Treeathlon 2020 Registration coming soon! stay tuned!

All registrations are final and non-refundable, no exceptions.
Registration fees cover costs of hosting the 2020 Treeathlon and support the Stanford University Triathlon Team.


draft-legal sprint

Registration for the draft-legal race is open to Collegiate and Elite athletes. We will also accept experienced Age Group athletes with permission. Experienced age groupers who would like to participate should contact the race director at to get a registration code.


Classic sprint

The Classic Treeathlon is a popular event, so we recommend that you register early. Registration will be capped at 650.