Oregon · incident record
Big Grass Fire, Oregon
578,637
Acres reported
100%
Contained
0
Acres since yesterday
Last updated · refreshed every 15 minutes from the NIFC WFIGS feed · awareness only — follow local authorities
Update ·
As of Sep 13, 2026, 01:00 UTC, the Big Grass Fire is no longer listed in the federal active-fire feed at 578,637 acres, 100% contained, in Malheur County, Oregon.
Since Sep 12, 2026, 01:00 UTC: no change in size, containment +6 pts.
The most recent mapped perimeter (Aug 28, 2026, 03:53 UTC) covers 575,163 acres; the mapped perimeter has been updated 60 times since the fire began.
No satellite heat detections matched to this incident in the last 24 hours (last one Aug 26, 2026, 20:02 UTC).
It was last present in the feed Sep 13, 2026, 01:00 UTC; the largest size reported was 582,226 acres. This page stays up as a record of the incident.
Big Grass Fire map
The most recent mapped perimeter (solid) and the previous day's perimeter (dashed), with the reported point of origin.
Latest perimeter Previous perimeter · Perimeters come from the WFIGS interagency perimeter service and are usually mapped once a day; the mapped area can differ from the reported acreage.
Key facts
- Size
- 578,637 acres
- Containment
- 100%
- Status
- Not in feed (last seen Sep 13, 2026)
- Discovered
- Jul 23, 2026
- Location
- Malheur County, Oregon
- Origin point
- 42.6498, -117.3034
- Peak reported size
- 582,226 acres
- Perimeter mapped
- Aug 28, 2026 (35 days ago)
- Satellite heat, 24 h
- none matched
Nearest towns
Distances are from the reported point of origin, not from the fire’s edge (see the perimeter map for the current extent).
- Marsing, ID
- Homedale, ID
- Nampa, ID
- Kuna, ID
- Wilder, ID
Other fires nearby
No other wildfires listed within 50 miles right now.
Big Grass Fire timeline
Day by day: the largest size and containment reported each UTC day, from our 15-minute archive of the federal feed (first seen Jul 23, 2026, 21:00 UTC).
| Day (UTC) | Reported size | Change | Contained |
|---|---|---|---|
| Sep 13, 2026 | 578,637 acres | 0 | 100% |
| Sep 12, 2026 | 578,637 acres | 0 | 100% |
| Sep 11, 2026 | 578,637 acres | 0 | 94% |
| Sep 10, 2026 | 578,637 acres | 0 | 94% |
| Sep 9, 2026 | 578,637 acres | 0 | 94% |
| Sep 7, 2026 | 578,637 acres | 0 | 94% |
| Sep 6, 2026 | 578,637 acres | 0 | 94% |
| Sep 5, 2026 | 578,637 acres | 0 | 94% |
| Sep 4, 2026 | 578,637 acres | 0 | 94% |
| Sep 3, 2026 | 578,637 acres | 0 | 94% |
| Aug 25, 2026 | 578,637 acres | 0 | 93% |
| Aug 24, 2026 | 578,637 acres | 0 | 93% |
| Aug 23, 2026 | 578,637 acres | −2 | 93% |
| Aug 22, 2026 | 578,639 acres | −368 | 89% |
| Aug 21, 2026 | 579,007 acres | −162 | 85% |
| Aug 20, 2026 | 579,169 acres | 0 | 85% |
| Aug 19, 2026 | 579,169 acres | +35 | 85% |
| Aug 18, 2026 | 579,134 acres | +686 | 82% |
| Aug 17, 2026 | 578,448 acres | −3,778 | 71% |
| Aug 16, 2026 | 582,226 acres | 0 | — |
| Aug 15, 2026 | 582,226 acres | +901 | — |
| Aug 14, 2026 | 581,325 acres | +1,964 | — |
| Aug 13, 2026 | 579,361 acres | +4,018 | — |
| Aug 12, 2026 | 575,343 acres | +21,371 | — |
| Aug 11, 2026 | 553,972 acres | 0 | — |
| Aug 10, 2026 | 553,972 acres | +49,587 | — |
| Aug 9, 2026 | 504,385 acres | +62,069 | — |
| Aug 8, 2026 | 442,316 acres | +51,416 | — |
| Aug 7, 2026 | 390,900 acres | +31,989 | — |
| Aug 6, 2026 | 358,911 acres | +12,233 | — |
| Aug 5, 2026 | 346,678 acres | +4,326 | — |
| Aug 4, 2026 | 342,352 acres | +5,573 | — |
| Aug 3, 2026 | 336,779 acres | +29,261 | — |
| Aug 2, 2026 | 307,518 acres | +3,289 | — |
| Aug 1, 2026 | 304,229 acres | +1,172 | — |
| Jul 31, 2026 | 303,057 acres | +1,485 | — |
| Jul 30, 2026 | 301,572 acres | +13,452 | — |
| Jul 29, 2026 | 288,120 acres | −11,880 | — |
| Jul 28, 2026 | 300,000 acres | +20,000 | — |
| Jul 27, 2026 | 280,000 acres | 0 | — |
| Jul 26, 2026 | 280,000 acres | +150,000 | — |
| Jul 25, 2026 | 130,000 acres | +100,000 | — |
| Jul 24, 2026 | 30,000 acres | +25,000 | — |
| Jul 23, 2026 | 5,000 acres | — | — |
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Big Grass Fire questions, answered from the data
How big is the Big Grass Fire?
As of Sep 13, 2026, 01:00 UTC, the Big Grass Fire is reported at 578,637 acres (peak reported size 582,226 acres). Since Sep 12, 2026, 01:00 UTC: no change in size, containment +6 pts.
Is the Big Grass Fire contained?
Yes — the Big Grass Fire was reported 100% contained as of Sep 13, 2026, 01:00 UTC. Containment means a control line surrounds the fire; interior areas can keep burning for days.
Where is the Big Grass Fire?
The reported point of origin is at 42.6498, -117.3034 in Malheur County, Oregon. Nearest towns: Marsing (67 mi N), Homedale (69 mi N), Nampa (72 mi NE). The map on this page shows the most recent mapped perimeter.
Is the Big Grass Fire still burning?
It is no longer in the federal active-fire feed; it was last listed Sep 13, 2026, 01:00 UTC. Fires drop out of the feed when the incident is closed or handed to local management, not necessarily when every ember is out.
What is the timeline of the Big Grass Fire?
The Big Grass Fire was first listed in the federal feed Jul 23, 2026, 21:00 UTC (reported discovery date Jul 23, 2026). It was last listed Sep 13, 2026, 01:00 UTC, after peaking at 582,226 acres. The timeline table on this page shows the size and containment reported each UTC day across 44 days of archive.
Where do I find evacuation orders for the Big Grass Fire?
From the county sheriff and local emergency management, not from this site. Check the official Oregon sources on our Oregon page and your county’s alert system. FireRiskHere is for awareness only.
How current is this page?
The numbers come from the National Interagency Fire Center's WFIGS incident feed and the WFIGS perimeter service, refreshed every 15 minutes, plus NASA FIRMS satellite detections hourly. This page was last updated Sep 13, 2026, 01:00 UTC. Acreage and containment are what the incident team reports and can lag by hours.
About this page
This page is generated automatically for every wildfire whose reported size reaches 1,000 acres, from FireRiskHere’s archive of the National Interagency Fire Center’s WFIGS incident feed (captured every 15 minutes), the WFIGS interagency perimeter service, and NASA FIRMS satellite detections. It stays online after the fire is contained as a record of the incident. Nothing here is an official notice — for evacuation orders and road closures follow your county sheriff and local emergency management. How the site works →