ZIP code 91737

San Bernardino County, including Rancho Cucamonga

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Report created October 27, 2026 at www.firezones.info/zip/91737

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    57% 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

    70% has burned

    Most recently the 2014 Etiwanda Fire, which burned 783 acres here, one of 20 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    29% 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 3,688 acres · 1,116 state, 2,573 local 57%
  2. High 408 acres · Local Responsibility Area 6%
  3. Moderate 307 acres · Local Responsibility Area 5%
  4. Non-wildland 2,042 acres · Local Responsibility Area 32%
  5. Not mapped by CAL FIRE 12 acres · Mostly federal land <1%

6,458 acres of land in all, 1,116 in the State Responsibility Area and 5,330 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. 1970 Unnamed fire Of 37,472 acres in all · Cause: Miscellaneous 4,104 acres
  2. 2003 Grand Prix Fire Of 50,618 acres in all · Cause: Arson 2,836 acres
  3. 2014 Etiwanda Fire Of 2,142 acres in all · Cause: Miscellaneous 783 acres
  4. 1921 Unnamed fire Of 805 acres in all 567 acres
  5. 1970 Fpd #92 (Al) Fire Of 500 acres in all 370 acres
  6. 1964 Unnamed fire Of 240 acres in all 217 acres
  7. 1925 Unnamed fire 189 acres
  8. 1916 Unnamed fire 176 acres
  9. 1966 Unnamed fire 173 acres
  10. 1985 Archibald Fire Of 378 acres in all · Cause: Equipment use 158 acres

And 10 smaller fires. In all, 4,504 acres of ZIP code 91737 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 91737

Neighboring ZIP codes

  1. 91737 57% Very High · this area
  2. 91701 15% Very High
  3. 91739 36% Very High
  4. 92358 7% Very High