Brush Clearance: Hesperia vs Rialto
How do brush clearance rules compare between Hesperia, CA and Rialto, CA?
Hesperia and Rialto have similar restriction levels.
Hesperia, CA
San Bernardino County
Hesperia contracts with San Bernardino County Fire Hazard Abatement to enforce defensible-space requirements. Weeds and grasses must be cut to no more than 4 inches in height within 30 feet of any structure. State law (PRC §4291) requires 100 ft of defensible space in State Responsibility Areas and Very High Fire Hazard Severity Zones — newly expanded in Hesperia effective July 22, 2025.
View full Hesperia rules →Rialto, CA
San Bernardino County
Rialto Municipal Code §15.28.060 (Vacant Lot Clearance) requires owners of vacant lots and improved parcels to clear weeds, brush, rubbish, and combustible vegetation creating a fire hazard. The Rialto Fire Department administers an annual weed abatement program; non-compliant lots are cleared by the city with costs (plus an administrative fee) becoming a lien on the property.
View full Rialto rules →Key Facts Comparison
| Fact | Hesperia | Rialto |
|---|---|---|
| Weed Height Limit | ≤4 in within 30 ft of structures | - |
| Defensible Space (VHFHSZ) | 100 ft per PRC §4291 | - |
| Zone 0 | 0–5 ft ember-resistant | - |
| Inspections | Spring (weeds) + Fall (tumbleweeds) | - |
| Enforcement | SB County Fire Hazard Abatement (760) 995-8140 | Rialto Fire Dept. + Community Compliance (909-820-8070) |
| WUI Effective | Expanded VHFHSZ maps effective July 22, 2025 | - |
| Local code | - | Rialto Mun. Code §15.28.060 (Vacant Lot Clearance) |
| WUI defensible space | - | 100 ft. per PRC §4291 (5 / 5-30 / 30-100 zones) |
| Annual program | - | Spring weed abatement notices, ~30-day compliance |
| Forced abatement | - | City contracts cleanup + admin fee + tax lien |
Highlighted rows indicate differences between cities.
Hesperia FAQ
How tall can weeds be on my Hesperia property?
Weeds and grasses (other than ornamentals) must be kept to 4 inches or less within 30 feet of any structure. In VHFHSZ areas, PRC §4291 requires 100 feet of defensible space organized into three zones.
Who enforces weed abatement in Hesperia?
San Bernardino County Fire Hazard Abatement enforces under contract with the City. Inspections run twice a year — spring for weeds and grasses, fall for tumbleweeds. Contact (760) 995-8140 option 5.
What happens if I don't clear my weeds?
After notice, a county contractor clears the parcel and the cost plus administrative fees is billed to the owner. Unpaid charges become a tax lien on the property.
Am I in a Very High Fire Hazard Severity Zone?
Possibly — Hesperia's VHFHSZ areas were significantly expanded effective July 22, 2025 under the updated CAL FIRE/OSFM LRA maps. Check the OSFM viewer or contact Hesperia Building & Safety.
Rialto FAQ
When do I need to clear my vacant lot?
By the date stated in your annual weed-abatement notice from Rialto Fire (typically late spring before fire season). Vegetation must be cut to 3 inches or less and combustible debris removed.
What happens if I don't clear my lot?
The city will contract a crew to clear it at your expense, adding administrative overhead (often 25–40%) and recording a lien on your property under Gov. Code §39574.
Does PRC 4291 apply to my Rialto home?
Only if your structure is in or adjacent to a State Responsibility Area or Very High Fire Hazard Severity Zone (mainly the northern foothill / Cajon Pass overlay). Most Rialto residential parcels follow Mun. Code §15.28.060 instead.
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