ZIP code 91739

San Bernardino County, including Rancho Cucamonga

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Report created October 27, 2026 at www.firezones.info/zip/91739

  • 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

    74% has burned

    Most recently the 2014 Etiwanda Fire, which burned 1,359 acres here, one of 31 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    48% 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 6,574 acres · 1,303 state, 5,271 local 36%
  2. High 523 acres · Local Responsibility Area 3%
  3. Moderate 450 acres · Local Responsibility Area 2%
  4. Non-wildland 4,232 acres · Local Responsibility Area 23%
  5. Not mapped by CAL FIRE 6,416 acres · Mostly federal land 35%

18,195 acres of land in all, 1,303 in the State Responsibility Area and 10,476 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 12,067 acres
  2. 2003 Grand Prix Fire Of 50,618 acres in all · Cause: Arson 12,015 acres
  3. 1988 Texas Fire Of 12,096 acres in all · Cause: Arson 8,687 acres
  4. 1988 Unnamed fire Of 4,358 acres in all 4,244 acres
  5. 1980 Summit Fire Of 4,368 acres in all 3,748 acres
  6. 1988 Unnamed fire Of 5,244 acres in all 2,870 acres
  7. 1957 Morse Fire Of 2,474 acres in all 2,428 acres
  8. 1936 Unnamed fire Of 4,704 acres in all 2,220 acres
  9. 1913 Unnamed fire Of 3,086 acres in all 1,447 acres
  10. 2014 Etiwanda Fire Of 2,142 acres in all · Cause: Miscellaneous 1,359 acres

And 21 smaller fires. In all, 13,494 acres of ZIP code 91739 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 91739

Neighboring ZIP codes

  1. 91739 36% Very High · this area
  2. 91701 15% Very High
  3. 91730 No hazard zones
  4. 91737 57% Very High
  5. 91764 No hazard zones
  6. 92335 No hazard zones
  7. 92336 11% Very High
  8. 92358 7% Very High
  9. 92407 28% Very High