Thank you for choosing to participate in the Endurance Race Series.  We know there are many events out there to choose from, so your participation is much appreciated. 

Aside from individual race registration to each of our races, we also offer a Season Pass (VIP Package), and a Pick 6 option. For more information on either of these additional options please click on the link below.


​For individual race registration click on the race logo. 



Happy Trail Running!!




PLEASE NOTE: 


We do offer a Shirt and "No Shirt" registration option when registering for any of our events

ALL pre-registered runners will receive a gender specific T-shirt upon packet pickup. When registering for your event online you will have the opportunity to select the correct shirt size. (If you choose the shirt option)

Important- Only those people that PRE-register for an event and select the shirt option will be guaranteed to receive a T-Shirt with their registration, while ALL packet pickup and race day registrations will be asked to wait until they have finished the designated event to pick up their race shirt. Please note, that race day registrants will not be guaranteed the correct size shirt if any at all. Thank you for understanding this policy, as we want to make sure those runners that register early do receive the shirt they requested.  
 We order our shirts about 10 days out from the respective event, so it is our recommendation that you complete online registration no later than that time frame to be guaranteed a shirt of your choosing.

ALL FINISHERS, regardless of distance will receive a medal.


If you register for a specific race distance and need to upgrade or downgrade, you may do so by contacting our staff before the registered event. 

  • $30 Upgrade Fee is required for 10k to Half
  • $15 Upgrade fee is required for 5k to 10k
  • No refunds will be given for downgrading


Season Pass holders that finish all 10 races will receive a special "SEASON PASS AWARD" and "SEASON PASS MEDAL" at the conclusion of the series.

Denver Trail Race
Louisville Trail Race
Del Dios Trail Race
Snow Mountain Ranch Trail Race
Carmel Valley Trail Race
Black Mountain Trail Race

Registration Information

California Races

Colorado Races

ERS events facebook page