Guide
Wildfire Home Protection, Defensible Space, Vents & Materials
Wildfires have become more frequent and intense due to climate change, drought, and the expansion of development into the wildland-urban interface (WUI). Over 40 million US homes are now at risk. Research from the Insurance Institute for Business & Home Safety (IBHS) and USFS shows that homes can be made significantly more survivable through targeted hardening and landscaping measures.
Leading causes of US home fires
Share of residential fires by cause
- Cooking
Cooking
49 % of fires
- Heating Equipment 15
Heating Equipment
15 % of fires
- Vehicle Fires 14
Vehicle Fires
14 % of fires
- Electrical & Lighting 9
Electrical & Lighting
9 % of fires
- Intentional (Arson) 8
Intentional (Arson)
8 % of fires
- Smoking Materials 6
Smoking Materials
6 % of fires
- Wildland & Brush 5
Wildland & Brush
5 % of fires
- Candles 4
Candles
4 % of fires
What this shows Cooking is the leading cause, accounting for 49% of US home fires. Smoking materials cause a far larger share of deaths than fires, a reminder that the most common causes are not always the deadliest.
1. Defensible Space Zones
Defensible space creates a buffer that slows fire spread and gives firefighters a safer area to defend your home. Most states with wildfire risk require defensible space by law.
- ▸ Zone 1 (0-30 ft): Remove all dead plants and keep grass mowed to 4 inches or less. Space shrubs 10+ feet apart and trees 10+ feet from structures.
- ▸ Zone 2 (30-100 ft): Reduce fuels by thinning brush, trees, and tall grass. Remove ladder fuels (shrubs beneath trees).
- ▸ Zone 3 (100+ ft): Maintain whatever local regulations require; focus on eliminating ignition pathways to structure.
- ▸ Clear gutters, decks, and roof areas of dead leaves and debris weekly during fire season.
- ▸ Replace combustible fencing near the structure with metal or masonry.
2. Home Hardening, Vents and Openings
Most homes are ignited by embers entering through vents, gaps, and eaves, not by direct flame contact. Closing ember entry points is the highest-priority upgrade.
- ▸ Replace attic and eave vents with 1/16-inch metal mesh screens (not fiberglass or plastic)
- ▸ Install ember-resistant vents (CAL FIRE listed) in all roof and wall penetrations
- ▸ Seal any gaps in siding, around pipes, and under eaves
- ▸ Cover weep holes in brick with 1/16-inch mesh
- ▸ Install multi-pane tempered or fire-rated glass windows
3. Fire-Resistant Building Materials
Material choices for roofing, siding, and decking dramatically affect a home's ability to survive wildfire exposure.
- ▸ Roofing: Class A fire-rated shingles (asphalt, metal, clay, or concrete tile) - wood shake is highest risk
- ▸ Siding: Fiber cement, brick, stucco, or metal, avoid vinyl and wood
- ▸ Decking: Composite or non-combustible decking rather than wood
- ▸ Deck undersides: Enclose with fire-resistant material to prevent ember accumulation
- ▸ Fencing: Metal, masonry, or composite materials near the structure
4. Evacuation Planning
Even well-hardened homes can be lost in extreme conditions. Having an evacuation plan ready before fire season is critical.
- ▸ Sign up for local emergency alerts (Wireless Emergency Alerts + county notification systems)
- ▸ Prepare a go-bag with 72 hours of supplies, medications, documents, and irreplaceables
- ▸ Know at least two evacuation routes from your neighborhood
- ▸ Leave EARLY, don't wait for a mandatory evacuation order
- ▸ If you have animals or livestock, plan animal evacuation separately, they need more time
- ▸ Check your county or state forestry agency for local wildfire risk ratings and historical disaster declarations
Read our methodology - how this data is sourced, computed, and verified.
Related
Understanding the Data
The statistics in this guide come from the U.S. Fire Administration's National Fire Department Registry and the DHS/CISA HIFLD fire-station registry, along with FEMA's AFG/SAFER grant disclosures where noted. We standardize department names, station counts, and personnel figures across these sources so they can be compared consistently, but every number ultimately traces back to what the source agency reported.
These registries are self-reported by individual fire departments and updated on the agencies' own schedules, so coverage is not perfectly uniform: smaller or all-volunteer departments are more likely to have incomplete or dated entries, and a department that has not reported recently may show older figures than a department that reports every year. We flag missing fields rather than filling them in, and we note the data vintage wherever a figure could otherwise be misread as current.
For readers who want to go deeper, the source agencies publish their own documentation on collection methodology and known data-quality issues; our methodology page links directly to those sources so every figure here is auditable back to the original record.
