v3.25.2
Document And Entity Information - shares
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Document Information [Line Items]    
Entity Central Index Key 0001935418  
Entity Registrant Name Foremost Clean Energy Ltd.  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2025  
Document Type 20-F  
Document Registration Statement false  
Document Annual Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Document Shell Company Report false  
Entity File Number 001-41769  
Entity Incorporation, State or Country Code A1  
Entity Address, Address Line One 750 West Pender Street, Suite 250  
Entity Address, City or Town Vancouver  
Entity Address, State or Province BC  
Entity Address, Postal Zip Code V7Y 1K3  
Entity Address, Country CA  
Title of 12(b) Security Common Shares, no par value  
Trading Symbol FMST  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   10,419,966
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction [Flag] false  
Document Accounting Standard International Financial Reporting Standards  
Entity Shell Company false  
Auditor Firm ID 731  
Auditor Name DAVIDSON & COMPANY LLP  
Auditor Location Vancouver, Canada  
Business Contact [Member]    
Document Information [Line Items]    
Entity Address, Address Line One 750 West Pender Street, Suite 250  
Entity Address, City or Town Vancouver  
Entity Address, State or Province BC  
Entity Address, Postal Zip Code V7Y 1K3  
Entity Address, Country CA  
Contact Personnel Name Jason Barnard  
City Area Code 604  
Local Phone Number 330-8067