Western Montana draws visitors year-round, from travelers passing through Missoula to people heading for Glacier National Park, Yellowstone country, the rivers or the ski hills. When one of those trips ends in a DUI arrest, the questions are different from a local case. What happens to my license back home? Do I have to come back for court? Does an old conviction from my state count here? This page answers those questions under Montana law. I have worked inside a local prosecutor's office and as a federal law clerk, and I am certified in NHTSA Standardized Field Sobriety Testing.
Montana DUI Law Applies to Everyone Who Drives Here
The Montana DUI statutes apply to a person driving in Montana, wherever that person's license was issued. The same charges are available: impairment DUI under MCA § 61-8-1002(1)(a), the 0.08 per se offense under § 61-8-1002(1)(b), the THC and drug limits, and the under-21 rules. The same penalties apply, and the same deadlines run. Our main Missoula DUI defense page explains how a case moves through the courts, and our first-offense DUI page covers the penalties for a first case.
What Reaches Your Home State and Your Montana Privilege
Two sets of rules matter for a visitor. One is what Montana does to your ability to drive in Montana. The other is what Montana reports to your home state and how your home state treats it.
| Issue | What the law says | MCA section |
|---|---|---|
| Report to your home state | Montana's licensing authority reports a conviction of a driver from another party state to the home state's licensing authority. | § 61-5-401, Art. III |
| Same effect at home | The home state gives a reported DUI conviction the same effect as if it had happened there. | § 61-5-401, Art. IV(1)(b) |
| Montana driving privilege | Your privilege to drive in Montana can be suspended or revoked like a Montana license. | § 61-5-203(1) |
| Driving while suspended here | A suspended driver may not drive in Montana on a license issued by another jurisdiction. | § 61-5-210 |
| Prior convictions | A DUI conviction in another state counts as a prior in Montana. | § 61-8-1011(1)(a) |
The Driver License Compact
Montana enacted the Driver License Compact in 1963, and it is codified at MCA § 61-5-401. Article III requires Montana's licensing authority to report each conviction of a person from another party state to the licensing authority of that person's home state. Article IV(1)(b) then requires the home state to give the reported conduct the same effect it would have if it had happened in the home state, for driving under the influence of intoxicating liquor or a narcotic drug.
In practice, that means a Montana DUI conviction can follow you home and be treated there under your own state's rules. What your home state does with it depends on its law, not Montana's. Not every state is a party to the Compact, and membership is something I confirm for your state rather than assume. If you hold a license from another state, it can help to talk with a lawyer there as well about the home-state consequences.
Your Privilege to Drive in Montana
For a visitor, the Montana consequence falls on the privilege to drive here. Under MCA § 61-5-203(1), a nonresident's driving privilege is subject to suspension or revocation in the same way and for the same causes as a Montana license. Under § 61-5-210, a person whose privilege is suspended may not drive in Montana on a license, permit or registration issued by any other jurisdiction. Driving on a DUI-based suspension is its own offense and can also make a later DUI aggravated. Our license suspension page covers the suspension periods.
The 30-Day Petition Still Applies to Visitors
If you refused a test, or your license was otherwise taken at the stop, a deadline may be running even after you have gone home. Under MCA § 61-8-1017(1), a person may file a petition to challenge the license suspension or revocation within 30 days after the officer gives notice of the right to a hearing. The petition goes to the district court in the county where the arrest was made. For a Missoula County arrest, that is the Fourth Judicial District Court, not the court hearing the DUI itself. The issues at that hearing are narrow, and the court may stay the suspension while the petition is pending. Our test refusal page explains the refusal suspension in detail.
Out-of-State Priors Count in Montana
Under MCA § 61-8-1011(1)(a), a prior DUI conviction counts whether it happened in Montana, in another state or on a federally recognized Indian reservation. For a second offense, a prior counts if less than 10 years passed between that conviction and the new offense. For a third or later offense, all prior convictions count. A conviction from years ago in another state can therefore move a Montana case into a higher penalty tier, and some combinations reach felony DUI. Under MCA § 44-4-1205(4), a court can also require the 24/7 Sobriety Program for a person with a DUI conviction from another state within the 10 years before the current charge. See our second and third DUI page for how the tiers work.
Court Dates When You Live Somewhere Else
A DUI written by Missoula city police generally goes to Missoula Municipal Court. A citation from the Missoula County Sheriff's Office or the Montana Highway Patrol generally goes to Missoula County Justice Court. Felony cases are handled in the Fourth Judicial District Court. Each court sets its own expectations about which hearings you must attend in person. Before each date, I can tell you what the court expects so you can plan travel and time off. Missing a required appearance creates new problems, so never assume a date can be skipped.
Much of the rest of the work can be done from a distance: gathering the reports and video, reviewing the stop and any tests, tracking deadlines and talking through options. Montana does not allow a deferred sentence for DUI (MCA § 61-8-1011(4)), so the choices in these cases need careful thought, especially when a conviction will also be reported home.
This page explains Montana law in general under the 2025 Montana Code Annotated and is not advice on a specific case.