Montana DUI Laws
Montana DUI Defense
What you're facing, what the deadlines are, and the questions your attorney needs to answer, specific to Montana (MT) law.
BAC Limit
0.08
Enhanced BAC
0.16
Higher penalties above this
Lookback Period
10 years
Prior offenses count within
First Offense Penalties in Montana
Implied Consent & Test Refusal
Like all 50 states, Montana has an implied consent law, by driving on Montanaroads, you've already agreed to submit to a chemical test (breath, blood, or urine) if an officer has probable cause to believe you're impaired.
Refusal Penalty
6-month license suspension
Montana-Specific Detail
Montana has no mandatory minimum jail time for a standard first-offense DUI (under 0.16 BAC). The state does require a chemical dependency assessment and completion of a treatment course.
Is your Montana DUI defense on track?
The Masked Researcher’s First Read checks 10 critical defense behaviors specific to DUI cases. Takes 2 minutes. Instant results.
Take the Free Defense ScoreDUI Defense Playbook — $127
26 questions that change how your next attorney meeting goes, a case stage roadmap, red flag checklist, and a case progress scorecard. Instant PDF download — calibrated for Montana DUI defendants.
Other Montana defense topics
Facing a different charge in Montana? Penalty ranges, enhancements, and defense questions for related crimes:
Important: This page provides general legal information about Montana DUI laws as of the date of publication. Laws change frequently. This is not legal advice. For guidance specific to your case, speaking with a Montana-licensed attorney is one option, or take the free Masked Researcher’s First Read to see where your case stands.