Seacoast Half Marathon
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Event details
The Seacoast Half Marathon is scheduled for October 26, 2025, in Portsmouth, New Hampshire. The race is the 20th annual running of this half marathon and starts and finishes at Portsmouth High School. The course passes through the historic coastal communities of Portsmouth, Rye, and New Castle. Every participant receives a long-sleeve race shirt and a finisher medal. The event donates 100% of net proceeds to a local nonprofit.
Charity, registration and prizes
The 2025 beneficiary is the Birchtree Center, which supports individuals with behavior challenges, autism, and related disabilities. Online registration has a stated closing date of October 23; on-site packet pickup is offered the day before at Marathon Sports in Portsmouth and on race day at Portsmouth High School. Volunteer opportunities are available for a range of on- and off-course roles with different start times and lengths. Cash prizes are listed for the top three male and female finishers: $250, $150, and $100. An additional $250 is offered for breaking the course record. HOKA is providing prizes for first-place age-group finishers, and an OTTO Pizza Party award includes a $250 gift card for the fastest and largest teams. Visit the organization's website for the most recent information.