Simi Fire
2003107,745 acresCalifornia
The Simi Fire burned 107,745 acres, about 168 square miles, across 2 counties. It began on October 25, 2003.
Watch how it happenedSimi Fire · 2003
How it happened
Watch it burn in the order satellites saw it, coloured by how severely each place burned.
How severely it burned
Burn severity inside the final perimeter, classified from Landsat images taken before and after the fire.
| Severity | Share | Acres |
|---|---|---|
| Moderatemixed: many trees killed, some survive | 19% | 20,745 |
| Lowsurface fire, most trees survive | 31% | 33,087 |
| Unburned to lowislands inside the perimeter, little change | 40% | 43,038 |
| Increased greennessvegetation greener after the fire than before | 10% | 10,876 |
No part of the fire was classed as high severity; 19% burned at moderate severity.
Monitoring Trends in Burn Severity (U.S. Geological Survey and USDA Forest Service). Classes come from the change in a Landsat burn index (dNBR) between images before and after the fire; acres are each class’s share of the fire’s mapped area.
Where it burned
Acres inside each county, measured from the satellite-mapped perimeter.
| Ventura County | CA | 85,280 |
| Los Angeles County | CA | 22,475 |
Other large fires in California in 2003
- Cedar Fire268,142 acres
- Old Fire90,111 acres
- Piru Fire63,923 acres
- Paradise Fire55,956 acres
- Grand Prix Fire50,755 acres
- Mine/Otay Fire39,392 acres
Monitoring Trends in Burn Severity (USGS and U.S. Forest Service). Type recorded: Wildfire.