Acton

Summary

• Fire hazard severity zones

  Share of the land in each CAL FIRE hazard class

  Map
  1. Very High 24,403 acres · State Responsibility Area 97%
  2. High 46 acres · State Responsibility Area <1%
  3. Not mapped by CAL FIRE 692 acres · Mostly federal land 3%

  25,140 acres of land in all, 24,448 of it in the State Responsibility Area. 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 40 fires that burned here

  Map
  1. 1970 Shannon Fire 2,509 acres in total 2,014 acres here
  2. 1942 Tolle Fire 1,088 acres in total 950 acres here
  3. 1940 Rover No. 186 Fire 701 acres here
  4. 1922 Mint Cyn Fire 20,512 acres in total 673 acres here
  5. 1941 Frazier 216 Fire 594 acres here
  6. 1984 Shannon Fire 3,498 acres in total 493 acres here
  7. 2004 Crown Fire 11,754 acres in total · Cause: Equipment use 461 acres here
  8. 1979 Crown Fire 3,902 acres in total 411 acres here
  9. 1980 Pass Fire 7,604 acres in total 403 acres here
  10. 1942 Richards/Soledad Cyn Fire 2,973 acres in total 389 acres here

  And 30 smaller fires. The most recent was the 2025 Hawk Fire, which burned 162 acres here. In all, 7,435 acres of Acton 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