Ignition interlock in Montana

Montana's full guide is still being checked against the statute and the state agency. Below is the IIHS rule for Montana, the agency that runs the program and the companies it approves, each linked to its source.

Checked Oct 23, 2026Sources

Neither, by the IIHS definition

First offense, to drive during the post-conviction suspension: no
First offense, as a penalty or to get the license back: no
Repeat offense, as a penalty or to get the license back: no

IIHS, October 2026¹

Each dot is a service location listed by an interlock company. Orange rings mark your search.Company locators, Oct 2026

Who has to install one in Montana

Program run by: Montana DOJ Motor Vehicle Division (MVD)

Law: MCA 61-8-1025 (rules for device approval/installation/removal; formerly 61-8-441); ARM 23.3.955 (MVD Administrator certifies each device before install) · read it

For the rule that applies to you, read your court order or the letter from the DMV.

A judge can order an interlock in other cases too. Your court order or DMV letter is what binds you.

Where each company can install in Montana

You'll go back to the same company's locations for service for the whole order, so check that one is close to where you live and work before you book.