Walnut

City in Los Angeles County

Search for an address

Report created October 31, 2026 at www.firezones.org/community/83332/walnut

Summary

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

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

    5,755 acres of land in all, 5,755 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 13 fires that burned here

    1. 1972 Winnett Fire 747 acres in total 687 acres here
    2. 1929 Ryan 116 Fire 543 acres in total 457 acres here
    3. 1970 Winnet Fire 305 acres here
    4. 1949 Citurs No. 174 Fire 517 acres in total 263 acres here
    5. 1972 Buzzard Peak Fire 183 acres in total 139 acres here
    6. 1971 Gartel Fire 119 acres here
    7. 1928 Quinn 22 Fire 104 acres here
    8. 1989 Onyx Fire 326 acres in total 95 acres here
    9. 1955 Unnamed fire 91 acres here
    10. 1994 Amar Fire 78 acres in total 77 acres here

    And 3 smaller fires. The most recent was the 1994 Amar Fire, which burned 77 acres here. 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

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

Sources

Fire hazard severity zones
CAL FIRE Office of the State Fire Marshal
State map published June 27, 2025, local map February 2, 2026
Fire history
CAL FIRE Fire and Resource Assessment Program
Published July 28, 2026

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