"The fire’s rapid growth from 50 to 124 acres in just over a day, combined with a high containment rate achieved in a short period, highlights effective firefighting response and resource allocation."
The Chalk Mountain wildfire, located in Carbon County, Wyoming, was first discovered on August 26, 2026, and is currently active under the jurisdiction of the BLM. The fire began with 50 acres and grew to 124 acres by August 27, 2026, when it was reported as active and 75% contained with 35 personnel on the scene. By August 28, containment increased to 91% and the fire behavior shifted to minimal, smoldering, with 30 personnel remaining. The incident remains undetermined in cause and has an estimated cost of $300,000.
Official source description: 35 Miles NW from Medicine Bow, WY
Minimal; Smoldering
Follow general wildfire safety guidance; stay informed of local advisories and avoid the area if conditions worsen.
IRWIN ID: {037447D6-7823-4F82-9B3C-9D56082AA870}
Discovered: Aug 26, 2026
Cause: Undetermined
Managing Agency: BLM
Est. Cost to Date: $300,000
Coordinates: 42.3801, -106.5024
Other wildfires that have recently been contained or dropped from official tracking in WY.
The Chalk Mountain Fire has burned 124 acres as of August 28, 2026.
As of the latest update, the Chalk Mountain Fire is 91% contained.
The official cause has been listed as: Undetermined.
The Chalk Mountain Fire is burning in Carbon, WY.
No, the Chalk Mountain Fire is no longer listed as active by NIFC.
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