Mountain Fire

Wildfire in Riverside County, October 2003

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Printed October 28, 2026 from www.firezones.info/fire/5999/mountain-fire-2003

Key facts

Started October 26, 2003
Contained November 8, 2003, after 13 days
Burned 10,331 acres
13th largest fire of 2003
Cause Not recorded
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Where it burned

County

  1. Riverside County 10,331 acres

Community

  1. Sage 3,801 acres

Acres are the land the fire burned in each county and community, and places where it burned less than an acre are not listed. Communities are cities, towns and the unincorporated places the Census Bureau names, so land outside any of them is counted only in its county.

The same land, other fires

Burned before

  1. 1950 Rawson Fire 3,538 acres in total 3,192 acres shared
  2. 1962 Rawson Fire 12,946 acres in total 3,901 acres shared
  3. 1979 Unnamed fire 171 acres in total 164 acres shared
  4. 1982 Rawson Fire 1,757 acres in total · Cause: Equipment use 464 acres shared
  5. 1985 Skinner Fire 675 acres in total · Cause: Equipment use 168 acres shared
  6. 1993 California Fire 24,434 acres in total · Cause: Power lines 2,536 acres shared
  7. 1996 Pony Fire 1,035 acres in total · Cause: Vehicle 625 acres shared

Acres are the land each fire shares with the Mountain Fire, and fires that shared 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 history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Building damage
CAL FIRE Damage Inspection
Updated 19 October 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