Seacoast Half Marathon

The Seacoast Half Marathon is an annual scenic race held in Portsmouth, New Hampshire, celebrating its 20th anniversary in 2025. The half marathon course starts and finishes at Portsmouth High School and winds through the historic coastal communities of Rye and New Castle, offering runners stunning views of New Hampshire’s Seacoast. This event is unique as a purely local and charitable race, with 100% of net proceeds benefiting a Seacoast-area nonprofit.

Participants receive a long-sleeve race shirt and medal. The 2025 beneficiary is the Birchtree Center, supporting individuals with behavioral challenges and related disabilities. The race fosters community spirit and supports local causes. Visit the organization's website for the most recent information.