ZIP code 91978

San Diego County, including Spring Valley and Jamul

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Report created October 27, 2026 at www.firezones.info/zip/91978

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    26% Very High

    Most 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

    87% has burned

    Most recently the 2025 Lodge Fire, which burned 77 acres here, one of 25 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    83% Elevated · 4% 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 2,029 acres · 1,706 state, 324 local 26%
  2. High 89 acres · 8 state, 81 local 1%
  3. Moderate 93 acres · <1 state, 93 local 1%
  4. Non-wildland 329 acres · Local Responsibility Area 4%
  5. Not mapped by CAL FIRE 5,123 acres · Mostly federal land 67%

7,664 acres of land in all, 1,714 in the State Responsibility Area and 827 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. 1985 Miller Fire Of 8,270 acres in all · Cause: Miscellaneous 4,956 acres
  2. 1970 Laguna Fire Of 174,162 acres in all · Cause: Campfire 4,880 acres
  3. 2007 Harris 2 Fire Of 90,728 acres in all 4,562 acres
  4. 1911 Unnamed fire Of 10,394 acres in all · Cause: Miscellaneous 3,824 acres
  5. 1950 Wet Back Fire Of 3,955 acres in all 2,959 acres
  6. 1999 Proctor Fire Of 1,460 acres in all · Cause: Arson 1,139 acres
  7. 1958 San Miguel Fire Of 975 acres in all 358 acres
  8. 1945 Unnamed fire Of 708 acres in all 316 acres
  9. 1926 Unnamed fire Of 10,371 acres in all · Cause: Miscellaneous 309 acres
  10. 1998 Jamacha Fire 148 acres

And 15 smaller fires. In all, 6,703 acres of ZIP code 91978 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 91978

Neighboring ZIP codes

  1. 91978 26% Very High · this area
  2. 91902 24% Very High
  3. 91914 53% Very High
  4. 91935 82% Very High
  5. 91941 7% Very High
  6. 91977 29% Very High
  7. 92019 59% Very High