"This incident is notable for its rapid expansion to over 158,000 acres and the substantial resources committed—over 800 personnel at peak—before achieving full containment. The high estimated cost and prolonged minimal-phase activity underscore the significant impact of natural fires in the region."
The Tartar wildfire, located 21 miles northwest of Weiser in Washington County, Idaho, was discovered on July 24, 2026 and is a natural fire. By August 6 it had burned 147,418 acres and was 53% contained, with 665 personnel on the scene. The fire grew to 158,027 acres by August 8, reaching 82% containment and 717 personnel, and continued to expand slightly to 158,027 acres by August 9 while containment rose to 87%. By August 11 containment stabilized at 89% and personnel decreased to 459. The fire entered a minimal phase with creeping and smoldering behavior, and containment increased to 93% on August 12, 98% on August 13, and remained at 98% through August 29. Personnel numbers fell steadily, and the fire was fully contained at 100% on September 3, 2026, with a final estimated cost of $25,000,000.
Official source description: 21 Miles NW from Weiser, ID
Minimal; Smoldering; Isolated Torching
Good air quality. Outdoor activity is generally safe near this incident.
Nearest reporting station: Weiser (seasonal). Source: AirNow.gov (EPA).
The fire is now fully contained and behavior is minimal; however, standard wildfire safety precautions remain advised in the area until all fire crews confirm the fire is completely extinguished.
IRWIN ID: {DB5448A6-FCAC-4041-A817-6F8198161DBA}
Discovered: Jul 24, 2026
Cause: Natural
Est. Cost to Date: $25,000,000
Coordinates: 44.5413, -117.093
Other wildfires that have recently been contained or dropped from official tracking in ID.
The Tartar Fire has burned 158,027 acres as of September 3, 2026.
Yes, the Tartar Fire is fully contained (100%).
The official cause has been listed as: Natural.
The Tartar Fire is burning in Washington, ID.
Yes, as of the latest official update, the Tartar Fire remains active.
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