Sea to Summit Triathlon Cumberland Center, ME   Jul 25, 2026

The Sea to Summit is not your traditional multisport race. This is an amazing day which combines the core elements of triathlon with the challenges of an adventure race. With assistance from your support designate, or porter, you’ll swim 1.2 miles, ride 95 miles then run and climb your way a strenuous five miles up the tallest mountain in the Northeastern United States. Serious athletes only need apply.

How unique is Sea to Summit? At dawn, competitors are swimming at sea level. Seven to 12 hours later they are standing at the highest point in the Northeastern United States.

This is a deliberately small race, with a limited field of 125 experienced triathletes. Each competitor must designate a support person, or porter, who will be present at the start, drive the course (although not alongside the athlete), take away the bike at T2, and chauffeur the athlete down the mountain. For relay teams: as the race progresses one of the non-active team members assumes the role of porter.