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.
Last updated: June 29, 2026
25
riders
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.
24
riders
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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26
riders
Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
7
riders
Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
95
riders
17.5km
01:40
290m
290m
Moderate mountain bike ride. Great for any fitness level. Advanced riding skills necessary.
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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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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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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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A nice spot to take a quick break. Maybe even dip your feet in the water for a minute.
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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.
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.
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 β Arthur's Rock loop from Horsetooth Mountain Open Space, which covers over 17 miles with substantial climbing.
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.
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.
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 β Arthur's Rock Trailhead loop is another well-regarded option, offering varied terrain over nearly 9.2 miles.
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.
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.
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.
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.
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.
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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