Big Grass Fire
No longer in current feed
Malheur County, Oregon · Discovered July 23, 2026
Source: NIFC/IRWIN (interagency) · Last upstream update 40 days ago
Big Grass Fire
The Big Grass Fire fire has burned 578,637 acres in Malheur County, Oregon. It is no longer in the current official feed, so the figures on this page reflect the last data reported. Crews have fully contained the fire. Air quality near the fire is good (AQI 45). 124 personnel are assigned to the incident.
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Big Grass Fire size over time
15 official size readingsGrew from 554K to 579K acres across these reports.
Acreage as reported by the official incident feed, recorded by Fire Nearby each time it changes. Hover or tap the chart for each reading.
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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
54 days ago · September 17, 2026Containment rose to 100%
59 days ago · September 12, 2026New perimeter mapped at 575,163 acres (national perimeter feed)
67 days ago · September 4, 2026Containment rose to 94%
73 days ago · August 29, 2026Containment rose to 89%
81 days ago · August 22, 2026Mapped size revised down to 578,639 acres (from 579,007)
82 days ago · August 21, 2026Mapped size revised down to 579,007 acres (from 579,134)
83 days ago · August 20, 2026Containment rose to 82%
85 days ago · August 18, 2026Grew 686 acres in 48 hours to 579,134 acres
85 days ago · August 18, 2026Containment rose to 72%
87 days ago · August 16, 2026Mapped size revised down to 578,448 acres (from 582,226)
87 days ago · August 16, 2026Grew 901 acres in 24 hours to 582,226 acres
88 days ago · August 15, 2026Containment rose to 54%
89 days ago · August 14, 2026Grew 1,964 acres in 24 hours to 581,325 acres
89 days ago · August 14, 2026Grew 4,018 acres in 22 hours to 579,361 acres
90 days ago · August 13, 2026Grew 21,371 acres in 14 hours to 575,343 acres
91 days ago · August 12, 2026Fire first listed in official incident feeds at 553,972 acres
91 days ago · August 11, 2026Official incident page published on InciWeb: Big Grass Fire
105 days ago · July 28, 2026
Raw growth & containment readings
| Recorded | Size | Contained |
|---|---|---|
| 9/12/2026, 11:16:49 PM | 578,637 acres | 100% |
| 8/29/2026, 11:56:42 PM | 578,637 acres | 94% |
| 8/23/2026, 1:26:20 AM | 578,637 acres | 93% |
| 8/22/2026, 1:45:44 AM | 578,634 acres | 89% |
| 8/21/2026, 12:27:26 AM | 578,639 acres | 85% |
| 8/20/2026, 1:09:17 AM | 579,007 acres | 85% |
| 8/19/2026, 1:05:05 AM | 579,169 acres | 85% |
| 8/18/2026, 1:09:10 AM | 579,134 acres | 82% |
| 8/17/2026, 4:26:42 PM | 578,422 acres | 71% |
| 8/16/2026, 1:16:32 AM | 578,448 acres | 72% |
| 8/15/2026, 1:43:57 AM | 582,226 acres | 55% |
| 8/14/2026, 1:48:09 AM | 581,325 acres | 54% |
| 8/13/2026, 1:47:03 AM | 579,361 acres | 34% |
| 8/12/2026, 3:54:25 AM | 575,343 acres | 36% |
| 8/11/2026, 2:04:22 PM | 553,972 acres | 35% |
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.