Saint Mary Lake: 10-Mile Glacial Fjord in Glacier NP

Saint Mary Lake reflects surrounding peaks in Glacier National Park, with a small boat cruising the calm blue water.

Saint Mary Lake in eastern Glacier National Park is a 10-mile-long glacial fjord reaching 400 feet in depth. Formed by Pleistocene glaciers carving a U-shaped valley, it sits at about 4,480 feet elevation. The lake is best viewed from Going-to-the-Sun Road pullouts, with St. Mary Falls Trail (0.6 miles to the falls) and the Highline Trail from Logan Pass nearby. Parking tends to fill early in peak season. Popular viewpoints include Saint Mary Lake Overlook and Wild Goose Island Overlook. Plan...

10-mile lake offering picturesque surrounds, wildflowers, boat tours & wildlife such as elk & bears.

Access & viewing

GPS Coordinates: 48°40′58″N 113°32′44″W
Accessibility: Paved Going-to-the-Sun Road; many accessible viewpoints; some trails are easy

Planning advice

Nearby Attractions: St. Mary Falls, Virginia Falls, Sun Point overlook, Rising Sun Boat Dock
Nearby Facilities: St. Mary Visitor Center; pullouts; restrooms; water spigots
Best Time To Visit: Late June–mid-October when Going-to-the-Sun Road is open; July–August offer warm weather and full access. Sunset alpenglow lights the peaks.
Tips Advice: Parking can fill early; use St. Mary Visitor Center lot or pullouts along the road.
Stand at Sun Point for panoramic views.
Bear spray recommended; keep distance from wildlife.
Dress in layers; water stays cold year-round.
Insider Tips: Arrive early; parking can fill quickly in peak season.
Stand at Sun Point for panoramic views.
Carry bear spray and stay away from wildlife.
Dress in layers; the water is cold year-round.

More details

Park Area: Glacier National Park
Family Friendly Notes: Keep a safe distance from wildlife; supervise children near water; bear spray recommended; stay on designated paths
Attraction Type: Cirque Lake
Elevation Feet: 4484
Distance From Entrance: Varies
Accessibility Level: Drive-up view; paved viewpoints; some trails accessible
How To Get There: Follow Going-to-the-Sun Road from the St. Mary area; pull into multiple scenic pullouts along the lake’s north shore; park at pullouts or St. Mary Visitor Center lot; use Sun Point and nearby trailheads for viewpoints
Parking Availability: Parking at pullouts along Going-to-the-Sun Road; St. Mary Visitor Center lot; can fill quickly in peak season
Road Type: Paved
Seasonal Access: Late June–mid-October; Going-to-the-Sun Road typically open in summer
Entry Fees: Included with park entrance fee
Main Features: Cirque Lake; turquoise water from rock flour; dramatic glacial walls; Wild Goose Island
What Youll See: Turquoise water, steep glacial walls, Wild Goose Island, boat tours on the lake, and multiple pullouts along the Going-to-the-Sun Road
Unique Characteristics: Turquoise hue from rock flour; exemplary glacial cirque lake with a nearby islet; part of a landscape shaped by Pleistocene glaciation and Lewis Overthrust context
Safety Considerations: Gravity: steep cliffs and potential rockfall. Water is rarely above 50°F (10°C). Bears are present; carry bear spray and maintain distance. Layers and rain gear recommended; cell service is spotty; stay on designated pullouts.
Best Viewpoints: Sun Point overlook; numerous pullouts along Going-to-the-Sun Road; St. Mary Visitor Center area
Photo Opportunities: Sunset alpenglow on peaks; early-morning light on eastern slopes; water close-ups showing rock flour color
Photography Spots: Sun Point overlook; pullouts along Going-to-the-Sun Road; St. Mary Visitor Center area
Sunrise Sunset Quality: Alpenglow on surrounding peaks at sunset; early morning light on eastern slopes
Visitor Center Present: 1
Restrooms Available: 1
Restroom Type: Vault toilets at some pullouts; restrooms at St. Mary Visitor Center
Interpretive Signs: 1
Cell Service: Spotty
Water Available: 1
Trailheads Here: St. Mary Falls Trail (0.8 miles one-way); Sun Point Trail; Virginia Falls; Rising Sun Boat Dock area
Connecting Trails: St. Mary Falls Trail (0.8 miles one-way); Sun Point Trail; Virginia Falls; Rising Sun area trails
Nearby Services: St. Mary Visitor Center; restrooms; potable water spigots; parking
Common Wildlife: Elk, mule deer, bighorn sheep, mountain goats, grizzly bears, black bears, moose, bald eagles, osprey
Best Wildlife Times: Early morning and late evening
Geological Formation Type: Cirque Lake
Scientific Interest: Glacially carved U-shaped valley; turquoise water from rock flour; Lewis Overthrust context; Pleistocene glaciation
Road Opening Dates: Late June–mid-October
Snow Lingering: Winter lake can freeze up to 4 feet thick
Winter Access: Winter access limited; heavy snow and road closures
Best Visit Times: Dawn and dusk for light and wildlife; avoid midday glare; peak summer is busiest
Best Season: Summer (late June through September) is the best window for Saint Mary Lake, aligning with the Going-to-the-Sun Road being generally open. The road typically closes in mid-October and reopens in late May to early June.
Weather Patterns: Rapidly changing mountain weather; glare off water at midday; warm summers with potential afternoon weather shifts
Peak Fill Times: Parking fills early in peak season
Busiest Season: Peak summer (July–August)
Lake Size: 3923 acres (15.88 km²)
Boating Allowed: 1
Review Summary: Rated 4.8 stars from 131 reviews, Saint Mary Lake earns high marks for its turquoise water and dramatic glacial backdrop. Visitors praise easy access along the Going-to-the-Sun Road and nearby trails, with wildlife sightings common near meadows and water. Crowds rise in midsummer, but the scenery remains compelling and scientifically rich, offering a clear window into Glacier’s glacial past.

Location

Photos

Saint Mary Lake at Glacier National Park surrounded by pine forests and towering peaks under a blue sky.

Saint Mary Lake with jagged Glacier peaks under a bright summer sky in Glacier National Park.

Saint Mary Lake sits beneath a bright blue sky in Glacier National Park, with forested shorelines and distant mountains.

Saint Mary Lake at Glacier National Park, a tranquil lakefront with a wooden dock against rugged peaks.

Frequently asked questions

Do I really need to arrive before 7am to get parking?

Parking can fill early in peak season; plan to arrive before the late morning rush or use the St. Mary Visitor Center lot which sometimes has more space. The lakeview pullouts along the Going-to-the-Sun Road also offer quick access points.

Is it worth the hike to St. Mary Falls from the lake area?

Yes. The 0.8 mile one-way trail is short and rewarding, bringing you to a productive waterfall with views back toward the lake and cirque walls.

Will my 65-year-old mother be able to walk to the viewpoint?

Yes, because the Going-to-the-Sun Road provides paved viewpoints, and several overlooks near the lake are accessible with relatively short, easy walks.

Is the water actually blue, or is that just in photos?

The water is turquoise in real life, caused by rock flour suspended in the lake from glacial grinding.

Is bear spray recommended when visiting Saint Mary Lake?

Yes. Bears are present in the area; carry bear spray and maintain distance from wildlife, especially near meadows and water sources.

Is there a boat tour on Saint Mary Lake?

Yes, boat tours operate on the lake, offering a different perspective of the cirque and Wild Goose Island.

Can I access facilities in winter?

Winter access is limited; the Going-to-the-Sun Road is typically closed to through traffic, and facilities are minimal.