Montana Ignition Interlock DUI Laws

Information on Montana DUI and Ignition Interlock Laws

Montana DUI law requires license suspension for those convicted of driving under the influence (DUI) with a blood alcohol concentration (BAC) of .08 or more or those who refuse to take a BAC test at the time of their arrest.

For a 1st conviction, you’ll receive a six-month suspension. For a 2nd conviction or more within five years, you’ll receive a one-year suspension.

Courts can also order additional treatment sanctions and require the installation of an ignition interlock device.


Every situation and state is unique, please consult with your attorney or your state licensing authority to confirm your requirements and obligations.

The information provided on this website does not, and is not intended to, constitute legal advice; instead, all information, content, and materials available on this site are for general informational purposes only. Information on this website may not constitute the most up-to-date legal or other information. This website contains links to other third-party websites for the convenience of our readers. Links from LifeSafer Ignition Interlock to other sites, or from other sites to the LifeSafer, do not constitute an endorsement by LifeSafer.  

Interlock Process

An ignition interlock probationary license may be available after 45 days through the completion of a chemical dependency education course or treatment.

How do I get an interlock license?

  • After your arrest, you licence will be suspended. Check the status of your license online.

  • You may be eligible for a probationary license with an interlock. In order to qualify after a 1st DUI conviction in Montana, you must surrender your credential to MVD, receive the judge’s recommendation to be eligible for a probationary driver’s license from the convicting judge and you may be court-ordered to install an ignition interlock. Additionally, you’ll pay a $206 reinstatement fee to restore credentials or driving privileges.

  • Call LifeSafer Ignition Interlock at 800-634-3077 to schedule your ignition interlock installation. Ask about discounts and special offers!

Interlock Cost

How much does an interlock cost in Montana?

An ignition interlock (IID) is about $3 per day on average in Montana, but what you are paying for goes beyond the device. LifeSafer IIDs are tested and calibrated for accuracy before ever going out the door.

Our customer service and reporting specialists are also part of LifeSafer’s value to our customers. Your Montana installation center is constantly updating its training and calibration service so your program runs smoothly and we can install an interlock on any vehicle. There is a lot riding on your device working properly and LifeSafer invests in accuracy and ease of use.

LifeSafer Ignition Interlock reviews from Trustpilot

Convenient LifeSafer interlock installers throughout Montana