded management fees, description	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.

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities (Frontier Funds) (Details) - Frontier Fund [Member] - Realized Trading Revenue from Futures, Forwards and Options [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Realized trading income/(loss)	$ 598,263	[1]	$ (1,221,224)	$ 681,514
Agriculturals [Member]
Realized trading income/(loss)	147,013		215,822	147,573
Currencies [Member]
Realized trading income/(loss)	90,903		(553,764)	(1,078,570)
Energies [Member]
Realized trading income/(loss)	118,920		(430,890)	1,399,946
Interest rates [Member]
Realized trading income/(loss)	59,037		273,302	54,450
Metals [Member]
Realized trading income/(loss)	217,301		(691,581)	752,938
Stock indices [Member]
Realized trading income/(loss)	$ (34,911)		$ (34,113)	$ (594,823)
[1]	Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.

Derivative Instruments and He_9

Derivative Instruments and Hedging Activities (Frontier Funds) (Details 1) - Frontier Fund [Member] - Net Change in Open Trade Equity from Futures, Forwards and Options [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Unrealized trading income/(loss)	$ 30,465	[1]	$ 568,784	$ (2,144,664)
Agriculturals [Member]
Unrealized trading income/(loss)	27,115		(92,782)	(83,504)
Currencies [Member]
Unrealized trading income/(loss)	14,158		100,545	(682,646)
Energies [Member]
Unrealized trading income/(loss)	(25,335)		221,904	(642,839)
Interest rates [Member]
Unrealized trading income/(loss)	4,660		(231,584)	494,997
Metals [Member]
Unrealized trading income/(loss)	(1,619)		516,390	(1,035,591)
Stock indices [Member]
Unrealized trading income/(loss)	$ 11,486		$ 54,311	$ (195,081)
[1]	Amounts recorded in the Statements of Operations under Net realized gain(loss) on futures forwards and options.

Derivative Instruments and H_10

Derivative Instruments and Hedging Activities (Frontier Funds) (Details 2) - Frontier Fund [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Open Trade Equity/(Deficit) [Member]
Gross Amounts of recognized Derivative Assets/Liabilities	$ 814,743	$ 154,778
Gross Amounts offset in the Statements of Financial Condition	(714,303)	(38,594)
Net Amounts Presented in the Statements of Financial Condition	$ 100,440	116,184
Swap [Member]
Gross Amounts of recognized Derivative Assets/Liabilities		21,579,866
Gross Amounts offset in the Statements of Financial Condition
Net Amounts Presented in the Statements of Financial Condition		$ 21,579,866

Derivative Instruments and H_11

Derivative Instruments and Hedging Activities (Frontier Funds) (Details Textual) - Frontier Fund [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities (Frontier Funds) (Textual)
Monthly average of forwards, options and futures contracts bought	$ 613	$ 1,321	$ 2,684
Monthly average of forwards, options and futures contracts sold	$ 612	$ 1,515	$ 2,482
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	15.00%
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)	12 Months Ended
	Dec. 31, 2020
The Series of 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)	12 Months Ended
	Dec. 31, 2020
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) - The Series of Frontier Funds [Member] - Subsequent Event [Member]	2 Months Ended
	Mar. 10, 2021USD ($)
Frontier Balanced Fund [Member]
Subsequent Events (The Series of the Frontier Funds) (Textual)
Trust paid in redemptions	$ 1,011,147
Frontier Diversified Fund [Member]
Subsequent Events (The Series of the Frontier Funds) (Textual)
Trust paid in redemptions	216,823
Frontier Heritage Fund [Member]
Subsequent Events (The Series of the Frontier Funds) (Textual)
Trust paid in redemptions	97,272
Frontier Long/Short Commodity Fund [Member]
Subsequent Events (The Series of the Frontier Funds) (Textual)
Trust paid in redemptions	41,767
Frontier Masters Fund [Member]
Subsequent Events (The Series of the Frontier Funds) (Textual)
Trust paid in redemptions	43,942
Frontier Select Fund [Member]
Subsequent Events (The Series of the Frontier Funds) (Textual)
Trust paid in redemptions	$ 110,485

Subsequent Events (Frontier Fun

Subsequent Events (Frontier Funds) (Details)	2 Months Ended
	Mar. 10, 2021USD ($)
Frontier Funds [Member] | The Trust [Member] | Subsequent Event [Member]
Subsequent Events (Frontier Funds) (Textual)
Trust paid in redemptions	$ 1,521,437