Colorado · DUI · Checked October 2026
Ignition Interlock Rules in Colorado
Ignition Interlock Rules in Colorado: What Are the Rules?
When Colorado requires an ignition interlock after a DUI.
- First offense
- 9 months for a first offense with BAC below 0.15 (runs concurrently with the 9-month revocation); 2 years with BAC 0.15 or higher
- Repeat offenses
- 2 years for a second or later per se violation and for any test refusal
First Offense in Colorado
9 months for a first offense with BAC below 0.15 (runs concurrently with the 9-month revocation); 2 years with BAC 0.15 or higher
Repeat Offenses in Colorado
2 years for a second or later per se violation and for any test refusal
How the Program Works in Colorado
The device must be serviced every 60 days. Driving a vehicle without an interlock or tampering brings at least a 1-year revocation with no driving. Three failed starts in any 12 consecutive months can add up to 1 year of interlock time.
More on DUI Law in Colorado
See the full overview of DUI laws in Colorado and read about how ignition interlock programs work.
This page summarizes Colorado law from official sources, checked October 2026. It isn't legal advice; a lawyer licensed in Colorado can advise on your case.
Frequently Asked Questions
Is an Ignition Interlock Required for a First DUI in Colorado?
9 months for a first offense with BAC below 0.15 (runs concurrently with the 9-month revocation); 2 years with BAC 0.15 or higher
Is an Interlock Required for Repeat Offenses?
2 years for a second or later per se violation and for any test refusal