Colorado vehicle registration renews every year or two, depending on your vehicle type, and you can renew online, by mail, or in person at your county clerk's office

Colorado issues registration decals that expire on the last day of your birth month (for most passenger vehicles) or on a set schedule for commercial and other vehicle types. You'll receive a renewal notice in the mail about 30 days before expiration. The fastest route is online through the Colorado Department of Revenue's website, which takes about 10 minutes and costs the standard renewal fee plus any applicable taxes. If you prefer not to use the website, you can mail your renewal notice with payment to your county clerk, or walk in during business hours.

The key requirement is that your vehicle must pass Colorado's emissions test before you can renew, unless it's exempt. Emissions testing is required every two years for most vehicles registered in the Denver metro area, the Front Range, and certain other counties; vehicles in rural counties may not need it. You'll need proof that your vehicle passed the test when you renew, or you can renew first and then test within 60 days in some cases—but the rules vary by county, so check with your county clerk before assuming you can test after renewal.

Key Takeaways

  • Colorado registration renews on the last day of your birth month for most passenger vehicles, and you can renew online, by mail, or in person at your county clerk's office.
  • You must pass an emissions test before renewing in most Colorado counties, and the test is valid for two years from the date you pass it.
  • The renewal notice arrives about 30 days before expiration and includes the fee amount, which varies based on vehicle type and county.
  • Online renewal through the Colorado Department of Revenue website is the fastest option and requires only your renewal notice number and payment method.
  • If your registration has already expired, you can still renew, but you may face a late fee and will need to provide proof of insurance current as of the expiration date.

What you need to renew online

To renew through the Colorado Department of Revenue website, you'll need your renewal notice (the form mailed to you), your vehicle identification number (VIN), and a valid payment method—credit card, debit card, or electronic check. The renewal notice includes a reference number that speeds up the process. If you've lost the notice, you can still renew online by entering your VIN and driver's license number instead, though it takes a few extra steps.

You'll also need proof that your vehicle passed the emissions test, if required in your county. Have that certificate number or test date ready before you start. If you haven't tested yet, you can complete the renewal and then schedule your emissions test within the allowed window for your county—but confirm with your county clerk first, because some counties require the test before renewal and others allow it after.

Renewing by mail or in person

If you prefer to renew by mail, sign the renewal notice, include your payment (check or money order), and mail it to your county clerk's office. The address is on the notice itself. Mail renewal typically takes 7 to 10 business days after the clerk receives it, so send it at least two weeks before expiration if you want the new decal before your current one expires. Include a copy of your emissions test certificate if required.

To renew in person, bring your renewal notice, proof of insurance, and payment (cash, check, or card, depending on the county) to your county clerk's office during business hours. You can find your county clerk's location and hours on the Colorado Secretary of State website. In-person renewal is usually processed the same day, and you'll leave with your new decal. This is the best option if your registration has already expired or if you need the decal when ready.

Emissions testing requirements and exemptions

Colorado requires emissions testing in the Denver metro area (Denver, Boulder, Adams, Arapahoe, Douglas, Jefferson, and Broomfield counties), the Front Range (El Paso and Pueblo counties), and a few other areas. Testing is required every two years for most gasoline-powered vehicles. Diesel vehicles, motorcycles, and vehicles older than 1975 are exempt. New vehicles (current model year) are exempt for the first four years of registration.

You can get your vehicle tested at any Colorado emissions testing station, and the test costs around $25 to $30, though prices vary by station. The test is valid for two years from the date you pass it. If you're renewing in a county that doesn't require emissions testing, you can skip this step entirely. Check your renewal notice or call your county clerk to confirm whether testing is required for your vehicle.

Late renewal and expired registration

If your registration has expired, you can still renew, but you'll owe a late fee in addition to the standard renewal fee. The late fee is typically $10 to $25, depending on how long the registration has been expired. You'll also need to provide proof of insurance that was current on the date your registration expired—not current insurance, but insurance that was in force when the registration lapsed. This is a common stumbling block, so gather that documentation before you renew.

If you were driving with an expired registration, you may have received a citation. Renewing your registration does not clear a traffic ticket, but it does bring your vehicle into legal status. If you're unsure whether you have an outstanding citation, contact your county court or the police department that issued the ticket before renewing.

Registration fees and what affects the cost

Colorado registration fees vary based on vehicle type, vehicle weight, county of registration, and whether you're renewing a standard passenger vehicle or a commercial vehicle. A typical passenger vehicle renewal costs between $100 and $200, but this is not a fixed amount. Your renewal notice will show the exact fee for your vehicle. Some counties add local fees on top of the state fee, so the total can be higher in some areas than others.

If you're renewing a vehicle you recently purchased, the fee may be prorated based on when you registered it. If you're renewing a vehicle you've owned for years, the fee is usually the same each year unless the vehicle's assessed value has changed. Electric vehicles and hybrid vehicles may may have access to for a reduced registration fee in Colorado, though the discount varies. Check your renewal notice or contact your county clerk to see if your vehicle qualifies.

What to do if you move or change your address

If you've moved to a different Colorado county since your last registration, you'll need to re-register your vehicle in your new county rather than straightforward renewing. This is a new registration, not a renewal, and it costs more than a renewal fee. You'll need your current title, proof of insurance, and proof of residency in the new county. Contact your new county clerk's office for the exact documents required and the fee amount.

If you've moved within the same county, you can renew normally, but update your address with the Colorado Department of Revenue at the same time. You can do this online, by mail, or in person. If you move out of Colorado, you'll need to cancel your Colorado registration and register your vehicle in your new state.

Frequently Asked Questions

Can I renew my registration if my vehicle hasn't passed emissions testing?

In most Colorado counties, no—you must pass the emissions test before renewing. However, some counties allow you to renew first and then test within 60 days. Call your county clerk to confirm the order for your specific county before you start the renewal process.

What happens if I drive with an expired registration?

You can be cited for expired registration, which carries a fine. Renewing your registration does not clear the citation, but it does bring your vehicle into legal status going forward. If you've been cited, contact the court or police department that issued the ticket to resolve it separately.

How long does online renewal take?

The online renewal process itself takes about 10 minutes. Your new registration is usually processed within one business day, and your decal arrives by mail within 7 to 10 days. If you need the decal faster, renew in person at your county clerk's office.

Do I need to renew my registration every year?

Most passenger vehicles renew every year on the last day of your birth month. Some vehicle types, like commercial vehicles or trailers, may have different renewal schedules. Your renewal notice will show your specific expiration date.

What if I lost my renewal notice?

You can still renew online by entering your VIN and driver's license number instead of the renewal notice number. You can also call your county clerk's office, and they can mail you a duplicate notice or help you renew over the phone in some cases.