| White Cap Peak | |
| Elevation Ft: | 11899 |
| Elevation Ref: | [1] |
| Prominence Ft: | 619 |
| Prominence Ref: | [2] |
| Isolation Mi: | 1.07 |
| Isolation Ref: | [3] |
| Parent Peak: | Leatherman Peak (12,228 ft) |
| Map: | Idaho#USA |
| Label Position: | bottom |
| Map Size: | 240 |
| Location: | Salmon–Challis National Forest |
| Country: | United States of America |
| State: | Idaho |
| Region: | Custer |
| Region Type: | County |
| Coordinates: | 44.0845°N -113.7545°W |
| Range: | Lost River Range Rocky Mountains |
| Rock: | Limestone[4] |
| Age: | Mississippian |
| Type: | Fault block |
| Topo: | USGS Elkhorn Creek |
| Easiest Route: | hiking |
White Cap Peak is an 11899adj=midNaNadj=mid mountain summit located in Custer County, Idaho, United States.
White Cap Peak ranks as the 18th-highest peak in Idaho and is part of the Lost River Range which is a subset of the Rocky Mountains.[3] The mountain is set on land managed by Salmon–Challis National Forest. Neighbors include Leatherman Peak, 1.1 mile to the east, Mount Morrison 2.6 miles to the northwest, Little Regret Peak 3.55 miles east, and Borah Peak, the highest peak in Idaho, is 3.9 miles to the north-northwest.[2] Leatherman Pass, elevation 10,512 ft, is the low point of the saddle midway between White Cap Peak and Leatherman Peak.[5] Precipitation runoff from the mountain's slopes drains southwest to Big Lost River and northeast into headwaters of West Fork Pahsimeroi River. Topographic relief is significant as the summit rises 5600abbr=offNaNabbr=off in four miles above Highway 93 in Big Lost River Valley, and 1800abbr=offNaNabbr=off above Pass Lake in less than one-half mile.
Based on the Köppen climate classification, White Cap Peak is located in an alpine subarctic climate zone with long, cold, snowy winters, and cool to warm summers.[6] Winter temperatures can drop below −10 °F with wind chill factors below −30 °F.