Lake Isabelle Trail Route Guide

Route Description for Lake Isabelle Trail

Lake Isabelle Trail Guide | Indian Peaks Wilderness
The Lake Isabelle Trail is one of the most scenic hikes in the Indian Peaks Wilderness. This popular route leads from the Long Lake trailhead to the stunning alpine basin of Lake Isabelle, with views of Isabelle Glacier and surrounding high peaks.

Start the Lake Isabelle Trail by finding the trailhead with the same title in the Brainard Lake Recreation Area. From the trailhead, the trail gradually ascends through the forest until it reaches the tip of Long Lake. At Long Lake the views open up and you should be able to see Isabelle Glacier and the surrounding Indian Peaks. Stay on the north side of the lake as you hike parallel to the shore.

Route to Lake Isabelle

You will understand why it is called Long Lake as you continue to hike along the shore further back into the mountains. Past Long Lake, the trail gains elevation, and slowly ascends above the tree line. A few small switchbacks take you to the amazing Lake Isabelle with views of the surrounding mountains. The approach to Lake Isabelle is gradual and well-defined, making it a rewarding destination for many hikers.

You can appreciate Lake Isabelle for a moment before the final ascent. You’ll take some exciting switchbacks up and up until you find a pool that is part of the South Saint Vrain Creek. From here you can look up to Navajo Peak (4,087 m). It’s the prominent mountain in the middle of the mountain cirque. When you’ve had your fill of great mountain views above Lake Isabelle, head back down the way you came.

Hiking Trail Highlights at Lake Isabelle

Lake Isabelle

Lake Isabelle

Lake Isabelle is one of the prettiest lakes in the Indian Peaks Wilderness, located just 3.4 km from the Long Lake trailhead in the Brainard Lake Recreation Area. Lake Isabelle sits at the heart of a stunning alpine valley, surrounded by imposing, craggy peaks and sparsely dotted green trees.

This beautiful part of the Indian Peaks Wilderness Area is very popular, and once you set out toward Lake Isabelle, you’ll soon understand why. In spring and summer the trail leading to Lake Isabelle is lined with colorful wildflowers, and the snow-capped peaks provide the perfect backdrop for a relaxed picnic by the water.

Visitors should note that Lake Isabelle is actually a reservoir, and in August it is often drawn down to provide water for local agriculture. We recommend visiting Lake Isabelle before August or in late September to enjoy the lake at its fullest.

Isabelle Glacier

The Isabelle Glacier is located a quarter of a mile southwest of Shoshoni Peak, one of the towering mountains that looks over Lake Isabelle. The glacier sits on the east side of the Continental Divide, mirrored by Fair Glacier, which occupies a similar position on the west side.

The Isabelle Glacier is the source of the South Saint Vrain Creek, and the route beyond Lake Isabelle toward the glacier passes through a wet alpine valley with meadows and small waterfalls. The views from above Lake Isabelle toward Navajo, Apache, and Shoshoni peaks are especially dramatic.

Navajo Peak

The towering Navajo Peak dominates the skyline above Lake Isabelle. Standing at an elevation of 4,087 m above sea level, this distinctive, craggy mountain is a powerful draw for mountaineers and hikers, although summiting it is a significant challenge.

Although it just misses out on being classed as one of Colorado’s iconic 14ers, Navajo Peak should not be taken lightly. It is the third highest mountain in the Indian Peaks Wilderness and is known as the site of a fatal plane crash in January 1948. Debris from the wreckage can still be seen on the mountain.

Planning Your Visit to Lake Isabelle

Parking and Access

Lake Isabelle is accessed from the Long Lake trailhead within the Brainard Lake Recreation Area. Seasonal road closures typically affect access in winter, and timed-entry or reservation systems may apply during peak summer months. Arrive early, especially on weekends, as Lake Isabelle is one of the most popular hikes in the area.

Best Time to Hike to Lake Isabelle

The best time to visit Lake Isabelle is from late spring through early fall, when snow has melted from the trail and wildflowers are in bloom. Early summer often offers the most vibrant alpine scenery around Lake Isabelle. In autumn, cooler temperatures and fewer crowds make for a quieter experience.

Is Lake Isabelle Family-Friendly?

The hike to Lake Isabelle is suitable for many families thanks to its gradual elevation gain and well-maintained trail. However, the final section above Lake Isabelle toward the glacier is steeper and more rugged.

Are Dogs Allowed at Lake Isabelle?

Dogs are generally permitted in the Indian Peaks Wilderness, including the Lake Isabelle area, but they must be kept under control. Check current regulations before visiting, as seasonal restrictions can apply.

Frequently Asked Questions About Lake Isabelle

How long is the hike to Lake Isabelle?

Lake Isabelle is approximately 3.4 km from the Long Lake trailhead, making it a moderate out-and-back hike for most visitors.

Do you need a reservation to visit Lake Isabelle?

Access to Lake Isabelle is through the Brainard Lake Recreation Area, which may require seasonal reservations or timed entry during peak months. Always check current access requirements before your trip.

Is Lake Isabelle crowded?

Lake Isabelle is one of the most popular destinations in the Indian Peaks Wilderness. Expect higher visitation during summer weekends and holidays. Visiting early in the morning or later in the season can help avoid peak crowds.

What’s New at Lake Isabelle Trail in 2026

There are no major changes to access, route details, or general trail conditions for 2026. Lake Isabelle remains accessible via the Brainard Lake Recreation Area, subject to standard seasonal access and parking regulations. Visitors should continue to check current conditions and reservation requirements before heading out.

Looking to explore more of Colorado’s alpine landscapes? Browse our guided hiking tours for multi-day adventures in the Rockies.