Ontario has no blanket overnight parking ban on residential streets, but vehicles cannot remain more than 72 hours under CVC 22651(k) and posted permit-district signage near ONT airport is enforced from 10 PM to 6 AM.
Unlike some California cities, Ontario does not impose a citywide overnight parking prohibition on residential streets. Most blocks allow legal overnight parking as long as the vehicle is moved at least once every 72 hours, under California Vehicle Code 22651(k) as adopted by Ontario Municipal Code Chapter 10. However, several preferential parking districts near Ontario International Airport, Ontario Mills, and downtown do post overnight restrictions typically from 10 PM to 6 AM requiring a resident permit sticker. Street sweeping posted days remain in force regardless of overnight status. Recreational vehicles, trailers, and commercial vehicles face stricter overnight rules under OMC 10, including the 10 PM to 6 AM ban on heavy commercial vehicles. Homeless vehicle-habitation enforcement follows the 2018 Martin v. Boise standard and city case-management protocols rather than a blanket ban. Residents concerned about a vehicle left overnight should report to Ontario Police non-emergency at (909) 986-6711.
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 overnight parking.
See how Ontario's overnight parking rules stack up against other locations.
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