Lost Girl Fire
The Lost Girl Fire was reported on August 31, 2025 in Sanders County, Montana and burned 309 acres. It was declared out on December 11, 2025. The cause is listed as natural.
- Size
- 309 acres
- Contained
- Not reported
- Discovered
- August 31, 2025
Map
Perimeter mapped December 12, 2025 at 10:54 AM MST, 309 acres (ir image interpretation). Point of origin 48.113, -115.711.
The incident
- Size
- 309 acres
- Containment
- Not reported
- Discovered
- August 31, 2025 at 7:23 PM MDT
- Contained
- November 24, 2025 at 11:00 AM MST
- Controlled
- November 24, 2025 at 12:00 PM MST
- Declared out
- December 11, 2025 at 12:00 PM MST
- Cause
- Natural
- County
- Sanders County
- State
- Montana
- Protecting agency
- USFS
- Jurisdiction
- USFS
- Land ownership at origin
- USFS
- Incident management
- Type 5 Incident
- Incident type
- Wildfire
- Unique fire identifier
- 2025-MTKNF-000319
- IRWIN identifier
- B31EBF46-7EA5-4CC9-85AB-098EFE57B6EE
Growth
Mapped area at the last perimeter of each day, from September 5, 2025 (57 acres) to December 12, 2025 (309 acres). The largest one-day growth was 96 acres, mapped September 16, 2025.
| Day | Acres | Change |
|---|---|---|
| September 5, 2025 | 57 | |
| September 7, 2025 | 71 | +14 |
| September 9, 2025 | 88 | +17 |
| September 11, 2025 | 109 | +21 |
| September 12, 2025 | 123 | +14 |
| September 16, 2025 | 218 | +95 |
| September 17, 2025 | 240 | +22 |
| September 19, 2025 | 243 | +3 |
| September 21, 2025 | 266 | +23 |
| September 23, 2025 | 272 | +6 |
| September 24, 2025 | 280 | +8 |
| September 25, 2025 | 283 | +3 |
| September 26, 2025 | 289 | +6 |
| September 27, 2025 | 302 | +13 |
| December 12, 2025 | 309 | +7 |
Weather in the area
This fire is no longer listed as current. The forecast for Pioneer Junction, MT covers the area today.
Nearby
- Pioneer Junction, MT18 miles northeast of the fire’s origin
- Libby, MT20 miles north of the fire’s origin
- Thompson Falls, MT40 miles southeast of the fire’s origin
- Ponderay, ID40 miles west of the fire’s origin
- Sandpoint, ID40 miles west of the fire’s origin
- Kellogg, ID44 miles southwest of the fire’s origin
Montana wildfires today Wildfires of 2025 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 August 30, 2026 at 11:34 AM MDT. Identifier 2025-MTKNF-000319.