The pass is about a half mile (1 km) west of the Continental Divide, which retreats eastward at this point, inside Montana along the Ravalli–Beaverhead County border, toward Butte.

Southeast of Lost Trail Pass, the divide straddles the state line into Yellowstone National Park and continues in Wyoming.

In Montana, US 93 drops northward into the Bitterroot River Valley and gradually descends toward Hamilton, Lolo, and Missoula.

[3] The Lost Trail Powder Mountain ski area is at the pass, immediately west of US 93, with lifts and runs in both states.

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