West of Lyons, the North Sourdough Trail is a popular mountain bike route.
To reach the southern trailhead for mountain biking on the Sourdough Trail from Nederland, head north on SR72 for 7 miles. Turn west on FS298 towards the University Of Colorado Mountain Research Station. The parking is just up the road on the left.
The Sourdough Trail connects with the South Saint Vrain Trail, the Little Raven Trail, the Waldrop Trail or the Buchanan Pass Trails.
Overall, North Sourdough Trail is the 170th most popular mountain bike trail of all 175 mountain biking rides in Colorado.