In 2020 the San Diego UltraRunning Friends (SURF) is presenting a SURF Virtual Grand Prix Series! In December 2020 there are three section options along the Noble Canyon 50k course. 

Note that you can start and finish at ANY trailhead.

Here are details about each option:

Option 1.) 31 miles, The Entire course. In 2020 we cut out the first and last mile along the asphalt road in Pine Valley. Also, note you will return to the Penny Pines trailhead twice. 

Option 2.) 20 miles out-and-back on the Noble Canyon trail. Lower Noble Canyon trailhead to Penny Pines and back.

Option 3.) 10 miles upper loop. Penny Pines to Penny Pines.

Helpful Links:

Printable map and turn-by-turn directions

GPX file of the upper loop 

Lower Noble Canyon Trailhead

Penny Pines trailhead

Here is the elevation profile from 2017. The 2020 course is very similar: