{
  "title": "Wildfire Risk in Tuolumne County, CA 2026 | Satelife",
  "description": "Wildfire risk in Tuolumne County varies a lot by location. In the places we scored, overall scores run from 37.1 in unincorporated Tuolumne County to 83.6 near Groveland, with a middle value of 68.1.",
  "image": "https://satelife.ai/images/wildfire-risk/tuolumne-county/generated/tuolumne-county-locator.webp",
  "canonical": "https://satelife.ai/wildfire-risk/california/tuolumne-county/",
  "content": "[Home](/)›[Wildfire Risk](/wildfire-risk/)›[California](/wildfire-risk/california/)›Tuolumne County\n\nTuolumne County, California\n\n# Wildfire risk in Tuolumne County: _where it is highest_, and why\n\nWildfire risk in Tuolumne County varies a lot by location. In the places we scored, overall scores run from 37.1 in unincorporated Tuolumne County to 83.6 near Groveland, with a middle value of 68.1.\n\n[Score my Tuolumne County address →](#score-my-address) [How risky is this county? ↓](#risk-at-a-glance)\n\nBefore 20002000s2010s2020sCommunity\n\nTuolumne County — the largest fires on record, at their perimeter centres, with the county’s main communities. Select a marker for its detail.\n\nAt a glance\n\n## Half of Tuolumne County scores _High_ or worse\n\nWe scored 156 points across Tuolumne County on the same 0–100 scale a Satelife address report uses, and they do not land in one place. 20% of them come out Very High, while 10% are Moderate. Which end your own parcel sits at is not something a county map can tell you.\n\n20%\n\n71%\n\n**Very High** 20% · 31 of 156 points **High** 71% · 110 of 156 points **Moderate** 10% · 15 of 156 points\n\nSafest end we measured 37.1 near unincorporated Tuolumne County · Moderate\n\nMiddle of the county 68.1 High — half of Tuolumne County is above this\n\nMost exposed end we measured 83.6 near Groveland · Very High\n\n### And the federal models agree it is a fire county\n\nRelatively High FEMA National Risk Index — wildfire risk rating · index score 99.3 / 100\n\n$27.3M / yr FEMA NRI — expected annual loss from wildfire · rated Relatively High\n\n1.01% USFS Wildfire Risk to Communities — mean annual burn probability · 90th-percentile cell 2.81%\n\n6.21 ft USFS WRC — mean conditional flame length · 97% of the county carries burnable fuel\n\nFEMA NRI also rates Tuolumne County: all-hazards risk Relatively Moderate · social vulnerability Relatively Moderate · community resilience Relatively Moderate · annualised wildfire frequency 0.0124.\n\nSources: 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.\n\nWhat does your Tuolumne County address score?\n\nA county range shows the spread. Your parcel sits somewhere inside it — the report says where, and what to do about it.\n\nFree to request · PDF report with a 0–100 score, the drivers behind it, and a mitigation plan\n\nLocal context\n\n## What the data says about _Tuolumne County_\n\nMost scored locations fall in the High tier: 110 points were High, compared with 31 in Very High and 15 in Moderate. No scored points fell in the Low tier.\n\nFor county-wide context, FEMA’s National Risk Index rates Tuolumne County’s wildfire risk as Relatively High, and its wildfire expected annual loss as Relatively High.\n\nFire record\n\n## Where the fires _actually were_\n\nThe largest fire listed here is the Rim fire (2013), at 256,916 acres.\n\nThe most recent large fire listed here is the 6-5 fire (2025), at 6,935 acres.\n\nSince 1984, 670,897 acres have burned in the county, which is 46.3% of the county.\n\nThe Hamm fire (1987) is marked as partly in Tuolumne County.