Parcels · Hazard layers · Wildfire · October 16, 2026

Wildfire Risk Map: Check a Property's Fire Hazard Zone

How to use a wildfire risk map to check a parcel: national risk tools, state fire hazard zones, county GIS layers, and what the ratings do and don't mean.

A wildfire risk map shades the land by how likely it is to burn and how much harm a fire there could do. Buyers use one to size up a rural lot or a house on a wooded hillside, owners use it to plan brush clearing, and in some states the official fire hazard map also decides building rules and what a seller has to disclose. The catch is that “wildfire risk map” covers several very different products, from a national model built for whole communities to a state map drawn zone by zone. This guide explains the main kinds, how to check a single parcel, how to read what you find, and where the map stops being useful.

The main kinds of wildfire maps

National risk models. The USDA Forest Service’s free Wildfire Risk to Communities site maps wildfire likelihood and risk to homes for the whole country and lets you search a community, county or state. It rates places as low, medium, high or very high based on national percentiles. FEMA’s National Risk Index also includes wildfire among its hazards and shows ratings by county and census tract.
State hazard zone maps. Some states draw official zones. California’s Office of the State Fire Marshal classifies land into Moderate, High and Very High Fire Hazard Severity Zones, and those zones are tied to state building and defensible space rules. Other states publish wildfire risk viewers for planning without legal zones attached.
County and city layers. Many county GIS viewers carry a wildland-urban interface, fire district or local hazard layer you can switch on over the parcel lines. These are often the most detailed view of your own street.
Active fire maps. Live incident and smoke maps show fires burning now. They are a different tool and say nothing about long-term risk.

How to check a property on a wildfire risk map

Pin down the parcel. Find the parcel on the county assessor or GIS site and note its parcel number; our guide on finding a parcel number by address walks through it. For rural land, use the parcel’s location on the map, not a mailing address that may point to a post office.
Start with the official layer. If your state has an official fire hazard zone map, look the parcel up there first, because that is the map tied to rules. In California, search the address in the state’s fire hazard severity zone viewer, which shows both state and local responsibility areas.
Add the national view. Search the community or county on Wildfire Risk to Communities to see how the wider area compares with the rest of the country.
Check the county viewer. Turn on any fire, wildland-urban interface or fire district layer in the county GIS, along with aerial imagery. Our land map links you to county viewers.
Look at the ground around the lot. Use aerial photos and a topographic map of the property to see the slope, the fuel nearby and which way the land faces. Fire runs fastest uphill, and a lot at the top of a brushy slope faces more exposure than the map shading alone may suggest.

How to read what you find

Likelihood and risk are not the same. Wildfire likelihood is about how often an area tends to burn. Risk to homes adds how intense a fire could be and whether homes are there to be harmed.
A rating is a comparison. National percentile ratings compare a place with the rest of the country. “High” means higher than most places, not that a fire is expected next year.
Resolution matters. The Forest Service notes its national data are not locally calibrated and work best for a whole community, not a single house. Use it for context and lean on state or county maps for the parcel itself.
Data have a vintage. Models are built from vegetation and fuel data for a certain year. A recent fire, new clearing or new building nearby will not show until the next update.
Zone lines are generalized. If a parcel sits on or near a zone line, zoom in, check the parcel’s own location and ask the local fire or planning office which side it falls on.

Why the zone can matter for a property

Building rules. In mapped high-hazard zones, new homes and additions may need ignition-resistant roofs, vents, siding and decks.
Defensible space. Some states and counties require owners to clear and thin vegetation within set distances of buildings in mapped zones.
Disclosure. In California, a seller has to tell a buyer when a property lies in a Very High Fire Hazard Severity Zone or a state responsibility area. Other states have their own disclosure rules or none at all.
Insurance. Insurers use their own wildfire scoring, which may not match any public map. Ask about coverage early when you look at land in a fire-prone area.
Maps change. California adopted new state responsibility area zones in 2024 and released recommended local zone maps in 2025 for cities and counties to adopt. Oregon’s legislature repealed its statewide wildfire hazard map in 2025. Always check the current version and its effective date.

Other layers to check while you are on the map

A wildfire layer is one piece of a hazard check. The same county viewer can usually show the flood zone, so check the flood zone by address too, along with wetlands, zoning and whether the parcel is inside city limits, which can change who provides fire protection. If you are clearing brush to create defensible space, Dumpmapper’s guide to where to take yard waste and brush shows the usual drop-off options.

What a wildfire map cannot tell you

Whether a specific house will burn. Building materials, roof condition, vents and the brush right around the house often matter more than the zone color.
Where to evacuate. Follow local emergency managers and active fire alerts for that.
What insurance will cost or whether a policy is available.
Where the parcel lines are. A hazard map is not a survey; see our guide to reading a property survey.

Quick checklist

Find the parcel and its true location on the county viewer.
Check the official state or local fire hazard zone map, if one exists.
Compare with a national risk map for the wider area.
Look at slope, nearby fuel and aerial imagery.
Ask the local fire or building office which rules apply to that lot.

Questions people ask

How do I find the wildfire risk for my address?

Start with your state's official fire hazard map if it has one, then search your community on the USDA Forest Service's Wildfire Risk to Communities site and check any fire layer in the county GIS viewer.

Is my property in a fire hazard zone?

Only an official state or local map can say that. In California, search the address in the state fire hazard severity zone viewer. Elsewhere, ask the county planning or fire office whether a mapped zone applies.

What is the difference between wildfire likelihood and wildfire risk?

Likelihood describes how often an area tends to burn. Risk also weighs how intense a fire could be and whether homes or other things of value are there to be harmed.

Are national wildfire risk maps accurate for one house?

Not at that scale. The national data are meant for comparing communities and are not locally calibrated. Use state and county maps and the ground around the lot for a single parcel.

Does a fire hazard zone affect buying a home?

It can. Mapped zones may bring building rules, brush-clearing requirements and seller disclosures, and insurers use their own wildfire scores. Check all of these before you buy.

How often do wildfire maps change?

Official zone maps are revised every few years, and national models are updated as new fuel data come in. Always check the version and effective date of the map you use.