CENTRAL POINT, Ore. (May. 29, 2026) — Investigators have determined that the 50-acre Blackwell Fire that burned near Central Point on May 25 was caused by spontaneous ignition within a large mulch pile, with powerful winds helping drive the fire’s rapid spread across an industrial area and nearby grasslands.
According to an investigation update released Thursday by Jackson County Fire District 3, the fire was reported at approximately 2:32 p.m. at Hilton Landscape Supply on Blackwell Road. Initial reports suggested smoke was coming from a mulch pile, but firefighters quickly confirmed an active fire burning within the facility.
Strong winds, with gusts exceeding 50 mph, fueled the blaze and pushed flames through nearby mulch piles, stacked lumber products and landscaping materials. Fire crews arrived within minutes, but officials said the extreme wind conditions caused flames to spread rapidly across the property.
As conditions worsened, incident commanders requested a second alarm at 3:05 p.m. and upgraded the response to a third alarm at 4:04 p.m. as additional resources were deployed.
Around 3:25 p.m., the fire crossed Tolo Road, igniting a power pole and causing downed electrical lines. The blaze then spread into grass fields between Tolo Road and the eastern portion of Blackwell Road, prompting road closures and evacuation alerts for nearby residents.
Firefighters, assisted by privately owned heavy equipment operators, were able to halt the fire’s forward progress by approximately 5:30 p.m. However, winds remained strong until about 7 p.m., and crews continued mop-up operations for several days because of deep-seated heat remaining in mulch piles, vegetation and other materials near the fire’s point of origin.
The fire originated within an area protected by Jackson County Fire District 3 before spreading into land protected by the Oregon Department of Forestry’s 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.
Investigators concluded the fire was accidental and caused by a natural process known as biological microbial thermogenesis. The phenomenon occurs when microorganisms generate heat while decomposing organic material. In tightly packed vegetation or mulch piles, that heat can accumulate faster than it dissipates, eventually leading to smoldering combustion.
Officials said that as the internal temperature of the mulch pile increased, chemical oxidation processes took over, causing portions of the material to char and smolder. When strong winds introduced fresh oxygen into the pile, the superheated gases and charred material ignited, transitioning into open flames.
Investigators found evidence that smoke had been developing within the mulch pile before visible flames appeared. Once ignition occurred, powerful winds drove the fire horizontally, carrying embers into nearby mulch piles, engineered wood products known as BCI joists, and other combustible materials. Embers were also blown across Tolo Road into adjacent grass fields, contributing to the fire’s rapid expansion.
Fire officials also addressed several misconceptions that circulated after the incident. Investigators said wooden pallets were not involved in the fire, noting that stored BCI joists may have appeared similar to pallets in photographs. They also stated that a green metal container located near the point of origin was neither involved in the fire nor the source of ignition.
The fire ultimately burned approximately 50 acres, including the industrial yard and adjacent grasslands.
District officials said the incident demonstrated how quickly wind-driven fires can escalate and highlighted the importance of defensible space and fuel reduction efforts in slowing fire spread.
Fire District 3 credited numerous private-sector partners for assisting during the emergency. Seven privately owned water tenders responded to support suppression efforts, while a grader from Central Rock and Redi-Mix helped establish a containment line along the southern edge of the fire.
Officials also praised the Hilton family and employees for remaining on-site throughout suppression operations. While firefighting crews continued applying water and monitoring hotspots, Hilton personnel operated heavy equipment to assist with extinguishment efforts.
District leaders said both Fire District 3 and Hilton Landscape Supply plan to use lessons learned from the incident to strengthen fire prevention and safety measures moving forward.
No injuries were reported.
The investigation has been completed, and officials said no criminal activity was involved in the cause of the fire.
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