Summit Mountain, Glacier National Park: geology and hike access

Summit Mountain rises over snow-covered slopes and forested lower elevations in Glacier National Park, Montana.

Summit Mountain is an 8,775-foot peak on Glacier National Park's Continental Divide. Formed by the Lewis Overthrust with Belt Supergroup rocks pushed over younger strata, it was sculpted by Pleistocene glaciers. The main ascent follows the Autumn Creek Trail from Marias Pass for about 5 miles round-trip, starting near the saddle with Little Dog Mountain and gaining roughly 1,820 ft. The prime window is late June through mid-September; prepare for exposed sections and rapidly changing weather.

Access & viewing

GPS Coordinates: 48°21′14″N 113°22′11″W
Accessibility: Location: Summit Mountain sits at 48°21′14″N 113°22′11″W in Glacier National Park. Access requires a hike via the Autumn Creek Trail from the Marias Pass trailhead. The primary ascent to the Continental Divide from the saddle with Little Dog Mountain is about 5 miles round trip. Parking is at the Marias Pass trailhead on the north side of U.S. Highway 2, near the railroad tracks. Parking is limited in peak season and lots can fill early. From the summit, expansive views include the Great Bear Wilderness, the Flathead Range, the Bob Marshall Wilderness, the central Montana plains, and distant peaks along the Continental Divide.

Planning advice

Nearby Attractions: Continental Divide, Marias Pass, Summit Mountain Lodge, Summit Campground; Belt Supergroup geology
Nearby Facilities: Summit Campground restrooms; potable water at Summit Campground; Summit Mountain Lodge viewing area
Best Time To Visit: Late June through mid-September is best; shoulder seasons May–mid June and mid-September to mid-October offer fewer crowds.
Tips Advice: Parking fills by early morning in summer; arrive early or use overflow.
Bear spray is highly recommended; make noise on trails to avoid surprise wildlife.
Dress in layers; ridges cool quickly; traction cleats help in winter.
Cell service is very limited; download maps and leave a plan with others.
Insider Tips: Parking fills early in summer; plan to arrive early
Carry bear spray and make noise while hiking
Wear layers and bring traction devices in winter

More details

Park Area: Glacier National Park
Family Friendly Notes: Exposed edges demand caution; hold hands with children near drop-offs.
Attraction Type: Geological Formation
Elevation Feet: 8775
Distance From Entrance: Varies
Accessibility Level: Drive-up view; some trails accessible.
How To Get There: Drive to Summit Campground area and use the Summit Mountain Lodge overlook; parking is limited, with possible overflow parking during peak season.
Parking Availability: Parking is limited and often fills by early morning during the summer. Overflow parking may be available.
Seasonal Access: Roads/trails open late June through mid-September; shoulder seasons May–mid-June and mid-September–mid-October have fewer crowds; winter access is limited or closed.
Entry Fees: Included with park entrance fee
Main Features: Lewis Range; Continental Divide; Lewis Overthrust Fault with Belt Supergroup rock exposure
What Youll See: Rugged ridges and high-country terrain, exposed Belt Supergroup rocks, and a Continental Divide viewpoint from Summit Mountain Lodge overlook.
Unique Characteristics: Oldest-to-younger rock juxtaposition along the Lewis Overthrust; Belt Supergroup rocks ~1.4–1.6 billion years old exposed near the Continental Divide.
Safety Considerations: Gravity governs the cliffs—stay on marked trails. Hypothermia risk rises with altitude; dress in layers and carry rain gear. Snow and ice can hide crevasses; approach with caution, especially on winter trails. Bears inhabit the area; carry bear spray and know how to use it.
Best Viewpoints: Summit Mountain Lodge overlook; ridge vantage along the Continental Divide.
Photo Opportunities: Sunset over the Divide from the lodge overlook; long-range panoramas of the mountain face and exposed rock strata.
Photography Spots: Summit Mountain Lodge overlook; ridgeline exposures along the Continental Divide.
Sunrise Sunset Quality: Sunset light often enhances the mountain scenery.
Restrooms Available: 1
Restroom Type: Handicapped accessible restrooms at Summit Campground
Cell Service: Very limited; most areas have no reception
Water Available: 1
Trailheads Here: Continental Divide National Scenic Trail traverses the upper slopes.
Connecting Trails: Continental Divide National Scenic Trail
Nearby Services: Summit Campground facilities; Summit Mountain Lodge
Common Wildlife: Grizzly bears, black bears, mountain goats, bighorn sheep, deer, elk
Best Wildlife Times: Dawn and dusk
Geological Formation Type: Lewis Overthrust fault; tectonic uplift; Belt Supergroup rock exposure
Scientific Interest: Visible evidence of continental-scale thrust; Belt Supergroup rocks 1.4–1.6 billion years old; proximity to Marias Pass; Bailey Willis's 1901 recognition of the Lewis Overthrust
Road Opening Dates: Roads typically open in late June; winter closures common.
Snow Lingering: Snow linger varies; winter conditions limit access.
Winter Access: Winter access limited due to snow; expect closures.
Best Visit Times: Evenings and sunsets; late June through mid-September.
Best Season: Late June through mid-September
Weather Patterns: Rapidly changing mountain weather; cold temperatures; snow and ice persistence; potential afternoon thunderstorms in summer.
Peak Fill Times: Parking fills by early morning during peak season.
Busiest Season: Summer
Review Summary: One 5-star review notes the commanding ridge views and the convenience of drive-up access paired with nearby trails and lodge vistas.

Location

Photos

Summit Mountain rising behind a pine forest with cloudy skies over Glacier National Park

Summit Mountain rises above snow-covered Glacier National Park, with forested slopes and a pale winter sky.

Summit Mountain rises above evergreen forest in Glacier National Park on a misty, rainy day overlooking a roadside meadow.

Frequently asked questions

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

Parking is limited and often fills by early morning during the summer; overflow parking may be available.

Is it worth the effort to reach Summit Mountain for the views?

Yes. A drive-up vantage exists at Summit Mountain Lodge, with hiking trails on the upper slopes and a superb Continental Divide perspective.

Is cell service reliable there?

No. Cell service is very limited; plan ahead and download maps.

Can I hike with my dog to the summit area?

Specific leash or pet policies for Summit Mountain aren’t provided here; Summit Campground and lodge areas have clearer facilities—plan accordingly and follow park rules.

Is Summit Mountain accessible for visitors with mobility concerns?

Direct accessibility details for Summit Mountain aren’t specified; Summit Campground provides handicapped facilities, so plan around the campground access and use the lodge overlook for viewing.

Will I see wildlife on the trails?

Wildlife such as grizzly and black bears, mountain goats, and elk inhabit Glacier; carry bear spray, make noise, and maintain distance.

Is there a recommended season to visit for fewer crowds?

Yes—shoulder seasons (May–mid June and mid-September–mid-October) offer fewer crowds; peak summer sees more visitors on the trails and views.