"The fire’s rapid early growth to 3,000 acres and the substantial resources—up to 85 personnel and a $1,000,000 estimated cost—highlight its significance within the region’s wildfire season."
The Coldwater wildfire, located in Cassia County, Idaho, was first discovered on August 28, 2026, and remains active. Initial reports indicated a rapid expansion from 2,000 acres to 3,000 acres within the first hour, before stabilizing at 1,900 acres later that day. By 23:40 on August 28, containment reached 70% with 85 personnel on the scene, and the fire behavior was described as moderate, smoldering, and flanking. Containment improved to 85% the following day with 80 personnel, and the fire was fully contained by August 30, 2026, with 74 personnel remaining; the estimated cost rose to $1,000,000. The incident remains under jurisdiction of an unspecified agency, and the cause is undetermined.
Official source description: 20 Miles SW from American Falls, ID
Minimal; Smoldering; Flanking
Good air quality. Outdoor activity is generally safe near this incident.
Nearest reporting station: Pocatello. Source: AirNow.gov (EPA).
The fire is currently fully contained and exhibiting minimal behavior; standard wildfire safety precautions remain advised for the surrounding area.
IRWIN ID: {F1DB1E94-7FA2-4CA3-BD95-C0FABD94FCA8}
Discovered: Aug 28, 2026
Cause: Undetermined
Est. Cost to Date: $1,000,000
Coordinates: 42.5755, -113.0677
Other wildfires that have recently been contained or dropped from official tracking in ID.
The Coldwater Fire has burned 1,539 acres as of August 31, 2026.
Yes, the Coldwater Fire is fully contained (100%).
The official cause has been listed as: Undetermined.
The Coldwater Fire is burning in Cassia, ID.
No, the Coldwater Fire is no longer listed as active by NIFC.
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