California wildfire risk

California's recorded fire history

Federal perimeter records list 10,012 mapped wildfires in California since 2000. The largest on that record is the Biscuit Fire of 2002, which burned 501,082 acres.

Recorded history feeds directly into your address score: our model counts mapped burns within 25 miles of a parcel, weighted toward large ones. It is worth knowing the limitation, though — a long record of successful suppression can leave an area reading quiet while fuel accumulates, which is precisely the condition that produces the next large fire.

Where hazard concentrates in California

Wildfire hazard is not spread evenly across a state. These are the 5 counties in California with the highest wildfire risk scores in FEMA's National Risk Index, with the building value each has sitting in exposed areas.

San Diego County carries the highest score in the state at 100.0. If your address is there, or in any of the counties above, the statewide average understates your situation considerably — which is the reason to check the parcel rather than the state.

How California ranks nationally

FEMA's National Risk Index scores every US county for expected annual wildfire loss. Across California's 58 assessed counties the average wildfire hazard score is 94.2, which places the state 1st of the 50 states. The most exposed county in California scores 100.0.

Against a 50-state average of 52.7, California sits 41.5 points above it. Rank 1 of 50. The National Risk Index blends how often wildfire is expected with how much is standing in the way, so a state can post a moderate score with severe local hazard wherever development has pushed into the wildland-urban interface.

Roughly $504.1B of building value sits inside California's wildfire-exposed areas. That figure is what drives carrier behaviour: insurers manage concentration of exposure, so a state can have modest average hazard and still see availability problems wherever that value clusters in the wildland-urban interface.

California wildfire season

California no longer has a season so much as a year with variable intensity. The traditional summer-autumn peak still carries the largest fires, driven by offshore wind events in the autumn, but significant fires now occur in every month.

Insurance in California

California is the most stressed homeowners insurance market in the country for fire risk. Admitted carriers have restricted new business in high-hazard areas, and the FAIR Plan has grown accordingly. Because a FAIR Plan policy covers fire and smoke only, the standard arrangement is to pair it with a difference-in-conditions policy for liability, theft and water damage. California also requires admitted insurers to recognise wildfire mitigation in rating under the Safer from Wildfires framework.

Residual-market availability and the rules governing it change. Confirm the current position with the California Department of Insurance before you rely on it.

Whatever the market looks like in your area, the sequence is the same: document mitigation before your renewal date, work with an independent broker who can access surplus lines, and ask directly whether the carrier credits wildfire mitigation. The full fire insurance guide covers non-renewal, FAIR Plans and difference-in-conditions wraps in detail.

Lowering your risk in California

The two changes with the best return anywhere in the country are clearing the first five feet around the structure to non-combustible material, and screening vents against ember entry. Both are cheap, both address the mechanism that destroys most homes, and both are visible to an underwriter if you photograph and invoice them. What qualifies and how to document it.