About This Route
The Avalanche Lake trail, accessed via the Trail of the Cedars in Glacier National Park, offers one of the most stunning spots for swimming in the park. This 5.9-mile round-trip hike starts at the Avalanche Creek parking area along Going-to-the-Sun Road. Expect a gentle 730-foot elevation gain through old-growth cedar forests and alongside Avalanche Creek's roaring waters. Upon reaching the lake, you'll find crystal-clear turquoise waters backed by dramatic waterfalls cascading from Bearhat Mountain. While tempting for a dip after the hike, NPS reports water temperatures rarely exceed 50°F (10°C), making it a prime location for cold-water swimming hazards. Popular among hikers seeking refreshment, this spot sees heavy summer traffic, yet claims from swift streams and slips underscore the need for vigilance. Follow Leave No Trace principles by packing out all trash and avoiding shoreline trampling.
Safety Considerations
Glacier National Park's water safety page warns that water causes the most fatalities here; prioritize cold-water shock and hypothermia. Sudden immersion below 70°F triggers the mammalian diving reflex, restricting blood flow and risking cardiac arrest, per NPS protocols. Slippery, moss-covered rocks along the shore and near feeder streams pose slip-and-fall risks, especially post-rain. Swift glacial inflows create unpredictable currents; never swim alone or beyond waist depth. Monitor weather via NPS apps, as afternoon thunderstorms can drop temperatures 20°F rapidly. Children and exhausted hikers are at highest risk; supervise closely. REI experts recommend acclimating gradually to avoid gasping reflex. Check trail conditions at Logan Pass Visitor Center; bear activity is common, so carry spray.
Essential Gear
Pack a full wetsuit like the REI Co-op Flash Neoprene 3/2mm for insulation; a USCG-approved life jacket such as the Stohlquist Edge; quick-dry water shoes (Keen Newport H2); waterproof dry bag (Sea to Summit); whistle and signaling mirror; synthetic layers and wool hat for post-swim warmth; sunscreen (Neutrogena SPF 50+); and a first-aid kit with thermal blanket.
Emergency Tips
If hypothermic, strip wet clothes, wrap in dry layers, share body heat, and hike to trailhead for evacuation. Drowning: perform rescue breaths if trained, signal rangers via 406-888-7800 or satellite device. Nearest help at Avalanche Ranger Station.