| Boulder Peak | |
| Elevation Ft: | 10981 |
| Elevation Ref: | [1] |
| Prominence Ft: | 401 |
| Isolation Mi: | 0.74 |
| Isolation Ref: | [2] |
| Parent Peak: | Boulder Basin Peak (11,041 ft) |
| Map: | Idaho#USA |
| Label Position: | bottom |
| Map Size: | 240 |
| Part Type: | Protected area |
| Part: | Sawtooth National Recreation Area |
| Country: | United States |
| State: | Idaho |
| Region: | Blaine |
| Region Type: | County |
| Coordinates: | 43.8325°N -114.5184°W |
| Coordinates Ref: | [3] |
| Range: | Boulder Mountains Rocky Mountains |
| Topo: | USGS Easley Hot Springs |
| Easiest Route: | scrambling |
Boulder Peak is a 10981adj=midNaNadj=mid mountain summit located in Blaine County, Idaho, United States.
Boulder Peak ranks as the 127th-highest peak in Idaho and is part of the Boulder Mountains which are a subset of the Rocky Mountains.[2] The mountain is situated 15 miles northwest of Ketchum, Idaho, in the Sawtooth National Recreation Area on land managed by Sawtooth National Forest.[4] The peak is easily seen from Highway 75, and is the most visible of the Boulder Mountains.[1] Precipitation runoff from the mountain's slopes drains to the Big Wood River via Boulder Creek. Topographic relief is significant as the summit rises 4400abbr=offNaNabbr=off above Big Wood River in four miles. This landform's toponym has been officially adopted by the United States Board on Geographic Names.[3]
Based on the Köppen climate classification, Boulder Peak is located in an alpine subarctic climate zone with long, cold, snowy winters, and cool to warm summers.[5] Winter temperatures can drop below −10 °F with wind chill factors below −30 °F.