Janesville

Community in Lassen County

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Report created October 27, 2026 at www.firezones.info/community/37134/janesville

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    21% Very High

    All of the Very High land is in the State Responsibility Area, where the State Fire Marshal's zones apply.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    16% has burned

    Most recently the 2025 Byers Fire, which burned 87 acres here, one of 11 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    58% 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 4,508 acres · State Responsibility Area 21%
  2. High 6,268 acres · 5,503 state, 765 local 29%
  3. Moderate 828 acres · 641 state, 187 local 4%
  4. Non-wildland 6,133 acres · Local Responsibility Area 28%
  5. Not mapped by CAL FIRE 3,917 acres · Mostly federal land 18%

21,654 acres of land in all, 10,652 in the State Responsibility Area and 7,085 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. 1944 Unnamed fire 716 acres
  2. 1973 Sunnyside Dump #3 Fire 640 acres
  3. 1985 Bass Fire Of 2,382 acres in all · Cause: Equipment use 508 acres
  4. 1927 Unnamed fire Of 725 acres in all 486 acres
  5. 2003 A-3 Fire Of 1,051 acres in all · Cause: Equipment use 468 acres
  6. 2018 Hyatt Fire Of 432 acres in all · Cause: Playing with fire 299 acres
  7. 2010 Sunnyside Fire Of 231 acres in all · Cause: Lightning 186 acres
  8. 1996 Byers Fire Of 1,019 acres in all 151 acres
  9. 2025 Byers Fire Of 105 acres in all · Cause: Miscellaneous 87 acres
  10. 1933 Unnamed fire Of 914 acres in all 54 acres

And 1 smaller fire. In all, 3,456 acres of Janesville 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 Janesville