San Joaquin County

County in California

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Report created October 27, 2026 at www.firezones.info/county/077/san-joaquin

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    10% Moderate · 4% Very High

    Most of the Moderate land is in the State Responsibility Area, where the State Fire Marshal's zones apply.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    7% has burned

    Most recently the 2025 Quarry Fire, which burned 26 acres here, one of 85 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    <1% Elevated

    Utilities may shut off power in the CPUC High Fire-Threat District in fire weather, and homes outside it can lose power when their lines run through it.

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Land by hazard class

  1. Very High 32,334 acres · State Responsibility Area 4%
  2. High 38,713 acres · 33,420 state, 5,293 local 4%
  3. Moderate 88,466 acres · 79,542 state, 8,923 local 10%
  4. Non-wildland 746,152 acres · Local Responsibility Area 82%
  5. Not mapped by CAL FIRE 7,396 acres · Mostly federal land 1%

913,060 acres of land in all, 145,296 in the State Responsibility Area and 760,368 in the Local. State zones are the ones the State Fire Marshal designated, in effect since 1 April 2024. Local zones are CAL FIRE's 2025 recommendation, which each city or county adopts by ordinance and can make stricter. How to read fire zones

Largest fires

  1. 2020 Scu Lightning Complex Of 396,824 acres in all · Cause: Lightning 24,336 acres
  2. 2024 Corral Fire 14,164 acres
  3. 2009 Corral Fire Cause: Miscellaneous 12,239 acres
  4. 1984 Site 300 #3 Fire 7,605 acres
  5. 1951 Smiths Ridge Fire Of 4,417 acres in all 4,234 acres
  6. 2006 Midway Fire Of 5,540 acres in all · Cause: Power lines 3,145 acres
  7. 1953 San Joaquin Co. Fire 2,759 acres
  8. 1970 Carnegie #3 Fire Of 4,390 acres in all 2,640 acres
  9. 2005 Tesla Fire Of 6,440 acres in all · Cause: Arson 2,470 acres
  10. 2009 Explosives Fire Cause: Power lines 1,988 acres

And 75 smaller fires. In all, 66,978 acres of San Joaquin County have burned. Acres are the land each fire burned here, and fires that crossed less than an acre are not counted. Some older or smaller fires may be missing, and a fire perimeter can include unburned patches. How to read fire history

Sources

Fire hazard severity zones
CAL FIRE Office of the State Fire Marshal
State map published 27 June 2025, local map 2 February 2026
Fire history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Power line fire risk
California Public Utilities Commission
Published 23 February 2026

This site is independent and not affiliated with CAL FIRE or the CPUC, so for an official determination, check with the agency or your city or county. How we read the data

Nearby areas

Cities and towns in San Joaquin County

Unincorporated communities in San Joaquin County

ZIP codes in San Joaquin County

Neighboring counties

  1. San Joaquin County 10% Moderate · 4% Very High · this area
  2. Alameda County 25% Very High
  3. Amador County 44% Very High
  4. Calaveras County 54% Very High
  5. Contra Costa County 17% Very High
  6. Sacramento County 26% Moderate · <1% Very High
  7. Santa Clara County 51% Very High
  8. Stanislaus County 22% Very High