Thompson Peak, Mountain summit in Sawtooth Range, Idaho

Thompson Peak is the highest summit of the Sawtooth Range in Idaho, reaching 10,751 feet (3,277 m). Its top lies in Custer County, while lower slopes extend into Boise County. The peak sits within the Sawtooth Wilderness of Sawtooth National Recreation Area, about 6 miles (9.7 km) northeast of Stanley. Neighboring Williams Peak is directly north, and Mickey's Spire is 0.24 miles (0.39 km) to the south-southwest.

The sources record no naming date, board decision or namesake for Thompson Peak, so its origin is undocumented. What is documented is its setting: the 10,751 ft summit lies in Custer County, with lower slopes in Boise County, inside the Sawtooth Wilderness of the Sawtooth National Recreation Area, about 6 miles northeast of Stanley.

The peak's name is not tied to a documented local tradition in the sources; what visitors encounter is a summit inside the Sawtooth Wilderness, reached by four named routes: South Couloir (class 3), Southwest Couloir (5.2), Northeast Face (5.8) and West Crack (5.2). The easiest approach runs from the Redfish Lake trailhead via the Fishhook Creek and Alpine Way trails.

The hike begins at the Redfish Lake trailhead on well-marked paths that lead to multiple ascent options. Proper hiking boots and mountain experience are essential, especially where the route includes steeper climbing sections.

Mickey's Spire stands 0.24 miles (0.39 km) south-southwest of the summit, and the neighbouring Williams Peak rises directly to the north. The easiest approach leaves the Redfish Lake trailhead, follows the Fishhook Creek Trail to the Alpine Way Trail, then continues off trail past an unnamed lake to the saddle between Thompson and Williams Peaks.