\n\n![Rim Fire (2013) in Tuolumne County, California - Sgt. David Calderon, an aviation mechanic in the California Army National Guard’s Detachment 1, Company F, 2nd Battalion, 135th Ge](/images/wildfire-risk/tuolumne-county/photos/california-army-national-guard-aviation-mechanics-maintain-u.webp)\n\n**Rim Fire, 2013** — Tuolumne County. Photo: Spc. Nadine White · [Public domain](https://commons.wikimedia.org/wiki/File:California_Army_National_Guard_aviation_mechanics_maintain_UH-60_Black_Hawks_for_2013_wildfire_fight_130906-A-KH320-007.jpg)\n\n![Donnell Fire (2018) in Tuolumne County, California - Eric Garcia, firefighter, in a field near a cabin covered with pink fire retardant in Stanislaus National Forest, California durin](/images/wildfire-risk/tuolumne-county/photos/180811-stanislaus-cmr-0395-43484688794.webp)\n\n**Donnell Fire, 2018** — Tuolumne County. Photo: Forest Service Photography · [Public domain](https://commons.wikimedia.org/wiki/File:180811-Stanislaus-CMR-0395_\\(43484688794\\).jpg)\n\n492 mapped fire perimeters centred in the county since 1984\n\n670,897 acres inside those perimeters since 1984\n\n46.3% of the county's area, as a share of 5,867.5 km²\n\n6-5 2025 most recent large fire on record\n\nBefore 20002000s2010s2020s \n\nFire perimeters coloured by decade. Select a perimeter for its name, year and size.\n\nNamed fires on record\n\n-   **Rim Fire**2013256,916 acres\n-   **Donnell Fire**201836,461 acres\n-   **Ackerson Fire**199659,151 acres\n-   **Paper Fire**198745,020 acres\n-   **Hamm Fire**198733,144 acres in totalcrossed into the county\n-   **Quarry Fire**20238,645 acres\n-   **Rogge Fire**199620,944 acres\n-   **6-5 Fire**20256,935 acres\n\nPerimeter sources: NIFC Interagency Fire Perimeter History · WFIGS Interagency Perimeters · largest on record: Rim 2013. Perimeters are simplified for display; acreage is the figure the source records.\n\nCommunities\n\n## Where in the county you are _matters most_\n\nAmong named communities, Groveland has one of the higher typical scores at 76.9. Sonora is 72.7, and Tuolumne is 71.2.\n\nColumbia scores 69.3 and Twain Harte 66.4, while Jamestown is lower at 62.7.\n\nCompared with the county middle score of 68.1, several communities sit above that level and several sit below it, which matches the street-to-street variation seen across the county.\n\nGroveland village · 601 people\n\n76.9 _Very High_\n\nSonora town · 4,648 people\n\n72.7 _High_\n\nTuolumne village\n\n71.2 _High_\n\nColumbia village\n\n69.3 _High_\n\nTwain Harte village\n\n66.4 _High_\n\nJamestown village · 3,433 people\n\n62.7 _High_\n\nThe 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.\n\nTerrain & fuels\n\n## Terrain, vegetation and _fuels_\n\nTerrain contributes to higher wildfire risk in parts of Tuolumne County. Terrain scores range from 20.0 near Jamestown to 65.0 in Groveland, with a middle value of 55.0.\n\nVegetation and fuels are also elevated in many places: scores run from 20.0 in Twain Harte to 80.0 near Groveland, with a middle value of 74.0.\n\nFire weather was not measured at all for this county in the places we scored. What we do have countywide scoring for includes hazard-zone and fire-history factors, which have middle values of 73.2 and 70.0.\n\n55 median terrain score (max 65 near Groveland)\n\n74 median vegetation & fuels score (max 80 near Groveland)\n\n![LANDFIRE existing vegetation type map of Tuolumne County, California, with the county boundary outlined](/images/wildfire-risk/tuolumne-county/generated/tuolumne-county-fuels.webp)\n\nLANDFIRE existing vegetation type across Tuolumne County — the same fuel data that feeds the vegetation layer of a Satelife property report.