California Fire Hazard Severity Zones (FHSZ) by county
What California's Fire Hazard Severity Zones actually measure, why a hazard zone is not an insurer's decision, and how to look up wildfire hazard for any of the 58 counties.

Hazard is not the same as your insurance risk
A Fire Hazard Severity Zone measures long-term physical wildfire hazard - vegetation, terrain, weather, and fire history - to guide land-use planning, building codes, and defensible-space rules. It is not an insurer's property-level underwriting score or catastrophe model. The California Department of Insurance has stated that CAL FIRE's maps do not by themselves determine insurance rates or availability, so a zone designation is one input among many, not the decision.
When carriers price a home and decide whether to write it, they may evaluate factors such as:
- Roof type and age, and overall construction
- Surrounding vegetation and defensible space
- Slope, terrain, and road access
- Distance from a fire station and available water supply
- Replacement cost and the home's loss history
- Their own proprietary wildfire catastrophe models
Look up any address on the official CAL FIRE Fire Hazard Severity Zone Viewer.
Look up wildfire hazard by county
Use the table below as a reference for how CAL FIRE classifies overall wildfire hazard across California's 58 counties. Remember that this is a planning-level hazard summary, not an insurer's decision or a parcel-level score - select any county for its full profile and coverage options.
| County | Region | Wildfire hazard (CAL FIRE) |
|---|---|---|
| Alpine County | Sierra Nevada | High |
| Amador County | Gold Country | High |
| Butte County | Sacramento Valley | High |
| Calaveras County | Gold Country | High |
| El Dorado County | Sierra Nevada | High |
| Lake County | North Coast | High |
| Lassen County | Far North | High |
| Los Angeles County | Southern California | High |
| Madera County | Central Valley | High |
| Marin County | Bay Area | High |
| Mariposa County | Sierra Nevada | High |
| Mendocino County | North Coast | High |
| Modoc County | Far North | High |
| Mono County | Eastern Sierra | High |
| Monterey County | Central Coast | High |
| Napa County | Bay Area | High |
| Nevada County | Sierra Nevada | High |
| Placer County | Sierra Nevada | High |
| Plumas County | Sierra Nevada | High |
| Riverside County | Inland Empire | High |
| San Bernardino County | Inland Empire | High |
| San Diego County | Southern California | High |
| San Luis Obispo County | Central Coast | High |
| Santa Barbara County | Central Coast | High |
| Santa Cruz County | Central Coast | High |
| Shasta County | Far North | High |
| Sierra County | Sierra Nevada | High |
| Siskiyou County | Far North | High |
| Sonoma County | Bay Area | High |
| Tehama County | Sacramento Valley | High |
| Trinity County | Far North | High |
| Tulare County | Central Valley | High |
| Tuolumne County | Sierra Nevada | High |
| Ventura County | Southern California | High |
| Alameda County | Bay Area | Moderate |
| Colusa County | Sacramento Valley | Moderate |
| Contra Costa County | Bay Area | Moderate |
| Del Norte County | North Coast | Moderate |
| Fresno County | Central Valley | Moderate |
| Glenn County | Sacramento Valley | Moderate |
| Humboldt County | North Coast | Moderate |
| Inyo County | Eastern Sierra | Moderate |
| Kern County | Central Valley | Moderate |
| Orange County | Southern California | Moderate |
| San Benito County | Central Coast | Moderate |
| San Mateo County | Bay Area | Moderate |
| Santa Clara County | Bay Area | Moderate |
| Solano County | Bay Area | Moderate |
| Yuba County | Sacramento Valley | Moderate |
| Imperial County | Southern California | Low |
| Kings County | Central Valley | Low |
| Merced County | Central Valley | Low |
| Sacramento County | Sacramento Valley | Low |
| San Francisco County | Bay Area | Low |
| San Joaquin County | Central Valley | Low |
| Stanislaus County | Central Valley | Low |
| Sutter County | Sacramento Valley | Low |
| Yolo County | Sacramento Valley | Low |
Hazard levels are a qualitative county-level summary derived from CAL FIRE data, not parcel-level scores. Check a specific address on the CAL FIRE viewer linked below.
Wildfire exposure makes some California homes hard to place in the standard market. As an independent broker we shop admitted carriers across all 58 counties, and where the market is limited we access surplus lines markets and the California FAIR Plan paired with a difference-in-conditions wrap.
Sources
California FHSZ FAQ
What is a Fire Hazard Severity Zone (FHSZ) in California?
A Fire Hazard Severity Zone is a CAL FIRE classification of wildfire hazard - Moderate, High, or Very High - based on vegetation, terrain, weather, and fire history. The zones drive building codes and defensible-space rules. They measure physical hazard and are not an insurer's underwriting score.
Do Fire Hazard Severity Zones set home insurance rates?
No. The California Department of Insurance has stated that CAL FIRE's maps do not by themselves determine insurance rates or availability. A zone is one input; insurers price each property on its own characteristics, such as roof and construction, defensible space, access, replacement cost, loss history, and their own catastrophe models. Wildfire-exposed homes may still need surplus lines carriers or the California FAIR Plan.
Which California counties have the highest wildfire hazard?
Counties such as Napa, Sonoma, Lake, Butte, El Dorado, Nevada, Shasta, and Plumas carry high CAL FIRE wildfire hazard. Select any county above for its full Fire Hazard Severity Zone profile and coverage options.
What is the California FAIR Plan?
The California FAIR Plan is the state's insurer of last resort for fire coverage when the standard market declines. It is available statewide and is commonly paired with a difference-in-conditions wrap for theft, liability, and water damage it does not cover.
Insuring a wildfire-exposed California home?
Turned down elsewhere? That is exactly who we help. Tell us what you need and a licensed California agent will reach out with real options.
Prefer to talk? Call (916) 469-5253.
