ZIP code 95391

Alameda and San Joaquin counties, including Mountain House

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Report created October 27, 2026 at www.firezones.info/zip/95391

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    61% High

    Most of the 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

    26% has burned

    Most recently the 2024 Flynn Fire, which burned 73 acres here, one of 21 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    Not elevated

    Outside the CPUC High Fire-Threat District, though a shutoff can still reach homes whose lines run through it.

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Land by hazard class

  1. High 10,762 acres · 10,541 state, 221 local 61%
  2. Moderate 1,087 acres · 326 state, 760 local 6%
  3. Non-wildland 5,401 acres · Local Responsibility Area 31%
  4. Not mapped by CAL FIRE 257 acres · Mostly federal land 1%

17,506 acres of land in all, 10,868 in the State Responsibility Area and 6,382 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. 1959 Marciel Fire 1,295 acres
  2. 1970 Wprr #9 Fire Of 1,533 acres in all 1,126 acres
  3. 1992 Flowind Fire Of 812 acres in all · Cause: Equipment use 696 acres
  4. 1951 Dry Creek Fire Of 1,078 acres in all 694 acres
  5. 2005 Bruns Fire 444 acres
  6. 2010 Diablo Fire Of 459 acres in all 338 acres
  7. 1988 Altamont #1 - 6 Fire Of 384 acres in all · Cause: Equipment use 237 acres
  8. 2018 Grant Fire Of 632 acres in all · Cause: Miscellaneous 216 acres
  9. 2005 Byron Fire Of 203 acres in all 174 acres
  10. 1962 W.p.r.r. Co. #1 Fire Of 165 acres in all 142 acres

And 11 smaller fires. In all, 4,512 acres of ZIP code 95391 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 95391

Neighboring ZIP codes

  1. 95391 61% High · this area
  2. 94505 2% Moderate
  3. 94514 60% High
  4. 94550 74% Very High
  5. 94551 10% Very High
  6. 95206 No hazard zones
  7. 95304 22% Very High
  8. 95377 15% Very High