North Fork 50

 The North Fork 50 Mile/50K is 100% trails, mainly single track and some double track, starting and finishing along lovely Buffalo Creek, in the mountains about 50 miles southwest of Denver.

This is a pure ultra, a very special and unique race, deliberately kept small so each runner gets personal attention.

There are no non-ultra distances and no crowds on the beautiful trails.

https://www.aravaiparunning.com/bear-chase-series/north-fork-ultras/