Glassford Peak, Mountain summit in Sawtooth National Forest, Idaho, US

Glassford Peak is a mountain summit in the Boulder Mountains of Custer County, Idaho, within the Hemingway–Boulders Wilderness of Sawtooth National Recreation Area. It reaches 11,602 feet (3,536 m), making it the third-highest peak in the Boulder Mountains and the 39th-highest in Idaho. The summit lies about 0.55 miles (890 m) north of the Blaine County border and 5.8 km east of Ryan Peak, the range's highest point.

Glassford Peak lies in Custer County, about 0.55 miles (890 m) south of the Blaine County line, within the Hemingway–Boulders Wilderness of the Sawtooth National Recreation Area. The surrounding mountains are part of Sawtooth National Forest. The peak rises 5.8 km east of Ryan Peak, the highest summit of the Boulder Mountains.

Glassford Peak lies within the Hemingway–Boulders Wilderness of the Sawtooth National Recreation Area, designated by the U.S. Congress in 2015. The name honours Ernest Hemingway, who lived and wrote in nearby Ketchum, and the boulder fields of the range. The peak is the third highest in the Boulder Mountains and the 39th highest in Idaho.

The easiest approach starts south of Idaho State Highway 75 between Stanley and Challis; a second option leaves the highway north of Ketchum. The summit lies about 0.55 miles (890 m) north of the Blaine County border, inside the Hemingway–Boulders Wilderness. Plan for high-altitude conditions at 11,602 feet (3,536 m).

Glassford Peak is the third-highest summit in the Boulder Mountains at 11,602 feet, but the Czech Wikipedia lists it as second-highest and ninth in Idaho by prominence above 500 metres. It lies about 0.55 miles (890 m) north of the Blaine County line, in the Hemingway–Boulders Wilderness of Sawtooth National Recreation Area, Custer County.