The massive 553,000-acre Big Grass fire is set to become the largest wildfire in Oregon history Monday, sitting less than 4,000 acres shy of the 2012 Long Draw fire and remaining just 41% contained.

Big Grass fire nears Oregon record as wildfires force evacuations, highway closures – oregonlive.com

Over half that acreage is in Idaho, not Oregon. Details matter. Does Idaho also include the total acreage as being in Idaho?

From their own illustration as of August 20, 2026 – the dashed vertical line in the middle of this map is the Oregon-Idaho border. Most of the fire is in Idaho.