Diesel Vehicles

Diesel Emissions Program

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.