Rialto

Summary

• Fire hazard severity zones

  Share of the land in each CAL FIRE hazard class

  Map
  1. Very High 12 acres · Local Responsibility Area <1%
  2. High 2,223 acres · 1 state, 2,222 local 14%
  3. Moderate 311 acres · Local Responsibility Area 2%
  4. Non-wildland 12,881 acres · Local Responsibility Area 83%
  5. Not mapped by CAL FIRE 1 acre · Mostly federal land <1%

  15,428 acres of land in all, 1 in the State Responsibility Area and 15,426 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 12 fires that burned here

  Map
  1. 1979 Sierra Series Fire 1,838 acres in total 1,485 acres here
  2. 2003 Grand Prix Fire 50,618 acres in total · Cause: Arson 635 acres here
  3. 1959 Stonehurst Fire 341 acres here
  4. 1973 Sycamore Fire 1,655 acres in total 321 acres here
  5. 1967 Fpd #49 Fire 462 acres in total 274 acres here
  6. 1967 County Roads #15 Fire 453 acres in total 272 acres here
  7. 1925 Unnamed fire 1,185 acres in total 107 acres here
  8. 1970 Unnamed fire 121 acres in total 80 acres here
  9. 1970 Unnamed fire 37,472 acres in total · Cause: Miscellaneous 78 acres here
  10. 1914 Unnamed fire 45 acres here

  And 2 smaller fires. The most recent was the 2010 Cactus Fire, which burned 38 acres here. In all, 2,589 acres of Rialto 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