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California wildfire risk

58 counties scored 4 rated Very High

Riverside County has the highest wildfire risk in California, scoring 100 out of 100 — rated "Very High" by FEMA's National Risk Index.

# County NRI score Rating NOAA events
2016–2026
1 Riverside County 100 Very High 0
2 San Diego County 100 Very High 1
3 Los Angeles County 99.9 Very High 0
4 San Bernardino County 99.9 Very High 0
5 Orange County 99.8 Relatively High 0
6 Ventura County 99.8 Relatively High 0
7 El Dorado County 99.7 Relatively High 0
8 Kern County 99.7 Relatively High 0
9 Calaveras County 99.5 Relatively High 0
10 Shasta County 99.5 Relatively High 0
11 Madera County 99.4 Relatively High 0
12 Nevada County 99.4 Relatively High 0
13 Tuolumne County 99.3 Relatively High 0
14 Santa Barbara County 99.2 Relatively High 0
15 Lake County 99.1 Relatively High 0
16 Mariposa County 99 Relatively High 0
17 Monterey County 98.7 Relatively High 0
18 Placer County 98.7 Relatively High 0
19 Plumas County 98.6 Relatively High 0
20 Siskiyou County 98.6 Relatively High 0
21 Butte County 98.5 Relatively High 0
22 Tehama County 98.5 Relatively High 0
23 Trinity County 98.5 Relatively High 0
24 Fresno County 98.4 Relatively High 0
25 San Luis Obispo County 98.3 Relatively High 0
26 Sonoma County 98.2 Relatively High 0
27 Amador County 98.1 Relatively High 0
28 Tulare County 98 Relatively High 0
29 Mendocino County 97.8 Relatively High 0
30 Alameda County 97.7 Relatively High 0
31 Contra Costa County 97.6 Relatively Moderate 0
32 Lassen County 97.5 Relatively Moderate 0
33 Santa Clara County 97.4 Relatively Moderate 0
34 Santa Cruz County 97.3 Relatively Moderate 0
35 Yuba County 96.8 Relatively Moderate 0
36 Napa County 96 Relatively Moderate 0
37 Sacramento County 95.9 Relatively Moderate 0
38 Sierra County 95.6 Relatively Moderate 0
39 Humboldt County 95.5 Relatively Moderate 0
40 San Benito County 95.4 Relatively Moderate 0
41 Stanislaus County 95 Relatively Moderate 0
42 Marin County 94.6 Relatively Moderate 0
43 Solano County 94.5 Relatively Moderate 0
44 Modoc County 92.9 Relatively Moderate 0
45 Merced County 92.2 Relatively Moderate 0
46 San Joaquin County 92 Relatively Moderate 0
47 San Mateo County 92 Relatively Moderate 0
48 Glenn County 91.8 Relatively Moderate 0
49 Mono County 91.2 Relatively Moderate 0
50 Alpine County 89.1 Relatively Moderate 0
51 Colusa County 89.1 Relatively Moderate 0
52 Yolo County 87 Relatively Low 0
53 Del Norte County 85.7 Relatively Low 0
54 Inyo County 83.7 Relatively Low 0
55 Kings County 77.1 Relatively Low 0
56 Sutter County 77.1 Relatively Low 0
57 Imperial County 76 Relatively Low 0
58 San Francisco County 28.7 Very Low 0

Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.

Wildfire risk nationally:

Top 50 US counties

Other hazard risks in California:

Inland FloodingCoastal FloodingEarthquakeHeat WaveTornadoHurricaneHailStrong WindWinter WeatherIce StormCold WaveLightningDroughtLandslideAvalancheTsunamiVolcanic Activity

Frequently asked questions

What is the highest wildfire risk county in California?

Riverside County, CA has the highest wildfire risk in California, with a FEMA National Risk Index score of 100 out of 100 (rated "Very High").

How many counties in California are rated Very High for wildfire risk?

4 of 58 scored California counties are rated "Very High" for wildfire risk by FEMA's National Risk Index.

What causes wildfire risk in California?

Wildfire risk reflects expected annual losses to buildings, population, and agriculture from wildfire, adjusted for social vulnerability and community resilience. High scores cluster in the western US, where dry climate, fuel loads, and seasonal wind patterns combine with rapid suburban development into fire-prone terrain.