Red Eagle Lake

Overview

This is a long, scenic out-and-back to a quiet east-side lake with big views over the St. Mary Valley. The most direct version is about 17.7 miles total with roughly 1,453 feet of gain, typically taking around 6.5–7 hours for fit day hikers. Expect sections of narrow, overgrown tread—this is a trail for folks who don’t mind brush and want solitude beyond the waterfall crowds. Backcountry camps at the Foot and Head of Red Eagle Lake make it a natural backpack for an easier-paced overnight.

Trail experience

From the 1913 Ranger Station area, the route rolls through meadows and past burn areas that green up with wildflowers in early summer. You’ll follow Red Eagle Creek toward the lake, crossing multiple bridges—including memorable suspension spans—with sweeping valley views. Mid-August often brings thick thimbleberries and colorful blooms, but also tall, wet vegetation; long pants help, and you’ll get soaked on rainy days. Reviewers consistently note chest-high brush in places. Expect a mix of forest, meadows, streams, and a peaceful lakeshore payoff with designated camps at both the Foot and Head.

Geology to notice

Glacier’s mountains, including those you see along this trail, are built from ancient sediments laid in the Belt Sea over a billion years ago. Keep an eye out for layered red and purple rocks colored by iron oxidation, and contrasting greens/blues formed in low-oxygen settings that later altered to chlorite. The park also preserves stromatolites—layered fossil buildups from ancient cyanobacteria—especially prominent in east-side formations. They’re a reminder you’re walking through one of North America’s most remarkable sedimentary rock records.

Wildlife, safety, and permits

Bear sign is common here; grizzlies frequent the area. Make noise in brushy stretches and carry bear spray. Cell service is limited to none—download offline maps. Seasonal conditions swing widely: early summer can be muddy with lingering snow at higher spots, and autumn can bring sudden snow with bears foraging heavily. For overnights, there are designated wilderness campgrounds at the Foot (REF) and Head (REH) of Red Eagle Lake; you’ll need a valid backcountry permit listing the specific camp and date. Use the provided bear poles/boxes for all food and scented items; bring a sturdy hang bag and line. Pick up permits in person by late afternoon on your start or the day prior. A valid wilderness permit also covers vehicle access needs during your trip.

Route options

• Most direct: about 17.7 miles round trip, ~1,453 feet gain, brushy in places.
• Variant from the 1913 Ranger Station is reported around 16.2 miles round trip with ~1,100 feet gain.
• Longer variant via the St. Mary Lake Trail (past St. Mary and Virginia Falls) runs about 20.5 miles round trip with ~2,322 feet of gain—gorgeous but often very overgrown beyond the falls and much quieter. In winter, locals ski the mellow first miles of the main approach.

Best time to hike

Mid-July through early September offers the best trail conditions and longest daylight, with mid-August wildflowers and thimbleberries a highlight. Start early to beat heat, afternoon storms, and to enjoy the quiet lakeshore. Early season can be muddy with lingering snow patches; late season brings colder mornings and very active bears. Pets are not allowed on park trails.