Modesto, CA Fire Regulations: Brush Clearance (2026)
Key Facts
- Lawn Height Trigger
- 12 inches (MMC 9-9.509)
- Code Section
- MMC 9-9.509 (Property Maintenance)
- FHSZ Status
- Not Very High; LRA
- PRC 4291 (100 ft)
- Does not generally apply inside city
- State Authority
- Cal. H&S Code 13869
- Enforcement
- Code Enforcement + Fire Prevention Bureau
- Abatement
- City may abate and lien costs
Summary
Modesto sits on the Central Valley floor outside CAL FIRE's State Responsibility Area and is not mapped as a Very High Fire Hazard Severity Zone, so the wildland-urban-interface 100-foot defensible space rule of Public Resources Code 4291 does not generally apply. The city instead enforces brush, weed, and dead-vegetation clearance through Modesto Municipal Code 9-9.509 (Property Maintenance Code), with a 12-inch lawn-height threshold and Fire Prevention Bureau coordination.
4291. (a) A person who owns, leases, controls, operates, or maintains a building or structure in the state responsibility area shall at all times do all of the following: (1) (A) Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line, except as provided in subparagraph (B). The amount of fuel modification necessary shall consider the flammability of the structure as affected by building material, building standards, location, and type of vegetation. Fuels shall be maintained and spaced in a condition so that a wildfire would be unlikely to ignite the structure.
Full Breakdown
Because the City of Modesto lies on the valley floor and is served by the Modesto Fire Department within the Local Responsibility Area, properties inside city limits are typically not designated as State Responsibility Area or Very High Fire Hazard Severity Zone parcels under CAL FIRE mapping. As a result, the 100-foot defensible space requirement in Public Resources Code 4291 (which applies in SRA and Very High FHSZ Local Responsibility Area parcels) does not blanket-apply to Modesto residential lots. 509, which targets neglected or inadequately maintained landscaping, trees, hedges, lawns, shrubs, and other vegetation that is dead, decayed, diseased, debris-laden, weed-infested, overgrown, or dying from neglect, disease, pest infestation, or lack of water.
A lawn area is treated as overgrown if any part exceeds 12 inches in height, and vegetation that obstructs traffic visibility, sidewalks, or rights-of-way is also a violation. The Modesto Fire Department's Fire Prevention Bureau coordinates with code enforcement on parcels that present a true fire hazard, and California Health and Safety Code section 13869 authorizes local fire authorities to adopt stricter local fire-prevention regulations. Properties on the city edge that border unincorporated Stanislaus County grasslands or river-corridor parcels should still maintain practical clearance (15-30 feet of lean-clean-green) because adjoining unincorporated land may be subject to PRC 4291 if mapped.
Violations & Fines
Allowing weeds or grass to exceed 12 inches, leaving accumulations of dead brush or debris, or maintaining vegetation that blocks sightlines on a public right-of-way can trigger code enforcement notices, administrative citations, and city-performed abatement with costs and a special assessment recorded against the parcel.
Frequently Asked Questions
Do I need 100 feet of defensible space around my Modesto home?
How tall can grass get before it is a violation?
What if my parcel borders unincorporated grasslands?
Sources & Official References
Other rules in Modesto
California rules heatmap·Compare Modesto to another location·View the California fire regulations overview
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