Ryan Peak is an 11,714-foot mountain in central Idaho and the highest summit in the Boulder Mountains. In Custer County near the Blaine County line, it stands along the edge of the Sawtooth National Recreation Area and Salmon-Challis National Forest, with part of it within the Hemingway–Boulders Wilderness. It is a major regional high point, ranking second in the Sawtooth National Recreation Area after Castle Peak and 16th in Idaho. Kent Peak rises nearby in the same range. A common route begins north of Ketchum, follows forest road 146 to a trailhead, then uses Trail 115 and a final off-trail stretch to reach the summit.