The fire on and around the Northern Cheyenne Indian Reservation near Lame Deer, Montana, is 100 percent contained, and cleanup is under way.
All five Montana wildfires have now been contained, the Billings Gazette reported. Besides Ash Creek, which burned 249,562 acres (390 square miles), were the Taylor Creek, Powerline, Horse Creek and Coal Seam fires. In all they burned 325,000 acres, the newspaper said.
More on the worst wildfire season in U.S. history to date: