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Hiking trails & Routes
United States
Colorado
Boulder County

South Saint Vrain Figure 8 Loop

Hard

4.5

(7517)

15,173

hikers

South Saint Vrain Figure 8 Loop

08:14

26.3km

630m

Hiking

The South Saint Vrain Figure 8 Loop plunges you into an enchanting woodland adventure near Boulder, Colorado, winding through diverse lodgepole pine forests and open meadows. You'll hike alongside the gurgling waters of the Saint Vrain Creek, enjoying the sounds and possibly spotting small waterfalls, before connecting to the popular Brainard Lake area. This difficult 16.3-mile (26.3 km) hike, with its 2080 feet (634 metres) of elevation gain, is a full-day commitment, typically taking 8 hours and 14 minutes.

Planning your visit requires good preparation for this challenging route. The trail is generally accessible year-round, but be ready for winter conditions like snowshoeing or microspiking if you go during colder months. The area is rich in wildlife, so keep an eye out for moose and deer, and remember it's bear country; a bear bell is recommended. Ensure you have sturdy shoes for the chunky, old-school terrain.

This loop is part of a broader network of trails, including the Sourdough and Waldrop Trails, offering options for extended exploration. It provides true immersion in nature within the Roosevelt National Forest, making it a standout for experienced hikers seeking a demanding and scenic journey away from more crowded paths.

Last updated: June 9, 2026

Tips

Temporary access restrictions

Includes segments with temporary access restrictions. Check ahead to confirm restricted segments are open to the public.

After 10.5 km for 2.69 km

Waypoints

A

Start point

Parking

Get Directions

1

9.77 km

Brainard Lake

Highlight • Lake

Brainard Lake is a beautiful alpine lake in the Indian Peaks Wilderness below the Continental Divide surrounded by subalpine forest. It is in the Brainard Lake Recreation Area, which during the summer season usually requires a reservation and a fee, but if you are on your bike you do not need to pay or reserve a time slot. Because of the area's high elevation, snow typically remains until late spring, even on the paved road to the lake.

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B

26.3 km

End point

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Way Types & Surfaces

Way Types

19.1 km

3.83 km

2.43 km

759 m

145 m

Surfaces

19.8 km

5.64 km

696 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (3,230 m)

Lowest point (2,670 m)

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Weather

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Today

Tuesday 7 July

23°C

11°C

69 %

Additional weather tips

Max wind speed: 12.0 km/h

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Frequently Asked Questions

How long does this hike typically take?

The full South Saint Vrain Figure 8 Loop is a challenging hike, generally taking between 6.5 to 9 hours to complete, depending on your pace and stops. It covers approximately 25.3 km (15.7 miles) with significant elevation gain.

What is the terrain like on this loop?

Expect a diverse and somewhat technical terrain. You'll encounter 'chunky, old-school' mountain characteristics with large embedded rocks, water bars, and potentially steeper, eroded sections. There are also areas with a rocky bed and loose footing. However, the trail also features gradual climbs and flatter stretches, winding through lodgepole pine forests, open meadows, and areas with dense tree cover. Much of the path is shaded, offering relief on warmer days.

What kind of scenery can I expect?

This loop offers an enchanting woodland adventure with magical forestland. You'll walk alongside the gurgling waters of the Saint Vrain Creek, enjoying towering aspens and ponderosa pine trees. Rushing water and waterfalls are prominent features. In autumn, the vibrant aspens are a particular highlight, while summer brings bright wildflowers. While it's a peaceful experience, don't expect grand vistas, as much of the trail is within the woods.

Where is the trailhead and what are the parking options?

The South Saint Vrain Figure 8 Loop is located near Boulder, Colorado, within the Indian Peaks Wilderness. Specific trailhead access points and parking can vary, but it's often accessed via routes that connect to the broader network of trails in the area. It's advisable to check current conditions and specific access points before heading out.

Do I need a permit or pay an entrance fee for this trail?

This trail is located within the Roosevelt National Forest. While the trail itself might not always require a specific hiking permit, accessing certain areas, especially the popular Brainard Lake Recreation Area which this trail can connect to, often requires timed entry permits or fees during peak seasons. Always check the latest regulations for the Roosevelt National Forest and Indian Peaks Wilderness before your visit.

Is this trail dog-friendly?

Yes, this trail is considered great for dogs! There are numerous opportunities for them to cool off and splash in the Saint Vrain Creek, which runs alongside much of the path. Always ensure your dog is on a leash and that you follow all wilderness regulations regarding pets.

When is the best time of year to hike this loop?

The South Saint Vrain Figure 8 Loop is accessible year-round. Summer brings bright wildflowers and the benefit of a mostly shaded path. Autumn is particularly stunning due to the vibrant aspens. In winter, it's suitable for snowshoeing or microspiking, offering a different kind of challenge and beauty.

Does this loop connect to other trails?

Yes, this loop is part of a broader network of trails. It connects to the Sourdough Trail, Waldrop Trail, and sections of the Little Raven Trail and Wapiti Trail, allowing for varied loop options and extended exploration. This connectivity also provides potential routes leading to the Brainard Lake Recreation Area.

What wildlife might I encounter?

The area is known for wildlife sightings, including moose and deer. Hikers should also be aware that they are in bear country. Birding is excellent along the route, so keep an eye out for various bird species.

Is there a way to access Brainard Lake from this trail?

Yes, a notable aspect of the South Saint Vrain Figure 8 Loop is its connection to the popular Brainard Lake Recreation Area. By utilizing this trail, you might be able to reach the lake and potentially avoid some of the common entrance fees or parking issues associated with direct access to Brainard Lake, especially during busy periods. It offers an alternative, often more strenuous, approach to this scenic destination.

Is this trail suitable for beginners?

The full South Saint Vrain Figure 8 Loop is generally rated as 'hard' or 'difficult' due to its length and elevation gain, making it less suitable for beginners. However, shorter sections of the trail can be considered moderate, offering a good challenge without being overwhelming. The technical, rocky, and loose sections require sure-footedness, so beginners should consider their fitness and experience carefully.

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