Colorado's Largest Trail Race Series

August 7, 2016

Endurance Race Series

Welcome to the Endurance Race Series, Colorado's Largest Trail Race Series...

The Endurance Race Series is the home of nine (9) different trail race events extending from the front range  to the mountains.  Whether a competitive trail racer, an avid runner, or a trail beginner, our trail races have what you are looking for...

Challenging, yet beginner friendly race courses, great mountain views, a family friendly atmosphere, and a post race celebration that will keep the part going all morning long!!

​The Endurance Race Series is proud to offer a half Marathon and 10k race optionat each of our nine (9) events, and a 5k option at four (4) of our events, which include:

  • Westminster
  • Beaver Creek
  • Snow Mtn Ranch
  • ​Louisville

June 5, 2016

July 31,  2016

March 27, 2016

July 17, 2016

Sept 24, 2016

Oct 9, 2016

Our News:


USAF Becomes Presenting Sponsor  
The ERS announced today that the US Air Force has agreed to become the Presenting Partner to the 4th Annual Louisville Trail Half Marathon, 10k, and 5k.



Denver Trail Race Details Announced
The ERS announced today that the longest running event on the series schedule has been moved back to Cherry Creek State Park, where the event began 6 years ago.


ERS Launches Mobile App 

Get all the ERS race information at your finger tips by downloading the FREE mobile app

May 21, 2016

Sept 10, 2016

Kid's Half Mile Dash

Running is not just for adults... get the kids involved! The Endurance Race Series also offers a Kids Half Mile Dash presented by the Western Dairy Association for kids 10 years and under.  Kids registration is $10 and available onsite, race day and includes a kids medal. ​

Our Events: