The Boulder Mountains are part of the Rocky Mountains in the western United States. Located in central Idaho, they stretch from a few miles north of Ketchum to north to near Challis, and part of the range is within the Sawtooth National Recreation Area (SNRA) and partially within the Hemingway–Boulders Wilderness. The highest point in the range is Ryan Peak, at 11,714 feet (3,570 m) above sea level.