2026 Custer County Fair is located in Mackay at the fair grounds. The fair will start on Monday, July 27th and end on Saturday, August 1st. Please do come there will be fun for everyone.

Please click HERE for the 2026 Custer County Fair Page.

Historical and scenic Custer County, founded in 1881 and located in Central Idaho, has a population of 4,368 and an area of 4,938 sq. miles. Its landscape consists of arid desert, flat green valleys, and rugged rocky peaks and contains the highest mountain in Idaho, Mount Borah at 12,662 ft.

The County seat is Challis, with a population of just over 1,000. Other towns include Mackay, Stanley, and Clayton. Custer County relies on ranching, mining, and tourism as its main resources.

Custer County contains much of the Frank Church River of No Return Wilderness and the famous Salmon River as well as the Sawtooth National Recreation Area.