What you need to register a trailer in Colorado

Colorado requires you to register any trailer you tow on public roads, whether it's a utility trailer, boat trailer, horse trailer, or RV. The Colorado Department of Revenue handles trailer registration through the same system as vehicle registration. You'll need proof of ownership, proof of Colorado residency, and payment of the registration fee, which varies by the trailer's dry weight.

The process differs slightly depending on whether your trailer is new, used, or being transferred from another state. If you're buying from a Colorado dealer, they often handle the paperwork. If you're buying privately or moving to Colorado with a trailer already registered elsewhere, you'll file the process yourself through the county clerk's office or online through the Colorado Department of Revenue website.

Key Takeaways

  • Colorado registration fees for trailers are based on dry weight, not the trailer's value, and range from around $20 to $100 depending on size.
  • You must register a trailer before towing it on public roads; using an unregistered trailer can result in a traffic citation and fine.
  • The county clerk's office in your county processes trailer registration, or you can file online through the Colorado Department of Revenue.
  • You'll need the title, proof of residency, and a completed process for Registration form (DR 14) to register a trailer in Colorado.
  • Trailer registration is valid for two years in Colorado, and you renew it through the same county clerk's office or online system.

Documents you need to bring or submit

Start with the title or proof of ownership. If you bought the trailer in Colorado from a dealer, they should provide a title or a manufacturer's statement of origin. If you bought it privately, the seller must sign the title over to you. If the trailer came from out of state, you'll need the title from that state, and Colorado will issue you a new one during registration.

Next, bring proof of Colorado residency. A utility bill, lease agreement, or mortgage statement dated within the last 60 days works. Your driver's license alone is not enough. You'll also need to complete the process for Registration (Form DR 14), which you can read from the Colorado Department of Revenue website or pick up at your county clerk's office. The form asks for your name, address, the trailer's description, and its dry weight.

If the trailer is new and has never been registered anywhere, bring the manufacturer's statement of origin instead of a title. If you're registering a trailer that was previously registered in another state, bring that state's title or registration document. Colorado will use it to issue a Colorado title.

How to find your trailer's dry weight

The registration fee depends on your trailer's dry weight—what it weighs empty, without cargo or passengers. This is not the same as the gross vehicle weight rating (GVWR), which is the maximum safe weight when loaded. You need the actual dry weight.

Check the trailer's manufacturer's label, usually found on the frame or inside a cabinet. It will list the dry weight clearly. If you can't find the label, contact the manufacturer with the trailer's model number and year. You can also have the trailer weighed at a truck scale—many are located at truck stops and quarries and charge $10 to $20 for a single weighing.

Do not guess or use the GVWR. Colorado's county clerks verify weights against manufacturer data, and if your stated weight is significantly off, you may be asked to provide documentation or have the trailer reweighed before registration is processed.

Registration fees and payment

Colorado's trailer registration fee is based on dry weight in 500-pound increments. A trailer under 500 pounds costs around $20. A trailer between 500 and 1,000 pounds costs around $30. The fee increases by roughly $10 for each additional 500-pound bracket, reaching around $100 for trailers over 3,500 pounds. These amounts can shift slightly year to year, so confirm the exact fee with your county clerk or the Colorado Department of Revenue website before you go in.

You also pay a one-time title fee if you're registering a trailer in Colorado for the first time or transferring a title from another state. This is typically $10 to $15. Some county clerks accept cash, check, or card; others accept only certain payment methods, so call ahead or check the county website.

Registration is valid for two years. When you renew, you'll pay the same weight-based fee again. If your trailer's dry weight changes—for example, if you add a permanent structure—you may need to update the weight and pay a different fee at renewal.

Where to register your trailer

You register your trailer at your county clerk's office. Every county in Colorado has one, and most are open Monday through Friday during business hours. You can find your county clerk's contact information and hours on the Colorado Secretary of State website by searching for your county name.

Alternatively, you can register online through the Colorado Department of Revenue's online registration system if you have a Colorado title or a title from another state. You'll upload images of the title and proof of residency, pay the fee by card, and receive your registration by mail. Online registration typically takes 5 to 10 business days.

If you're registering a trailer you just bought from a Colorado dealer, ask the dealer whether they'll handle the registration for you. Many do as part of the sale, though they may charge a small processing fee. If you're buying privately or from out of state, you must register it yourself.

What happens if you tow an unregistered trailer

Towing an unregistered trailer on a public road in Colorado is a traffic violation. A law enforcement officer can stop you and issue a citation, which typically results in a fine of $65 to $130 depending on the county and whether it's your first offense. The officer may also impound the trailer until it's registered.

Beyond the fine, an unregistered trailer creates a liability problem if you're in an accident. Your vehicle insurance may not cover damage or injury if the trailer wasn't legally registered. If the trailer is involved in a hit-and-run or causes property damage, you could face additional civil liability without the protection of a registered vehicle record.

Registration is inexpensive and takes less than an hour, so it's worth doing before you tow. If you're waiting for a title from a private seller or a dealer, ask your county clerk about a temporary permit or registration pending receipt of the title.

Renewing your trailer registration

Trailer registration in Colorado is valid for two years. You'll receive a renewal notice by mail about 30 days before your registration expires. The notice will show the fee amount based on your trailer's weight and include a form you can mail back with payment, or instructions for renewing online.

You can renew online, by mail, or in person at your county clerk's office. If you renew online, you'll pay by card and receive your new registration within 5 to 10 business days. If you renew by mail, send the notice and payment to the address listed on the form. If you renew in person, bring the notice and payment to the county clerk.

If your registration expires before you renew, you cannot legally tow the trailer. If you miss the renewal important date, you may have to re-register rather than renew, which could involve providing the title again and paying a title fee in addition to the registration fee. Renewing on time is simpler and cheaper.

Frequently Asked Questions

Do I need to register a trailer I only use on private property?

No. Colorado only requires registration for trailers towed on public roads. If you use the trailer only on your own land or on private property with the owner's permission, registration is not required. However, if you ever tow it on a public road—even to move it to another property—you must have it registered.

Can I register a trailer without a title?

It depends. If the trailer is new and has never been registered, you can use the manufacturer's statement of origin instead. If the trailer is used and you've lost the title, contact the Colorado Department of Revenue about obtaining a duplicate or a bonded title. A bonded title requires you to post a bond equal to the trailer's value and wait a set period before Colorado issues a permanent title. This process takes several weeks.

What if I buy a trailer out of state and move to Colorado?

Bring the out-of-state title and proof of Colorado residency to your county clerk's office. Colorado will issue you a new Colorado title and registration. You pay the registration fee based on the trailer's dry weight, plus a title fee. The process is the same as registering a used trailer bought in Colorado.

Does my vehicle insurance cover a towed trailer?

Most auto insurance policies cover a trailer you're towing, but coverage limits and conditions vary. Check your policy or call your insurer before you tow. Some policies require you to add the trailer to your coverage, and some exclude certain types of trailers. Having the trailer registered makes it easier for your insurer to verify ownership and process claims.

What if my trailer's dry weight is borderline between two fee brackets?

Colorado rounds up. If your trailer weighs 501 pounds, it falls into the 500–1,000 pound bracket and you pay that fee. If it weighs exactly 500 pounds, it's in the under-500 bracket. Bring documentation of the exact weight from the manufacturer's label or a truck scale to avoid disputes.