1 county-level rule, plus city-specific rules for 2 cities in Boulder County, Colorado.
Verified from official government sources
Boulder County Ordinance 92-28 sets residential noise limits of 55 dB(A) from 7:00 AM to 7:00 PM and 50 dB(A) from 7:00 PM to 7:00 AM in unincorporated areas. Lawnmowers and power tools under 5 hp are permitted 7:00 AM to 10:00 PM under CRS §25-12.
Boulder County Ordinance 92-28, Section 1.01.050 (Prohibited Noise Levels)
SECTION 1.01.050 Prohibited Noise Levels. C. Sound from a non-vehicular source located in a residential area, shall not exceed the following limits: 7:00 a.m.-7 p.m. of the same day: 55 dB(A); 7:00 p.m.-7 a.m. of the following day: 50 dB(A). D. Construction projects in residential areas shall not exceed the following noise levels for the period within which construction is to be completed pursu...
2 cities in Boulder County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
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