Sourdough Trail (South)
Sourdough South is a rolly polly lungbuster, traveling north-south and paralleling (but nowhere near) the Peak to Peak Highway. Solitude and suffering await you... ok, it's really not that bad if you're mentally prepared for high altitude riding with some loose rocks thrown in there.
You can start this trail from the south at the CU Research Center / Rainbow Lakes trailhead, and from the north at the Brainard Lake trailhead. If you cross Brainard Lake Road, then the Sourdough trail continues - we call that section Sourdough North because this section of trail has a pretty different character from Sourdough South.
|Sourdough Trail (South) GPX File||142.45 KB|
|Sourdough Trail (South) Google Earth File||5.28 KB|
View Boulder County Trailheads in a larger map