Big Mountain Fire
Active
Utah County, Utah · Discovered August 23, 2026
Source: NIFC/IRWIN (interagency) · Last upstream update 8 days ago
Big Mountain Fire
The Big Mountain Fire fire has burned 166 acres in Utah County, Utah. Crews have fully contained the fire. It has shown no measurable growth in the last 24 hours. Air quality near the fire is good (AQI 35). 4 personnel are assigned to the incident.
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Incident timeline
Generated automatically from official feeds the moment they change: size, containment, evacuation zones, aircraft, and incident team updates.
Fire reported 100% contained
26 days ago · September 11, 2026Containment rose to 100%
38 days ago · August 30, 2026Containment rose to 90%
39 days ago · August 29, 2026Containment rose to 80%
40 days ago · August 29, 2026Containment rose to 70%
41 days ago · August 28, 2026Containment rose to 50%
42 days ago · August 27, 2026Containment rose to 29%
43 days ago · August 25, 2026Containment rose to 10%
44 days ago · August 24, 2026Mapped size revised down to 166 acres (from 400)
44 days ago · August 24, 2026Containment dropped to 0% (from 100%)
45 days ago · August 24, 2026Grew 100 acres in 3 hours to 400 acres
45 days ago · August 24, 2026Grew 270 acres in about an hour to 300 acres
45 days ago · August 23, 2026Fire first listed in official incident feeds at 30 acres
45 days ago · August 23, 2026
Raw growth & containment readings
| Recorded | Size | Contained |
|---|---|---|
| 9/11/2026, 5:07:19 PM | 166 acres | 100% |
| 8/30/2026, 10:45:02 PM | 166 acres | 100% |
| 8/29/2026, 9:32:56 PM | 166 acres | 90% |
| 8/29/2026, 12:43:51 AM | 166 acres | 80% |
| 8/28/2026, 12:30:20 AM | 166 acres | 70% |
| 8/27/2026, 12:01:24 AM | 166 acres | 50% |
| 8/25/2026, 11:01:17 PM | 166 acres | 29% |
| 8/24/2026, 11:44:04 PM | 166 acres | 10% |
| 8/24/2026, 1:58:34 AM | 400 acres | 0% |
| 8/23/2026, 11:15:22 PM | 300 acres | - |
| 8/23/2026, 11:00:21 PM | 30 acres | - |
Recorded by Fire Nearby each time upstream data changes.
About this data
Fire Nearby aggregates official incident data and shows exactly when each value was last updated. For evacuation decisions, always follow instructions from local emergency officials and check county emergency management channels.