Wildfire risk in Glenn County: where it is highest, and why
Wildfire risk in Glenn County spans a wide range across the places we scored. Scores run from 18.5 in Willows to 78.6 near Willows, with a county midpoint of 47.4.
Glenn County — the largest fires on record, at their perimeter centres, with the county’s main communities. Select a marker for its detail.
At a glance
Half of Glenn County scores Moderate or worse
We scored 153 points across Glenn County on the same 0–100 scale a Satelife address report uses, and they do not land in one place. 1% of them come out Very High, while 22% are Low. Which end your own parcel sits at is not something a county map can tell you.
45%
31%
22%
Very High1% · 2 of 153 pointsHigh45% · 69 of 153 pointsModerate31% · 48 of 153 pointsLow22% · 34 of 153 points
Safest end we measured18.5near Willows · Low
Middle of the county47.4Moderate — half of Glenn County is above this
Most exposed end we measured78.6near Willows · Very High
And the federal models agree it is a fire county
Relatively ModerateFEMA National Risk Index — wildfire risk rating · index score 91.8 / 100
$2.2M / yrFEMA NRI — expected annual loss from wildfire · rated Relatively Moderate
1.43%USFS Wildfire Risk to Communities — mean annual burn probability · 90th-percentile cell 3.65%
4.19 ftUSFS WRC — mean conditional flame length · 91% of the county carries burnable fuel
FEMA NRI also rates Glenn County: all-hazards risk Relatively Low · social vulnerability Very Low · community resilience Very Low · annualised wildfire frequency 0.0042.
Sources: FEMA National Risk Index 1.20.0 (Dec 2025), county record · USFS Wildfire Risk to Communities v2.0, mean of the grid cells inside the county. Both describe the county as a whole, never an address in it.
What does your Glenn County address score?
A county range shows the spread. Your parcel sits somewhere inside it — the report says where, and what to do about it.
Free to request · PDF report with a 0–100 score, the drivers behind it, and a mitigation plan
Local context
What the data says about Glenn County
Looking at the four risk tiers used in address reports, the largest count of scored points is in the High tier (69 points). The rest are spread across Moderate (48), Low (34), and a small number in Very High (2).
Fire record
Where the fires actually were
Since 1984, 54,775 acres have burned in Glenn County, and 6.5% of the county has burned in that period. The county record here includes 51 fire perimeters since 1984.
The largest fire named for Glenn County in this summary is Trough (2001), at 24,927 acres. The most recent large fire is Corbin (2020), at 6,061 acres.
Two very large fires also affected the county in part: Doe (2020) at 589,835 acres and Ranch (2018) at 410,202 acres.
Ranch Fire, 2018 — Glenn County.
Photo: MODIS Land Rapid Response Team, NASA GSFC · Public domainTrough Fire, 2001 — Glenn County.
Photo: Astronaut photographs STS105-E-5421, STS105-E-5416, and STS105-E-5417 were taken from the Space Shuttle on August 20, 2001, and were provided by the Earth Scien · Public domain
51mapped fire perimeters centred in the county since 1984
54,775acres inside those perimeters since 1984
6.5%of the county's area, as a share of 3,416.5 km²
Corbin 2020most recent large fire on record
Before 20002000s2010s2020s
Fire perimeters coloured by decade. Select a perimeter for its name, year and size.
Named fires on record
Doe Fire2020589,835 acres in totalcrossed into the county
Ranch Fire2018410,202 acres in totalcrossed into the county
Grindstone Fire192239,806 acres
Trough Fire200124,927 acres
Corbin Fire20206,061 acres
Spanish Fire20036,050 acres
Squaw Ridge Fire19796,861 acres
Logan Fire19616,707 acres
Perimeter sources: NIFC Interagency Fire Perimeter History · WFIGS Interagency Perimeters · largest on record: Trough 2001.
Perimeters are simplified for display; acreage is the figure the source records.
Communities
Where in the county you are matters most
Among the named communities here, Willows (23.6) and Orland (23.5) are very similar on their typical score, while Hamilton City is higher at 29.0.
All three community medians are below the county midpoint score of 47.4, which shows that higher-risk locations in Glenn County are concentrated outside these town and village centers in the places scored.
Hamilton Cityvillage
29 Moderate
Willowstown · 6,072 people
23.6 Low
Orlandtown
23.5 Low
The score is the median of the sampled points nearest that community — a community-scale
indicator, not a score for any individual property in it. Population comes from the
community's own record where the source carries one.
Terrain & fuels
Terrain, vegetation and fuels
Terrain-related risk ranges from 20.0 near Willows to 65.0 in unincorporated Glenn County, with a midpoint of 40.0. That spread shows meaningful topographic differences across the county.
Vegetation and fuels show an even wider spread, from 5.0 near Orland to 80.0 near Willows, with a midpoint of 55.0. In practical terms, fuel conditions contribute very differently depending on where you are.
40median terrain score (max 65 near unincorporated Glenn County)
55median vegetation & fuels score (max 80 near Willows)
Fire weather
Fire weather across Glenn County
Fire-weather scores are elevated across the county, ranging from 55.3 in unincorporated Glenn County to 73.5 near Willows. The midpoint is 64.5, so weather-related exposure is a major part of the county’s wildfire risk profile.
