Avalanche Lake

Avalanche Lake is the most-hiked alpine lake trail in Glacier — 5.9 miles round-trip via the Trail of the Cedars boardwalk and a moderate 757-foot climb through old-growth Western red cedar before the lake basin opens beneath the 2,000-foot cliffs of Mt Brown. The trailhead sits at Avalanche Creek on Going-to-the-Sun Road, which means it's subject to the 21-foot vehicle length restriction AND requires a Going-to-the-Sun Road timed-entry reservation between May and September. Avalanche Campground (26-ft rig cap, dry only) is at the trailhead itself — its short length cap explicitly excludes most motorhomes; Class B vans and trailers under 27 ft are the realistic fit. Rigs over 26 ft stage at Apgar Campground (40-ft cap, dry) and board the free park shuttle that runs Apgar to Logan Pass via Avalanche. Snow lingers on the trail's final approach into mid-July most years and the lake itself often holds ice through early June.