Boundary Fire
202197,976 acresIdaho
The Boundary Fire burned 97,976 acres, about 153 square miles, across 2 counties. It began on August 10, 2021.
Watch how it happenedBoundary Fire · 2021
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 |
|---|---|---|
| Highmost vegetation consumed, soils altered | 19% | 19,039 |
| Moderatemixed: many trees killed, some survive | 33% | 32,561 |
| Lowsurface fire, most trees survive | 33% | 32,743 |
| Unburned to lowislands inside the perimeter, little change | 14% | 13,388 |
| Not mappedcloud, shadow or water in the satellite images | 0.2% | 225 |
19% of the area inside the perimeter burned at high severity, about 19,039 acres; 53% burned at moderate or high 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.
| Custer County | ID | 71,964 |
| Valley County | ID | 26,040 |
Other large fires in Idaho in 2021
- Shovel Creek Fire109,743 acres
- Trail Creek Fire62,475 acres
- Dixie Fire45,239 acres
Monitoring Trends in Burn Severity (USGS and U.S. Forest Service). Type recorded: Wildfire.