San Dimas

City in Los Angeles County

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Report created October 27, 2026 at www.firezones.info/community/66070/san-dimas

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    32% Very High

    Most of the Very High land is in the Local Responsibility Area, where the City of San Dimas adopts the zones CAL FIRE recommends.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    46% has burned

    Most recently the 2021 Kellogg Fire, which burned 12 acres here, one of 56 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    28% Extreme

    Utilities may shut off power in the CPUC High Fire-Threat District in fire weather, and homes outside it can lose power when their lines run through it.

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Land by hazard class

  1. Very High 3,186 acres · <1 state, 3,186 local 32%
  2. High 1,813 acres · 2 state, 1,811 local 18%
  3. Moderate 536 acres · 1 state, 535 local 5%
  4. Non-wildland 3,068 acres · Local Responsibility Area 31%
  5. Not mapped by CAL FIRE 1,268 acres · Mostly federal land 13%

9,871 acres of land in all, 2 in the State Responsibility Area and 8,601 in the Local. State zones are the ones the State Fire Marshal designated, in effect since 1 April 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

Largest fires

  1. 2002 Williams Fire Of 38,119 acres in all · Cause: Arson 2,036 acres
  2. 1960 Unnamed fire Of 22,736 acres in all 1,990 acres
  3. 1919 San Gabriel Fire Of 54,610 acres in all 1,828 acres
  4. 1957 Unnamed fire 461 acres
  5. 1981 Mull Fire Of 668 acres in all 381 acres
  6. 1932 Morgan No. 24 Fire Of 550 acres in all 361 acres
  7. 1927 Phillips No. 51 Fire Of 364 acres in all 355 acres
  8. 1975 Via Verde Fire 331 acres
  9. 1971 Lodi Fire Of 343 acres in all 250 acres
  10. 1955 Puddingstone Fire Of 251 acres in all 248 acres

And 46 smaller fires. In all, 4,529 acres of San Dimas 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

Sources

Fire hazard severity zones
CAL FIRE Office of the State Fire Marshal
State map published 27 June 2025, local map 2 February 2026
Fire history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Power line fire risk
California Public Utilities Commission
Published 23 February 2026

This site is independent and not affiliated with CAL FIRE or the CPUC, so for an official determination, check with the agency or your city or county. How we read the data

Nearby areas

ZIP codes in San Dimas

Neighboring communities

  1. San Dimas 32% Very High · this area
  2. Charter Oak No hazard zones
  3. Covina <1% Moderate · <1% Very High
  4. Glendora 41% Very High
  5. La Verne 29% Very High
  6. Pomona 11% High · <1% Very High
  7. Walnut 15% Very High