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United States
Colorado
Boulder County

Isabelle Glacier Trail

Hard

2.7

(21)

56

runners

Isabelle Glacier Trail

02:10

13.8km

420m

Running

The Isabelle Glacier Trail is a difficult 8.6-mile jogging route in the Indian Peaks Wilderness, featuring lakes and glacier views.

Last updated: February 26, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Indian Peaks Wilderness

Roosevelt National Forest

Waypoints

A

Start point

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1

4.44 km

Lake Isabelle

Highlight • Lake

The peaks visible from the lake are Navajo Peak (the cone-shaped one), Apache and Shoshone which is the most prominent on the right of the image.

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2

7.23 km

Isabelle Glacier

Highlight • Natural

Isabelle Glacier sits at 12,000 feet above sea level. The Isabelle Glacier Trail ends finally beside Isabelle Glacier in a very steep-walled cirque basin framed by Shoshone, Apache, and Navajo …

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B

13.8 km

End point

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Way Types & Surfaces

Way Types

9.47 km

4.38 km

Surfaces

9.47 km

4.35 km

< 100 m

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Elevation

Elevation
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Weather

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Sunday 18 October

12°C

-2°C

-- %

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This route was planned by komoot.

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Frequently Asked Questions

Is the Isabelle Glacier Trail suitable for jogging?

While the initial, flatter sections around Long Lake might be suitable for trail jogging, the entire route to Isabelle Glacier is generally not recommended for continuous jogging. The high altitude, combined with increasingly steep, rocky, and uneven terrain, talus fields, and potential creek crossings beyond Lake Isabelle, makes it challenging and potentially hazardous for running.

What is the terrain like on the trail?

The trail begins with a shaded path through the forest, with a relatively flat section along Long Lake. As you ascend towards Lake Isabelle, it becomes steeper. Beyond Lake Isabelle, the terrain gets substantially more difficult, transitioning to exceptionally rocky sections, including a talus field, and a very steep final push to the glacier with switchbacks, mud, and multiple fast-flowing creek crossings. Sturdy footwear is essential.

What natural features and viewpoints can I expect to see along the way?

You'll be treated to stunning views of pristine glacial lakes, including Lake Isabelle, and an unnamed lake closer to the glacier. The route features waterfalls, abundant wildflowers, and panoramic vistas of the snow-dusted Indian Peaks. The destination, Isabelle Glacier, offers views of peaks like Navajo, Apache, and Shoshoni.

What kind of wildlife might I encounter?

The area is known for wildlife sightings, with moose commonly spotted in the Brainard Lake Recreation Area, especially around the lakes. Keep an eye out for other alpine wildlife as well.

Is this trail suitable for beginners?

The initial segments up to Lake Isabelle are considered moderately undemanding and approachable for families. However, the trail starts at a high elevation (10,300 feet), which can make breathing strenuous. The difficulty escalates considerably from Lake Isabelle to the glacier, involving rapid and significant elevation gain, making the full route challenging for beginners.

Does this route connect with other trails in the Indian Peaks Wilderness?

Yes, the route also passes through sections of the Isabell Glacier Trail, Jean Lunning Trail, Pawnee Pass Trail, and Niwot Cutoff Trail, offering opportunities to explore further into the Indian Peaks Wilderness.

Do I need a permit or reservation to access the Isabelle Glacier Trail?

Yes, due to its popularity, a permit system is in place for parking during peak seasons to manage crowds and preserve the natural environment. It's advisable to check the official USDA Forest Service website for the latest reservation requirements for the Brainard Lake Recreation Area.

Where can I park to access the trailhead?

The trail typically starts from the Long Lake Trailhead within the Brainard Lake Recreation Area. Parking requires a permit or reservation during peak times. It's recommended to arrive early, especially on weekends, as parking spots fill up quickly.

Is the Isabelle Glacier Trail dog-friendly?

Dogs are generally allowed in the Indian Peaks Wilderness, but specific regulations apply within the Brainard Lake Recreation Area and on trails. Always keep your dog on a leash and be prepared to pack out all waste. Check local signage for any seasonal or area-specific restrictions.

What is the best time of year to hike this trail?

The best time to hike is typically from late spring to early fall (June through September) when the snow has melted, and wildflowers are abundant. However, be prepared for rapidly changing weather conditions, even in summer. The trail can be crowded during peak summer weekends.

Are there any amenities or services near the trailhead?

The Brainard Lake Recreation Area has basic facilities like restrooms. For more extensive amenities, including cafes, pubs, and accommodation, you would need to visit nearby towns such as Nederland or Ward, Colorado.

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