Diesel Vehicles

Which counties require a passing emissions test to register a vehicle?

• Boulder
• Jefferson
• Broomfield
• Denver
• Douglas
• Portions of Adams
• Portions of Arapahoe
• Portions of Larimer
• Portions of Weld
• Portions of El Paso

See our map for testing locations and diesel emissions area boundaries. For hours of operation, please contact the diesel testing station., If you are unsure if a diesel test is required in your area, please contact your local county motor vehicle office.

 

The 2021 emissions requirements for a diesel vehicle

 

2021 Diesel Emissions Requirement
(GVWR up to 26000 lbs.)
Model Year	Heavy-Duty Diesel	Frequency of Test	Testing Fee
2021	Exempt	n/a	n/a
2020	Exempt	n/a	n/a
2019	Exempt	n/a	n/a
2018	Renewal are Exempt	n/a	n/a
	Need test if transfer of ownership	n/a	Rates vary per diesel testing center
2017	Need test	Every two years	Rates vary per diesel testing center
2016	Need test	Every two years	Rates vary per diesel testing center
2015	Need test	Every two years	Rates vary per diesel testing center
2014	Need test	Every two years	Rates vary per diesel testing center
2013	Need test	Every two years	Rates vary per diesel testing center
1988 – 2012*	Need test	Annually	Rates vary per diesel testing center
1976 - 1988 With Collector Plates	Need test	Every five years	Rates vary per diesel testing center
1976 - 1988 Without Collector Plates	Need test	Annually	Rates vary per diesel testing center
1976 or newer Grandfathered**	Exempt	n/a	n/a
1975 and older With Collector Plates	Exempt	n/a	n/a
1975 and older without Collector Plates	Need test	Annually	Rates vary per diesel testing center
*2008 Transition from biennial to annual testing is based on the MSO (Manufacturer Statement of Origin) date of the vehicle. See local County DMV for more information. ** Vehicles model year 1976 or newer that have been registered as a "collector's item" prior to September 1, 2009, and the registration has never lapsed or expired or had a change of ownership.

 

2021 Diesel Emissions Requirements
(GVWR 26000 lbs. or more)
Model Year	Heavy-Duty Diesel	Frequency of Test	Testing Fee
2021	Exempt	n/a	n/a
2020	Exempt	n/a	n/a
2019	Exempt	n/a	n/a
2018	Exempt	n/a	n/a
2017	Exempt	n/a	n/a
2016	Renewal are Exempt	n/a	n/a
	Need test if transfer of ownership	Every two years	Rates vary per diesel testing center
2015	Need test	Every  two years	Rates vary per diesel testing center
2014	Need test	Every two years	Rates vary per diesel testing center
2013*	Need Test	Every two years	Rates vary per diesel testing center
1988 - 2012	Need Test	Annually	Rates vary per diesel testing center
1976 – 1988 With Collector Plates	Need Test	Every five years	Rates vary per diesel testing center
1976 - 1988 Without Collector Plates	Need test	Annually	Rates vary per diesel testing center
1976 or newer Grandfathered**	Exempt	n/a	n/a
1975 and older With Collector Plates	Exempt	n/a	n/a
1975 and older without Collector Plates	Need test	Annually	Rates vary per diesel testing center
*Transition from biennial to annual testing is based on the MSO (Manufacturer Statement of Origin) date of the vehicle. See local County DMV for more information. ** Vehicles model year 1976 or newer that have been registered as a "collector's item" prior to September 1, 2009, and the registration has never lapsed or expired or had a change of ownership.

 

Can I register my diesel vehicle online?

Yes. Effective June 1, 2017 all diesel vehicles that do require a passing emission test (Boulder, Jefferson, Broomfield, Denver and Douglas Counties, and portions of Adams, Arapahoe, Larimer, Weld and El Paso counties) are eligible for online renewal.

Locations

Diesel emission testing facilities charge up to one-hour of the posted labor rates, so fees will vary. Contact the specific station for fees.

View a map of testing locations and diesel area boundary

 

Please click here for a list of Licensed Diesel Emissions Testing Stations