ZIP code 91741

Los Angeles County, including Glendora and San Dimas

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Report created October 27, 2026 at www.firezones.info/zip/91741

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    33% Very High

    Most of the Very High land is in the Local Responsibility Area, where each city or county adopts the zones CAL FIRE recommends.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    68% has burned

    Most recently the 2024 Bridge Fire, which burned 10 acres here, one of 28 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    74% 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 4,315 acres · 244 state, 4,072 local 33%
  2. High 341 acres · Local Responsibility Area 3%
  3. Moderate 328 acres · Local Responsibility Area 3%
  4. Non-wildland 2,072 acres · Local Responsibility Area 16%
  5. Not mapped by CAL FIRE 6,069 acres · Mostly federal land 46%

13,125 acres of land in all, 244 in the State Responsibility Area and 6,813 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. 1919 San Gabriel Fire Of 54,610 acres in all 7,135 acres
  2. 2002 Williams Fire Of 38,119 acres in all · Cause: Arson 6,993 acres
  3. 1960 Unnamed fire Of 22,736 acres in all 6,899 acres
  4. 2014 Colby Fire Of 1,952 acres in all · Cause: Campfire 1,258 acres
  5. 1968 Canyon Inn Fire Of 19,056 acres in all 807 acres
  6. 1968 Easley Fire Of 589 acres in all 465 acres
  7. 1981 Mull Fire Of 668 acres in all 289 acres
  8. 1960 Unnamed fire 198 acres
  9. 1932 Morgan No. 24 Fire Of 550 acres in all 198 acres
  10. 1947 Unnamed fire 185 acres

And 18 smaller fires. In all, 8,956 acres of ZIP code 91741 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

Communities in ZIP code 91741

Neighboring ZIP codes

  1. 91741 33% Very High · this area
  2. 91702 7% Very High
  3. 91740 29% Very High
  4. 91750 29% Very High
  5. 91773 33% Very High