ZIP code 92377

San Bernardino County, including Rialto

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Report created October 27, 2026 at www.firezones.info/zip/92377

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    28% High · <1% Very High

    Most of the 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

    43% has burned

    Most recently the 2010 Cactus Fire, which burned 38 acres here, one of 12 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    30% Elevated

    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 12 acres · Local Responsibility Area <1%
  2. High 1,301 acres · 41 state, 1,260 local 28%
  3. Moderate 252 acres · <1 state, 252 local 5%
  4. Non-wildland 3,043 acres · Local Responsibility Area 66%

4,608 acres of land in all, 41 in the State Responsibility Area and 4,567 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. 1979 Sierra Series Fire Of 1,838 acres in all 1,241 acres
  2. 2003 Grand Prix Fire Of 50,618 acres in all · Cause: Arson 349 acres
  3. 1959 Stonehurst Fire Of 341 acres in all 322 acres
  4. 1967 Fpd #49 Fire Of 462 acres in all 274 acres
  5. 1967 County Roads #15 Fire Of 453 acres in all 272 acres
  6. 1925 Unnamed fire Of 1,185 acres in all 96 acres
  7. 1973 Sycamore Fire Of 1,655 acres in all 49 acres
  8. 1914 Unnamed fire 45 acres
  9. 2010 Cactus Fire Of 40 acres in all · Cause: Power lines 38 acres
  10. 1970 Unnamed fire Of 37,472 acres in all · Cause: Miscellaneous 24 acres

And 2 smaller fires. In all, 1,961 acres of ZIP code 92377 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 92377

Neighboring ZIP codes

  1. 92377 28% High · <1% Very High · this area
  2. 92336 11% Very High
  3. 92358 7% Very High
  4. 92376 3% High
  5. 92407 28% Very High
  6. 92411 14% High