4.7
(41)
377
riders
40
rides
Gravel biking in Rocky Flats National Wildlife Refuge offers an extensive network of trails across 5,237 acres of rolling prairie grasslands. The terrain primarily consists of dirt and packed gravel paths, providing a varied riding experience. Riders can expect views of the Front Range of the Rocky Mountains, woodlands, and wetlands, including South Woman Creek and Upper and Lower Church Lakes. This unique Front Range landscape features diverse ecological elements.
Last updated: May 1, 2026
19
riders
24.9km
01:49
290m
290m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
21
riders
36.9km
02:10
350m
350m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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11
riders
67.9km
03:53
500m
500m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
8
riders
17.1km
01:06
200m
200m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
6
riders
35.1km
02:35
440m
440m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Rocky Flats National Wildlife Refuge
The bridge over Indiana St connecting Westminster Hills Open Space to Rocky Flats is now open.
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Adler-Fingru Open Space is a 55.7-acre area that was once used for crop production and livestock grazing. Ownership of the space is divided three ways among the cities of Boulder, Louisville, and Lafayette. This property is under an agricultural lease, so access to the public is limited to only the Coal Creek Trail that passes through the space.
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This is a nice packed dirt and gravel connector trail, with views of the range from South Bolder Peak to Green Mountain and the Flatirons. Best to avoid this track if there has been recent rain or snow.
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Mayhoffer Trail stretches 2.7 miles over gravel and dirt and connects users to other regional trails with awesome views of the surrounding plains and foothills.
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View looking East on the Greenway Trail. The bench might come in handy too, nice view of the Flatirons.
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Rocky Flats National Wildlife Refuge offers a network of over 50 gravel bike trails. These routes cater to various skill levels, with options ranging from easy to more challenging rides across the refuge's diverse landscape.
The terrain primarily consists of dirt and packed gravel paths, characterized by rolling plains and hills. While many routes offer a moderate challenge, there are also easier options for beginners and more difficult trails for experienced riders. Overall, 6 routes are considered easy, 37 are moderate, and 14 are difficult.
The trails in Rocky Flats National Wildlife Refuge are highly rated by the komoot community, with an average score of 4.7 stars from over 50 reviews. Riders frequently praise the stunning Front Range views, the diverse landscapes including prairie grasslands and wetlands, and the opportunity for wildlife viewing. Many appreciate the well-maintained dirt and packed gravel surfaces ideal for gravel biking.
Yes, several routes offer points of interest. For instance, the Lindsay Ranch Loop Trail – Greenway Trail loop notably features the historic Lindsay Ranch barn. Throughout the refuge, you'll also encounter interpretive panels providing insights into the area's wildlife and history, as well as picturesque views of South Woman Creek and the Upper and Lower Church Lakes.
Rocky Flats National Wildlife Refuge is a haven for wildlife, home to over 230 species. While biking, you might spot elk, deer, various raptors and songbirds, and coyotes. The refuge also protects the federally threatened Preble's meadow jumping mouse. Keep an eye out, especially during quieter times, for excellent wildlife viewing opportunities.
Yes, the refuge offers trails suitable for families, particularly those looking for a moderate challenge. The rolling terrain and well-maintained gravel paths provide an engaging experience without being overly strenuous. While specific 'easy' family routes aren't highlighted, the overall network includes options that can be enjoyed by families with varying skill levels. The refuge's interpretive panels also add an educational element for younger riders.
For specific regulations regarding dogs on trails within Rocky Flats National Wildlife Refuge, it's best to consult the official refuge website. National Wildlife Refuges often have specific rules to protect wildlife and habitats, which may include restrictions on pets. You can find more information on their visitor activities page: fws.gov/refuge/rocky-flats/visit-us.
The refuge's trails are generally open year-round for gravel biking. However, the best time to visit often depends on personal preference. Spring and fall offer pleasant temperatures and vibrant scenery, with many plants blooming from spring through fall. Winter can also be an option, though conditions may vary with snow and ice. Always check local weather conditions before heading out.
Yes, the refuge features several loop trails that are popular among gravel bikers. The Lindsay Ranch Loop Trail – Greenway Trail loop is a moderate 14.3-mile option that showcases diverse refuge landscapes. Other loops like the Walnut Creek Loop and Woman Creek Loop are also mentioned as part of the refuge's trail network, providing varied experiences.
While specific parking areas aren't detailed in the route descriptions, the refuge generally provides designated parking for visitors. For the most accurate and up-to-date information on parking facilities and access points, it is recommended to check the official Rocky Flats National Wildlife Refuge website before your visit. You can find general visitor information at fws.gov/refuge/rocky-flats/visit-us.
While the refuge itself offers 15 miles of trails, there are future plans to expand connectivity. These plans include linking the Rocky Mountain Greenway Trail to Boulder and Jefferson County trails, and potentially connecting to other national wildlife refuges and even Rocky Mountain National Park through municipal connections. This will significantly expand long-distance biking opportunities in the future.
The refuge preserves a striking Front Range landscape. You'll ride through rolling plains, prairie grasslands, woodlands, and wetlands. A significant natural feature is the presence of rare xeric tallgrass prairie, a globally important ecosystem. Vistas of the Front Range of the Rocky Mountains are a constant backdrop, and you'll also see South Woman Creek and the Upper and Lower Church Lakes.


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