Wyoming · incident record
Weiser Knoll Fire, Wyoming
15,817
Acres reported
95%
Contained
0
Acres since yesterday
Last updated · refreshed every 15 minutes from the NIFC WFIGS feed · awareness only — follow local authorities
Update ·
As of Aug 18, 2026, 19:45 UTC, the Weiser Knoll Fire is no longer listed in the federal active-fire feed at 15,817 acres, 95% contained, in Fremont County, Wyoming.
No change in reported size or containment since Aug 17, 2026, 19:45 UTC.
The most recent mapped perimeter (Aug 14, 2026, 12:59 UTC) covers 15,817 acres; the mapped perimeter has been updated 3 times since the fire began.
No satellite heat detections matched to this incident in the last 24 hours (last one Aug 11, 2026, 03:23 UTC).
It was last present in the feed Aug 18, 2026, 19:45 UTC; the largest size reported was 16,531 acres. This page stays up as a record of the incident.
Weiser Knoll 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
- 15,817 acres
- Containment
- 95%
- Status
- Not in feed (last seen Aug 18, 2026)
- Discovered
- Aug 9, 2026
- Location
- Fremont County, Wyoming
- Origin point
- 42.6364, -108.6076
- Peak reported size
- 16,531 acres
- Perimeter mapped
- Aug 14, 2026 (49 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).
- Lander, WY
- Arapahoe, WY
- Ethete, WY
- Fort Washakie, WY
- Riverton, WY
Other fires nearby
No other wildfires listed within 50 miles right now.
Weiser Knoll 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 Aug 9, 2026, 20:45 UTC).
| Day (UTC) | Reported size | Change | Contained |
|---|---|---|---|
| Aug 18, 2026 | 15,817 acres | 0 | 95% |
| Aug 17, 2026 | 15,817 acres | 0 | 95% |
| Aug 16, 2026 | 15,817 acres | 0 | — |
| Aug 15, 2026 | 15,817 acres | −714 | — |
| Aug 14, 2026 | 16,531 acres | 0 | — |
| Aug 13, 2026 | 16,531 acres | 0 | — |
| Aug 12, 2026 | 16,531 acres | +3,181 | — |
| Aug 11, 2026 | 13,350 acres | 0 | — |
| Aug 10, 2026 | 13,350 acres | +10,350 | — |
| Aug 9, 2026 | 3,000 acres | — | — |
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Weiser Knoll Fire questions, answered from the data
How big is the Weiser Knoll Fire?
As of Aug 18, 2026, 19:45 UTC, the Weiser Knoll Fire is reported at 15,817 acres (peak reported size 16,531 acres). No change in reported size or containment since Aug 17, 2026, 19:45 UTC.
Is the Weiser Knoll Fire contained?
Not fully. It was 95% contained as of Aug 18, 2026, 19:45 UTC. Containment is the share of the fire's edge that has a control line; it is reported by the incident team and can lag the ground situation.
Where is the Weiser Knoll Fire?
The reported point of origin is at 42.6364, -108.6076 in Fremont County, Wyoming. Nearest towns: Lander (15 mi NW), Arapahoe (23 mi N), Ethete (28 mi N). The map on this page shows the most recent mapped perimeter.
Is the Weiser Knoll Fire still burning?
It is no longer in the federal active-fire feed; it was last listed Aug 18, 2026, 19:45 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 Weiser Knoll Fire?
The Weiser Knoll Fire was first listed in the federal feed Aug 9, 2026, 20:45 UTC (reported discovery date Aug 9, 2026). It was last listed Aug 18, 2026, 19:45 UTC, after peaking at 16,531 acres. The timeline table on this page shows the size and containment reported each UTC day across 10 days of archive.
Where do I find evacuation orders for the Weiser Knoll Fire?
From the county sheriff and local emergency management, not from this site. Check the official Wyoming sources on our Wyoming 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 Aug 18, 2026, 19:45 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 →