\n\nFire weather\n\n## Fire weather across _Tuolumne County_\n\nFire weather was not measured at the sampled points in Tuolumne County. The other four indicators on this page were, and the bars below show what they found.\n\nWhat drives it\n\n## Which part of the risk _moves_, and which doesn't\n\nRisk is not even across the county. The lowest scored location is 37.1 in unincorporated Tuolumne County, while the highest is 83.6 near Groveland.\n\nThat spread sits around a middle score of 68.1, so many neighborhoods are in a higher-risk band even though some spots score much lower.\n\nBy tier count, High is the most common group with 110 scored points, followed by Very High with 31 and Moderate with 15.\n\nEach bar is what one part of the score covers across Tuolumne 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.\n\nTerrain\n\n20–65 highest near Groveland\n\nVegetation & fuels\n\n20–80 highest near Groveland\n\nHazard zone\n\n10–94.5 highest near Twain Harte\n\nFire history\n\n5–95 highest near Jamestown\n\nOverall score\n\n37.1–83.6 highest near Groveland\n\nThe 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.\n\nShow every number behind these bars\n\nLayer\n\nMin\n\nMedian\n\nMax\n\nLowest place\n\nHighest place\n\nPoints\n\nTerrain\n\n20\n\n55\n\n65\n\nnear Jamestown\n\nGroveland\n\n156\n\nVegetation & fuels\n\n20\n\n74\n\n80\n\nTwain Harte\n\nnear Groveland\n\n156\n\nHazard zone\n\n10\n\n73.2\n\n94.5\n\nunincorporated Tuolumne County\n\nTwain Harte\n\n156\n\nFire history\n\n5\n\n70\n\n95\n\nunincorporated Tuolumne County\n\nnear Jamestown\n\n156\n\nComposite\n\n37.1\n\n68.1\n\n83.6\n\nunincorporated Tuolumne County\n\nnear Groveland\n\n156\n\nIndependently of Satelife's layers, the USFS Wildfire Risk to Communities grid puts the county's mean annual burn probability at **1.01%** (90th percentile cell: **2.81%**), with a mean conditional flame length of **6.21 ft**. **97%** of the 20,767 grid cells inside the county carry burnable fuel at all.\n\nSource: USFS Wildfire Risk to Communities v2.0 (ImageServer, county extent).\n\nCAL FIRE has no mapped Fire Hazard Severity Zone at **114** of the 156 sampled points — the zones cover Local Responsibility Areas, and most of this county is state or federal land. At **113** of them the USFS grid above supplied the hazard reading instead; at the remaining 1 the hazard weight is renormalised away rather than scored as low.\n\n156 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.\n\nFor a property\n\n## What a county range means for _one address_\n\nHazard-zone scores are high in many places we scored. The highest is 94.5 in Twain Harte, the middle is 73.2, and the low end is 10.0 in unincorporated Tuolumne County.\n\nFire-history scores also span a wide range: up to 95.0 near Jamestown, with a middle value of 70.0 and a low of 5.0 in unincorporated Tuolumne County.\n\nIn the USFS Wildfire Risk to Communities product, mean annual burn probability is 1.01%, and the 90th-percentile cell burn probability is 2.81%.\n\nThat same USFS product indicates 97.4% of the county can burn, and lists a mean conditional flame length of 6.21 feet.\n\nAcross 156 sampled points in Tuolumne County, the score runs from 37.1 to 83.6 — 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.\n\nFind out where your Tuolumne County parcel sits\n\nSlope, the fuel touching the structure, the road out, the fire history within a mile — measured at your address, not averaged across the county.\n\nFree to request · PDF report with a 0–100 score, the drivers behind it, and a mitigation plan\n\nCoverage\n\n## ZIP codes we cover in Tuolumne County\n\nEvery one of the 27 ZIP areas that touch Tuolumne 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.