The Tartar Fire in Washington County, Idaho, has become one of the most dramatic and destructive fires of the 2026 season in the state, burning an estimated 138,271 acres and pushing into the outskirts of the city of Weiser along U.S. Route 95. As of the latest reports, the fire is approximately 41 percent contained, though active behavior with wind-driven runs continues to challenge firefighters.

Fast-Moving Blaze Runs Toward Weiser

The Tartar Fire first drew widespread attention on the evening of August 1, 2026, when it ran approximately 20 miles toward Weiser in a single day — a dramatic rate of spread driven by bone-dry fuels, gusty winds, and temperatures well above 100 degrees Fahrenheit. The fire impacted structures along U.S. Route 95 north of the city, and hay bales were spotted smoldering along Water Tank Road as the fire burned into the Weiser area early on August 2.

The fire is being fueled by dry grasses, brush, and timber, and exhibits active behavior including wind-driven runs and uphill runs. Spot fires ahead of the main fire front have complicated suppression efforts and forced resources to shift priorities rapidly.

Evacuation Orders and Road Closures

Level 3 (Go Now) Evacuation Orders are in effect for areas north and east of Weiser in Washington County. Authorities have urged all residents in the affected zones to leave immediately and not wait to see if conditions improve. U.S. Route 95 has been subject to periodic closures as the fire crossed and re-threatened the highway corridor.

The Washington County Emergency Management office, in coordination with the Idaho Office of Emergency Management, established evacuation shelters and coordinated with the Red Cross to assist displaced residents. Livestock and agricultural operations have been heavily impacted, with ranchers expressing concern about fencing, range land, and herd losses.

Growth Timeline

  • August 2: Fire runs 20 miles overnight, burns into Weiser area, US-95 impacted
  • August 3: Fire size reported at 107,825 acres, 11 percent contained
  • August 4-5: Growth continues, fire reaches 138,223 acres
  • August 6-7: 138,271 acres, containment improves to 41 percent

Multi-Agency Response

The fire is being managed by a multi-agency team drawing resources from BLM, USFS, and state and local agencies. Air resources including tankers and helicopters have been used to support ground operations. The extreme fire weather that drove the initial explosion — with minimum relative humidity values in the single digits and sustained winds of 20 to 30 mph — has eased somewhat, allowing crews to make containment progress on portions of the perimeter.

As of August 7, the fire remains a significant operational challenge. Residents under evacuation orders should not return until officials declare it safe to do so. Current evacuation information for Washington County, Idaho, can be found through the Washington County Sheriff's Office and Idaho Office of Emergency Management.