Headwaters Trail Runs are 56k, 31k, and 10k trail running events held in the Klamath Mountains west of Mount Shasta City, CA.  These three scenic trail runs are named after the headwaters of the Sacramento River.

The 56k and 31k races are scenic, mountainous loop courses (the 56k adds a 15-mile out-and-back section to the 31k loop).  They are run entirely on single-track trails and dirt forest roads that wind up, down, around, and through the rugged mountains that claim host to the crystal-clear headwaters of California's longest river. Both races include miles on the historic Sisson-Callahan National Recreation Trail. 

The 10k race is a relatively flat, fast loop on the lake trail that circles the forested shores of picturesque Lake Siskiyou.  The Lake Siskiyou Trail is a favorite trail for local trail runners of all abilities.

The magnificent backdrop for all runs is majestic Mt. Shasta (14,179' elev.), the most massive of all the Cascade volcanoes, and Mt. Eddy (9025' elev.), the highest peak in the Klamath Mountains.  Runners are rewarded with clean mountain air, challenging terrain, fully-stocked aid stations, and a welcoming and enthusiastic volunteer staff.

All participants receive a hearty, organic post-race meal made by local chef Jacqueline Hertzog - arguably the best post-race meal anywhere!  Participants also receive a commemorative race t-shirt, and a unique finisher's medal.

Headwaters Trail Runs is a cupless event, and runners will need to carry with them a means to get drink at the aid stations.  We do our best to reduce the waste generated by this event in all aspects.  Please consider bringing your own reusable plate, utensils, and cup for the post-race meal. 



Registration fees include race entry, event shirt, post-race food and beverage, and finisher's gift.



Top 3 overall female and male receive awards from our sponsors. Top 3 female and male in each 10-year age group receive age group awards.



For additional race information, including course maps and elevation profiles, please visit our website:

Upcoming Races

Sep 25 2021
56 KM
8,000 8,000 ft.
Lollipop Course
4 Aid Stations
10 :30 Cutoff
4 Elevation Rating
Very hilly, ~7500-12,500 feet in 50 miles
4 Surface Rating
Substantial rocks, roots and/or ruts


56 KM View course top times

Date Finishers Top Result Top Result (F)
09/26/20 Race Cancelled
09/28/19 33 4:24:35 5:02:31
09/29/18 38 4:30:32 5:08:31
09/30/17 36 4:44:20 5:43:48
10/01/16 37 4:55:35 5:12:38
08/22/15 32 4:50:10 5:46:33
08/23/14 55 4:23:57 4:56:55
08/24/13 48 3:52:38 4:22:03
We try to keep the most accurate information about this race, but changes do happen. Always visit the official race website for the most up to date information. If you see an error, please let us know

Tussey Mountainback 50 Miler

  • Oct 31, 2021
  • Boalsburg, PA
50 Miles