Stanford Treeathlon
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Event overview
The Stanford Treeathlon on February 14, 2026 is a collegiate triathlon hosted by the Stanford University Triathlon Team in San Mateo, California. The race format is an open-water swim, a bike leg, and a run leg. Distances for the classic course are:
- 750 m swim
- 20 km bike
- 5 km run
There are two separate races on the same day: a draft-legal triathlon for collegiate and elite athletes, and a classic non-draft-legal Treeathlon. Registration for the draft-legal race uses a separate link.
Categories, eligibility, and registration
Event categories listed for 2026 include Collegiate Athlete, Age Group Athlete, Paratriathlete, Male Team Relay, Female Team Relay, and Mixed Relay. Age eligibility shown in the event details:
- Collegiate Athlete: open to ages 17 and up
- Age Group and Paratriathlete events: open to ages 16 to 100 Overall race rules state participants must be 16 years old on race day.
Registration opens December 1, 2025. Published entry fees for listed events include the Collegiate Athlete and Age Group/Paratriathlete prices, and a higher fee for team relays.
Location and waves
The event take place at 1901 J Hart Clinton Dr., San Mateo, CA 94401. Each race uses separate men's and women's wave categories; the organizer states they will accommodate participants regardless of gender identity. Visit the organization's website for the most recent information.
