Colusa County

Summary

• Fire hazard severity zones

  Share of the land in each CAL FIRE hazard class

  Map
  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 April 1, 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

• Fire history

  The 10 largest of 91 fires that burned here

  Map
  1. 2018 Ranch Fire 410,202 acres in total · Cause: Miscellaneous 73,732 acres here
  2. 2012 Mill Fire Cause: Miscellaneous 29,523 acres here
  3. 2024 Sites Fire Cause: Power lines 19,132 acres here
  4. 2012 Sixteen Complex 17,942 acres in total · Cause: Arson 17,690 acres here
  5. 1966 Cortina Ridge Fire 16,323 acres here
  6. 1928 Pacific Fire Cause: Equipment use 15,607 acres here
  7. 1948 Unnamed fire 12,222 acres here
  8. 2015 Rocky Fire 69,438 acres in total · Cause: Miscellaneous 10,451 acres here
  9. 1950 Little Stoney Fire 17,367 acres in total 9,284 acres here
  10. 2001 Trough Fire 24,927 acres in total · Cause: Miscellaneous 7,325 acres here

  And 81 smaller fires. The most recent was the 2024 Ridge Fire, which burned 2,377 acres here. 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