About This Route
Blackfoot Glacier provides expert-level access to Blackfoot Mountain (9,000+ ft) and Jackson Glacier Col in Glacier National Park's remote Lewis Range. Approach from St. Mary Lake via Piegan Pass trail, a 10-mile hike-in with 3,000 feet gain, then 3 miles of glacier travel riddled with moulins and icefalls. This route suits experienced parties aiming for multi-day pushes; expect 2-3 days total. Use CalTopo for route planning, as the glacier's rapid melt (over 30% since 1966 per USGS) creates unstable seracs. Secure backcountry permits at St. Mary Visitor Center and adhere to NPS climbing regulations.
Safety Considerations
Key to Blackfoot Glacier mountaineering safety is early starts to dodge serac collapses and afternoon rockfall from Citadel Mountain. Crevasses up to 100 feet deep hide under snow bridges; rope up with 30m spacing and probe constantly. Avalanche terrain rates 3-4 on the scale; carry BCA gear and check MTAV forecasts. Extreme weather shifts from Continental Divide can drop visibility to zero; pack altimeter watches. Wildlife hazards include moose in Piegan Basin; make noise on trails. Train in glacier travel per American Alpine Club standards, emphasizing prusik self-rescue.
Essential Gear
Essential kit: Black Diamond Contact crampons, Petzl Summit ice axe, Sterling 8.5mm rope (60m), Gregory Baltoro pack for overnight, MSR Guardian Purifier for glacial meltwater. Helmets mandatory (Black Diamond Half Dome), plus OR Alpine Ascender prusiks, PLB (ACR ResQLink), and First Aid with blister kits.