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Boulder County
Eldora

Lost Lake Trail

Moderate

3.0

(1)

188

hikers

Lost Lake Trail

02:03

5.28km

240m

Hiking

Hike the 3.3-mile Lost Lake Trail in Arapaho and Roosevelt National Forests, a moderate route to a gorgeous mountain lake.

Last updated: February 26, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Roosevelt National Forest

Waypoints

A

Start point

Parking

Get Directions

1

2.71 km

Lost Lake

Highlight • Lake

Lost Lake is exceptionally popular, and for good reason. This is one of the easier ways to enjoy a high alpine lake, beautiful forest, and good sense of the Indian Peaks Wilderness without having to strain yourself. The lake has marshy banks and is surrounded by a mountain vista.

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B

5.28 km

End point

Parking

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Way Types & Surfaces

Way Types

4.16 km

596 m

493 m

< 100 m

Surfaces

4.16 km

756 m

377 m

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Elevation

Elevation

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Weather

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Monday 6 July

26°C

11°C

-- %

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Frequently Asked Questions

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

This trail is popular year-round. In spring and summer, you'll find lush greenery and wildflowers. It's also considered an enjoyable and relatively safe winter hike, with no avalanche risk directly on the trail. However, spikes can be helpful in winter conditions.

What is the terrain like on the way to Lost Lake?

The trail begins by following a river, featuring numerous river crossings and waterfalls. The initial stretch has loose rocks and gravel, leading to a steeper uphill climb. Further along, you'll find more shade. The final half-mile to the lake is mostly shaded, and the area is often described as luscious and green, especially after rain.

Is this trail dog-friendly?

The provided information does not explicitly state dog access rules for this specific Lost Lake Trail. It is always best to check the current regulations for the Indian Peaks Wilderness and Arapaho and Roosevelt National Forests before bringing your dog.

Do I need a permit or is there an entrance fee for the Arapaho and Roosevelt National Forests?

Camping is permitted at Lost Lake with a permit. For general day hiking, specific entrance fees for the Arapaho and Roosevelt National Forests or the Indian Peaks Wilderness are not mentioned, but it's advisable to check the official forest service website for the most current regulations regarding permits and fees, especially for parking at popular trailheads like Hessie.

How long does it typically take to hike this route?

The route is approximately 4.4 miles out-and-back. While individual hiking times vary, komoot estimates the duration to be around 2 hours and 3 minutes. This accounts for the moderate difficulty and elevation gain.

What kind of wildlife might I see?

Hikers on this trail have reported encountering moose, particularly in the lush, green areas. The Indian Peaks Wilderness is also home to various other wildlife, though moose are specifically mentioned as a potential sighting here.

Are there any notable natural features or points of interest along the way?

Yes, the trail follows a river with several waterfalls and river crossings. The destination, Lost Lake, is described as a gorgeous mountain lake. You may also see wildflowers, especially after rain, and enjoy the lush, green scenery deep within the mountains.

Does this route intersect with other trails?

Yes, this route utilizes sections of several official trails. You will be on parts of the Devil's Thumb Trail, Devils Thumb Bypass, Old Lost Lake, and Hessie Road during your hike.

Is the trail suitable for families with children?

The trail is rated as moderate, with an initial elevation gain that can be challenging but not overly strenuous. Its 4.4-mile out-and-back length makes it manageable for active families, but consider the loose rocks and uphill sections when planning with younger children.

Where is the trailhead located and what are the parking options?

This specific Lost Lake Trail begins via the Hessie Trailhead near Nederland, Colorado. Parking at popular trailheads like Hessie can be limited, especially during peak seasons. It's often recommended to arrive early or check for shuttle services if available, as the trail is very popular year-round.

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