"This incident is notable for its rapid growth from 200 to over 16,000 acres within 48 hours, the extreme fire behavior that required a large firefighting force, and the substantial suppression cost of $3 million."
The Weiser Knoll wildfire, located 13 miles southeast of Lander in Fremont County, Wyoming, was first discovered on August 9, 2026, and is managed by the BLM. The fire rapidly expanded from 200 acres at discovery to a peak of 16,531 acres by August 12, with extreme behavior described as running and short‑range spotting. Containment progressed slowly, reaching 30% on August 12, 51% by the evening of August 12, and 95% by August 13, before finally achieving 100% containment on August 18. Personnel peaked at 201 firefighters early in the outbreak and declined to 14 by the time the fire was fully contained. The estimated cost of suppression efforts reached $3,000,000.
Official source description: 13 Miles SE from Lander, WY
Minimal; Flanking; Isolated Torching
Good air quality. Outdoor activity is generally safe near this incident.
Nearest reporting station: Lander. Source: AirNow.gov (EPA).
The fire is now fully contained and behavior is minimal; standard wildfire safety precautions remain advised in the area.
IRWIN ID: {F544AE86-CD8F-4C07-8D41-EFA39315DE48}
Discovered: Aug 9, 2026
Cause: Undetermined
Managing Agency: BLM
Est. Cost to Date: $3,000,000
Coordinates: 42.6364, -108.6076
Other wildfires that have recently been contained or dropped from official tracking in WY.
The WEISER KNOLL Fire has burned 15,817 acres as of August 18, 2026.
Yes, the WEISER KNOLL Fire is fully contained (100%).
The official cause has been listed as: Undetermined.
The WEISER KNOLL Fire is burning in Fremont, WY.
Yes, as of the latest official update, the WEISER KNOLL Fire remains active.
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