Emissions Testing Requirements
Vehicle exhaust pipes and clean air

Motor Vehicle, Elections, & Recording are open Monday -Thursday 7:30 a.m. – 5 p.m. and closed to the public on Friday. See press release for more details. Las divisiones de Vehículos de Motor, Elecciones y Registro están abiertas de Lunes a Jueves de 7:30am a 5:00pm, y cerradas al público los Viernes. Vea el Comunicado de Prensa para más detalles.

Emissions Requirements

When the vehicle is 7-years-old, vehicles must pass an emissions inspection in order to be registered in Boulder County. Testing is required when a vehicle changes ownership in their 7th model year or later (even if there is time left on the previous test, 2015 vehicles in 2021) and for registration renewal, if indicated on the renewal notice. Please consult Gas and Diesel Emissions pages links to the right.

The following vehicle types do not require emissions testing:

  • Motorcycles
  • All-electric vehicles
  • Gas-fueled or hybrid vehicles within the first seven model years
  • Diesel-fueled vehicles with GVWR under 26,000 pounds are exempt for the first four model years
  • Diesel-fueled vehicles with GVWR 26,000 pounds or more are exempt for the first six model years
  • Vehicles 1975 and older with collector plates
  • Kit cars
  • Horseless carriages
  • Vehicles registered as farm trucks
  • Vehicles registered as street rods

Testing requirements, locations, and exemptions for gas, hybrid, and alternative-fuel vehicles

Learn More

Testing requirements, locations, and exemptions for diesel vehicles

Learn More

There are three situations where emissions requirements may temporarily be extended or waived:

  1. Emissions Extension – for vehicles that are temporarily located out-of-state
  2. Hardship Waiver – for vehicles that have recently failed an emissions test and the owner is unable to obtain necessary repairs due to a financial hardship
  3. Repair Waiver – for vehicles that have failed an emissions test after undergoing emissions-related repairs

Out-of-State Emissions ExtensionFinancial Hardship/Repair Waiver

Contact Us

Motor Vehicle Division

**New as of Jan 4, 2021**
7:30 a.m. – 5:00 p.m. Mon-Thurs.
CLOSED Fridays
Online Contact Form
Contáctenos - Formulario en línea

Phone: 303-413-7710

Fax: 303-413-7725 (Boulder office)
Fax: 303-413-7002 (Lafayette office)
Fax: 303-678-6126 (Longmont office)


Boulder: 1750 33rd Street
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Longmont: 529 Coffman Street
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Lafayette: 1376 Miners Drive
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Mailing Address

1750 33rd Street, Suite 100
Boulder, CO 80301