Colorado Pet Travel Rules for RVers

Required Travel Documents

Colorado does not require a Certificate of Veterinary Inspection (CVI) for pet dogs and cats entering from other U.S. states. For livestock, horses, or commercial animal shipments, a CVI and brand inspection are required by the Colorado Department of Agriculture.

Most campgrounds and state parks in Colorado do not require a CVI at check-in, but proof of current rabies vaccination is commonly required. Keep digital and paper copies handy.

If you are traveling with a therapy or service animal, Colorado follows federal ADA guidelines — no documentation is legally required, but individual businesses may ask the two permitted ADA questions.

Vaccination Requirements

Rabies vaccination is required by Colorado state law for dogs. Many counties also require it for cats. Tularemia (rabbit fever) is present in Colorado rodent populations; while there's no travel requirement, it's worth knowing your dog could be exposed in prairie dog areas.

Plague (Yersinia pestis) is an active concern in Colorado prairie dog and squirrel populations. There is no vaccine for dogs, but keeping your pet from rooting around prairie dog burrows significantly reduces risk.

RV and Vehicle Rules

Colorado's maximum single-unit RV length is 45 feet, and the combined length for a tow/trailer combination is 70 feet — quite generous compared to many states.

Mountain passes are the key challenge. Independence Pass (SR-82) is closed to vehicles over 35 feet and prohibits trailers. Trail Ridge Road in Rocky Mountain National Park recommends vehicles no longer than 35 feet. Narrow canyon roads (Million Dollar Highway, US-550) are passable for most rigs but require skill and attention.

Colorado law prohibits transporting dogs in an unsecured manner in an open truck bed on a public road. Colorado Revised Statutes §18-9-202 covers animal cruelty and can apply to dangerous vehicle transport.

Winter travel: Colorado mountain passes frequently close for snow. CDOT's 511 system and cotrip.org provide real-time road conditions. Snow chains or traction devices may be required (CO-chain law) — verify for your route before departing.

State Park and Campground Pet Policies

Colorado State Parks allow leashed pets (6-foot maximum) in most campgrounds and day-use areas. Pets are prohibited in swim beaches, park buildings, and many designated wildlife areas.

Colorado has excellent dog-friendly trail access compared to other states. Rocky Mountain National Park allows dogs on two trails (Sprague Lake and the paved paths), but most backcountry trails are off-limits.

National Forest land in Colorado is more permissive — dogs are generally allowed on NFS trails, though some designated wilderness areas require dogs to be on a leash. Check with the specific ranger district.

Most Colorado State Park campgrounds charge a $10 vehicle entry fee plus a $10 per-night camping fee; pet fees vary by park, typically $2–$4 per night.

Breed Restrictions and Quarantine Notes

Colorado has no statewide breed-specific legislation. However, several Colorado municipalities have had pit bull bans; some have been repealed in recent years (Denver repealed its ban in 2020). Check local ordinances for your specific stops.

No quarantine is required for domestic dogs and cats entering Colorado from other U.S. states.

Disclaimer: Verify with Colorado Department of Agriculture (colorado.gov/ag) and Colorado Parks and Wildlife before your trip.

Frequently Asked Questions

Does Colorado require a health certificate for dogs?

No CVI required for pet dogs and cats from other U.S. states. Livestock and horses require a CVI and brand inspection.

Can dogs hike in Rocky Mountain National Park?

Dogs are allowed on only two trails: Sprague Lake and the paved paths. All other backcountry trails are off-limits for pets.

What are the RV size limits on Colorado mountain passes?

Independence Pass (SR-82) is closed to vehicles over 35 feet. Trail Ridge Road recommends a 35-foot maximum. The statewide single-unit limit is 45 feet.

Is plague a real risk for dogs in Colorado?

Yes. Yersinia pestis is present in prairie dog and squirrel colonies throughout Colorado. Keep dogs away from burrowing rodent areas.