Colorado has no statewide breed ban preemption. Some cities had pit bull bans (Denver repealed 2020, Aurora repealed 2021). Check Thornton ordinance.
Colorado does not preempt breed-specific legislation at the state level. Cities can enact breed bans or restrictions. Denver had a pit bull ban from 1989 to 2020 (repealed by voter initiative). Aurora repealed its pit bull ban in 2021. The trend in Colorado is toward repeal, but some cities may still have breed restrictions. CRS §18-9-204.5 provides for behavior-based dangerous dog designations. HOAs may have breed restrictions in CC&Rs.
Breed ban violations: impoundment and fines per city ordinance. Dangerous dog violations: escalating penalties.
Thornton, CO
Thornton prohibits storing abandoned, inoperable, or unregistered vehicles on public streets or visible on private property. Vehicles may be tagged and towed...
Thornton, CO
Thornton regulates electric vehicle charging infrastructure for residential and commercial properties. Building codes may require EV-ready parking in new con...
Thornton, CO
Thornton regulates overnight parking on public streets. Many areas restrict parking between certain hours or require permits for overnight street parking.
Thornton, CO
Thornton requires pool barriers meeting safety codes to prevent drowning. Fences must be at least 4 to 5 feet tall with self-closing, self-latching gates.
Thornton, CO
Thornton requires permits for retaining walls above a certain height, typically 4 feet. Engineering review may be required for taller walls.
Thornton, CO
Thornton may have wildfire hazard zones requiring defensible space around structures, fire-resistant building materials, and vegetation management.
Side-by-side rule comparisons with other cities in Adams County.
See how other cities in Adams County handle breed restrictions.
See how Thornton's breed restrictions rules stack up against other locations.
Quick Compare
Help us keep this page accurate. If you notice an error or outdated information, let us know.