2 triathlon events in San Mateo, California

Register here for the DRAFT LEGAL race! Classic race registration can be found here. To request a code to sign up for draft legal, please email treeathlon@gmail.com. If you're wondering if you should race draft legal or classic, please check the FAQs on the race website.

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 Draft-Legal Race and the Classic Race. The Stanford Draft Legal Triathlon for advanced Collegiate and Elite athletes will start at 08:30 am. The Classic Stanford Treeathlon, a open non-draft legal race for collegiate athletes, age group athletes, and relay teams, will start at 11:00 am. 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.

This is the registration for the Draft-Legal Race. Registration for the Classic Race is a separate registration link. Please check the race website for the Classic Registration link and additional details around the event.

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.

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 Classic Race and the Draft-Legal Race. The Classic Stanford Treeathlon, a open non-draft legal race for collegiate athletes, age group athletes, and relay teams, will start at 11:00 am. The Stanford Draft Legal Triathlon for advanced Collegiate and Elite athletes will start at 08:30 am. 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.

This is the registration for the Classic Race. Registration for the Draft Legal event is a separate registration link. Please check the race website for the Draft-Legal Registration link and additional details around the event.

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.