5.0
(1)
85
riders
3
rides
Gravel biking in Rabbit Mountain Open Space offers diverse terrain in Boulder County's eastern foothills. The preserve features a transition zone of grasslands and scrublands, interspersed with low hills and minimal tree coverage. Riders can expect expansive views of the Rocky Mountains to the west and the Great Plains to the east. The trails are known for drying quickly, making them accessible year-round for gravel biking.
Last updated: May 16, 2026
6
riders
Easy gravel ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
21
riders
105km
06:57
1,610m
1,610m
Hard gravel ride. Very good fitness required. You may need to push your bike for some segments of this route.

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5.0
(1)
29
riders
26.6km
01:37
160m
160m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
11
riders
50.5km
03:33
410m
410m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
12
riders
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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This is the intersection of the Saint Vrain Greenway and Left Hand Creek Trail Trailhead. The Left Hand Creek Trail will take you all the way into Boulder, so it is a great way to go from Union Reservoir into the city.
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The Open Sky Loop is a popular trail in the Lagerman Agricultural Preserve. It provides foot and cycle traffic a nice way to circumnavigate the preserve to enjoy the wildlife and landscape views.
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The Lagerman Agricultural Preserve and Reservoir is a small nature preserve that birders, boaters, picnickers, bikers, runners, and dog-walkers can all enjoy. You get great views of the foothills over farms and fields as you hike lightly-graded crushed gravel and dirt roads.
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Could love more on the trails with soft and dry graves, some portion has hard rocks.
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The Sandstone Ranch Park in Longmont, Colorado, is a vast recreational and natural area that offers a variety of amenities and activities. It spans over 313 acres, featuring athletic fields, playgrounds, picnic areas, and extensive walking and biking trails, including the St. Vrain River Greenway. The park also includes historical sites, such as the Sandstone Ranch Visitors & Learning Center, which offers educational programs about the local environment and history. Additionally, the park hosts community events and sports programs, making it a popular destination for locals and visitors alike.
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There are 4 gravel biking routes available in Rabbit Mountain Open Space on komoot, catering to various skill levels, from easy loops to more challenging long-distance rides.
The terrain in Rabbit Mountain Open Space is diverse, characterized by a transition zone of grasslands and scrublands, with some ponderosa pine forests. You'll encounter low rolling hills and varied surfaces, including sections with loose rock and steep climbs, particularly on more challenging routes like the Little Thompson Overlook Trail. The trails are known for drying quickly, making them accessible year-round.
Yes, there are easy gravel routes perfect for beginners and families. For instance, The Mountain Fountain – Pella Crossing loop from Agricultural Heritage Museum is an easy 15.4-mile (24.8 km) route that navigates through open landscapes with gentle elevation changes. Another option is the Open Sky Loop – Lagerman Preserve Trailhead loop from Seagate Technology, which is 16.5 miles (26.6 km) and leads through open grasslands and scrublands.
Rabbit Mountain Open Space is accessible year-round for gravel biking due to its trails drying quickly. However, the minimal tree coverage means significant sun exposure, so spring and fall offer more moderate temperatures. Winter riding is also possible, but always check current trail conditions.
Yes, experienced riders looking for a challenge can explore routes like the Ogallala Road – Boulder Creek Trail loop from Lyons. This difficult 65.2-mile (104.9 km) path offers extensive riding through varied terrain, including sections along Boulder Creek, with significant elevation gain.
Gravel biking in Rabbit Mountain Open Space offers expansive, scenic views. From various points, you can enjoy majestic vistas of the Rocky Mountains to the west and the vast Great Plains stretching eastward. The Little Thompson Overlook Trail, though challenging, is particularly known for providing stunning panoramic views of the area.
Rabbit Mountain Open Space generally allows dogs on trails, but they must be kept on a leash. Always check the specific regulations for the preserve on the Boulder County Open Space website for any updates or seasonal restrictions regarding pets. You can find more information at bouldercounty.gov.
Parking is available at the main trailhead of Rabbit Mountain Open Space. The preserve also offers amenities near the parking lot, including a covered shelter with BBQ grills and shaded picnic tables.
While Rabbit Mountain Open Space itself is a natural preserve, nearby towns like Lyons or Longmont offer various options for cafes, pubs, and restaurants where you can refuel after your gravel biking adventure.
The gravel biking routes in Rabbit Mountain Open Space are highly rated by the komoot community, with an average score of 5.0 stars. Reviewers often praise the diverse terrain, the expansive views of both the Rocky Mountains and the Great Plains, and the accessibility of the trails year-round due to their quick-drying nature.
Yes, Rabbit Mountain Open Space is rich in wildlife. You might spot prairie dogs, deer, elk, and various bird species such as falcons, hawks, owls, and golden eagles. The Eagle Wind Trail, though primarily for hiking, is particularly noted for birdwatching and can be accessed from the main trail system.
Generally, there are no specific permits or fees required for day-use activities like gravel biking in Rabbit Mountain Open Space. However, it's always a good idea to check the official Boulder County Open Space website for the most current regulations and any potential changes before your visit. You can find more information at bouldercounty.gov.


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