Animal Ordinances in Thornton, CO (2026)
6 verified animal ordinances for Thornton, Colorado, sourced directly from the municipal code and official government pages.
Verified from official government sources
Chickens & Livestock
Thornton allows up to 6 hens on residential lots with a permit. No roosters. North Thornton's larger lot developments near E-470 may accommodate more poultry with appropriate setbacks.
Thornton Chickens & Livestock Rules
Some RestrictionsDog Leash Laws
Thornton requires dogs on leash in public. Off-leash in designated parks only. License and rabies vaccination required. CRS §18-9-202 covers dogs at large.
Thornton Dog Leash Laws
Some RestrictionsBreed Restrictions
Colorado has no statewide breed ban preemption. Some cities had pit bull bans (Denver repealed 2020, Aurora repealed 2021). Check Thornton ordinance.
Thornton Dog Breed Restrictions
Some RestrictionsBeekeeping
Thornton may allow residential beekeeping with hive limits and setbacks. Colorado Bee Act (CRS §35-80-101) requires apiary registration.
Thornton Beekeeping Rules
Some RestrictionsExotic Pets
Thornton restricts ownership of exotic and wild animals. Many species require special permits or are prohibited entirely for public safety.
Thornton Exotic & Wild Animal Regulations
Heavy RestrictionsWildlife Feeding
Thornton restricts or prohibits intentional feeding of wildlife including deer, coyotes, and bears. Feeding wildlife creates public safety hazards and nuisance conditions.
Thornton Wildlife Feeding Restrictions
Some RestrictionsLooking for Adams County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Thornton city rules.
Animal Ordinances in Adams County →