Wildfire risk in Trinity County: where it is highest, and why
Wildfire risk in Trinity County spans a wide range, from 46.1 in the lowest-scored places to 85.2 in the highest, with a county median of 72.2. For a homeowner or buyer, that means risk can shift a lot from one area to another.
Trinity 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 Trinity County scores High or worse
We scored 155 points across Trinity County on the same 0–100 scale a Satelife address report uses, and they do not land in one place. 40% of them come out Very High, while 2% are Moderate. Which end your own parcel sits at is not something a county map can tell you.
40%
58%
Very High40% · 62 of 155 pointsHigh58% · 90 of 155 pointsModerate2% · 3 of 155 points
Safest end we measured46.1near Ruth · Moderate
Middle of the county72.2High — half of Trinity County is above this
Most exposed end we measured85.2near Weaverville · Very High
And the federal models agree it is a fire county
Relatively HighFEMA National Risk Index — wildfire risk rating · index score 98.5 / 100
$13.0M / yrFEMA NRI — expected annual loss from wildfire · rated Relatively High
2.02%USFS Wildfire Risk to Communities — mean annual burn probability · 90th-percentile cell 5.37%
6.66 ftUSFS WRC — mean conditional flame length · 99% of the county carries burnable fuel
FEMA NRI also rates Trinity County: all-hazards risk Relatively Low · social vulnerability Very High · community resilience Relatively Low · annualised wildfire frequency 0.0257.
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 Trinity 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 Trinity County
Most scored locations fall in the High tier: 90 points were High, 62 were Very High, and 3 were Moderate. There were no Low-tier points in the places we scored.
FEMA’s National Risk Index rates Trinity County’s wildfire risk as “Relatively High,” and its expected annual wildfire loss as “Relatively High.”
Fire record
Where the fires actually were
Since 1984, 1,493,382 acres have burned in Trinity County, which is 73.2% of the county.
There have been 265 recorded fire perimeters since 1984.
The largest fire listed is Hopkins (2020), at 328,363 acres. The most recent large fire is Deep (2023).
Monument Fire, 2021 — Trinity County.
Photo: Credit: USFS, via Public Information Officer, Shasta-Trinity National Forest, U.S. Forest Service, 3644 Avtech Parkway
Redding, CA 96002 · Public domain
265mapped fire perimeters centred in the county since 1984
1,493,382acres inside those perimeters since 1984
73.2%of the county's area, as a share of 8,261.3 km²
Deep 2023most 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
Hopkins Fire2020328,363 acres
Monument Fire2021223,172 acres
Red Fire2020143,887 acres
Haypress (River Complex) Fire2021193,402 acres in totalcrossed into the county
Doe Fire2020589,835 acres in totalcrossed into the county
Happy Fire201568,095 acres
Bake-Oven Fire200665,050 acres
Campbell Fire202230,133 acres
Perimeter sources: NIFC Interagency Fire Perimeter History · WFIGS Interagency Perimeters · largest on record: Hopkins 2020.
Perimeters are simplified for display; acreage is the figure the source records.
Communities
Where in the county you are matters most
Among named communities, Hayfork scores 76.1 and Trinity Village scores 75.4, both toward the higher end of county results. Weaverville is lower at 71.5, but still in a high-risk part of the county range.
Lewiston is 68.4, and Ruth is 60.9, making Ruth the lowest-scored named community in this set. These differences are why neighborhood-level lookups matter inside Trinity County.
Hayforkvillage · 2,368 people
76.1 Very High
Trinity Villagevillage · 297 people
75.4 Very High
Weavervilletown · 3,600 people
71.5 High
Lewistonvillage · 1,481 people
68.4 High
Ruthvillage · 195 people
60.9 High
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
Fire weather was not measured at all for Trinity County in the places we scored.
What was measured shows terrain pressure in many locations: terrain runs from 40 near Ruth to 65 in Ruth.
Vegetation and fuels range from 20 in Weaverville to 80 in unincorporated Trinity County, with a median of 71.2.
Fire weather was not measured at the sampled points in Trinity County. The other four
indicators on this page were, and the bars below show what they found.
What drives it
Which part of the risk moves, and which doesn't
Risk is not uniform inside Trinity County. The lowest scored place is Ruth at 46.1, while the highest scored place is near Weaverville at 85.2.
Hazard-zone scores also vary sharply, from 24 in Ruth up to 97.6 near Hayfork, with a median of 85.8.
Fire-history scores are high in many places: 5 in Weaverville at the low end, 95 near Ruth at the high end, and a median of 90.
Each bar is what one part of the score covers across Trinity 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
40–65highest near Ruth
Vegetation & fuels
20–80highest near unincorporated Trinity County
Hazard zone
24–97.6highest near Hayfork
Fire history
5–95highest near Ruth
Overall score
46.1–85.2highest near Weaverville
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
40
65
65
near Ruth
Ruth
155
Vegetation & fuels
20
71.2
80
Weaverville
unincorporated Trinity County
155
Hazard zone
24
85.8
97.6
Ruth
near Hayfork
155
Fire history
5
90
95
Weaverville
near Ruth
155
Composite
46.1
72.2
85.2
Ruth
near Weaverville
155
Independently of Satelife's layers, the USFS Wildfire Risk to Communities grid puts the county's mean annual burn probability at 2.02% (90th percentile cell: 5.37%), with a mean conditional flame length of 6.66 ft. 99% of the 21,624 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 111 of the 155 sampled points — the zones cover Local Responsibility Areas, and most of this county is state or federal land. At 111 of them the USFS grid above supplied the hazard reading instead.
155 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 90%. Scores are 0–100 and comparable within the county, not across states.
For a property
What a county range means for one address
For modeled burn likelihood, the USFS Wildfire Risk to Communities product shows a mean annual burn probability of 2.02%, and 5.37% at the 90th-percentile cell. It also indicates 99% of Trinity County can burn.
That same USFS product reports a mean conditional flame length of 6.66 feet, which contributes to property-level exposure where fuels and terrain are already elevated.
For county-wide context, FEMA’s National Risk Index rates Trinity County’s wildfire risk as “Relatively High,” while FEMA rates overall all-hazards risk as “Relatively Low.” FEMA also rates social vulnerability as “Very High” and community resilience as “Relatively Low.”
Across 155 sampled points in Trinity County, the score runs from
46.1 to 85.2 — 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 Trinity 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 Trinity County
Every one of the 30 ZIP areas that touch Trinity 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 Trinity County wildfire risk
What wildfire tier is most common in Trinity County?
High is the most common tier in the scored locations, with 90 points in High. Very High is also common, with 62 points.
How much of Trinity County has burned since 1984?
73.2% of the county has burned since 1984, totaling 1,493,382 acres.
What are the largest and most recent large fires I should know by name?
The largest fire listed is Hopkins (2020), at 328,363 acres. The most recent large fire is Deep (2023).
Was fire weather measured for Trinity County here?
No. Fire weather was not measured at all in the places we scored for Trinity County. The county results here do include terrain, vegetation and fuels, hazard-zone, and fire-history risk patterns.
This page is generated from a Trinity County data pack assembled on 2026-08-18 (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.
