Big Hole National Battlefield preserves a battlefield in the western United States, located in Beaverhead County, Montana. In 1877, the Nez Perce fought a delaying action against the U.S. Army's 7th Infantry Regiment here on August 9 and 10, during their failed attempt to escape to Canada. This action, the Battle of the Big Hole, was the largest battle fought between the Nez Perce and U.S. Government forces in the five-month conflict known as the Nez Perce War.

Beaverhead County is the largest county by area in the U.S. state of Montana. As of the 2020 census, the population was 9,371. Its county seat is Dillon. The county was founded in 1865.