Colusa County

County in California

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Report created October 27, 2026 at www.firezones.info/county/011/colusa

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    23% Very High

    All 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

    27% has burned

    Most recently the 2024 Ridge Fire, which burned 2,377 acres here, one of 91 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    38% 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 172,269 acres · State Responsibility Area 23%
  2. High 78,769 acres · 72,512 state, 6,257 local 11%
  3. Moderate 3,557 acres · 1,771 state, 1,786 local <1%
  4. Non-wildland 358,118 acres · Local Responsibility Area 48%
  5. Not mapped by CAL FIRE 127,343 acres · Mostly federal land 17%

740,056 acres of land in all, 246,551 in the State Responsibility Area and 366,161 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. 2018 Ranch Fire Of 410,202 acres in all · Cause: Miscellaneous 73,732 acres
  2. 2012 Mill Fire Cause: Miscellaneous 29,523 acres
  3. 2024 Sites Fire Cause: Power lines 19,132 acres
  4. 2012 Sixteen Complex Of 17,942 acres in all · Cause: Arson 17,690 acres
  5. 1966 Cortina Ridge Fire 16,323 acres
  6. 1928 Pacific Fire Cause: Equipment use 15,607 acres
  7. 1948 Unnamed fire 12,222 acres
  8. 2015 Rocky Fire Of 69,438 acres in all · Cause: Miscellaneous 10,451 acres
  9. 1950 Little Stoney Fire Of 17,367 acres in all 9,284 acres
  10. 2001 Trough Fire Of 24,927 acres in all · Cause: Miscellaneous 7,325 acres

And 81 smaller fires. In all, 201,499 acres of Colusa 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 Colusa County

Unincorporated communities in Colusa County

ZIP codes in Colusa County

Neighboring counties

  1. Colusa County 23% Very High · this area
  2. Butte County 38% Very High
  3. Glenn County 13% Very High
  4. Lake County 45% Very High
  5. Sutter County 7% High · 5% Very High
  6. Yolo County 18% Very High