Sonoma County, CA Noise Ordinances: Amplified Music & Events (2026)

Sonoma County has been the focal point of California's winery-events noise debate for over a decade. The current framework lives in Chapter 26 (Zoning) of the Sonoma County Code, particularly Article 02 (Definitions and Periodic Special Event provisions) and Article 88 (General Exceptions and Special Use Standards), as amended by the December 9, 2025 Winery Events Ordinance that the Board of Supervisors approved after multiple Planning Commission hearings dating back to 2016 (Ord. 16-0001) and a series of subsequent revisions in 2021, 2023, and 2025. Effective June 9, 2026, the amended Chapter 26 establishes: (1) a maximum of 2,500 attendees for any periodic special event; (2) a 1,600-foot setback from any adjacent property line for outdoor amplified music; (3) a 625-foot setback for unamplified (acoustic) outdoor music; (4) a 450-foot setback for event parking from adjacent property lines; (5) operating standards for sizing, hours of operation, third-party rentals, on-site parking, food service, traffic management; and (6) mandatory compliance with the General Plan Noise Element Table NE-2 limits (50 dBA daytime L50, 45 dBA nighttime L50). The ordinance applies to new and modified use-permit applications for winery visitor-serving uses in agricultural zoning districts (LIA, LEA, DA, RRD) outside the Coastal Zone. Existing wineries with valid use permits keep their vested rights unless they apply for a modification. Outside the winery-event context, outdoor amplified music at residences, special events, concerts at vineyards or ranches, weddings, and similar gatherings is governed by Sonoma County Code Chapter 3, Article III (Noise Control), the underlying use permit if any, and - for one-time events - the Permit Sonoma Special Events permit process (PJR-024). Special-event permits typically condition amplified music to end by 10:00 p.m. on weekdays and 11:00 p.m. on weekends, with the same 1,600/625/450-foot setback framework where the event is in an agricultural zone. Cannabis cultivation and processing facilities have their own noise mitigation conditions under the Cannabis Land Use Ordinance. Inside cities (Santa Rosa, Petaluma, Sonoma, Sebastopol, Healdsburg, Cotati, Rohnert Park, Windsor, Cloverdale) separate municipal codes govern - for example, Sonoma Municipal Code Ch. 9.56 sets a 60 dBA daytime / 55 dBA nighttime limit and the City requires entertainment permits for amplified music. The history is rooted in pressure from Sonoma Valley, Westside Road (Russian River AVA), Dry Creek Valley, and Alexander Valley neighborhoods that documented frequent violations of older rules; the Sonoma County Vintners and the Sonoma County Winegrowers negotiated the 2025 standards as a compromise that preserves event-based hospitality revenue while restoring quiet for adjacent residences.