Find Nearby Peaks

Climbing and access information for this peak is on Page 307 of the book. Updated July 2020

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Foss Mountain, named by miners, is located west of the main Lemhi Range Crest. A mining road leads from the Little Lost River Valley nearly to the summit. It was in terrible shape for driving in 1981 and has likely deteriorated with the passing of time. The road provides trail-like access at a minimum for a high start if you are interested in reaching the main Lemhi Range Crest between Bell Mountain and Diamond Peak. USGS Bell Mountain

Access

I drove nearly to the summit of Foss Mountain in 1980 and 1981 with a rugged Jeep CJ7. The Forest Service has since closed the road to 4WDs,stating: “The Foss Mountain Trail is 2.4 miles long. It begins at Junction Of 40402 and ends at At End Of Route At 2.3843 Miles.. The trail is open for the following uses: Horseback Riding, Off Highway Vehicles (OHV) less than or equal to 50 inches wide.”

Routes

Class 1 via the road (see Page 307).

Class 2 from Peak 10681.

Larry Prescott climbed the peak on an epic 13-mile, 7,300-foot gain, 6-peak day, which saw him traverse the connecting ridge from Peak 10681. See Larry’s trip report: Lemhi Enchainment, Little Sister to Foss Mountain.