The Big Grass Fire has officially become the largest wildfire in Oregon’s modern recorded history, having consumed more than 582,226 acres across the high desert of Malheur County in southeastern Oregon and spilling across the state line into western Idaho. As of the most recent InciWeb update on August 15, the fire remains only approximately 34–36% contained despite a massive suppression effort.

Origin and Explosive Growth

The Big Grass Fire ignited on July 23, 2026, sparked by a dry lightning storm that swept across the Great Basin. Its initial growth was staggering: the fire burned more than 282,000 acres in its first two days alone, racing across cured grass and sagebrush in near-zero humidity with erratic, gusty winds. Roughly 25 miles southwest of Jordan Valley, Oregon, the remote terrain made early ground-level access nearly impossible.

The fire’s scale quickly overwhelmed local resources. A Type 1 Incident Management Team was assigned, and reinforcements from across the western United States were ordered in. Despite the resource surge, continued hot and dry conditions allowed the fire to grow steadily in the weeks that followed.

Threatening Communities and Livestock

The fire’s remote location in one of Oregon’s most sparsely populated counties has limited the number of residents directly threatened by structures, but the agricultural impact has been severe. Thousands of acres of rangeland have been consumed, with ranchers losing fencing, water infrastructure, and grazing land that may take years to recover. The BLM-managed lands affected provide critical grazing allotments for cattle and sheep operations across the region.

Evacuation orders and warnings have been issued and adjusted multiple times for rural communities in the fire’s path. Residents in affected areas are urged to monitor the Malheur County Sheriff’s Office and InciWeb for the latest evacuation status.

Firefighting Operations

Crews have been working to establish and hold containment lines using a combination of hand lines, dozer lines, and aerial retardant drops. Air tankers — including Very Large Air Tankers (VLATs) — have made repeated drops along the fire’s most active perimeter. Military C-130s equipped with Modular Airborne Firefighting Systems (MAFFS), staged at Klamath Falls, Oregon, have also supported operations.

Fire managers have focused suppression efforts on protecting key infrastructure corridors, including Highway 95 and private ranch properties, while allowing portions of the fire to burn through remote wilderness areas under close monitoring.

Historic Context

Until this season, Oregon’s largest modern wildfire record was held by several massive Eastern Oregon blazes from previous years. The Big Grass Fire has now surpassed them all, serving as a stark reminder of the increasingly extreme fire conditions driven by decades of drought, land management changes, and invasive annual grasses that create a continuous fuel bed across the high desert landscape.

For current evacuation information, call the Malheur County Sheriff’s Office at their non-emergency line or visit inciweb.wildfire.gov and search “Big Grass Fire.”