Quiet hours in Northglenn, CO — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Unincorporated Adams County has no separate noise ordinance; the Colorado state noise statute applies. In residential zones, noise measured 25 feet beyond your property line may not exceed 55 dB(A) daytime (7am-7pm) or 50 dB(A) at night.
Colorado counties enforce the statewide Noise Abatement Act, CRS 25-12-103, in the unincorporated county. Sound radiating past a property line at 25 feet or more that exceeds the residential limit is prima facie evidence of a public nuisance. The nighttime period (7pm to next 7am) drops the residential cap to 50 dB(A). Inside incorporated cities (Brighton, Commerce City, Thornton, Northglenn, Federal Heights) the city's own noise ordinance governs, and those often set stricter clock-based quiet hours. The Sheriff and county code enforcement respond to unincorporated-area complaints.
Exceeding the limit is prima facie evidence of a public nuisance; enforced by the Sheriff/code enforcement, abatable as a nuisance under state law.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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