Custer, Ghost town in Custer County, Idaho.

Custer is a ghost town in Custer County, Idaho, at 6,470 feet (1,972 m) along Yankee Fork Road southwest of Challis, within Challis National Forest. Its 29-acre historic district, listed on the National Register in 1981, retains only seven buildings with enough historic integrity to count as contributing properties.

Custer was established in 1877, not 1879, as a gold mining settlement along Yankee Fork Road southwest of Challis. In 1981 the community was listed on the National Register of Historic Places as a historic district covering 29 acres, though only seven buildings retain enough historic integrity to qualify as contributing properties. Most of the town is now part of the Land of the Yankee Fork State Park.

Custer was established in 1877 and named for the nearby General Custer mine. The townsite grew along Yankee Fork Road, and today most of it lies within the Land of the Yankee Fork State Park, which also holds the Yankee Fork gold dredge. Seven buildings retain enough historic integrity to count as contributing properties in the 29-acre district listed in 1981.

Visitors reach the town via a nine-mile gravel road from Highway 75 at Sunbeam. Guided tours are available during the summer months, and the site offers basic visitor access to the historic buildings.

The Challis National Forest manages this National Register site, and a volunteer group called Friends of Custer Museum maintains public access to the buildings. This partnership between the forest service and volunteers keeps the site open for visitors.