Lost Trail Powder Mountain is an alpine ski area in the western United States, on the Montana-Idaho border in the northern Rocky Mountains. In the Bitterroot Range, it is at the junction of US Highway 93 and Montana State Highway 43 at Lost Trail Pass, about one mile (1.6 km) northwest of Chief Joseph Pass, which is on the Continental Divide. The ski area is located immediately west of US-93, which descends northward into Montana. The ski area is open four days per week (Thursday through Sunday) and holidays. The business office is to the north in Montana at Conner, about midway to Hamilton.