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United States
Colorado
Boulder County

Forsythe Canyon Trail

Moderate

3.2

(7)

47

runners

Forsythe Canyon Trail

00:26

3.89km

100m

Running

Jog the moderate 2.4-mile Forsythe Canyon Trail through a wooded canyon to a waterfall and Gross Reservoir, gaining 335 feet.

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

109 m

Forsythe Canyon Trailhead

Highlight • Trail

The parking lot is packed gravel with an informational signboard and restrooms. From here you can follow the gravel road south or run into Forsythe Canyon along packed singletrack.

Tip by

2

1.94 km

Gross Reservoir

Highlight • Lake

The reservoir provides opportunities for fishing (including ice fishing), hiking, canoeing, kayaking, and some camping. No water-contact sports such as swimming or wading are allowed.

This is an amazing spot …

Tip by

B

3.89 km

End point

Parking

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Way Types & Surfaces

Way Types

3.89 km

Surfaces

3.75 km

138 m

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Elevation

Elevation

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Weather

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Thursday 9 July

26°C

12°C

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Frequently Asked Questions

Where can I park for the Forsythe Canyon Trail?

Parking is available at the Forsythe Canyon Trailhead. It's advisable to arrive early, especially on weekends, as this trail can be a popular alternative to more crowded Boulder trails.

Is the Forsythe Canyon Trail dog-friendly?

Yes, the trail is welcoming to dogs. Please ensure your dog remains on a leash at all times. There are opportunities for dogs to cool off in various water spots along the creek.

When is the best time of year to visit this trail?

The Forsythe Canyon Trail is beautiful year-round. The creek runs noisily in spring, and the pine and aspen forests are particularly stunning in late fall. It offers a shaded experience, which is pleasant on warmer days. Winter conditions may require appropriate gear.

Are there any permits or fees required to use the Forsythe Canyon Trail?

The Forsythe Canyon Trail is located within the Arapaho and Roosevelt National Forests. Generally, there are no specific permits or entrance fees required for day use on this trail. However, it's always a good idea to check the official USDA Forest Service website for any current regulations or alerts before your visit.

What is the terrain like on the Forsythe Canyon Trail?

The trail is largely relatively flat, making it suitable for jogging for significant portions. However, it does feature a few slightly technical areas with rocks. As you descend towards Gross Reservoir, it becomes rockier, including at least one section that requires some easy scrambling over a rock wall.

What natural features and sights can I expect to see?

You'll jog along a shaded stream through a wooded, rocky canyon. A highlight is a small, picturesque waterfall, estimated to be between 15 and 25 feet high, found approximately one mile in. The creek forms small, picturesque waterfalls and cascades. The trail culminates at the far northwestern tip of Gross Reservoir, offering stunning views of its clear blue water.

How difficult is this trail for jogging?

The trail is generally rated as easy to moderate. Many find it relatively flat and accessible. The primary physical challenge is the return journey, as the trail is predominantly downhill on the way out, meaning the return is uphill. The section requiring scrambling over a rock wall also adds to the challenge.

Is the Forsythe Canyon Trail a loop or an out-and-back route?

The Forsythe Canyon Trail is primarily an out-and-back route, leading you to the scenic Gross Reservoir and back.

Does this route connect with other trails?

Yes, while following the main Forsythe Canyon Trail, the route also passes through sections of the Winiger Ridge Road.

What kind of wildlife might I encounter?

The trail winds through pine and aspen forests and follows a stream, creating a diverse habitat. While specific wildlife sightings vary, you might spot various birds, small mammals, and potentially deer. Always be aware of your surroundings and respect wildlife.

Are there any amenities or services nearby?

The trail offers a more remote and less crowded atmosphere. For amenities like cafes, pubs, or accommodation, you would need to head to nearby towns such as Nederland or Boulder, Colorado.

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