Run the Trails with the Endurance Race Series. 

The Endurance Race Series is home to 12 different trail race events in Colorado and California. 

"The Summer Series"- Colorado (April-Sept)

"The Sunshine Series"- San Diego (Oct- Mar)

Whether you are looking for a stroll along the water, some scenic single track, or a challenging hill course, the ERS prides itself in offering trail runners the BEST race experience and atmosphere in the industry. 

Every event within the ERS, offers multiple race distances, great course support, kid's races, and finish line festivals that the entire family can enjoy with music, food, games, raffles, and plenty of beer (for those over 21 years, of course).

COVID UPDATE:  The following San Diego County race have been moved to a virtual race only option:


DIXON LAKE (MARCH 13) registration please click HERE

What we know moving into 2021 with the races:

  • All live ERS races in 2021 will be planned as a staggered start for each race category
  • Race waves will be set at 25 runners/ wave with a planned increase based on permit guidelines
  • Race Waves will be separated by 5 min
  • We plan to offer a pre-packaged food bag at the conclusion of the event. Which runners will have the option to take for free. All items within these bags will be pre- packaged snack items.
  • Medals will be individually wrapped (when applicable) 
  • Hosting an awards ceremony in the finish line area will be based on current local guidelines at each event


DIXON LAKE (MARCH 13) registration please click HERE


If you would like to sign up for a 50K TEAM entry at the SMR Trail Festival you must register directly though the SMR registration page at...

PLEASE: Select which wave you would like to be entered into for your respectful race distance If selecting more than 1 event in the same distance the same wave will be applied to multiple races.  All our Half Marathon will begin at 7AM, while our 10K and 5Ks have been moved to an 830am and 9am start times respectively to help us maximize our race numbers on event morning. 

Please note that Wave Times apply ONLY to Colorado events at this time. 


LIABILITY WAIVER AND RACE AGREEMENT: I know that running or walking a road race is a potentially hazardous activity. I will not enter and run unless I am medically able to do so and properly trained. I assume all risks associated with running or walking this event, including but not limited to the effects of weather, traffic, course conditions. I understand that The Endurance Race Series, the sponsors, the volunteers, and all others assisting in the operations of the event and its supporting and related activities assume no responsibility or liability with respect to my participation in the run or in any related events. Having read this waiver, and knowing these facts, and in consideration of the acceptance of my entry, I for myself and any person entitled to act on my behalf do hereby release the Endurance Race Series, all sponsors, volunteers, together with their employees, contractors, subcontractors, even though liability may arise from negligence or carelessness on the part of persons or organizations named in this waiver and release.
*Prior to attending any event each runner must self-screen and stay at home if sick or exhibiting symptoms of Covid-19, or if they or someone they live with have been diagnosed with Covid-19

*Maintain physical distancing of at least 6ft whenever possible

*All Runners must wear a facemask or face covering before the run in the start area and after the run if socializing in finish areas. Face masks will not be required while on the course.

Please run at your own risk! Each participant acknowledges that Covid-19 is a global pandemic and that infections have been confirmed throughout the US. Each participant understands that the Endurance Race Series cannot guarantee safety or immunity from infection. Each participant understands the uncertainty of the virus, how it may impact their health, and voluntarily assumes all risks associated directly or indirectly with participating in any Endurance Race Series activity. Each participant knowingly and voluntarily waives and releases Endurance Race Series, its staff, volunteers, and sponsors from any and all future claims of any type, including for any harm or loss, personal injury, disease or death. Each participant agrees not to sue Endurance Race Series for any personal injury, death, medical expenses, disability, court costs, attorney fees, and/or other loss

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