• September 9, 2017​​
  • ​October 21, 2017
  • December 10, 2017
  • ​February 17, 2018
  • ​March 10,  2018

All Colorado trail running races are considered to be a part of our Summer Series, while our Southern California races are defined as our Winter, or "Sunshine Series".

All trail races in Colorado and California are produced and organized by the Endurance Race Series, LLC.

"The Endurance Race Series events are the best ones out there! The events are incredibly organized, family friendly, super fun, and the course are phenomenal" 


Jackie B.

What Runners Say About Us

ERS events facebook page
  • April 28, 2018
  • ​June 3, 2018
  • June 16, 2018
  • June 23, 2018
  • ​July 22, 2018
  • August 26, 2018
  • ​TBD
  • September 8, 2018
  • ​September 22, 2018
  • ​October 7, 2018

Welcome to the Endurance Race Series, home to 15 total trail races in Colorado and California. 

Whether you are a competitive trail racer, an avid runner, or a trail beginner, our races have what you are looking for...

Challenging, yet beginner friendly race courses, great mountain views, with a family friendly atmosphere, and fun post race celebration!!


"I bought the 10k Season Pass as a way to support my fitness goals. I am achieving that and along the way, with each race, i see friendly, supportive, joyful people who motivate me with their positive energy. This is a consistently, extraordinary experience that i am recommending to everyone i know. You ROCK Endurance Race Series" 


Michelle K.

Trail Races in Colorado and California