20th anniversary

Join us for the 20th annual Seacoast Half Marathon on Sunday, Oct. 26, 2025! This scenic race takes you through the historic coastal communities of Portsmouth, Rye, and New Castle, offering stunning views of New Hampshire’s Seacoast. In a crowded race calendar full of corporate/for-profit races, the Seacoast Half is the only purely local, purely charitable race of its kind.

Register now!

Beat the Sept. 12 deadline to guarantee your shirt size! Online registration ends at midnight on Thursday, Oct. 23. On-site registration will be available during packet pickup at Marathon Sports in Portsmouth on the day before the race from 10 am to 4 pm, and on race day at Portsmouth High School from 7 to 8 am: $109 (includes fees).

2025 Beneficiary

The Birchtree Center builds full and productive lives for individuals with behavior challenges, autism, and/or related disabilities.

Join the team

We’re looking for volunteers to help out with a variety of on- and off-course roles, and we truly appreciate everyone who pitches in. There are plenty of options with different start times and lengths, so you can pick what works best for your schedule!

Prizes!

Cash prizes for top 3 male and female finishers: $250, $150, and $100. Break the course record and pick-up another $250! HOKA will be providing prizes for the 1st place finisher in each age group. And we are bringing back the OTTO Pizza Party with a $250 gift card for the FASTEST and LARGEST teams!

Questions?