Stanford Treeathlon 2025

Treeathlon Collegiate Athlete

If you are a team athlete affiliated with USA Triathlon WCCTC, please enter your team name when you register. If you are not affiliated please select "other" or "open" when you register.

Open to ages 17+.

Start Time:: 7:00am PST
End Time:: 3:00pm PST

Registration Limit:: 41 spots left.
Registration:: Online Registration is Closed

Treeathlon Age Group Athlete

You must be 16 years old or older by USAT age determination to register for this event.

Open to ages 16 - 100.

Start Time:: 11:00am PST
End Time:: 2:00pm PST

Registration:: Online Registration is Closed

Treeathlon Paratriathlete

Open to ages 16 - 100.

Start Time:: 11:00am PST
End Time:: 2:00pm PST

Registration Limit:: 1 spot left.
Registration:: Online Registration is Closed

Treeathlon Male Team Relay

Relay for 3 male participants in the Classic race (one swimmer, one cyclist, one runner)

Open to ages 16 - 100.

Start Time:: 11:00am PST
End Time:: 2:00pm PST

Registration Limit:: 9 spots left.
Registration:: Online Registration is Closed

Treeathlon Female Team Relay

Relay for 3 female participants in the Classic race (one swimmer, one cyclist, one runner)

Open to ages 16 - 100.

Start Time:: 11:00am PST
End Time:: 2:00pm PST

Registration Limit:: 4 spots left.
Registration:: Online Registration is Closed

Treeathlon Mixed Relay

Relay for 3 participants of any gender in the Classic race (one swimmer, one cyclist, one runner)

Open to ages 16 - 100.

Start Time:: 11:00am PST
End Time:: 2:00pm PST

Registration Limit:: 15 spots left.
Registration:: Online Registration is Closed