First DUI Penalties in Montana (2026)
Complete guide to what happens when you get your first DUI in Montana — jail time, fines, license suspension, and what you can do about it.
Understanding First-Offense DUI in Montana
A first-offense DUI in Montana is classified as a Misdemeanor. While this is the least severe DUI charge, the consequences are still significant and can affect your life for years. Montana uses a 10-year lookback period, meaning any subsequent DUI within that window will be treated as a repeat offense with harsher penalties.
Montana has a 10-year lookback for DUI penalties but uses a lifetime lookback for felony charges (4th offense ever). The BAC (Blood Alcohol Concentration) limit in Montana is 0.08% for standard drivers, 0.04% for commercial drivers, and 0.02% for drivers under 21. Being at or above these limits creates a "per se" DUI charge — the prosecution does not need to prove impairment.
Penalties Breakdown
What Happens After a First DUI Arrest in Montana
After being arrested for a first DUI in Montana, you will face two separate proceedings: a criminal court case and an administrative license suspension through the DMV. Montana has implied consent laws, meaning you automatically consent to chemical testing by driving on state roads. Refusing a test triggers additional penalties.
The criminal case will determine whether you are convicted and what sentence you receive. Meanwhile, the DMV will independently suspend your license. In many cases, you have only 10 to 30 days to request a DMV hearing to challenge the suspension. Missing this deadline means an automatic suspension.
How a DUI Attorney Can Help
An experienced DUI attorney in Montana can challenge the traffic stop, question the accuracy of breath or blood tests, negotiate reduced charges (such as a "wet reckless"), protect your driving privileges, and minimize the long-term impact on your record. Attorney fees for a first DUI typically range from $2,000 to $5,000, but the savings in reduced penalties and protected employment can be far greater.
Unfortunately, Montana does not allow DUI expungement. This makes it even more important to fight the charges or negotiate a reduction with an experienced attorney.
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Official Sources
DUIFinders.com is not a law firm and does not provide legal advice. Information is for general purposes only.
Frequently Asked Questions
What is the penalty for a first DUI in Montana?
A first DUI in Montana is classified as a Misdemeanor. Penalties include Up to 6 months (24 hours mandatory) jail time, $600–$1,000 in fines, and 6-month suspension.
Will I go to jail for a first DUI in Montana?
Yes, Montana has mandatory minimum jail time for first-offense DUI. You face Up to 6 months (24 hours mandatory).
How much does a first DUI cost in Montana?
Court fines alone are $600–$1,000, but total costs including attorney fees, classes, insurance increases, and IID installation typically range from $10,000 to $25,000.
Will I lose my license for a first DUI in Montana?
Yes. A first DUI in Montana results in 6-month suspension. You may be eligible for a restricted license with an ignition interlock device.
Can a first DUI be expunged in Montana?
No, Montana does not currently allow DUI expungement.