Grass Height Limits: Hesperia vs Ontario
How do grass height limits rules compare between Hesperia, CA and Ontario, CA?
Ontario has fewer restrictions than Hesperia.
Hesperia, CA
San Bernardino County
Hesperia contracts with San Bernardino County Fire Hazard Abatement to enforce defensible space. Weeds and grasses must be cut to no more than 4 inches in height within 30 feet of any structure. The High Desert/Mojave WUI environment makes overgrown vegetation a year-round fire hazard, especially tumbleweeds in the fall.
View full Hesperia rules →Ontario, CA
San Bernardino County
Ontario requires owners to keep lawns, parkways, and vacant lots free of overgrown weeds and tall dry grass under the municipal nuisance code. Code Enforcement acts at roughly six inches or on fire risk.
View full Ontario rules →Key Facts Comparison
| Fact | Hesperia | Ontario |
|---|---|---|
| Max Height | 4 inches within 30 ft of structure | - |
| State Floor | PRC §4291 — 100 ft defensible space (WUI) | - |
| Enforcement | SB County Fire Hazard Abatement (contracted) | Code Enforcement 909-395-2025 |
| Inspection Cycle | Spring (weeds) and Fall (tumbleweeds) | - |
| Complaint Line | (760) 995-8140 option 5 | - |
| Authority | - | Ontario Municipal Code nuisance chapters |
| Typical trigger | - | Weeds or dry grass over 6 inches |
| Parkway strip | - | Owner must maintain |
| Abatement | - | City contractor billed to owner |
Highlighted rows indicate differences between cities.
Hesperia FAQ
How tall can grass and weeds be in Hesperia?
Weeds and grasses must be cut to no more than 4 inches in height within 30 feet of any structure. State law (PRC §4291) also requires 100 feet of defensible space around structures in fire hazard zones.
Who enforces weed abatement in Hesperia?
San Bernardino County Fire Hazard Abatement enforces the program under contract with the City. They conduct spring and fall parcel inspections and mail courtesy notices before any abatement action.
Ontario FAQ
Does Ontario have a specific grass height limit?
The code uses a nuisance standard rather than a strict number, but Code Enforcement generally acts on dry grass or weeds over roughly six inches or that create fire or pest risk.
Who mows the strip between sidewalk and curb?
The adjacent property owner is responsible for maintaining parkway strips, including mowing, weed control, and keeping them clear of debris.
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