← Montana alcohol laws›DUI / DWI Limits

Montana DUI / DWI Limits (2026)

Info: Adult DUI threshold 0.08% BAC (aggravated at 0.16%).

InfoVerified May 31, 2026

Adult DUI threshold 0.08% BAC (aggravated at 0.16%). Under 21: zero-tolerance 0.02% BAC.

Official source: dojmt.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

Don't get caught off guardGet a push the moment Montana law changes — or when you cross into a state where it's different. Free.Get the free app
LawLert is an independent app, not affiliated with any government — informational only, not legal advice. Verify with a licensed attorney in your jurisdiction.