Seacoast Half Marathon

The Seacoast Half Marathon is a 13.1-mile race held in Portsmouth, New Hampshire, starting and finishing at Portsmouth High School. The course winds through the historic coastal communities of Rye and New Castle, offering scenic views of New Hampshire’s Seacoast. In its 20th year, the event emphasizes local charity, with 100% of net proceeds supporting a Seacoast-area nonprofit (Birchtree Center in 2025).

The race features a long-sleeve shirt and medal for all participants, prize money for top finishers, and special team prizes; it bills itself as the area’s purely local, purely charitable race, a celebrated local tradition for runners of all levels. Visit the organization's website for the most recent information.