Quiet hours in Ontario, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Ontario enforces nighttime quiet under OMC Title 5 Chapter 29. Loud or intrusive noise that disturbs the peace between 10 PM and 7 AM is stricter enforced, coordinated by Ontario Police and Code Enforcement.
Ontario Municipal Code Section 5-29.07 prohibits loud, excessive, impulsive, or intrusive noise that disturbs the peace of any area, and nighttime standards (generally 10 PM to 7 AM) are applied more strictly than daytime levels. Because Ontario sits beneath Ontario International Airport (ONT) flight paths and hosts dense warehouse and freight operations along the I-10, I-15, and CA-60 corridors, the city relies on the general nuisance framework plus zoning-based exterior noise limits to address parties, amplified music, truck idling, backyard speakers, and barking dogs during quiet hours. Officers responding to a complaint typically issue a warning and ask the responsible party to reduce the noise. Continued disturbance after a request to cease is the key trigger for a citation under Section 5-29.07. Residents can call the Ontario Police Department non-emergency line for active disturbances at night and Code Enforcement for daytime or repeat issues.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle quiet hours.
See how Ontario's quiet hours rules stack up against other locations.
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