A separate countywide burn-probability model reports a mean annual burn probability of 1.43% and a 90th-percentile cell value of 3.65%. That model is not a fire-weather measure; it is a modeled burn-probability product.
55.3lowest fire-weather score — near unincorporated Glenn County
73.5highest fire-weather score — near Willows
What drives it
Which part of the risk moves, and which doesn't
Risk is not uniform from one part of the county to another. The lowest and highest overall scores are both tied to the Willows area, from 18.5 in Willows up to 78.6 near Willows.
Past-fire and mapped-hazard patterns also vary sharply by location. Fire history scores run from 5.0 to 95.0 (both near Willows), while hazard-zone scores run from 10.0 near Willows up to 97.4 near Orland.
Each bar is what one part of the score covers across Glenn County, on the same 0–100 scale.
A long bar is a part of the risk that depends on where you are; a short one is the same
almost everywhere.
Terrain
20–65highest near unincorporated Glenn County
Vegetation & fuels
5–80highest near Willows
Hazard zone
10–97.4highest near Orland
Fire history
5–95highest near Willows
Fire weather
55.3–73.5highest near Willows
Overall score
18.5–78.6highest near Willows
The tick on each bar is the middle value. Tier boundaries — Moderate at 25, High at 50,
Very High at 75 — are the faint lines behind them.
Show every number behind these bars
Layer
Min
Median
Max
Lowest place
Highest place
Points
Terrain
20
40
65
near Willows
unincorporated Glenn County
153
Vegetation & fuels
5
55
80
near Orland
near Willows
153
Hazard zone
10
63.6
97.4
near Willows
near Orland
153
Fire history
5
20
95
near Willows
near Willows
153
Fire weather
55.3
64.5
73.5
unincorporated Glenn County
near Willows
153
Composite
18.5
47.4
78.6
Willows
near Willows
153
Independently of Satelife's layers, the USFS Wildfire Risk to Communities grid puts the county's mean annual burn probability at 1.43% (90th percentile cell: 3.65%), with a mean conditional flame length of 4.19 ft. 91% of the 31,938 grid cells inside the county carry burnable fuel at all.
Source: USFS Wildfire Risk to Communities v2.0 (ImageServer, county extent).
CAL FIRE has no mapped Fire Hazard Severity Zone at 40 of the 153 sampled points — the zones cover Local Responsibility Areas. At 40 of them the USFS grid above supplied the hazard reading instead.
153 sample points on a ~2.3 km grid, plus one at the centre of each community, weighted with the Satelife county profile v1 · median layer coverage 100%. Scores are 0–100 and comparable within the county, not across states.
For a property
What a county range means for one address
FEMA’s National Risk Index rates Glenn County’s wildfire risk as Relatively Moderate, and its expected annual loss from wildfire as Relatively Moderate. FEMA rates the county’s all-hazards risk as Relatively Low.
This county summary does not measure parcel-by-parcel building features, so property-specific construction and defensible-space conditions were not measured here. What is included is county-scale wildfire context, including that 90.8% of the county is in areas that can burn in the modeled burn-probability product.
Across 153 sampled points in Glenn County, the score runs from
18.5 to 78.6 — two neighbouring parcels can sit in different tiers.
A county number is the middle of that spread; it says nothing about which end yours is at.
Find out where your Glenn County parcel sits
Slope, the fuel touching the structure, the road out, the fire history within a mile — measured at your address, not averaged across the county.
Free to request · PDF report with a 0–100 score, the drivers behind it, and a mitigation plan
Coverage
ZIP codes we cover in Glenn County
Every one of the 18 ZIP areas that touch Glenn County — we run address-level
reports in all of them. They are grouped by the median score of the points we sampled inside
each, which is a neighbourhood-scale indicator and not a score for any
property: two homes in the same ZIP routinely land in different tiers.
Frequently asked questions about Glenn County wildfire risk
What is the biggest fire listed for Glenn County?
In this summary, the largest named fire for Glenn County is Trough (2001), which burned 24,927 acres.
What is the most recent large fire in this county summary?
The most recent large fire is Corbin (2020), at 6,061 acres.
How much of Glenn County has burned since 1984?
54,775 acres have burned since 1984, which equals 6.5% of the county.
Are wildfire scores the same in Willows, Orland, and Hamilton City?
No. Willows and Orland are close (23.6 and 23.5), while Hamilton City is higher at 29.0.
Is FEMA’s rating a town-by-town score?
No. FEMA’s National Risk Index ratings here apply to Glenn County as a whole, not to individual places inside the county.
This page is generated from a Glenn County data pack assembled on 2026-08-19 (pack v1.0). Scores are sampled across the
county, not measured at any individual address, and are informational decision support — not a
substitute for official evacuation orders, a fire-agency hazard determination, or an insurer's
underwriting judgement.
Data versions: fema_nri 1.20.0 (Dec 2025) · landfire per adapter · nifc_history All Years View · wfigs current · wrc v2.0 (2024) · zcta Census 2020.
What does your parcel look like, layer by layer?
A county range shows the spread. An address-level Satelife report shows where in that spread your property actually sits — PDF, per-layer score, and a prioritized mitigation plan.
