"The Grotto fire’s rapid growth—from 443 to nearly 3,900 acres in just over a month—demonstrates a high‑rate expansion that strained resources and highlighted the challenges of managing large, wind‑driven fires 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 3,171 acres by August 28 and peaking at 3,849 acres on August 31. The United States Forest Service (USFS) remains the jurisdictional agency, and the cause is undetermined. Fire behavior shifted from moderate backing to active flanking and wind‑driven runs, with intermittent periods of isolated torching. By September 15 the blaze had stabilized at 3,856 acres, achieving 20% containment while still exhibiting minimal creeping activity.
Official source description: 20 Miles E from Lowell, ID
Minimal; Creeping; Wind Driven Runs
Good air quality. Outdoor activity is generally safe near this incident.
Nearest reporting station: Hamilton. Source: AirNow.gov (EPA).
Given the current minimal, creeping behavior and 20% containment, general wildfire safety precautions apply: stay informed of local updates, avoid the fire perimeter, and be prepared to evacuate if conditions worsen.
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 15, 2026.
As of the latest update, the Grotto Fire is 20% 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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