Ptarmigan Tunnel

This is one of Glacier's most dramatic payoffs for your effort. You'll start at Iceberg Ptarmigan Trailhead and wind through dense subalpine forest before the trail opens into sweeping meadows dotted with wildflowers in late July and August. The final push involves a series of steep, rocky switchbacks carved into a headwall — the kind where you stop pretending you're not winded and just own it. Then you reach the tunnel itself: a stone passage blasted straight through the Ptarmigan Wall in the 1930s by the Civilian Conservation Corps. Walk through and you're staring down into the Elizabeth Lake valley on the other side, a view so abrupt it feels like someone swapped the backdrop. The round trip covers just over ten miles with enough vertical to remind your knees you have them. This trail rewards hikers who want something beyond a lake destination — something with genuine surprise at the end.