Be a Treeathlete!

All registrations are final, non-transferable, and non-refundable, with no exceptions.

Registration fees cover hosting Treeathlon 2025 and supporting the Stanford University Triathlon Team.

Don’t know if you should register for Classic or Draft Legal? Read our FAQ’s.

Classic Sprint Race

This is the classic triathlon format and our main event, perfect for newcomers and veteran triathletes: a 600m open-water swim, a 20km bike, and a 5k run. Participate as an individual racer for the ultimate challenge or in a relay team with friends to share the experience!

If you are currently enrolled in college, please register for the collegiate race. If you are not enrolled in college, please reigster for the age group race!

The Classic Sprint is extremely popular, so we recommend registering early. Registration will be capped.

This is a WCCTC and USAT-sanctioned race. Collegiate athletes representing WCCTC triathlon clubs should indicate their affiliation during registration.

All registrations are final and non-refundable, with no exceptions.

Draft Legal Race

The draft-legal race is open to Collegiate and Elite athletes, as well as Age Group athletes with strong cycling skills and triathlon experience.

To receive a code to register for DL, please email treeathlon@gmail.com with a short description of your triathlon background.

All registrations are final and non-refundable, with no exceptions.