Outdoor music at a home in unincorporated Douglas County must stay within 55 dB(A) daytime and 50 dB(A) after 7 p.m. In Castle Rock, music and similar devices may not be audible 100 feet away or through a shared wall. Public cultural events are separately exempt.
Backyard speakers and live outdoor music are judged against the county's general noise table (55 dB(A) from 7 a.m.-7 p.m., 50 dB(A) overnight), measured 25 feet from the lot line. Within Castle Rock, the town's audibility test applies -- devices may not be heard 100 feet away or through a common wall. Section 1704A.05 exempts state or local government use of property for cultural, entertainment, athletic or patriotic events such as concerts, music festivals and fireworks displays, but only during the specific authorized period. Private commercial venues fall under the commercial-activity exclusion.
Amplified outdoor music over the limit is a county noise violation; Castle Rock handles audible outdoor music as a municipal offense.
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