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Difficult
“A fun, loose, rocky descent from Road 2321 to South Sourdough Trail - Southern Half. ”
0.6
Miles1.0
KMSingletrack
Difficult
Singletrack
Difficult
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: USFS - Boulder Ranger District Office
North Sourdough and St. Vrain Loop
5.4 mi 8.7 km • 641' Up 195.34 m Up • 650' Down 198.23 m Down
Nederland, CO
Switzerland Trail Gold Hill Road Loop
25.3 mi 40.7 km • 1,949' Up 593.94 m Up • 1,948' Down 593.78 m Down
Nederland, CO
South Saint Vrain Figure 8
16.3 mi 26.2 km • 2,072' Up 631.58 m Up • 2,086' Down 635.74 m Down
Nederland, CO
Ceran St. Vrain to Miller Rock
6.2 mi 9.9 km • 897' Up 273.36 m Up • 897' Down 273.36 m Down
Nederland, CO
Sherwood From Nederland
5.8 mi 9.3 km • 789' Up 240.44 m Up • 793' Down 241.57 m Down
Nederland, CO
North Boulder Loop
8.3 mi 13.4 km • 372' Up 113.47 m Up • 371' Down 113.22 m Down
Boulder, CO
Unknown
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