ZIP code 91001

Los Angeles County, including Altadena and Pasadena

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Report created October 27, 2026 at www.firezones.info/zip/91001

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    36% 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

    71% has burned

    Most recently the 2025 Eaton Fire, which burned 3,374 acres here, one of 21 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    34% 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 1,910 acres · 616 state, 1,294 local 36%
  2. High 379 acres · Local Responsibility Area 7%
  3. Moderate 395 acres · Local Responsibility Area 7%
  4. Non-wildland 2,173 acres · Local Responsibility Area 41%
  5. Not mapped by CAL FIRE 451 acres · Mostly federal land 9%

5,309 acres of land in all, 616 in the State Responsibility Area and 4,242 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. 2025 Eaton Fire Of 14,056 acres in all 3,374 acres
  2. 1935 Las Flores No. 57 Fire Of 2,521 acres in all 1,283 acres
  3. 1900 Big Fire Of 2,521 acres in all 1,283 acres
  4. 1993 Kinneloa Fire Of 5,454 acres in all 443 acres
  5. 1979 Pinecrest/Usfs Fire Of 5,306 acres in all 261 acres
  6. 2009 Station Fire Of 160,833 acres in all · Cause: Arson 185 acres
  7. 1917 Unnamed fire Of 214 acres in all 168 acres
  8. 1917 Unnamed fire Of 313 acres in all 152 acres
  9. 1934 Brown Mtn No. 29 Fire Of 3,772 acres in all 119 acres
  10. 1962 Unnamed fire Of 545 acres in all 62 acres

And 11 smaller fires. In all, 3,747 acres of ZIP code 91001 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 91001

Neighboring ZIP codes

  1. 91001 36% Very High · this area
  2. 91011 81% Very High
  3. 91103 37% Very High
  4. 91104 1% Moderate · <1% Very High
  5. 91105 69% Very High
  6. 91107 21% Very High