"The fire’s rapid growth to nearly 4,000 acres in just over a month, combined with the deployment of a single personnel unit and a rising containment percentage, highlights the challenges of managing large, wind‑driven wildfires in remote areas."
The Grotto wildfire, located 20 miles east of Lowell, Idaho, was first reported on August 10, 2026, covering 443 acres with no containment. Over the following weeks the fire expanded rapidly, reaching 3,849 acres by August 31 and remaining at that size through September 22. The United States Forest Service (USFS) is the jurisdictional agency, and the cause remains undetermined. Fire behavior shifted from moderate backing to active flanking and wind‑driven runs, with occasional isolated torching. Containment began at 20% on September 15 and increased to 50% by September 22, while personnel remained at one throughout the timeline.
Official source description: 20 Miles E from Lowell, ID
Minimal; Smoldering; Wind Driven Runs
Good air quality. Outdoor activity is generally safe near this incident.
Nearest reporting station: Hamilton. Source: AirNow.gov (EPA).
With the fire currently minimal, smoldering, and 50% contained, general wildfire safety precautions apply. Residents should remain vigilant for potential flare‑ups and follow any local advisories.
IRWIN ID: {687D3124-6031-4C95-B574-6AFB110FD389}
Discovered: Jul 29, 2026
Cause: Undetermined
Managing Agency: USFS
Est. Cost to Date: $6,000
Coordinates: 46.2559, -115.0937
Other wildfires that have recently been contained or dropped from official tracking in ID.
The Grotto Fire has burned 3,856 acres as of September 22, 2026.
As of the latest update, the Grotto Fire is 50% contained.
The official cause has been listed as: Undetermined.
The Grotto Fire is burning in Idaho, ID.
Yes, as of the latest official update, the Grotto Fire remains active.
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