San Joaquin County

Summary

• Fire hazard severity zones

  Share of the land in each CAL FIRE hazard class

  Map
  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 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 85 fires that burned here

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

  And 75 smaller fires. The most recent was the 2025 Quarry Fire, which burned 26 acres here. 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