Colwash Fire Nearly Quadruples to 34,700 Acres as Evacuations Push Into Benton County

The Colwash Fire nearly quadrupled in size overnight, growing from an estimated 8,000 acres when it broke out Saturday morning to more than 34,700 acres by Sunday, according to National Interagency Fire Center figures reported by AppleValleyNewsNow. The fire remains at zero percent containment, and Level 3 "go now" evacuation orders that began in a narrow stretch of Yakima County southwest of Mabton have since expanded across the county line into western Benton County, south of Prosser. At 34,733 acres, the burn scar is now more than 54 square miles, in country that was open farmland and rangeland little more than a day earlier.

The blaze ignited around 8 a.m. Saturday southwest of Mabton, according to the Yakima Herald-Republic, roughly two miles northeast of BIA Road 15 and 196 outside Toppenish, according to AppleValleyNewsNow. No agency has publicly identified a cause. By Sunday the fire had burned across two counties, prompted a shelter to open in Prosser, closed a stretch of state highway, and pulled state firefighting resources away from a wider slate of fires burning across Washington this weekend.

How a Saturday Morning Ignition Became a Two-County Emergency

Fire crews and law enforcement were dispatched to a report of smoke southwest of Mabton shortly before 8 a.m. Saturday. Within hours, what officials initially described as a roughly 700-acre "new start" had grown to an estimated 8,000 acres, according to a post from wildfire tracking account The Hotshot Wake Up that matched early sheriff's office reporting. Sage brush, heavy grass and dry range fuels across the Yakima Valley floor let the fire move fast in both directions along Highway 22, and by Saturday evening it had already forced the first "go now" evacuation notices in the Mabton area.

The fire kept growing through the night rather than slowing with the cooler overnight hours, which is itself notable; range fires in the Yakima Valley more typically calm somewhat after sunset as relative humidity rises. By Sunday, NIFC's tally put the fire at 34,733 acres, an increase of more than 26,000 acres since the first size estimates a day earlier. No agency has yet released a formal containment percentage, and fire managers have not said publicly how many personnel or aircraft are currently assigned to the incident, though local reporting confirms engines, fire crews and aircraft were actively working the fire perimeter through the weekend. A roughly fourfold increase in size over about a day is consistent with the wind-driven runs that have defined fire behavior across Washington all summer.

Where the "Go Now" Line Sits Today

The Level 3 evacuation zone now spans two counties. In Yakima County, it covers the area along Highway 22 from Glade Road south to the Klickitat County line, and along Glade Road east to the Benton County line, according to KIRO 7. Once the fire crossed into Benton County, officials issued a new Level 3 order for the area east of the county line, south of Highway 22, south and west of State Route 221, and north of Sellards Road, according to AppleValleyNewsNow, effectively putting the rural country south of Prosser under an immediate evacuation order less than a day after the fire started dozens of miles away.

Areas just outside that perimeter carry lower-level warnings that can still change quickly. The area north of Highway 22 in the Mabton area sits at Level 2 "be set," meaning residents there should have vehicles loaded, pets caged and be ready to leave with little notice, while the area east of Glade Road carries the lighter Level 1 "be ready" advisory. Reporting on the precise boundaries has shifted between outlets over the course of the weekend as the fire has moved, which is typical of a fast-growing incident where county emergency management updates outpace news cycles. Residents in either county should treat direct notifications from Yakima County or Benton County emergency management, not news coverage, as the authoritative source for their specific address, and sign up for county alert systems if they have not already.

Highway 22 Closed, Shelter Opens in Prosser

Washington State Patrol closed Highway 22 between Byron Road and Ward Gap Road, roughly milepost 29 to 31, cutting off a stretch fire crews are using as a control line and evacuation route, according to AppleValleyNewsNow. Sellards Road is also closed between Bert James Road and the Benton-Yakima county line, and Lincoln Road is closed at the Prosser city limits. Drivers anywhere in the Lower Yakima Valley should expect detours and build in extra travel time on any route touching the Prosser-Mabton corridor, particularly since the closures sit on roads locals use as through-routes between the two counties.

