Stanford Treeathlon 2026

--- Race registration is temporarily closed while a few details are finalized. If you've already registered, your details have been successfully recorded and we will be in touch within the next few weeks! We appreciate your patience, please contact treeathlon@gmail.com with any questions or concerns. ---

Come and join in the fun of one of the best collegiate triathlons in Northern California! The race is a 750m open-water swim, a 20km bike, and a 5k run. 

There are two separate races taking place on February 14th, 2026. The Stanford Draft Legal Triathlon for Collegiate and Elite athletes will start at 10:00am. The Classic Stanford Treeathlon, a non-draft legal race, will start at 1:00 pm. In each race, we have two categories of waves, men's and women's. While these wave start categories are binary, we recognize that not all people fit within that and we will accommodate all participants regardless of gender identity.

Registration for the Draft Legal event is a separate registration link. Please check the race website for updates.

You must be 16 years old on race day to participate in this race.

Please be sure to check the race website for packet pickup information and schedule changes. Answers to frequently asked questions (water temps, equipment, etc.) can be found here: http://www.stanfordtreeathlon.com/faqs.