Quiet hours in Thornton, CO — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Thornton enforces quiet hours 10 PM to 7 AM. The I-25 corridor through Thornton generates traffic noise regulated by CDOT sound barriers. Newer developments in north Thornton may experience construction noise from rapid growth.
Thornton municipal code establishes quiet hours and residential noise limits. Colorado Revised Statutes §18-9-106 provides statewide enforcement for unreasonable noise as a Class 1 petty offense. Most Colorado cities set residential limits around 55 dBA daytime, 50 dBA nighttime at the property line. Exemptions for emergency vehicles and city operations. CDPHE handles industrial noise complaints at the state level.
First offense: warning or citation $150 to $500. Repeat violations may escalate. Class 1 petty offense under CRS §18-9-106: up to $500 fine.
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 restricts or prohibits intentional feeding of wildlife including deer, coyotes, and bears. Feeding wildlife creates public safety hazards and nuisan...
Side-by-side rule comparisons with other cities in Adams County.
See how other cities in Adams County handle quiet hours.
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