Alameda County

County in California

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Report created October 27, 2026 at www.firezones.info/county/001/alameda

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    25% Very High

    Most of the Very High 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

    13% has burned

    Most recently the 2025 Mayhews Fire, which burned 1 acre here, one of 86 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    12% Extreme

    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 118,756 acres · 115,913 state, 2,843 local 25%
  2. High 133,534 acres · 108,730 state, 24,803 local 28%
  3. Moderate 50,401 acres · 27,583 state, 22,817 local 10%
  4. Non-wildland 160,818 acres · Local Responsibility Area 33%
  5. Not mapped by CAL FIRE 16,672 acres · Mostly federal land 3%

480,180 acres of land in all, 252,226 in the State Responsibility Area and 211,282 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 24,498 acres
  2. 1983 Del Valle P.g.&E. Fire Cause: Equipment use 4,713 acres
  3. 2005 Tesla Fire Of 6,440 acres in all · Cause: Arson 3,967 acres
  4. 2003 Devil Fire Of 5,444 acres in all · Cause: Lightning 3,775 acres
  5. 2015 Tesla Fire Of 2,990 acres in all 2,802 acres
  6. 2006 Midway Fire Of 5,540 acres in all · Cause: Power lines 2,394 acres
  7. 1970 Carnegie #3 Fire Of 4,390 acres in all 1,750 acres
  8. 1991 Tunnel Fire 1,614 acres
  9. 1970 Wprr #9 Fire 1,533 acres
  10. 1959 Marciel Fire 1,295 acres

And 76 smaller fires. In all, 61,219 acres of Alameda 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 Alameda County

Unincorporated communities in Alameda County

ZIP codes in Alameda County

53

Neighboring counties

  1. Alameda County 25% Very High · this area
  2. Contra Costa County 17% Very High
  3. San Francisco County <1% Moderate · <1% Very High
  4. San Joaquin County 10% Moderate · 4% Very High
  5. Santa Clara County 51% Very High
  6. Stanislaus County 22% Very High