Welcome to the Endurance Race Series!

Weather you are a competitive trail racer, an avid runner, or a trail beginner, the ERS has what you are looking for... Challenging, yet beginner friendly race courses, spectacular views, family friendly atmosphere, and a fun post race celebration.

Oh... and free race photos for all runners to enjoy after each race.

 Registration Includes:

  • Professional Chip Timing

  • Finishers Medals

  • Overall Winner Prizes

  • Age Group Prizes

  • Free Race Photos

  • Finish Line BBQ

  • Free Beer (when allowed)


  • Barr Lake Half Marathon and 15K
    Barr Lake Half Marathon and 15K
    Adams County
    May 23, 7:00 AM
    Adams County, Barr Lake, Colorado, USA
    Join the Endurance Race Series as we head to Barr Lake State Park in Brighton, CO for some beautiful lake views and new PR's. The course is our flattest and fastest on the ERS schedule with less than 100' of elevation gain for either course
  • Mountain Ridge Half Marathon and 10K
    Mountain Ridge Half Marathon and 10K
    Highlands Ranch
    Jun 19, 7:00 AM
    Highlands Ranch, 10590 Mountain Vista Ridge, Highlands Ranch, CO 80126, USA
    The rolling hills of this Highlands Ranch course will keep the Heart Rate pumping while offering some of the best views in the front range.
  • Black Hawk Half Marathon and 10K
    Black Hawk Half Marathon and 10K
    Jul 18, 7:00 AM
    Golden, 92 Crawford Gulch Rd, Golden, CO 80403, USA
    If you are looking for one of the best "hill" courses the ERS has to offer, than look no further! You can bet this course will keep your HR high, while you take in the surrounding mountain views and terrain.
  • Louisville Half Marathon, 10k, 5k
    Louisville Half Marathon, 10k, 5k
    Louisville Community Park
    Aug 28, 7:00 AM
    Louisville Community Park , 955 Bella Vista Dr, Louisville, CO 80027, USA
    The course is a mostly flat with a beautiful, yet challenging hill that creates an epic vista point of the front range mountains as you hit the last mile of the course.
  • Snow Mountain Ranch Trail Festival
    Snow Mountain Ranch Trail Festival
    Sep 18, 7:00 AM – Sep 19, 11:00 AM
    Granby, 1101 Co Rd 53, Granby, CO 80446, USA
    Regardless of distance... these courses keep all runners surrounded by the changing colors, rolling hills, and picturesque views, making this location and courses still the "Most Beautiful ERS Course".
  • Carmel Valley Trail Race
    Carmel Valley Trail Race
    Torrey Highlands Park
    Oct 16, 7:00 AM
    Torrey Highlands Park, Corner of, Lansdale Drive, and, Del Mar Heights Rd, San Diego, CA 92130, USA
    Participants at the 7th annual Carmel Valley trail race, regardless of distance, will experience one of the hillier courses you will find without heading to the mountains. Elevation gains are only between 300'-700" depending on the course, and some of the hills you may encounter are short, but STEEP



What We Know about 2021



  • All LIVEraces in 2021 will be planned for a staggered start in each race category

  • Most race distances in CO will be limited to 175 runners 

  • All race waves will be set for 25 runners/ wave, with planned increases based on guidelines

  • Race waves will be separated by 5 min

  • We plan to offer a pre-packaged food bag at the conclusion of the event. Runners will have the option to take one of these bags. All items included will be prepackaged. (Colorado only)  

  • Medals will be individually wrapped when applicable

  • Hosting an event ceremony will be based on the local guidelines for each event.




Trail Running is not just for adults...


The ERS is excited to offer our very popular "Kids Dash". These races are geared toward those kids 10 years and younger, and will measure between 1/4-1/2 mile in distance based on the kids participating. 

2019-2020 San Diego Races... All proceeds raised will benefit Girls on the Run San Diego



In an attempt to minimize our footprint the ERS will begin 100% CUPLESS Racing  at the start of the Summer Series 2020.

What is CUPLESS Racing?  The ERS will provide the aid stations on course with electrolyte and water, while runners will need to provide a hydration vest, bottle, or reusable cup to use at the aid stations. Runners are allowed to fill up as much as needed




If you are a local (or national) company looking to be a part of a fun, family friendly Finish Line Festival at some of the best trail races in Colorado and San Diego, then the ERS has a spot for you. 

If you are interested in becoming a Sponsor to the ERS, please email us HERE, so we can get you some more info. If you are interested in becoming a vender at one of our events then follow the link below to sign up.



The ERS is proud to offer additional race and event consulting and marketing services to help other organizations make their race visions a reality.   


Service include but not limited too; Race Management, Sponsorship Sales, Race Announcer, Marketing and graphic design


"The ERS staff goes out of their way to give you the best trail race experience ever"

- Mandi R. 

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