Walnut

City in Los Angeles County

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Report created October 27, 2026 at www.firezones.info/community/83332/walnut

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    15% Very High

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

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    36% has burned

    Most recently the 1994 Amar Fire, which burned 77 acres here, one of 13 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    16% Elevated

    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 844 acres · <1 state, 844 local 15%
  2. High 1,217 acres · <1 state, 1,217 local 21%
  3. Moderate 356 acres · <1 state, 356 local 6%
  4. Non-wildland 3,338 acres · Local Responsibility Area 58%

5,755 acres of land in all, <1 in the State Responsibility Area and 5,755 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. 1972 Winnett Fire Of 747 acres in all 687 acres
  2. 1929 Ryan 116 Fire Of 543 acres in all 457 acres
  3. 1970 Winnet Fire 305 acres
  4. 1949 Citurs No. 174 Fire Of 517 acres in all 263 acres
  5. 1972 Buzzard Peak Fire Of 183 acres in all 139 acres
  6. 1971 Gartel Fire 119 acres
  7. 1928 Quinn 22 Fire 104 acres
  8. 1989 Onyx Fire Of 326 acres in all 95 acres
  9. 1955 Unnamed fire 91 acres
  10. 1994 Amar Fire Of 78 acres in all 77 acres

And 3 smaller fires. In all, 2,069 acres of Walnut 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 Walnut

Neighboring communities

  1. Walnut 15% Very High · this area
  2. Covina <1% Moderate · <1% Very High
  3. Diamond Bar 36% Very High
  4. Industry 11% High · 3% Very High
  5. Pomona 11% High · <1% Very High
  6. Rowland Heights 55% Very High
  7. San Dimas 32% Very High
  8. South San Jose Hills No hazard zones
  9. West Covina 8% High · <1% Very High