Colorado follows the ADA definition, gives any trainer access with a dog in training, and exempts service animals from license fees. Misrepresenting a service animal is a petty offense, but only after a prior warning. In housing, Colorado went the other way from HUD: since August 12, 2026 (HB26-1045), an assistance animal, including an ESA, is presumed a reasonable accommodation.
Who counts as a service animal in Colorado?
C.R.S. 24-34-301 says "'Service animal' has the same meaning as set forth in the implementing regulations of Title II and Title III of the federal 'Americans with Disabilities Act of 1990'." A "service-animal-in-training" is "a dog or miniature horse that is being individually trained" (18-13-107.7).
Since HB26-1045 took effect, Colorado's anti-discrimination law also defines an "assistance animal" (one that "does work, performs tasks, assists, or provides therapeutic emotional support", including ESAs and service animals) and an "emotional support animal" (one that "provides solely emotional support to an individual to alleviate a symptom or an effect of a disability"). Those definitions are for housing. In public places an ESA is still not a service animal.
Public places in Colorado, including hotels and restaurants
"A qualified individual with a disability has the right to be accompanied by a service animal individually trained for that individual without being required to pay an extra charge" (C.R.S. 24-34-803(1)). The law lists employment, housing, public accommodation, public programs, public transportation and "Any other place open to the public", so hotels and restaurants are included.
The federal ADA applies in Colorado too. When it is not obvious what the dog does, staff may ask only whether it is a service animal required because of a disability and what task it has been trained to perform. They may not ask for documents or a demonstration. See what businesses can ask about a service dog.
Service dogs in training in Colorado
Yes, broadly. "A trainer of a service animal, or an individual with a disability accompanied by an animal that is being trained to be a service animal, has the right to be accompanied by the service animal in training without being required to pay an extra charge" in the same places (24-34-803(2)). A trainer is "a person who is individually training a service animal to do work or perform tasks." No certification, school or ID is required, and the trainer is liable for damage. See service dogs in training.
Is there a Colorado service dog registration or tag?
No. Colorado has no state service dog ID, tag or registry. It does waive fees: "An individual with a disability who owns a service animal is exempt from any state or local licensing fees or charges that might otherwise apply in connection with owning a similar animal" (24-34-803(5)). Licensing and vaccination rules still apply; only the fee is waived.
A private record such as our voluntary registry is optional and adds no rights.
Housing: service dogs and ESAs in Colorado
Colorado codified the federal guidance HUD withdrew. HB26-1045, signed May 28, 2026 and effective August 12, 2026, says its purpose is "to restore the rescinded federal guidance by codifying it in state law." Its key rules:
- "Permitting an assistance animal in housing is presumed to be a reasonable accommodation."
- "The complete prohibition of assistance animals in housing is presumed to be discriminatory."
- A housing provider may request "reasonable documentation supporting the claim of disability or disability-related need for an assistance animal ... unless the disability or disability related need is obvious."
- "The mere presence of an assistance animal does not constitute a direct threat."
Colorado also penalizes tenants who fake it. Intentionally misrepresenting an animal as an assistance animal to get a housing accommodation, after a prior warning and knowing it is not one, is a civil infraction: $25 first, $50 to $200 second, $100 to $500 after that (C.R.S. 18-13-107.3).
Federal housing law shifted in 2026. HUD withdrew its 2020 assistance animal guidance, and a May 22, 2026 memo says its fair housing office will find reasonable cause in animal cases "only for those cases involving animals trained to provide disability-related assistance." The Fair Housing Act itself did not change and private lawsuits remain possible, so Colorado law matters more than before. See ESA letters and housing after HUD's 2026 change.
ESA letters in Colorado
Colorado regulates the letter writer. A licensed mental health professional "shall not make a determination" about a disability or a disability-related need for an assistance animal "unless the licensee: (a) Has met with the patient in person; (b) Is sufficiently familiar with the patient and the disability; and (c) Is legally and professionally qualified to make the determination" (C.R.S. 12-245-229), and must make written findings. Physicians and nurses have parallel duties. There is no fixed number of days, and HB26-1045 adds no letter-writer rules.
Ask your own clinician, someone who actually treats you. We do not sell or refer ESA letters, and no registration, ID card or certificate substitutes for one. See are online ESA letters legit?.
Employment in Colorado
Colorado's access statute names employment. The right to be accompanied by a trained service animal without an extra charge (24-34-803) lists employment first, and it also covers trainers with a dog in training.
Public-access rules do not govern the workplace. Employment falls under Title I of the ADA: you request an accommodation, and when the disability or need is not obvious your employer may ask for reasonable documentation, which a store may not. EEOC settlements show a trained service dog can be a reasonable accommodation. Put your request in writing. More in service dogs at work.
Misrepresentation penalties in Colorado
Colorado's public-access offense is a petty offense with a warning step. You commit it if you intentionally misrepresent an animal as your service animal or service-animal-in-training to get the rights in 24-34-803, you "previously" received "a written or verbal warning regarding the fact that it is illegal", and you know the animal is not one. Fines are $25 for a first offense, $50 to $200 for a second and $100 to $500 after that (C.R.S. 18-13-107.7, effective 2017). See how other states compare.
Where to file a complaint in Colorado
- A business, hotel, restaurant or government office refused your service dog: report it to the U.S. Department of Justice through the online form linked from its ADA complaint page.
- Housing: Fair Housing Act complaints go to HUD, which now finds cause in animal cases only for trained animals. A private lawsuit is still possible.
- Work: file a charge with the EEOC, generally within 180 calendar days, or 300 days where a state or local agency enforces a similar law.
- Housing in Colorado: HB26-1045 is state law, so a state civil rights complaint does not depend on HUD's narrower federal enforcement.
Comparing states? See Kansas service dog laws, Utah service dog laws and New Mexico service dog laws, or the service dog laws by state table. For the federal baseline, read ADA service dog laws.
Common questions
Do Colorado landlords have to allow emotional support animals?
Since August 12, 2026, HB26-1045 presumes an assistance animal, including an ESA, is a reasonable accommodation, and a landlord may ask for reasonable documentation when the need is not obvious.
Does an ESA letter in Colorado require an in-person meeting?
Yes. A licensed mental health professional must have met the patient in person before making the determination.
Are service dogs in training allowed in Colorado?
Yes. Any trainer, and any person with a disability training a dog, has access without an extra charge.
What happens if you fake a service dog in Colorado?
After a prior warning, a petty offense: $25, then $50 to $200, then $100 to $500.
Sources
- C.R.S. title 24 (24-34-301, 24-34-803), 2024 edition
- C.R.S. title 18 (18-13-107.3, 18-13-107.7), 2024 edition
- C.R.S. title 12 (12-245-229), 2024 edition
- HB26-1045, Disabilities Housing Protections
- DOJ, ADA service animal FAQ
General information, not legal advice. Policies and laws change; follow the sources. Last checked September 25, 2026.