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Come For The Race,

Stay For The after-party

The Columbia Threadneedle Investments Boston Triathlon captures the essence of the city – historical, scenic, fun and exciting. As a participant in the triathlon, you’ll swim in the fresh waters of Dorchester Bay, bike through Boston city streets, and run along the scenic Southie shoreline. Following the race, celebrate with friends and family at our huge post-race party!

Race for Boston!
Team up with our Official Race Charity Partner, Boston Medical Center! Race in support of BMC’s mission to create the healthiest city by 2030, which include substance use disorders as a key area of focus. Learn More

Register now for one of the biggest events of the summer and start training with friends. It will be a blast for athletes of all abilities, as well as volunteers, friends and family members!


In 2019, we are thrilled to announce that the Columbia Threadneedle Investments Boston Triathlon will once again join other major urban triathlons in the U.S. as an Olympic Distance Race! The start and finish will be at DCR Carson Beach and DCR Mother’s Rest Fields, and will take advantage of the closed roads and pathways along the South Boston shoreline.


The swim course starts and finishes on DCR Carson Beach near the DCR McCormack Bathhouse and follows a trapezoidal path to the finish line.


The flat loop course is on a number of wide, car-free roads, including DCR William Day Blvd. The entire bike course will be closed to vehicular traffic and managed by state troopers.


The run course highlights the best of Boston , with spectacular views of the harbor and the Boston Skyline. It is a loop course that finishes back at DCR Mother’s Rest Field.

Enjoy Our

Exclusive After-Party

Come celebrate with us in the beer garden for our post-race party! All racers, friends, family members, spectators and volunteers are welcome to enjoy food trucks and unlimited free beer. Our many other sponsors and vendors will also be activating in the beer garden providing fun activities and giveaways for all!

Participate As a relay

Love to run, but hate to bike and swim? Grab two friends and sign up as a 3-Person Relay Team! For those who are up for a bigger challenge, we also offer an option for 2-Person Relay Teams. Bring old friends and make some new ones at this summer’s triathlon!

Participate as an Individual

We’re excited to announce that the 2019 Columbia Threadneedle Investments Boston Triathlon will once again offer an Olympic Distance race! If you live outside of Boston, this is a perfect reason to visit. If you’re a local – Why travel elsewhere, when you can race in your backyard?

Participate as a Team

Encourage your friends, family or colleagues to join the fun by signing up as a team! The Annual Team Challenge is a great way to experience the Sprint race from start to finish while participating in some friendly competition. Teams of 5 or more will be competing for bragging rights as the fastest club team in Boston!

Participate as a Fundraiser

Want to make a difference in your community as you swim, bike and run? Race for free, and raise critical funds for our Official Race Charity Partner Boston Medical Center. Team perks include Team BMC gear, complimentary training program, personalized fundraising page and more!