Lost Trail Powder Mountain straddles the Montana and Idaho border at Lost Trail Pass, with 69 runs across about 1,800 acres (728 hectares). The base is 6,400 ft (1,951 m) and the summit rises to 8,200 ft (2,499 m), a vertical drop of 1,800 ft (548 m). Intermediate runs make up 40% of the terrain, with 20% each for beginner, advanced and expert. The lift network is simple, with five double chairs and three surface lifts. The high pass location brings deep, dry snow, and Sanity records annual snowfall at roughly 306 inches, which explains its powder reputation across the region.

Most of the main runs and the base area sit in Montana, while Chair 1 follows the state line and the terrain served by Chair 2 lies in Idaho. Open glades, tree runs and powder-friendly pitches make up much of the expert and advanced skiing, and the groomed runs stay mellow enough for beginners and intermediates. It suits powder skiers, families and Indy Pass holders who want a low-key, old-school day without queues. Anyone expecting high-speed chairs or a big village will find none, but those who come for the snow rarely mind the double chairs and the simple, friendly feel of the place.

The 2025-26 season at Lost Trail Powder Mountain ran from 5 December 2025 to 6 April 2026, a roughly eighteen-week season supported by average annual snowfall of around 306 inches. This substantial snowfall total underpins the resort's legendary reputation for deep, reliable powder, particularly on the Thursdays for which the mountain has become known among regional skiers.

Midwinter, from December through February, typically brings the most consistent conditions across the resort's evenly balanced terrain. Given the mountain's remote setting straddling the Montana-Idaho border at Lost Trail Pass, the resort draws primarily from the Bitterroot Valley and broader regional skier base rather than national destination traffic, keeping crowds notably lighter than more accessible resorts.

As an Indy Pass resort, Lost Trail draws some visiting skiers holding that multi-resort pass in addition to its core regional base. The resort's genuinely balanced terrain split across beginner, intermediate, advanced and expert skiing suits families and groups with mixed ability levels. School holiday periods bring increased family visitation given this broad terrain appeal.

Specific event programming beyond standard operations and the resort's Thursday powder day reputation is not confirmed in available resort information. More than fifty years of Grasser family ownership, from Bill Grasser's 1967 purchase through to the current Scott and Judy Grasser stewardship, continues to shape the resort's community-focused, family-run character each season. Lost Trail's unusual cross-border geography remains a distinctive point of interest for visitors throughout the winter.