Quiet hours in Rocklin, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Unincorporated Placer County regulates noise under Placer County Code Chapter 9, Article 9.36. Daytime (7:00 a.m. to 10:00 p.m.) exterior sound at residential property lines is generally limited to 55 dBA Leq hourly average, and the standard drops at night (10:00 p.m. to 7:00 a.m.).
Placer County Code Section 9.36.040 sets sound measurement methodology (A-weighted, slow response, taken at the property line of the affected sensitive receptor). Section 9.36.060 sets numerical sound limits for sensitive receptors. The five-decibel reduction in Section 9.36.060 applies to simple tone, speech, and music. Sound limits apply to non-transportation noise sources such as stationary equipment, amplified speech, and music. Vehicle, train, aircraft, and emergency-equipment noise are addressed through separate state and federal frameworks. Local cities (Roseville, Rocklin, Lincoln, Auburn, Loomis, Colfax) have their own municipal noise codes that may differ from the county standard.
Violations of Chapter 9 are enforced by Placer County Code Compliance Services and the Sheriff's Office. Sustained or repeat violations can be charged as infractions or misdemeanors under the Placer County Code's general penalty provisions in Chapter 1.
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Side-by-side rule comparisons with other cities in Placer County.
See how Rocklin's quiet hours rules stack up against other locations.
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