How do I check the wildfire risk for a house?
Start with the national community-scale wildfire risk maps to see how the area around the house compares with the rest of the county and the country, then check whether the state or county has drawn a regulatory fire hazard zone that includes the property. The national maps describe a neighbourhood's long-term likelihood and intensity; the regulatory zone decides which building and defensible-space rules apply. Neither is an assessment of the house itself.
Reviewed by Spatia's editor on 2026-09-30; sources checked 2026-09-30.
The mistake almost everyone makes
Reading a moderate or low score as a house that will not burn. The national risk maps are modelled on a coarse grid from fuel, weather and topography and are published to help communities plan; they say nothing about the roof material, the vents, the vegetation within a few feet of the wall or the single access road, which are the things that decide whether a particular house survives a fire that reaches its street. And the maps show long-term likelihood rather than current conditions. A high score is a reason to inspect the house and its surroundings; a low score is not a reason to skip that.
How to check it
Read the community-scale risk first
The Forest Service's Wildfire Risk to Communities publishes wildfire likelihood, risk to homes and exposure type for every community and county, with percentiles against the state and the nation. Read the percentile, not the colour, and read the publication date: the maps are a modelled snapshot, updated in 2024, not a live condition.
Check for a regulatory hazard zone
Some states map fire hazard severity zones that carry legal consequences: in California the zone drawn by the state fire marshal triggers construction standards and defensible-space requirements, and must be disclosed on sale. Ask the local fire authority which zone, if any, the property is in. Where no state or county has drawn one, that is a statement about regulation, not about hazard.
Look at the house, not just the map
Fire reaches a house through its roof, its vents, its deck and whatever is growing within a few feet of its walls. Walk the property with those in mind, count the ways out, and ask whether the road in is wide enough for a fire engine going in while you are going out. The local fire department will usually say what it wants to see.
Ask what insurance will cost, and whether it is offered
In the highest-risk areas the private market has thinned and a state-backed plan of last resort may be the only offer. Get a written quote before the inspection contingency ends, and ask the seller what they pay now and whether they have been non-renewed.
Use FEMA's National Risk Index for context, not for the house
The index rates wildfire alongside seventeen other hazards at the census-tract and county level, as expected annual loss relative to the rest of the country. It is a comparison tool for a community; it does not describe a parcel, and a tract's score says nothing about which side of the tract the house is on.
What this still does not tell you
- It does not describe the house: its roof, vents, siding and the vegetation against it decide more than the map does.
- It shows long-term modelled likelihood, never current fire weather or an active fire.
- It is not an insurance quote, and a low score does not mean coverage is offered or affordable.
- It is not a substitute for a site inspection by the local fire authority or a fire-safety professional, and it is not legal advice.
Who actually decides
- USDA Forest Service — Wildfire Risk to Communities (wildfirerisk.org), the community-scale risk maps and their stated limits
- Your state fire marshal or forestry agency — draws any regulatory fire hazard severity zone; in California, CAL FIRE's Office of the State Fire Marshal
- FEMA — National Risk Index