Trinity County, California

Wildfire risk in Trinity County: where it is highest, and why

Wildfire risk is elevated across much of Trinity County. Across the places we scored, the overall wildfire-risk score runs from 46.8 in Ruth to 82.1 near Weaverville, with a county middle value of 70.5.

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Before 20002000s2010s2020sCommunity

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. 30% 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.

30%

68%

Very High 30% · 47 of 155 points High 68% · 105 of 155 points Moderate 2% · 3 of 155 points

Safest end we measured 46.8 near Ruth · Moderate

Middle of the county 70.5 High — half of Trinity County is above this

Most exposed end we measured 82.1 near Weaverville · Very High

And the federal models agree it is a fire county

Relatively High FEMA National Risk Index — wildfire risk rating · index score 98.5 / 100

$13.0M / yr FEMA 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 ft USFS 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, with 105 places there. Another 47 places are in the Very High tier, and only 3 are in Moderate.

FEMA’s National Risk Index rates Trinity County’s wildfire risk as "Relatively High" and its wildfire expected annual loss as "Relatively High." In the same FEMA index, the county’s all-hazards risk is "Relatively Low."

Fire record

Where the fires actually were

Fire has been a major part of Trinity County’s recent history. Since 1984, 1,493,382 acres have burned within county fire perimeters, and 73.2% of the county has burned since 1984. The county record includes 265 fire perimeters over that period.

The largest fire named in the county summary is Hopkins (2020), at 328,363 acres. The most recent large fire is Deep (2023).

Other major named fires in this county record include Doe (2020), which was partly in Trinity County, and Monument (2021).

Monument Fire (2021) in Trinity County, California - A heavy lift helicopter lifts off after filling its tank with water on 8-17-21. — **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

265 mapped fire perimeters centred in the county since 1984

1,493,382 acres inside those perimeters since 1984

73.2% of the county's area, as a share of 8,261.3 km²

Deep 2023 most recent large fire on record

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 the communities listed here, Hayfork has a median wildfire-risk score of 73.9, Weaverville is 69.8, and Lewiston is 67.1.

Trinity Village is also high at 73.2, while Ruth is lower at 60.2. These local differences are why people often compare risk by town or nearby area, not just countywide.

Hayfork village · 2,368 people

73.9 High

Trinity Village village · 297 people

73.2 High

Weaverville town · 3,600 people

69.8 High

Lewiston village · 1,481 people

67.1 High

Ruth village · 195 people

60.2 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

Terrain contributes strongly to wildfire risk in Trinity County. Terrain scores are 40.0 near Ruth and 65.0 at Ruth, with a county middle of 65.0.

Vegetation and fuels vary more. This score is lowest in Weaverville at 20.0 and reaches 80.0 in unincorporated Trinity County, with a middle value of 71.2.

State hazard-zone scoring is also high in many places: 97.6 near Hayfork, 24.0 in Ruth, and a county middle of 85.8.

65 median terrain score (max 65 near Ruth)

71.2 median vegetation & fuels score (max 80 near unincorporated Trinity County)

Fire weather

Fire weather across Trinity County

Fire-weather exposure was measured across Trinity County, and it is fairly tight from place to place. Scores run from 52.7 near Trinity Village to 55.4 near Lewiston, with a county middle of 54.5.

Separate from fire-weather scoring, the USFS Wildfire Risk to Communities model reports a mean annual burn probability of 2.02% and a 90th-percentile cell value of 5.37%. It also indicates that 99% of the county can burn.

52.7 lowest fire-weather score — near Trinity Village

55.4 highest fire-weather score — near Lewiston

What drives it

Which part of the risk moves, and which doesn't

Risk is not uniform from one place to another. The highest overall wildfire-risk score we saw is 82.1 near Weaverville, while the lowest is 46.8 in Ruth; the county middle is 70.5.

At the community level, Hayfork has a median score of 73.9 and Trinity Village is 73.2, both on the higher side of local results. Lewiston’s median is 67.1.

Weaverville’s median is 69.8, while Ruth is lower at 60.2. That spread shows why neighborhood-level location matters inside the same county.

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

40–65 highest near Ruth

Vegetation & fuels

20–80 highest near unincorporated Trinity County

Hazard zone

24–97.6 highest near Hayfork

Fire history

5–95 highest near Ruth

Fire weather

52.7–55.4 highest near Lewiston

Overall score

46.8–82.1 highest 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
Fire weather	52.7	54.5	55.4	near Trinity Village	near Lewiston	155
Composite	46.8	70.5	82.1	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 100%. Scores are 0–100 and comparable within the county, not across states.

For a property

What a county range means for one address

For a homeowner or buyer, the county pattern points to mostly elevated local exposure: 105 scored places are in the High tier, 47 are in Very High, and 3 are in Moderate.

There are 0 scored places in the Low tier. Countywide, FEMA’s National Risk Index labels wildfire risk "Relatively High," alongside "Very High" social vulnerability and "Relatively Low" community resilience.

Across 155 sampled points in Trinity County, the score runs from 46.8 to 82.1 — 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.

Very High 4 ZIPs

High 10 ZIPs

No sampled point inside 16 ZIPs

95428 · 95454 · 95511 Ruth · 95542 · 95573 Trinity Village · 96014 · 96017 · 96025 · 96027 · 96031 · 96033 Lewiston · 96034 · 96047 Lewiston · 96051 · 96087 Lewiston · 96094

Grouped from 14 of 30 ZIP areas — the rest had no sample point fall inside them. The community shown is the nearest mapped place to the ZIP's centre.

ZIP areas are Census 2020 ZIP Code Tabulation Areas intersecting the county boundary.

Where to go next

Trinity County wildfire risk in context

California wildfire risk The statewide picture and every county page we publish Wildfire risk by state Every state and county we cover How Satelife calculates wildfire risk Data sources, layers, score composition, honest limits Create a wildfire evacuation plan Zones, egress routes, refuge areas Run a report for a Trinity County address PDF + score + mitigation plan

FAQ

Frequently asked questions about Trinity County wildfire risk

How much of Trinity County has burned in recent decades?

Since 1984, 1,493,382 acres have burned within county fire perimeters, which is 73.2% of the county.

What are the key recent fire names to know?

The largest fire named in the county summary is Hopkins (2020). The most recent large fire is Deep (2023).

Is fire weather the same thing as burn probability?

No. Fire-weather scores here run from 52.7 to 55.4 across the county, while the USFS model reports burn probability as percentages, including 2.02% mean annual burn probability.

Do all Trinity County communities show similar wildfire risk levels?

No. In the listed communities, median scores range from 60.2 in Ruth to 73.9 in Hayfork, with Weaverville at 69.8 and Trinity Village at 73.2.