Spontaneous Heating Sparked Blackwell Road Fire
Fire investigators say the 50-acre Central Point fire began accidentally inside a large mulch pile before high winds pushed flames across nearby fuel sources and grass fields.
Blackwell Fire Facts
50 Acres
Start Date: 5/25/2026
Origin:
Hilton Landscape Supply
Cause:
Spontaneous Heating
CENTRAL POINT, Ore. — Investigators say the Blackwell Road Fire that burned 50 acres near Central Point on May 25 was accidental and began from spontaneous heating inside a large mulch pile.
Jackson County Fire District 3 said the fire was first reported at 2:32 p.m. at Hilton Landscape Supply on Blackwell Road. What was initially reported as possible smoke from a mulch pile was quickly confirmed to be an active fire.
According to Fire District 3, strong winds with gusts exceeding 50 mph accelerated the flames, spreading the fire to nearby mulch piles, stacked lumber and landscaping materials in the industrial yard. Crews responded within minutes, but the wind pushed the fire quickly across the property.
A map released by Jackson County Fire District 3 and ODF Southwest Oregon District shows the Blackwell Road Fire perimeter, origin area, spot fires and where forward progress was stopped. Fire officials said the fire burned a combined 50 acres on May 25, 2026. Image courtesy of Jackson County Fire District 3.
A second alarm was called at 3:05 p.m. because of rapid fire growth. The incident was upgraded to a third alarm at 4:04 p.m. as additional resources were brought in.
Around 3:25 p.m., the fire crossed Tolo Road, ignited a power pole and caused downed power lines. Flames then moved into grass fields between Tolo Road and the eastern portion of Blackwell Road, prompting road closures and evacuation alerts for nearby homes.
Fire crews, working with privately owned heavy equipment operators, stopped the fire’s forward progress around 5:30 p.m. Winds did not subside until about 7 p.m. that evening. Crews remained on scene for several days because of deep-seated heat in mulch, vegetation and other materials near the fire’s point of origin.
The fire began on land protected by Fire District 3 before burning into an area protected by the Oregon Department of Forestry Southwest Oregon District. The incident was jointly managed by both agencies, in coordination with the Jackson County Sheriff’s Office and Jackson County Emergency Management.
Fire officials determined the cause was accidental and linked to a natural process known as biological microbial thermogenesis. In that process, microorganisms generate heat as they break down organic material. In tightly packed vegetation piles, that heat can build until the material begins to char and smolder.
Investigators said that if fresh oxygen is suddenly introduced, such as when a pile shifts during strong winds, superheated gases and charred material can ignite and transition from smoldering to open flame.
Fire District 3 said early video showed smoke developing inside the mulch pile before flames appeared. Strong winds then drove flames horizontally, allowing the fire to spread rapidly from the original pile to nearby mulch, BCI joists, also known as I-joists, and other fuels. Embers were carried across the area and beyond Tolo Road into nearby grass and fields.
Fire officials also clarified that no pallets were involved in the Hilton yard area of the fire. BCI joists stored at the facility may have appeared similar to pallets in photos. Officials also said a green metal container near the ignition point was not involved in the fire and was not the source of ignition.
Fire District 3 said the incident shows how quickly wind-driven fires can escalate and how far embers can travel. The agency said it also reinforces the importance of defensible space and reducing fuels around homes and properties.
During the initial response, fire crews were assisted by seven privately owned water tenders and a grader from Central Rock and Redi-Mix, which helped build a containment line on the south edge of the fire. Fire District 3 also acknowledged the Hilton family and their personnel for continuing to operate heavy equipment alongside fire crews during suppression and mop-up efforts.
Fire District 3 said it will work with Hilton to use the experience to strengthen safety measures and enhance fire safety practices across the operation.
The agency also encouraged homeowners to learn more about wildfire risk reduction programs available through Fire District 3.
Cover image: A Jackson County Fire District 3 firefighter watches flames burn through stacked materials at Hilton Landscape Supply during the Blackwell Road Fire on May 25, 2026. Investigators later determined the fire began accidentally from spontaneous heating inside a large mulch pile. Photo courtesy of Jackson County Fire District 3.
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