Intermediate/Difficult
5.0 (11)
Local Club: Boulder Mountainbike Alliance
Feb 22, 2024: Join us in Shaping Colorado’s Outdoor Future
Feb 1, 2024: Eagle-Sage Trail Closures
Jan 31, 2024: Coalton Trail Reopening Feb. 1
Land Manager: City of Boulder, Colorado - Parks and Recreation
Dirty Bismark
15.7 mi 25.2 km • 933' Up 284.36 m Up • 929' Down 283.21 m Down
Superior, CO
Gunbarrel to Niwot: Cottontail Trail - Niwot Loop - LoBo Trail
15.9 mi 25.5 km • 496' Up 151.09 m Up • 567' Down 172.87 m Down
Gunbarrel, CO
Down and Dirty
18.8 mi 30.3 km • 1,068' Up 325.44 m Up • 1,066' Down 324.88 m Down
Superior, CO
Marshall Mesa - Doudy Draw Loops
10.4 mi 16.8 km • 921' Up 280.63 m Up • 923' Down 281.18 m Down
Superior, CO
Sugarloaf to Gordon Gulch Loop
13.5 mi 21.7 km • 1,590' Up 484.64 m Up • 1,607' Down 489.88 m Down
Boulder, CO
Rocky Flats NWR North
6.5 mi 10.4 km • 253' Up 77.06 m Up • 252' Down 76.87 m Down
Superior, CO
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