The Sinlahekin Fire in Okanogan County, Washington received its final incident update from the Northwest Interagency Coordination Center on October 6, 2026, with the fire at 94% containment across 166,007 acres. The closure order for affected portions of the Colville National Forest Tonasket Ranger District remains in effect through October 31, 2026.
A Season-Long Battle in Okanogan County
The Sinlahekin Fire ignited in early August 2026 and quickly grew into one of the most significant fire events of the year in north-central Washington, eventually consuming 166,007 acres of timber, litter, and understory on state land northwest of Sinlahekin Campground near Tonasket. At its peak, the fire averaged approximately 2,767 acres of daily growth, driven by hot, dry conditions and erratic winds that plagued the region throughout the summer.
The fire burned primarily through the Sinlahekin Valley and adjacent drainages in Okanogan County, threatening ranches, rural residences, and wildlife habitat. The Sinlahekin Wildlife Area, a critical habitat corridor managed by the Washington Department of Fish and Wildlife, fell within the fire's footprint.
Closures and Restrictions Remain
A forest closure order signed by Colville National Forest Supervisor Joshua White, effective August 13, 2026, remains in place on affected portions of the Tonasket Ranger District through October 31, 2026, unless rescinded earlier. Residents, hikers, and recreationists are urged to check with the Tonasket Ranger District before entering the closure area.
Okanogan County emergency managers note that Level 1 (Advisory), Level 2 (Be Ready), and Level 3 (Evacuate Immediately) evacuation alerts that were issued during the peak of fire activity have all been lifted. Residents who evacuated have been cleared to return to their properties.
Recovery Work Underway
Post-fire rehabilitation work is expected to begin in earnest this fall, with agencies assessing soil stability, watershed conditions, and burned area emergency response (BAER) needs across the affected landscape. Residents in burned drainages are advised to be aware of potential post-fire flooding and debris flow hazards with fall rainfall.