Sonoma County Fire Hazard Severity Zone (FHSZ) and insurance
CAL FIRE wildfire hazard for Sonoma County, California, how physical hazard differs from an insurer's risk assessment, and your home coverage options.
| Wildfire hazard (CAL FIRE FHSZ) | High |
|---|---|
| Earthquake exposure | High |
| Flood exposure | Yes |
| Coastal exposure | Yes |
| Wind-driven fire risk | No |
| Region | Bay Area |
| County seat | Santa Rosa |
This is a qualitative county-level overview derived from CAL FIRE wildfire hazard data and companion perils, not a parcel-level score. Check a specific address on the CAL FIRE viewer linked below.
Hazard is not the same as your insurance risk
A Fire Hazard Severity Zone measures long-term physical wildfire hazard to guide building codes and defensible-space rules. It is not an insurer's underwriting score, and the California Department of Insurance has stated that CAL FIRE's maps do not by themselves determine insurance rates or availability. Carriers weigh your roof, your defensible space, your access and water supply, and their own catastrophe models - so a zone designation and a carrier's decision can and do diverge.
We explain that gap in full, including what the 2025 statewide map update changed and why most homes destroyed in the Eaton Fire sat outside the mapped very-high zone, on our California Fire Hazard Severity Zone guide. You can look up any Sonoma County address on the official CAL FIRE zone viewer.
Wildfire and home insurance in Sonoma County
Wildfire is often the deciding factor in whether a home can be insured in Sonoma County. When carriers decline or non-renew here, we turn to surplus lines wildfire markets and California FAIR Plan coverage paired with a difference-in-conditions wrap for broader protection.
Sonoma County sits in a seismically active area, and because standard home policies exclude earthquakes, separate earthquake coverage is worth considering.
Flooding is a real consideration in Sonoma County, and since standard home policies exclude flood, separate flood coverage may be needed for exposed properties.
Coastal areas of Sonoma County add wind, storm, and flood considerations for properties near the shore.
Wine country repeatedly devastated by the 2017 Tubbs and later Kincade fires, including neighborhoods within Santa Rosa. It is one of the toughest admitted-market home counties in California.
Major recent wildfires in Sonoma County
These are among the most significant wildfires CAL FIRE has recorded in Sonoma County. They are why parts of the county are mapped at High or Very High hazard - and why some homes here are hard to place in the standard market.
| Fire | Year | Acres | Structures destroyed |
|---|---|---|---|
| Kincade Fire - the largest wildfire in Sonoma County history by acreage | 2019 | 77,758 | 374 |
| Tubbs Fire * - Napa and Sonoma counties; 22 deaths, and leveled much of Santa Rosa | 2017 | 36,807 | 5,636 |
| Nuns Fire - part of the October 2017 North Bay firestorm | 2017 | 54,382 | 1,355 |
* Incident total spans more than Sonoma County. Acres burned and structures destroyed are CAL FIRE incident totals.
The county's steepest hazard falls on the Mayacamas and Sonoma mountains, the Highway 12 corridor, the Fountaingrove hills ringing Santa Rosa, and the rural interface around Healdsburg, Geyserville, and Glen Ellen.
CAL FIRE incident activity in Sonoma County
Between 2015 and 2026, CAL FIRE recorded 30 tracked incidents listing Sonoma County. That is a moderate level of recorded activity for a California county.
The largest tracked incident touching Sonoma County was the LNU Lightning Complex in 2020. It burned 363,220 acres in total, though that figure spans every county the fire reached, not Sonoma County alone.
| Year | Incidents |
|---|---|
| 2016 | 1 |
| 2017 | 10 |
| 2018 | 1 |
| 2019 | 1 |
| 2020 | 4 |
| 2021 | 2 |
| 2022 | 2 |
| 2024 | 8 |
| 2026 | 1 |
Source: CAL FIRE incident record, 2015-2026. These are incidents CAL FIRE responded to or monitored, not every ignition in California, so treat the count as a measure of significant fire activity rather than a complete tally. Acreage attributed to the county excludes multi-county complexes, because CAL FIRE reports acres per incident rather than per county.
FAIR Plan reliance in Sonoma County
The California FAIR Plan is the state's insurer of last resort - basic fire coverage for homes the standard market will not write. Its policy count is a direct gauge of how hard a county has become to insure.
California FAIR Plan policies in force (residential, commercial, and business owner lines), by county, as of September 2024. Source: California FAIR Plan.
A rising FAIR Plan count does not mean bare-bones coverage is your only option. As an independent broker we still check the admitted and surplus lines markets first, and when the FAIR Plan is the right base we pair it with a difference-in-conditions policy for the theft, liability, and water damage it excludes.
Coverage options in Sonoma County
- Wildfire and hard-to-insure home coverage
- California FAIR Plan plus difference-in-conditions
- Standard homeowners, condo, and renters coverage
Sources
- CAL FIRE Office of the State Fire Marshal - Fire Hazard Severity Zones
- CAL FIRE Fire Hazard Severity Zone Viewer (official address lookup)
- CAL FIRE - Top 20 Largest and Most Destructive California Wildfires; Incident Archive
- California FAIR Plan - policies in force by county (as of 9/30/2024)
- California Department of Insurance
- California FAIR Plan Association
Sonoma County FHSZ FAQ
Is Sonoma County in a Fire Hazard Severity Zone?
Yes. CAL FIRE maps significant portions of Sonoma County as High or Very High Fire Hazard Severity Zones, especially in the wildland-urban interface.
What was the worst wildfire in Sonoma County?
The most destructive recent wildfire in Sonoma County was the 2017 Tubbs Fire, which leveled the Coffey Park and Fountaingrove neighborhoods of Santa Rosa. CAL FIRE incident records list its acreage and the number of structures destroyed alongside the county's other major fires.
Does a Fire Hazard Severity Zone set my insurance rate in Sonoma County?
No. A CAL FIRE zone classifies long-term physical wildfire hazard for planning and building rules, not insurance pricing, and the California Department of Insurance has stated the maps do not by themselves determine rates or availability. Carriers price each Sonoma County property on its own roof, defensible space, access, and their own catastrophe models.
Can I still get homeowners insurance in Sonoma County?
Yes. As an independent broker we shop admitted carriers writing Sonoma County, then surplus lines wildfire markets and the California FAIR Plan paired with a difference-in-conditions wrap when a home is hard to place in the standard market.
How many wildfires does Sonoma County get?
CAL FIRE recorded 30 tracked incidents listing Sonoma County between 2015 and 2026, with its busiest year being 2017. That covers the fires CAL FIRE responded to or monitored rather than every ignition, so read it as a measure of significant activity.
What was the largest wildfire in Sonoma County?
The largest tracked incident touching Sonoma County was the LNU Lightning Complex in 2020, at 363,220 acres. That fire crossed county lines, so the acreage covers every county it reached, not Sonoma County alone.
How many California FAIR Plan policies are in Sonoma County?
As of September 2024, Sonoma County had 6,304 California FAIR Plan policies in force across all lines, up from 956 in 2020 - a sign of how far the standard market has pulled back. The FAIR Plan is the insurer of last resort; a broker can still check admitted and surplus lines options first.
Does the California FAIR Plan cover Sonoma County?
Yes. The California FAIR Plan is available statewide, including Sonoma County, as a last-resort option for fire coverage when the standard market declines. It is typically paired with a difference-in-conditions policy for the theft, liability, and water damage the FAIR Plan does not include.
Insuring a home in Sonoma County?
Tell us what you need and a licensed California broker will reach out with real options. Simple situation or complicated one, we shop it the same way.
Prefer to talk? Call (916) 469-5253.