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United States
Colorado
Larimer County

Horsetooth Mountain Open Space

The best MTB trails in Horsetooth Mountain Open Space

5.0

(6)

1,025

riders

51

rides

Mountain bike trails in Horsetooth Mountain Open Space offer diverse landscapes across 2,711 acres, with elevations ranging from 5,430 to 7,255 feet. The area features a mix of grasslands, mountain mahogany shrublands, and striking red cliffs, providing varied terrain for riders. Iconic natural features like Horsetooth Rock and Horsetooth Falls add to the scenic appeal. The open space is situated west of Horsetooth Reservoir, offering expansive views from many points.

Best mountain bike trails in Horsetooth Mountain Open Space

  • The most popular mountain bike trail is Stout Trail – Arthur's Rock Trailhead loop from Horsetooth Mountain Open Space, a 9.2 miles (14.8 km) trail that takes 1 hour 31 minutes to complete. This difficult route features significant elevation gain and varied terrain.
  • Another top favourite among local mountain bikers is Blue Sky and Indian Summer Loop, a moderate 10.9 miles (17.5 km) path. This loop is known for its low-grade switchbacks and flowy descent through scenic landscapes.
  • Local mountain bikers also love the Suberb Singletrack Loop, a 21.5 miles (34.6 km) trail leading through diverse ecosystems and offering panoramic views, often completed in about 3 hours 42 minutes.
  • Mountain biking in Horsetooth Mountain Open Space is defined by diverse ecosystems, red cliffs, and tremendous Front Range views. The extensive trail network offers options for various skill levels, from moderate terrain to challenging ascents and thrilling descents.
  • The routes in Horsetooth Mountain Open Space are highly rated by the komoot community with an average score of 5.0 stars from over 7 reviews. More than 1000 mountain bikers have used komoot to explore Horsetooth Mountain Open Space's varied terrain.

Last updated: June 29, 2026

25

riders

#1.

Stout Trail loop from Horsetooth Mountain Open Space

9.94km

01:09

330m

330m

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

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Hard

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Hard
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Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Hard

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Hard

95

riders

Moderate mountain bike ride. Great for any fitness level. Advanced riding skills necessary.

Moderate
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Tips from the Community

Jamie S.
July 5, 2024, Indian Summer Loop

The Indian Summer Trail is a short, fun loop off of the main Blue Sky Trail. Most ride this loop clockwise, ascending a few hundred feet of low-grade switchbacks before reaching a flowy descent.

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The Blue Sky Trail is a generally casual, super fun trail along a ridge, just south of Horsetooth Reservoir. This long trail runs north-south from Horsetooth Reservoir, through Rim Rock Open Space to the Devil's Backbone Open Space. This section of trail begins at the trailhead near Horsetooth and ends where the Indian Summer Loop begins. There is a set of steps in this section of trail that most walk, but advanced riders looking to challenge themselves might be able to find a line down. Other than this short obstacle, this section of the Blue Sky Trail doesn't have any very steep grades; it is flowy and fun with lots linkups with other trails available.

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Scott
December 6, 2023, Rim Rock Open Space

Explore the scenic Rimrock Open Space. Witness breathtaking red cliffs & diverse wildlife, from soaring raptors to curious mule deer.

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The Arthurs Rock Trailhead is located at the very end of Lodgepole Drive. There is a large parking area, trail information, and vault toilets. From this trailhead you can access popular trails like the Arthurs Rock Trail, the South Valley Loop, and the Overlook Trail. This lot can fill up quickly, especially on beautiful weekends in the spring, summer, and fall so be sure to arrive early and try to carpool with a hiking buddy!

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The South Valley Loop is an incredibly popular hiking and mountain biking trail on the southern end of Lory State park. This half of the loop is on the reservoir side and generally flat with rolling hills through a meadow. You get great views of the hills where Arthur's Rock can be found across the valley from striking red cliffs closer to the water.

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Jamie S.
July 28, 2023, Dixon Cove

Dixon Cove is one of many narrow coves and inlets along the eastern side of Lory State Park. You can walk down to the water and cool off on hot summer days in Horsetooth Resivior. You also get nice views of Arthur's Rock and the unique red ridge line in the park.