The American Red Cross opened an evacuation shelter at Prosser High School, 1500 Paterson Road, for residents displaced by the fire. Separately, the fire's early spread knocked out power to more than 800 customers in Grandview on Saturday; utility crews restored service by 7 p.m. that evening, according to the Yakima Herald-Republic. No injuries have been reported in connection with the fire as of Sunday, and no official count of homes or structures lost has been released, though multiple outlets confirm the fire is actively threatening homes, agricultural infrastructure and cultural sites within the burn area. Given how quickly the acreage figure has moved, that structure count is likely to be one of the first hard numbers to change as damage assessment teams get access behind the fire line.

The State Escalates Its Response

Washington State Patrol Chief John Baptiste authorized the mobilization of state firefighting resources at 5 p.m. Saturday, according to a press release from the Washington State Fire Marshal's Office cited by the Yakima Herald-Republic. Five wildland strike teams, a mobilization unit typically built around five engines and a crew apiece, were dispatched to the fire under that authorization. The Washington State Emergency Operations Center at Camp Murray moved to full activation over the weekend as officials tracked Colwash alongside other active fires around the state.

Colwash is not the only fire drawing on that same pool of resources. In Kittitas County, the lightning-caused Three Queens Fire had grown to 6,379 acres and was only 2% contained as of Sunday, with 160 personnel assigned and a large section of the Okanogan-Wenatchee National Forest, including part of the Pacific Crest Trail, closed around it. State-level mobilization is not routine; it is reserved for fires that either overwhelm local and regional capacity or threaten to. That the state activated its full mobilization framework for Colwash on the same weekend its emergency apparatus was already committed to a separate, actively growing fire in Kittitas County signals how thin Washington's firefighting capacity has run by late August, and how much local agencies in Yakima and Benton counties are now competing for state help rather than simply requesting it.

A Second Summer of Explosive Fire Growth

Colwash is not an isolated event. It lands roughly three weeks after the Old Trails Fire tore through northwest Spokane, destroying 640 structures on its own and contributing to roughly 921 structures lost across the broader Spokane Complex Fire, which also forced more than 60,000 evacuations and prompted a direct call between Governor Bob Ferguson and President Trump over federal disaster support. That fire was sparked by arson; a 37-year-old man was later arrested and booked into Spokane County jail. Colwash's cause, by contrast, has not been publicly identified, and nothing reported so far points to arson, while the Three Queens Fire in Kittitas County has been attributed to lightning. Three different fires, three different origin stories, all within the same summer.

What connects them is speed, not cause. Old Trails, Three Queens and now Colwash have each gone from a contained-sounding initial size to a multi-thousand-acre emergency inside a single burn period, on fuels made unusually receptive by a dry summer across the state. Earlier this month, Washington officials publicly debated whether wildfire-prevention grant funding had been slowed by unrelated policy fights, in the same week Spokane was burning. Watching a second, then a third fire quadruple in size overnight in completely different parts of the state argues that the underlying conditions this season, not any single agency's response time or any one funding dispute, are what is driving the pace of these fires. For Washington readers well outside the Yakima Valley, that is the more consequential story than any single fire's acreage: the state's fire behavior this August has consistently outrun the evacuation notices meant to keep pace with it.

What Yakima and Benton County Residents Need to Know Now

Anyone inside the Level 3 zones south of Prosser or southwest of Mabton should leave immediately if they have not already; those areas are under an active "go now" order, not a warning that allows time to prepare. Residents in Level 1 or Level 2 areas nearby should keep vehicles fueled and loaded and monitor Yakima County and Benton County emergency alerts directly, since the fire's footprint has changed multiple times since Saturday morning and the exact zone boundaries are the fastest-moving detail in this story. County alert systems, not social media aggregation or even same-day news coverage, will reflect boundary changes fastest.

Displaced residents can reach the Red Cross shelter at Prosser High School, 1500 Paterson Road. Drivers should avoid Highway 22 between Byron Road and Ward Gap Road, Sellards Road near the Benton-Yakima county line, and Lincoln Road at the Prosser city limits until further notice, and should plan alternate routes for any regular travel through the Lower Yakima Valley in the coming days. With containment still at zero percent, state resources already committed to at least one other actively growing fire in Kittitas County, and no structure-loss figures yet released, residents in the fire's path should plan for the current evacuation orders to remain in place, and potentially expand further, through at least the coming week. Anyone with livestock, farm equipment or other property inside the warning zones should coordinate moves early, since road closures on both sides of the county line will make last-minute evacuation of large animals or heavy equipment far harder once conditions worsen.