Ptarmigan Tunnel Trail

Ptarmigan Tunnel Trail is a 10.6-mile out-and-back from the Iceberg-Ptarmigan Trailhead in Many Glacier. It climbs 2,300 feet, first through woods to Ptarmigan Falls, then past Ptarmigan Lake and up steep, open switchbacks to Ptarmigan Tunnel. Walk through the roughly 250-foot passage for the north-side view toward Elizabeth Lake, then return the same way. Allow about six hours; five to seven hours is a sensible window when you take breaks. This is a full day for hikers comfortable with sustained climbing, but it rewards the effort with more than a viewpoint: a waterfall, an alpine lake, a historic passage cut through the wall, and a sudden change of valley on the far side. If you want a shorter version, Ptarmigan Falls is 5.4 miles round trip and Ptarmigan Lake is 8.6 miles round trip.

The first section winds through forest and patches of open meadow. At the Ptarmigan Falls junction, keep following the Ptarmigan route toward the tunnel; Iceberg Lake is a separate hike and adds distance. Ptarmigan Falls is 2.7 miles each way from the trailhead and makes the easiest turnaround if you only want the falls. The way back follows the same line, so the climb you took on the way out becomes a long descent after the tunnel. You do not need to add the Iceberg Lake branch to reach Ptarmigan Tunnel.

Ptarmigan Lake is about 4.3 miles each way and a good place to pause before the hardest stretch. The trail then climbs steep switchbacks across the open slope toward the wall. The views widen over the basin, but the trees have fallen away and the upper section can be sunny and windy. Visitors repeatedly describe the last half-mile to mile as the toughest part. Save time and energy for it rather than treating the lake as the finish. This is bear country; carry bear spray where you can reach it, as the park recommends.

The roughly 250-foot tunnel was cut through Ptarmigan Wall beginning in 1930 to connect Many Glacier with the Belly River area without making hikers cross the steep wall. Ptarmigan Lake is the south-side landmark; just beyond the north portal, the view opens toward Elizabeth Lake beneath the surrounding peaks. That change of scenery is the defining payoff, so stop for a look before turning around. The Ptarmigan Trail continues beyond the tunnel toward longer backcountry routes, but those miles are not part of this 10.6-mile day hike.