Ptarmigan Lake

Overview

Ptarmigan Lake is the midway prize on the Ptarmigan Tunnel route: a glassy, turquoise tarn tucked right under the sheer Ptarmigan Wall. It’s where most hikers catch their breath, snack, and refill water before tackling the steep, exposed switchbacks to the tunnel. Expect classic alpine scenery, fewer crowds than nearby headline hikes, and a real sense of being in big country.

Getting There

Start from the Iceberg–Ptarmigan Trailhead behind Swiftcurrent Motor Inn in Many Glacier. You’ll pass Ptarmigan Falls around 2.3–2.5 miles in (there’s a pit toilet just before the falls), then keep right at the junction for Ptarmigan. The lake sits roughly 4.2–4.5 miles from the trailhead, depending on the exact spur you take down to the shore.

What You’ll See

• Views open early to Mount Grinnell, Swiftcurrent Mountain, and Mount Wilbur, then tighten as you climb toward the Ptarmigan Wall.
• The lake itself is a scenic, wind-rippled basin with Crowfeet Mountain looming above—great for photos and a quiet pause.
• Beyond the lake, the route traverses red argillite scree and two stout switchbacks to the tunnel. Even if you stop at the lake, you’ll feel the drama of that headwall rising above you.

Trail Feel and Difficulty

The grade is steady rather than brutal until after the lake, but you’ll still gain notable elevation on the way in. Plan a full-day outing if you’re continuing to the tunnel; if you’re only going to the lake, it’s still a strenuous half-day due to distance and climb.

Wildlife and Safety

This corridor is prime habitat for bears (both grizzly and black), plus mountain goats and bighorn sheep on the slopes above the lake. Hike in a group, make noise in brushy sections, carry bear spray, and check for wildlife-related closures before you go.

Water, Restrooms, and Services

There are no facilities at Ptarmigan Lake. Fill bottles at Swiftcurrent Motor Inn before you start; you can filter from Ptarmigan Creek or the lake and falls if flows are reasonable. The only on-trail toilet is near Ptarmigan Falls—plan accordingly.

2025 Access Notes

During the 2025 season, road and area construction in Many Glacier restricts access beyond Many Glacier Hotel. Expect closed parking at Swiftcurrent and a temporary start near the hotel with hiker shuttles and extra walking. Verify current logistics before you go.

Best Time to Visit

• Season: Snow can linger well into summer at higher elevations; the tunnel typically opens mid-July to late September, but the lake is a rewarding turnaround even if the doors are shut.
• Daily timing: Start early to find parking and enjoy calm water and softer light. Midday can be hot and exposed around the headwall.
• Crowds: Fewer hikers than the Iceberg Lake route, but this is still a popular trail—weekdays and early starts help.

Tips for a Better Visit

• Treat Ptarmigan Lake as your last reliable shade and rest stop before the steep, exposed switchbacks.
• Bring trekking poles for the rocky traverse above the lake and any lingering early-season snow patches.
• Carry 2–3 liters of water and a filter; there’s no potable water on trail.
• Always check current trail status and any wildlife or seasonal closures before heading out.
• In 2025, budget extra time to reach the temporary trailhead and consider the hiker shuttle.