ZIP code 91784

San Bernardino County, including Upland and San Antonio Heights

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Report created October 27, 2026 at www.firezones.info/zip/91784

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    25% 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

    42% has burned

    Most recently the 2008 San Antonio Fire, which burned 54 acres here, one of 22 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    10% 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 1,495 acres · 619 state, 876 local 25%
  2. High 627 acres · Local Responsibility Area 11%
  3. Moderate 320 acres · Local Responsibility Area 5%
  4. Non-wildland 3,301 acres · Local Responsibility Area 55%
  5. Not mapped by CAL FIRE 224 acres · Mostly federal land 4%

5,968 acres of land in all, 619 in the State Responsibility Area and 5,125 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. 1910 Unnamed fire Of 1,646 acres in all 992 acres
  2. 2003 Grand Prix Fire Of 50,618 acres in all · Cause: Arson 974 acres
  3. 1970 Unnamed fire Of 37,472 acres in all · Cause: Miscellaneous 629 acres
  4. 2003 Padua Fire Of 10,458 acres in all · Cause: Arson 281 acres
  5. 1935 San Antonio Canyon Fire Of 586 acres in all 258 acres
  6. 1960 Armstrong Fire Of 807 acres in all 242 acres
  7. 1945 Unnamed fire Of 418 acres in all 232 acres
  8. 1911 Unnamed fire Of 349 acres in all 206 acres
  9. 1961 Unnamed fire 201 acres
  10. 1958 Dam Fire 147 acres

And 12 smaller fires. In all, 2,497 acres of ZIP code 91784 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 91784

Neighboring ZIP codes

  1. 91784 25% Very High · this area
  2. 91701 15% Very High
  3. 91711 42% Very High
  4. 91730 No hazard zones
  5. 91759 3% Very High
  6. 91786 2% High
  7. 92358 7% Very High