Quiet Hours: 11PM-7AM (for amplified sound in residential areas)
Residential Decibel Limit: 55 dBA (7 AM-11 PM) (Day) / 55 dBA (11 PM-7 AM) (Night)
Summary: Boulder, CO's Chapter 5-9: Noise ordinance prohibits unreasonable noise, including amplified sound audible beyond specified distances and decibel limits. Daytime (7 AM-11 PM) amplified residential noise is restricted if audible 200+ feet, while nighttime (11 PM-7 AM) is restricted at 100+ feet. Construction, power tools, and vehicle noise also have specific limitations and quiet hours.