Grass Height Limits: Castro Valley vs Fremont
How do grass height limits rules compare between Castro Valley, CA and Fremont, CA?
Fremont has fewer restrictions than Castro Valley.
Castro Valley, CA
Alameda County
Alameda County requires weeds and grass to be kept below 12 inches in urbanized areas, with stricter 4-inch limits in Very High Fire Hazard Severity Zones under PRC 4291 defensible space rules.
View full Castro Valley rules →Fremont, CA
Alameda County
Fremont requires lawns and weeds kept below 6 inches citywide, and 4 inches in east foothill VHFHSZ defensible space zones. Overgrown lots are tagged for abatement each spring.
View full Fremont rules →Key Facts Comparison
| Fact | Castro Valley | Fremont |
|---|---|---|
| Urban limit | 12 inches | - |
| VHFHSZ limit | 4 inches | - |
| Inspection season | May-June | - |
| Notice method | Annual mailing | - |
| Non-compliance | Tax lien abatement | - |
| Flatland Limit | - | 6 inches |
| VHFHSZ Limit | - | 4 inches |
| Inspection Season | - | April through October |
| Cure Period | - | 30 days |
| Enforcement | - | Tax lien for costs |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
When is the weed abatement deadline?
Annual deadlines are typically in late May or early June; check your annual notice from the Alameda County Fire Department Weed Abatement Program.
Can I request an extension?
Extensions are sometimes granted for weather or hardship; contact the fire department weed abatement coordinator before the deadline.
Fremont FAQ
Do ornamental grasses count?
Maintained ornamental and native grasses used as intentional landscape are generally exempt. The rule targets dry weeds and invasive annual grasses like wild oats and ripgut brome that become fuel when cured brown.
Who do I call to report a weedy vacant lot?
Call Fremont Fire Prevention at 510-494-4200 or use the Fremont 311 app. Include the parcel address and, if possible, the APN. Inspectors respond within 10 business days during abatement season.
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