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California wildfire hazard zones, county by county

All 58 counties, with the Fire Hazard Severity Zone classes CAL FIRE's statewide service records in each. The column that matters most is the last one.

Why "reaches incorporated land" is the useful split

Hazard-class presence barely varies across California: 56 of 58 counties have Very High, High and Moderate zones somewhere on state responsibility land. Knowing that a county contains a Very High zone therefore tells you almost nothing.

What does vary is whether Very High reaches locally governed land — the incorporated cities and towns. In 33 counties it does, which means ordinary in-town addresses can carry the state's highest hazard rating rather than the exposure being confined to the rural edge. In 23 counties it does not. 2 have no mapped zones at all (San Francisco and Sutter).

CountyResidentsState land (SRA)Local land (LRA)Very High reach
Alameda 1,573,254 Very HighHighModerate Very High Reaches incorporated land
Alpine 1,079 Very HighHighModerate None mapped State land only
Amador 36,151 Very HighHighModerate Very High Reaches incorporated land
Butte 222,316 Very HighHighModerate Very High Reaches incorporated land
Calaveras 44,650 Very HighHighModerate Very High Reaches incorporated land
Colusa 21,660 Very HighHighModerate None mapped State land only
Contra Costa 1,087,008 Very HighHighModerate Very High Reaches incorporated land
Del Norte 28,131 Very HighHighModerate None mapped State land only
El Dorado 182,404 Very HighHighModerate Very High Reaches incorporated land
Fresno 964,040 Very HighHighModerate None mapped State land only
Glenn 28,353 Very HighHighModerate None mapped State land only
Humboldt 134,648 Very HighHighModerate None mapped State land only
Imperial 180,672 Very HighHighModerate Very High Reaches incorporated land
Inyo 18,590 Very HighHighModerate None mapped State land only
Kern 873,092 Very HighHighModerate None mapped State land only
Kings 150,181 Very HighHighModerate None mapped State land only
Lake 64,699 Very HighHighModerate Very High Reaches incorporated land
Lassen 32,581 Very HighHighModerate Very High Reaches incorporated land
Los Angeles 10,041,797 Very HighHighModerate Very High Reaches incorporated land
Madera 153,897 Very HighHighModerate None mapped State land only
Marin 255,846 Very HighHighModerate Very High Reaches incorporated land
Mariposa 18,467 Very HighHighModerate None mapped State land only
Mendocino 89,029 Very HighHighModerate Very High Reaches incorporated land
Merced 264,922 Very HighHighModerate None mapped State land only
Modoc 9,197 Very HighHighModerate None mapped State land only
Mono 14,143 Very HighHighModerate Very High Reaches incorporated land
Monterey 425,756 Very HighHighModerate Very High Reaches incorporated land
Napa 139,255 Very HighHighModerate Very High Reaches incorporated land
Nevada 97,225 Very HighHighModerate Very High Reaches incorporated land
Orange 3,113,991 Very HighHighModerate Very High Reaches incorporated land
Placer 366,115 Very HighHighModerate Very High Reaches incorporated land
Plumas 19,140 Very HighHighModerate Very High Reaches incorporated land
Riverside 2,279,967 Very HighHighModerate Very High Reaches incorporated land
Sacramento 1,454,406 Very HighHighModerate Very High Reaches incorporated land
San Benito 57,517 Very HighHighModerate None mapped State land only
San Bernardino 2,085,669 Very HighHighModerate Very High Reaches incorporated land
San Diego 3,194,362 Very HighHighModerate Very High Reaches incorporated land
San Francisco 836,620 None mapped None mapped No zones mapped
San Joaquin 710,731 Very HighHighModerate None mapped State land only
San Luis Obispo 272,357 Very HighHighModerate Very High Reaches incorporated land
San Mateo 745,193 Very HighHighModerate Very High Reaches incorporated land
Santa Barbara 433,398 Very HighHighModerate Very High Reaches incorporated land
Santa Clara 1,868,558 Very HighHighModerate Very High Reaches incorporated land
Santa Cruz 271,595 Very HighHighModerate None mapped State land only
Shasta 179,412 Very HighHighModerate Very High Reaches incorporated land
Sierra 3,089 Very HighHighModerate None mapped State land only
Siskiyou 45,231 Very HighHighModerate Very High Reaches incorporated land
Solano 424,233 Very HighHighModerate None mapped State land only
Sonoma 490,486 Very HighHighModerate Very High Reaches incorporated land
Stanislaus 526,042 Very HighHighModerate None mapped State land only
Sutter 95,733 None mapped None mapped No zones mapped
Tehama 63,717 Very HighHighModerate Very High Reaches incorporated land
Trinity 13,389 Very HighHighModerate None mapped State land only
Tulare 459,446 Very HighHighModerate None mapped State land only
Tuolumne 53,604 Very HighHighModerate Very High Reaches incorporated land
Ventura 842,967 Very HighHighModerate Very High Reaches incorporated land
Yolo 206,381 Very HighHighModerate None mapped State land only
Yuba 73,682 Very HighHighModerate None mapped State land only
Presence, not coverage. These are the classes that occur somewhere in each county. No percentage of area is shown: the hazard service returns whole polygons that intersect a county rather than polygons clipped to it, so any share figure would overcount by an unknown amount.

Check a specific address

Zone boundaries do not follow parcel lines, so the county answer is not the property answer. This returns the Fire Hazard Severity Zone and FEMA flood zone for one address, read live from the state and federal services.

Sources. CAL FIRE statewide Fire Hazard Severity Zone service, and the California state county boundaries service for names, FIPS codes and population. Snapshot taken August 19, 2026. This table is also available as a CSV download.