Alameda County

Summary

• Fire hazard severity zones

  Share of the land in each CAL FIRE hazard class

  Map
  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 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 86 fires that burned here

  Map
  1. 2020 Scu Lightning Complex 396,824 acres in total · Cause: Lightning 24,498 acres here
  2. 1983 Del Valle P.g.&E. Fire Cause: Equipment use 4,713 acres here
  3. 2005 Tesla Fire 6,440 acres in total · Cause: Arson 3,967 acres here
  4. 2003 Devil Fire 5,444 acres in total · Cause: Lightning 3,775 acres here
  5. 2015 Tesla Fire 2,990 acres in total 2,802 acres here
  6. 2006 Midway Fire 5,540 acres in total · Cause: Power lines 2,394 acres here
  7. 1970 Carnegie #3 Fire 4,390 acres in total 1,750 acres here
  8. 1991 Tunnel Fire 1,614 acres here
  9. 1970 Wprr #9 Fire 1,533 acres here
  10. 1959 Marciel Fire 1,295 acres here

  And 76 smaller fires. The most recent was the 2025 Mayhews Fire, which burned 1 acre here. 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