Very Difficult
5.0 (8)
Local Club: Boulder Mountainbike Alliance
Nov 17, 2025: Trail Update: South St Vrain
Nov 14, 2025: Another Step Closer to new Betasso Connector
Oct 24, 2025: Boulder County Moves One Step Closer to a Safer Boulder-to-Betasso Connection
Land Manager: City of Boulder, Colorado - Parks and Recreation
North Boulder Loop
8.3 mi 13.4 km • 372' Up 113.47 m Up • 371' Down 113.22 m Down
Boulder, 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
Heil Outer Loop from Corral TH
14.1 mi 22.6 km • 1,549' Up 472.24 m Up • 1,550' Down 472.41 m Down
Lyons, 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
Walker Ranch
7.8 mi 12.6 km • 1,516' Up 462.02 m Up • 1,510' Down 460.32 m Down
Coal Creek, CO
Heil to Picture to Hall and Back
34.1 mi 54.9 km • 3,648' Up 1111.87 m Up • 3,648' Down 1111.94 m Down
Lyons, CO
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