Amplified music rules in Boulder County, CO — also called sound permit, PA system, or live music ordinances — set decibel limits, time-of-day restrictions, and when permits are required.
Amplified music in unincorporated Boulder County counts against the residential noise caps of 55 dB(A) day and 50 dB(A) night. Music from a parked vehicle is treated as a non-vehicular source, measured 10 feet from the property line.
Ordinance No. 92-28 treats amplified music under its general sound limits. Section 1.01.040(C) provides that "The sound of amplified music from a non-moving vehicle on private property or public property which is not a road or highway shall be considered 'sound from a non-vehicular source,'" so it is measured 10 feet from the property line against the 55 dB(A) daytime / 50 dB(A) nighttime residential caps. Music from a moving vehicle is measured at 50 feet. Impulsive or shrill sound is unlawful at 5 dB(A) below the limit. State-permitted concerts and music festivals are exempt under Sec 1.01.060(C).
Amplified music over the applicable limit is a Class 2 Petty Offense: $30 per violation, escalating to a $300 maximum for repeats within one year, plus court costs.
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