Diamond Bar

Summary

• Fire hazard severity zones

  Share of the land in each CAL FIRE hazard class

  Map
  1. Very High 3,429 acres · Local Responsibility Area 36%
  2. High 1,925 acres · Local Responsibility Area 20%
  3. Moderate 743 acres · Local Responsibility Area 8%
  4. Non-wildland 3,427 acres · Local Responsibility Area 36%

  9,525 acres of land in all, 9,525 of it in the Local 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 25 fires that burned here

  Map
  1. 1946 Diamond F141 Fire 919 acres here
  2. 1929 Kelly No. 41 Fire 1,347 acres in total 740 acres here
  3. 1972 Golden Springs Fire 718 acres here
  4. 1957 Unnamed fire 281 acres in total 121 acres here
  5. 1947 Arnold No. 106 Fire 1,907 acres in total 111 acres here
  6. 1968 San Leandero Fire 103 acres here
  7. 1974 Unnamed fire 102 acres here
  8. 1928 Diamond No. 101 Fire 261 acres in total 92 acres here
  9. 1988 Diamond Bar Fire 119 acres in total 84 acres here
  10. 2009 Diamond Fire 155 acres in total · Cause: Vehicle 80 acres here

  And 15 smaller fires. The most recent was the 2022 Cut Off Fire, which burned 2 acres here. In all, 2,775 acres of Diamond Bar 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