ERS events facebook page

New in 2018:

  • ​Bib Tagged Timing Only, no Chips
  • ​No Shirt, Registration Options ($5 off)
  • ​Tri-Blend Race Shirts. No Tech tees
  • ​New 10K course for Coast to Crest event
  • ​New Courses for @ least 2 CO events

2018 San Diego "Sunshine Series" Promo Video

Colorado Trail Race Schedule

Colorado Races Only


"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.

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!!

All ERS Races Meet ATRA Event Standards

2018 Colorado "Summer Series" Promo Video

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".

"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

San Diego Trail Race Schedule