4.8
(45)
430
riders
34
rides
Gravel biking around Thornton, Colorado, benefits from an extensive network of over 140 miles of trails and more than 2,500 acres of parks and open space. The terrain primarily features high plains landscapes, open fields, and multi-use paths, often providing views of the Front Range mountains. This area includes significant natural preserves like the 15,988-acre Rocky Mountain Arsenal National Wildlife Refuge, which offers dirt roads suitable for gravel cycling. The region's trail systems connect various open spaces and parks, providing…
Last updated: August 22, 2026
3.6
(5)
88
riders
43.4km
03:58
130m
130m
The Rocky Mountain Arsenal National Wildlife Refuge Perimeter Trail offers a unique gravel biking experience, transporting you from urban fringes to a thriving prairie ecosystem. You'll traverse wide, non-technical gravel…
5.0
(1)
21
riders
51.2km
02:55
430m
430m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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5.0
(1)
23
riders
37.7km
02:02
230m
230m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
11
riders
40.0km
02:31
110m
110m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
7
riders
19.7km
01:25
60m
50m
Easy gravel ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
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Sheltered picnic area on the edge of Rocky Mountain Aresenal, with far views of the mountains and nearby metro area. There is also an ultra minimalistic Japanese style rock garden, consisting of 3 small rocks and a shurb.
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The Henderson Hill trail is a short out and back paved trail to a low rise in old Rocky Mountain Arsenal area, now a wildlife refuge. Even though the difference in elevation is minimal the view is far reaching to the east and south. You can actually reach this spot using only bikepaths (route5) from Commerce City. See this ride https://www.komoot.com/tour/2710436405?share_token=aTyj2lJ1YHiQOhPskXyq8prHxb5AoOId67IJs0FNb2tJwCStGp&ref=wtd. The way that this ride got around the east side of the refuge is not recommended though.
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Warembourg Open Space is a peaceful spot along Coal Creek and the Coal Creek Regional Trail, shaped through conservation efforts by Boulder County, Louisville, and Lafayette. Established in 1999 and 2003, it offers hikers a lovely riparian habitat with cottonwoods, wildlife, and scenic creekside views—a perfect place for an easy, immersive walk close to nature.
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After losing their nest to a lightning strike in August, it was unclear which location the eagles would choose for their to new nest. With limited suitable nesting trees in the area—including one along the trail near their previous nest—they have now settled in a tree here, near the southern end of S. 104th St.
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This trail has a soft surface, so it may be a challenge for super-skinny tires. It's otherwise a very pleasant ride, though. If you don't like biking past horses, this is a good choice, as equestrian users aren't allowed on most of this trail's 14-mile length.
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Henderson Hill is an elevated concrete platform and gives a great view of downtown Denver.
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The Perimeter trail is the longest trail managed by the Rocky Mountain Arsenal National Wildlife Refuge. It stretches 14 miles in one direction and can be combined with some other trails in the refuge to create a huge loop. This is one of just a couple trails leaving from the refuge that allows dogs on its paths. Know that you are sometimes close to the road, though, so you won't want to let your pup run free.
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Yes, Thornton offers a variety of gravel bike trails suitable for different ability levels. Many routes traverse open plains and multi-use paths, making them accessible. For example, the Rocky Mountain Arsenal National Wildlife Refuge Perimeter Trail is rated as moderate and offers a relatively flat experience with wildlife viewing, which can be enjoyable for families. The extensive trail system includes many sections that are not overly technical.
Gravel biking around Thornton offers stunning views of the Front Range mountains and diverse natural landscapes. Routes like the Rocky Mountain Arsenal National Wildlife Refuge Perimeter Trail provide opportunities for wildlife spotting. You can also find natural water sources like lakes and reservoirs. For instance, Standley Lake and Lowell Ponds Wildlife Area are notable attractions in the vicinity, offering scenic spots to explore.
Thornton boasts an extensive network of over 140 miles of trails and more than 2,500 acres of parks and open space. This includes significant natural preserves like the 15,988-acre Rocky Mountain Arsenal National Wildlife Refuge. The trail systems connect various open spaces and parks, providing diverse riding environments and numerous opportunities for gravel biking.
The gravel biking routes in Thornton are highly rated by the komoot community, with an average score of 4.8 stars from over 30 reviews. More than 400 gravel bikers have used komoot to explore Thornton's varied terrain. Riders often praise the extensive trail systems, open plains, and the scenic views of the Front Range.
Yes, several popular gravel biking routes in the Thornton area are designed as loops. For example, the Coal Creek Trail – View of Longs Peak loop from The Field Open Space and the Adler-Fingru Open Space – Aquarius Open Space loop from The Field Open Space are both excellent circular options, allowing you to start and finish at the same point.
The Front Range area, including Thornton, generally offers good gravel biking conditions for much of the year. Spring and fall often provide pleasant temperatures and vibrant scenery. While winter can bring snow, many trails remain accessible, especially on milder days, though conditions can vary. It's always advisable to check local weather and trail conditions before heading out during colder months.
Thornton and its surrounding areas offer various access points to the trail system. While specific public transport routes to every trailhead may vary, RTD Denver provides bus services in the region. Many parks and open spaces, such as those providing access to the Rocky Mountain Arsenal National Wildlife Refuge or Coal Creek Trail, typically have designated parking areas for visitors. For detailed information on parking and public transport options for specific trailheads, it's recommended to consult local city and park resources, such as the Thornton Parks and Recreation website.
Given Thornton's extensive network of over 140 miles of trails and numerous open spaces, it's possible to find less crowded options, especially during off-peak hours or by exploring some of the lesser-known connections within the system. While popular routes like the Rocky Mountain Arsenal Perimeter Trail can see more traffic, the sheer volume of trails means you can often find quieter sections or alternative paths to enjoy the solitude of the high plains landscape.
Many of Thornton's parks and open spaces feature multi-use trails and pedestrian paths where dogs are permitted, typically on a leash. For example, the Rocky Mountain Arsenal National Wildlife Refuge has specific regulations regarding pets. It's always best to check the specific rules for each trail or open space you plan to visit, as regulations can vary. Ensure your dog is comfortable with the distance and terrain.
Thornton and its neighboring communities offer a range of amenities, including cafes, pubs, and accommodation options. Areas near major trail access points, such as those around the Rocky Mountain Arsenal National Wildlife Refuge or the Coal Creek Trail, will have various dining and lodging choices. You'll find options ranging from quick bites to sit-down restaurants, as well as hotels and other lodging facilities to suit different preferences.
The gravel biking routes in Thornton cater to a range of difficulty levels. While the majority of the 27 available tours are rated as 'moderate', there are also 'easy' and 'difficult' options. For instance, the Greenway Trail – Meadowlark Trail loop from Jefferson Academy Elementary is classified as difficult, offering a more challenging ride with significant elevation changes. This variety ensures that both casual riders and experienced gravel bikers can find suitable routes.


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