Two of Washington State's largest wildfires of 2026 are nearing full containment this week, offering some relief after a punishing summer season that saw hundreds of structures damaged or destroyed across north-central Washington.

Little Giant Fire: 172,896 Acres, 93% Contained

The Little Giant Fire, burning on the Okanogan-Wenatchee National Forest roughly 30 miles northwest of Leavenworth in Chelan County, has grown to approximately 172,896 acres over its 77-day run — an average expansion of more than 2,200 acres per day at its peak. As of the most recent National Interagency Fire Center situation report, the fire is 93% contained, with crews managing smoldering, creeping, and backing behavior in timber and dormant brush.

A Type 1 Complex Incident Management Team (NW Team 12) has been managing the incident. Area, road, and trail closures remain in effect within and around the fire perimeter. Structures remain threatened in several drainages, and fire managers are warning that residual hot spots could remain active for weeks as crews work toward full containment.

Sinlahekin Fire: 166,007 Acres, 99% Contained

The Sinlahekin Fire in Okanogan County — managed by the Washington Department of Natural Resources Northeast Region — has also nearly reached full containment at 99%. The fire burned 166,007 acres through the Sinlahekin Valley, a region known for its wildlife habitat and rural ranching communities.

Earlier this season, the Sinlahekin and related fires contributed to Washington's worst structural loss event of 2026, with more than 600 structures damaged or destroyed across the state during an August outbreak that prompted NWS to issue a rare Particularly Dangerous Situation Red Flag Warning over eastern Washington and Oregon.

Ptarmigan Fire Still Active at 25%

A third significant Okanogan County fire — the Ptarmigan Fire at 25,166 acres — remains 75% contained and continues to require active suppression efforts. Fire behavior has moderated significantly with the onset of autumn conditions, though the fire is not yet out.

What Comes Next

With October bringing shorter days, lower sun angles, and the first hints of fall precipitation, fire managers say Energy Release Component (ERC) values have dropped significantly across the Northwest. This natural transition is aiding mop-up operations, though crews warn the public to remain vigilant near active fire areas where smoke, hazard trees, and rolling debris can pose risks long after flames are no longer visible.

  • Area and road closures remain in effect on Okanogan-Wenatchee NF
  • Smoke may still be present in low-lying valleys during morning hours
  • Residents returning to evacuated areas should check with county officials before re-entry
  • Hazard trees along roadsides within burn areas pose an ongoing safety risk

Full containment of both the Little Giant and Sinlahekin fires is expected within the coming week, barring a return of strong, dry wind events.