One of the most rapidly expanding wildfires in the country is burning along the Oregon-Idaho border, where the Big Grass Fire has scorched approximately 280,000 acres since igniting July 23, 2026, near Jordan Valley in Owyhee County. As of July 26, the fire was just 5% contained, and firefighters continued working to slow its spread across the sagebrush-dominated rangeland of the high desert.

Fast-Moving Fire in Remote Terrain

The Big Grass Fire ignited in the vast rangelands along the Oregon-Idaho border — terrain characterized by dense sagebrush, native grasses, and sparse development. The combination of low humidity, strong winds, and dry fuels enabled the fire to grow explosively in its early days. Fires in grass and sagebrush ecosystems can move faster than firefighters can construct line, especially under critical weather conditions.

Emergency alerts continued to be issued to area residents. Access to the North Fork Campground was also temporarily closed as the fire expanded into adjacent land.

Regional and National Context

The Big Grass Fire is among three large fires burning in Idaho currently tracked by the National Interagency Fire Center. At the national scale, the fire is one of 90 large incidents burning across the country as of July 26, taxing resources at every level of the fire management system.

Idaho's high desert receives little precipitation in summer and experiences periods of extended drought, making large sagebrush fires a recurring and often devastating feature of the fire season. Fires of this type can also have significant consequences for wildlife habitat, livestock grazing, and rural economies dependent on rangelands.

What to Watch

Residents in Owyhee County, Oregon and the Jordan Valley area should monitor emergency alert systems and have evacuation plans ready. Those in the region can sign up for emergency alerts through their county sheriff's offices or state emergency management systems.

Fire managers are working with available resources, but the scale of regional and national fire activity means that air tanker and crew availability may be limited. Residents should not wait for a Level 3 evacuation order if they feel threatened — early voluntary evacuation is always safer.

Quick Facts

  • Location: Oregon-Idaho border, Owyhee County, near Jordan Valley
  • Size: Approximately 280,000 acres (as of July 26)
  • Containment: 5%
  • Start date: July 23, 2026
  • Cause: Under investigation