Showcasing Northern California's most scenic single track trails, this 50k is both challenging and beautiful. Winding through grassy meadows, towering pines, wildflower-covered hillsides, and fragrant sage, the race features several water-crossings and about 14 miles of banked mountain bike trails. The trails range in technical difficulty throughout the entire course. Besides having an incredible swag bag, the finish includes plenty of food and Lassen Ale Works beer.

Upcoming Races

May 8 2021
50 KM
Mixture Course
8 Aid Stations
9 :00 Cutoff
3 Elevation Rating
Hilly, ~2500-7500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts


50 KM View course top times

Date Finishers Top Result Top Result (F)
05/09/20 Race Cancelled
05/11/19 34 4:29:54 4:57:30
05/12/18 41 4:07:50 4:56:57
05/13/17 41 4:29:08 5:07:12
05/14/16 34 4:17:04 5:36:23
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

Tommyknocker 12-Hour & Mine Shaft Half

  • May 15, 2021
  • Golden, CO
12 Hours