Boulder Pass and Ptarmigan Lake

This is the Fish Creek Trailhead approach to Boulder Pass and Ptarmigan Lake in Banff’s Skoki backcountry. The route starts on the wide Temple access road, then narrows into forest and subalpine meadows before climbing past Halfway Hut to Boulder Pass and the blue waters of Ptarmigan Lake.

The stored line follows the complete physical corridor once from Fish Creek Trailhead to the lake; visitors return by the same route. It is about 5.6 miles (9.0 km) one way and 11.1 miles (17.9 km) round trip, with roughly 2,000 feet (613 m) of mapped elevation gain. Most hikers should plan about 5.5 hours round trip, allowing time for breaks and alpine conditions.

The first roughly 4 km is a broad access-road walk with little shade. Above it, the route becomes a more rugged mountain trail through meadows and talus, with Boulder Pass views toward Ptarmigan Lake, Fossil Mountain, and the surrounding Skoki peaks. The lake is the turnaround for this experience; continuing toward Deception Pass or Baker Lake is a different, longer route.

This is bear country and the upper route is exposed to wind, storms, lingering snow, and limited help. Carry bear spray where it is immediately accessible, treat water, bring layers and navigation tools, and be prepared for rocky or muddy footing. Backcountry camping requires the applicable Parks Canada permit and reservation.

Start at the Fish Creek Trailhead parking area off Whitehorn Road near the Lake Louise Ski Area. Public vehicles do not continue up the Temple access road; check Parks Canada access information before leaving and follow all posted restrictions.