Welcome to the home of 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 need...
Challenging yet beginner friendly race courses, great mountain views, a family friendly atmosphere, and post race event festivals that keep the party going all morning long!!  

The Endurance Race Series is proud to offer a Half Marathon and 10K race option at each of our ten (10) events, and a 5K Option at four (4) of our events, which include:

  • Westminster
  • Beaver Creek
  • Snow Mountain Ranch
  • Louisville


Running's 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 and under as well.


Get the ERS Mobile App now on both Android and iPhone... just search Endurance Race Series