A high, rugged mountain range in central Idaho, known for elevation over 3,900 meters, technical alpine climbs, and the resort town of Sun Valley at its southern end.

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Geography

ContinentNorth America
RegionPacific Northwest
SubregionNorthern Rockies
CountryUnited States
StateIdaho
CountyCuster County
DistrictBitterroot Range
CityBogus Basin
TimezoneAmericaDenver
Latitude44.25
Longitude-114.7
Maps
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The Lost River Range is a steep, craggy spine in central Idaho that rises sharply from the plains to peaks surpassing 3,950 meters. Dominated by Geraldine Peak and Mount Blachford, the range offers challenging alpine climbs, serious off-trail navigation, and the craggy glacial basins of the Hiyu Glacier and Overland Glacier. To the south, the Sun Valley resort and valley provide access to high elevation trails and ski terrain, while the northern passes link to the broader Bitterroot and Salmon River basins. Expect variable weather, rapid elevation change, and to come prepared for remoteness if venturing off-trail or into the higher passes. The range is a prime destination for mountaineers, backcountry skiers, and experienced hikers seeking solitude and big mountain terrain.

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