Wildfire Zones: Castro Valley vs Fremont
How do wildfire zones rules compare between Castro Valley, CA and Fremont, CA?
Castro Valley and Fremont have similar restriction levels.
Castro Valley, CA
Alameda County
Much of east Alameda County including the Oakland Hills, Castro Valley, and Sunol foothills is designated Very High Fire Hazard Severity Zone by CAL FIRE, triggering strict defensible space rules.
View full Castro Valley rules →Fremont, CA
Alameda County
Fremont east foothills including Mission Peak, Weibel, Vargas Plateau, and Niles Canyon are mapped as Very High Fire Hazard Severity Zones by CAL FIRE, triggering stricter building and clearance rules.
View full Fremont rules →Key Facts Comparison
| Fact | Castro Valley | Fremont |
|---|---|---|
| Zone designation | CAL FIRE VHFHSZ | - |
| Defensible space | PRC 4291, 100 feet | - |
| Building standard | CBC Chapter 7A | - |
| Disclosure | CA Civil Code 1103 | - |
| Historic fire | 1991 Oakland Hills Firestorm | - |
| VHFHSZ Coverage | - | About 30 percent of city |
| Key Areas | - | Mission Peak, Weibel, Vargas, Niles |
| Build Code | - | CBC Chapter 7A |
| Defensible Space | - | 100 ft required |
| Real Estate | - | NHD plus AB 38 disclosure |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
How do I find out if my property is in a VHFHSZ?
Use the CAL FIRE Fire Hazard Severity Zone Viewer online or contact the Alameda County Fire Department to confirm your parcel status.
What are the insurance implications?
VHFHSZ properties face higher premiums, non-renewals, and may need the California FAIR Plan; completing home hardening can help qualify for the Safer From Wildfires program discounts.
Fremont FAQ
How do I check if my Fremont home is in a VHFHSZ?
Use the CAL FIRE Fire Hazard Severity Zone viewer at osfm.fire.ca.gov or contact Fremont Fire Prevention at 510-494-4200 with your address for a written determination.
Does VHFHSZ affect my insurance?
Yes. Many carriers non-renew VHFHSZ policies. The California FAIR Plan is the insurer of last resort. Completing home hardening and defensible space can qualify you for the Safer from Wildfires insurance discount.
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