San Mateo County, CA Property Maintenance: Snow & Sidewalk Clearing (2026)
Key Facts
- Local Climate
- Snow very rare
- Responsibility
- Abutting property owner
- State Law
- Streets & Highways §5610
- State Routes
- Caltrans plows
- Time Deadline
- Not specified
Summary
Snow sidewalk clearing is not a regular concern in unincorporated San Mateo County's Mediterranean coastal climate, and the County has no dedicated snow-clearance ordinance. On the rare occasions of snow at Skyline Ridge or upper La Honda/Kings Mountain elevations, Caltrans clears State Routes 35, 84, and 92, while property owners are generally responsible for keeping their own driveways and sidewalks (where they exist) passable. Streets & Highways Code §§5610-5618 gives local agencies general authority over abutting-property sidewalk maintenance.
5610. The owners of lots or portions of lots fronting on any portion of a public street or place when that street or place is improved or if and when the area between the property line of the adjacent property and the street line is maintained as a park or parking strip, shall maintain any sidewalk in such condition that the sidewalk will not endanger persons or property and maintain it in a condition which will not interfere with the public convenience in the use of those works or areas save and except as to those conditions created or maintained in, upon, along, or in connection with such sidewalk by any person other than the owner, under and by virtue of any permit or right granted to him by law or by the city authorities in charge thereof, and such persons shall be under a like duty in relation thereto.
Full Breakdown
San Mateo County sits in USDA zones 9b-10a with average low temperatures well above freezing; snow occurs only sporadically at elevations above 2,000 feet (Skyline Ridge, Kings Mountain, upper La Honda). The County does not have a snow-removal ordinance because the hazard is rare. General sidewalk maintenance by abutting property owners is governed by California Streets & Highways Code §§5610-5618, which places responsibility on the adjacent property owner for keeping sidewalks in safe condition: including removing accumulated debris, vegetation, and rarely, snow/ice. When winter storms deliver snow at ridge elevations, Caltrans handles State Routes 35 (Skyline), 84 (La Honda Road), and 92 (Half Moon Bay Road), and the County Public Works crews clear major County roads. Property owners remain responsible for their driveways and the immediately adjacent sidewalk/shoulder. Ice on sidewalks from freezing fog or pipe leaks is more common than snow and creates slip-and-fall liability under general premises-liability law. No minimum clearance width or time deadline is specified.
Violations & Fines
Slip-and-fall on unmaintained sidewalk: civil liability for negligence. Failure to clear after County notice under §5610: County may abate and bill owner. Chronic unmaintained sidewalk: nuisance citation $50-$250 under County Code.
Frequently Asked Questions
Does San Mateo County have any snow-clearance requirements?
Who clears roads to Kings Mountain and Skyline during a snow event?
Sources & Official References
Other rules in San Mateo County
California rules heatmap·Compare San Mateo County to another location·View the California property maintenance overview
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