Big Rock Fire
The Big Rock Fire was reported on July 31, 2026 in Jefferson County, Idaho and burned 2,142 acres. It was declared out on September 1, 2026. The cause is listed as natural.
- Size
- 2,142 acres
- Contained
- 100%
- Discovered
- July 31, 2026
- Personnel
- 3
Map
Perimeter mapped September 17, 2026 at 9:35 AM MDT, 2,142 acres (mixed methods). Point of origin 43.639, -111.664.
The incident
- Size
- 2,142 acres
- Containment
- 100%
- Discovered
- July 31, 2026 at 5:31 PM MDT
- Contained
- August 13, 2026 at 6:00 PM MDT
- Controlled
- August 17, 2026 at 4:30 PM MDT
- Declared out
- September 1, 2026 at 8:00 PM MDT
- Cause
- Natural
- Location
- 20 Miles E from Idaho Falls, ID
- County
- Jefferson County
- State
- Idaho
- Nearest city reported
- Idaho Falls
- Protecting agency
- BLM
- Jurisdiction
- BLM
- Land ownership at origin
- BLM
- Personnel assigned
- 3
- Incident management
- Type 5 IC, Type 2 Incident
- Primary fuel
- Brush (2 feet)
- Estimated cost to date
- $3,530,000
- Incident type
- Wildfire
- Unique fire identifier
- 2026-IDIFD-000152
- IRWIN identifier
- 0BB99778-8D64-476C-BA6A-BC8006391084
Growth
Mapped area at the last perimeter of each day, from August 1, 2026 (968 acres) to September 17, 2026 (2,142 acres). The largest one-day growth was 1,514 acres, mapped August 2, 2026.
| Day | Acres | Change |
|---|---|---|
| August 1, 2026 | 968 | |
| August 2, 2026 | 2,482 | +1,514 |
| August 3, 2026 | 2,199 | -283 |
| August 4, 2026 | 2,188 | -11 |
| August 5, 2026 | 2,149 | -39 |
| September 17, 2026 | 2,142 | -7 |
Weather in the area
This fire is no longer listed as current. The forecast for Ririe, ID covers the area today.
Nearby
Idaho wildfires today Wildfires of 2026 All current fires
Incident record from the National Interagency Fire Center’s Wildland Fire Interagency Geospatial Services (WFIGS), as the incident’s managers report it; last updated September 17, 2026 at 9:35 AM MDT. Identifier 2026-IDIFD-000152.