\n\n**Very High** 2 ZIPs\n\n-   [95375 Twain Harte80](/wildfire-risk/zip/95375/)\n-   [95305 Groveland76](/wildfire-risk/zip/95305/)\n\n**High** 10 ZIPs\n\n-   [95335 Twain Harte75](/wildfire-risk/zip/95335/)\n-   [95310 Columbia69](/wildfire-risk/zip/95310/)\n-   [95321 69](/wildfire-risk/zip/95321/)\n-   [95383 Twain Harte68](/wildfire-risk/zip/95383/)\n-   [95379 Tuolumne66](/wildfire-risk/zip/95379/)\n-   [95370 Sonora66](/wildfire-risk/zip/95370/)\n-   [95329 Groveland65](/wildfire-risk/zip/95329/)\n-   [95364 60](/wildfire-risk/zip/95364/)\n-   [95327 Jamestown58](/wildfire-risk/zip/95327/)\n-   [95346 Twain Harte56](/wildfire-risk/zip/95346/)\n\n**Moderate** 1 ZIP\n\n-   [95389 49](/wildfire-risk/zip/95389/)\n\n**No sampled point inside** 14 ZIPs\n\n[93517](/wildfire-risk/zip/93517/) · [93529](/wildfire-risk/zip/93529/) · [93541](/wildfire-risk/zip/93541/) · [95222 Columbia](/wildfire-risk/zip/95222/) · [95223](/wildfire-risk/zip/95223/) · [95224 Twain Harte](/wildfire-risk/zip/95224/) · [95228 Jamestown](/wildfire-risk/zip/95228/) · [95247 Columbia](/wildfire-risk/zip/95247/) · [95251 Columbia](/wildfire-risk/zip/95251/) · [95309 Jamestown](/wildfire-risk/zip/95309/) · [95311 Groveland](/wildfire-risk/zip/95311/) · [95361 Jamestown](/wildfire-risk/zip/95361/) · [95372 Tuolumne](/wildfire-risk/zip/95372/) · [95386 Jamestown](/wildfire-risk/zip/95386/)\n\nGrouped from 13 of 27 ZIP areas — the rest had no sample point fall inside them. The community shown is the nearest mapped place to the ZIP's centre.\n\nZIP areas are Census 2020 ZIP Code Tabulation Areas intersecting the county boundary.\n\nWhere to go next\n\n## Tuolumne County wildfire risk _in context_\n\n[California wildfire risk The statewide picture and every county page we publish](/wildfire-risk/california/) [Wildfire risk by state Every state and county we cover](/wildfire-risk/) [How Satelife calculates wildfire risk Data sources, layers, score composition, honest limits](/wildfire-risk/methodology/) [Create a wildfire evacuation plan Zones, egress routes, refuge areas](/wildfire-evacuation-plan/) [Run a report for a Tuolumne County address PDF + score + mitigation plan](/#cta)\n\nFAQ\n\n## Frequently asked questions about _Tuolumne County wildfire risk_\n\nWhat risk tier is most common in Tuolumne County?\n\nHigh is the most common tier in the scored locations, with 110 points. Very High has 31 points, and Moderate has 15.\n\nWhat are the largest and most recent large fires listed for this county?\n\nThe largest listed fire is Rim (2013). The most recent large fire listed is 6-5 (2025).\n\nIs fire weather included in these county scores?\n\nNo. Fire weather was not measured at all for this county in the places we scored. The page does include other wildfire-risk factors such as terrain, vegetation and fuels, hazard-zone, and fire-history scores.\n\nWhat does FEMA say about county-wide wildfire risk?\n\nFEMA’s National Risk Index rates Tuolumne County’s wildfire risk as Relatively High, and its wildfire expected annual loss as Relatively High.\n\nHow much of Tuolumne County has burned since 1984?\n\n46.3% of the county has burned since 1984, totaling 670,897 acres.\n\nThis page is generated from a Tuolumne 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.\n\n## What does _your parcel_ look like, layer by layer?\n\nA 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.\n\n[Start with your address →](/#cta)\n\n[![PRR](/images/prr.png)](/ficha-de-website-voucher-satelife.pdf)\n\n© 2024–2026 Satelife, Lda. All rights reserved.\n\nSatelife reports are for informational purposes only and do not constitute insurance, financial, or legal advice."
}