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South valley trail loop is an easy, fast and flowing singletrack loop with great views of the Horsetooth Reservoir.

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Shawn Vogler
March 28, 2022, Dixon Cove

A nice spot to take a quick break. Maybe even dip your feet in the water for a minute.

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Frequently Asked Questions

How many mountain bike trails are available in Horsetooth Mountain Open Space?

Horsetooth Mountain Open Space offers a wide network of trails, with over 50 mountain bike routes available for exploration. These trails cater to various skill levels, from moderate to difficult.

Are there easy mountain bike trails suitable for beginners or families in Horsetooth Mountain Open Space?

Yes, there are several easier options. While many trails are moderate to difficult, the area does offer some routes suitable for beginners or families. For example, the Dixon Cove loop from Clarendon Hills is a moderate route that provides a good introduction to the area's terrain.

What are some challenging mountain bike trails for advanced riders?

Advanced riders will find plenty of challenging terrain. The Suberb Singletrack Loop is a difficult 21.5-mile trail with significant elevation changes, leading through diverse ecosystems and offering panoramic views. Another challenging option is the Stout Trail – Arthur's Rock loop from Horsetooth Mountain Open Space, which covers over 17 miles with substantial climbing.

What kind of natural features and viewpoints can I expect to see along the mountain bike trails?

The trails offer diverse landscapes and stunning viewpoints. You'll encounter grasslands, mountain mahogany shrublands, and striking red cliffs. Iconic natural features include Horsetooth Rock, which provides fantastic panoramic views of Horsetooth Reservoir and the Front Range. You can also visit Horsetooth Falls, a picturesque seasonal waterfall, particularly impressive in late spring.

What is the best time of year for mountain biking in Horsetooth Mountain Open Space?

The best time to visit for mountain biking is generally in the spring and fall when temperatures are milder. Late spring is particularly good for seeing Horsetooth Falls at its fullest due to snowmelt. While trails are accessible year-round, summer can be hot, and winter may bring snow and ice, affecting trail conditions.

Are there any loop trails for mountain biking in the area?

Yes, Horsetooth Mountain Open Space features several excellent loop trails. A popular choice is the Blue Sky and Indian Summer Loop, known for its low-grade switchbacks and flowy descent. The Stout Trail – Arthur's Rock Trailhead loop is another well-regarded option, offering varied terrain over nearly 9.2 miles.

What do other mountain bikers enjoy most about the trails in Horsetooth Mountain Open Space?

The area is highly rated by the komoot community, with an average score of 5.0 stars. Reviewers often praise the diverse ecosystems, the striking red cliffs, and the tremendous Front Range views. The extensive trail network and varied terrain, from challenging ascents to thrilling descents, are also frequently highlighted.

Is public transport available to Horsetooth Mountain Open Space, especially if I have a bike?

While direct public transport options specifically designed for bikes to the trailhead might be limited, it's advisable to check local Fort Collins transit services for routes that get you close. However, most visitors typically access the open space by car, often using bike racks.

Are there specific parking areas for mountain bikers at Horsetooth Mountain Open Space?

Yes, Horsetooth Mountain Open Space has designated parking areas. The main parking lot at the Horsetooth Mountain Open Space trailhead is a primary access point for mountain bikers. It's recommended to arrive early, especially on weekends, as parking can fill up quickly.

Do I need a permit or pay an entrance fee to mountain bike in Horsetooth Mountain Open Space?

Yes, a pass is required to enter Horsetooth Mountain Open Space. You can purchase a daily pass or an annual pass. For the most current information on fees and permits, it's best to check the official Larimer County Natural Resources website: larimer.gov.

Are there any cafes or pubs near Horsetooth Mountain Open Space for after a ride?

While Horsetooth Mountain Open Space itself is a natural area, the city of Fort Collins is just a short drive away. Fort Collins offers a wide array of cafes, breweries, and restaurants where you can refuel and relax after your mountain biking adventure.

What kind of wildlife might I encounter on the trails?

Horsetooth Mountain Open Space is home to diverse wildlife. You might spot deer, elk, various bird species, and smaller mammals. Keep an eye out, especially during dawn and dusk, and always maintain a respectful distance from any animals you encounter.

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