Outdoor and event music in unincorporated Mendocino County falls under the Chapter 8.100 noise ordinance adopted in 2026. Nighttime (10:00 p.m. to 7:00 a.m.) amplified sound is capped at 60 decibels continuous / 75 decibels intermittent at an adjacent residential property, with exemptions for school and public-agency activities.
Outdoor concerts, weddings, festivals and similar amplified events in the unincorporated county are subject to the general noise standards in Chapter 8.100 (Ordinance 4558, adopted April 7, 2026). During the nighttime quiet period of 10:00 p.m. to 7:00 a.m., sound from amplifiers and musical instruments may not exceed 60 decibels continuous or 75 decibels intermittent measured from an adjacent residential property. The ordinance exempts school activities, public-agency work and emergency operations, and protects activities covered by the county's right-to-farm and right-to-industry provisions, but it does not exempt private commercial events from the nighttime limits. Larger gatherings may separately require a use permit or temporary event permit from Mendocino County Planning & Building Services, which can attach its own noise and curfew conditions. Event organizers in places like Anderson Valley wine country, the Mendocino coast or Hopland should confirm both the Chapter 8.100 limits and any permit conditions before scheduling late-night amplified music.
Enforced by the Sheriff's Office under Chapter 8.100 (warning, then infraction, then potential public-nuisance designation). Permitted events may also face permit-condition enforcement by Planning & Building Services.
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