Document and Entity Information	Total
Prospectus:
Document Type	485BPOS
Document Period End Date	Jun. 30, 2021
Registrant Name	FRONTIER FUNDS, INC
Entity Central Index Key	0001014913
Entity Inv Company Type	N-1A
Amendment Flag	false
Document Creation Date	Oct. 28, 2021
Document Effective Date	Oct. 31, 2021
Prospectus Date	Oct. 31, 2021
Frontier MFG Global Equity Fund \| Institutional Class
Prospectus:
Trading Symbol	FMGEX
Frontier MFG Global Equity Fund \| Service Class
Prospectus:
Trading Symbol	FMGSX
Frontier MFG Global Plus Fund \| Institutional Class
Prospectus:
Trading Symbol	FMGPX
Frontier MFG Global Plus Fund \| Class Y
Prospectus:
Trading Symbol	FMGYX
Frontier MFG Global Plus Fund \| Service Class
Prospectus:
Trading Symbol	FMPSX
Frontier MFG Global Sustainable Fund \| Institutional Class Shares
Prospectus:
Trading Symbol	FMSGX
Frontier MFG Global Sustainable Fund \| Service Class Shares
Prospectus:
Trading Symbol	FMSRX
Frontier MFG Core Infrastructure Fund \| Institutional Class
Prospectus:
Trading Symbol	FMGIX
Frontier MFG Core Infrastructure Fund \| Service Class
Prospectus:
Trading Symbol	FCIVX
Frontier MFG Select Infrastructure Fund \| Institutional Class Shares
Prospectus:
Trading Symbol	FMSIX
Frontier MFG Select Infrastructure Fund \| Service Class Shares
Prospectus:
Trading Symbol	FMSSX
Frontier HyperiUS Global Equity Fund \| Institutional Class Shares
Prospectus:
Trading Symbol	FHYPX
Frontier HyperiUS Global Equity Fund \| Service Class Shares
Prospectus:
Trading Symbol	FHGSX

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