Rialto

City in San Bernardino County

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Report created October 27, 2026 at www.firezones.info/community/60466/rialto

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    14% High · <1% Very High

    Most of the High land is in the Local Responsibility Area, where the City of Rialto adopts the zones CAL FIRE recommends.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    17% 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

    16% 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 · <1 state, 12 local <1%
  2. High 2,223 acres · 1 state, 2,222 local 14%
  3. Moderate 311 acres · <1 state, 311 local 2%
  4. Non-wildland 12,881 acres · Local Responsibility Area 83%
  5. Not mapped by CAL FIRE 1 acres · Mostly federal land <1%

15,428 acres of land in all, 1 in the State Responsibility Area and 15,426 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 1,485 acres
  2. 2003 Grand Prix Fire Of 50,618 acres in all · Cause: Arson 635 acres
  3. 1959 Stonehurst Fire 341 acres
  4. 1973 Sycamore Fire Of 1,655 acres in all 321 acres
  5. 1967 Fpd #49 Fire Of 462 acres in all 274 acres
  6. 1967 County Roads #15 Fire Of 453 acres in all 272 acres
  7. 1925 Unnamed fire Of 1,185 acres in all 107 acres
  8. 1970 Unnamed fire Of 121 acres in all 80 acres
  9. 1970 Unnamed fire Of 37,472 acres in all · Cause: Miscellaneous 78 acres
  10. 1914 Unnamed fire 45 acres

And 2 smaller fires. In all, 2,589 acres of Rialto 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

ZIP codes in Rialto

Neighboring communities

  1. Rialto 14% High · <1% Very High · this area
  2. Bloomington 11% Very High
  3. Colton 14% Very High
  4. Fontana 15% Very High
  5. Jurupa Valley 22% Very High
  6. Muscoy 29% High
  7. Riverside 21% Very High
  8. San Bernardino 29% Very High