ERS events facebook page

New in 2018:

  • ​Bib Tagged Timing Only, no Chips
  • ​Race Shirt Optional Registration
  • ​Next Level Cotton/Poly. No Tech tees
  • ​Trail Running Festival @ Snow Mtn Ranch (including new 50K option)
  • ​New Courses (CO) for the Westminster, Eagle, Mountain Ridge, Beaver Creek, and Snow Mountain Ranch events
  • ​New Course (SD) for Black Mountain event

2018 San Diego "Sunshine Series" Promo Video

ERS Partner Race

The ERS is offering a race weekend package, save up to 50% off your registration when you register for both the Denver and Barefoot Lakes trail races.  (Sign up for both events and automatically receive 30% off, then use a disoucnt code for additonal 20% off)

"Summer Series" Schedule

I have been racing for 30 plus years, and know the making of a good and enjoyable race for all - whatever kind it might be. The ERS is well organized, and puts on a good race, have beautiful surroundings, well positioned aid stations, photo opps, food, and announcing.


Pam G.


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

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, spectacular views, with a family friendly atmosphere, and fun post race celebration!!

​Oh... and FREE race photos!

All ERS Races Meet ATRA Event Standards

2018 Colorado "Summer Series" Promo Video

What Runners Say About Us

"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.

"Sunshine Series" Schedule