Seacoast Half Marathon
About this race
The Seacoast Half Marathon is one of the longest-running half marathons in coastal New Hampshire. Join us for our 20th annual race on Sunday, October 26. This year's beneficiary is an amazing nonprofit dedicated to improving lives in the Greater Seacoast. So pick up your running shoes, gather your friends, and register for the feel-good race of the year. And consider going the extra mile for your neighbors in need by making a donation when you register. You can also set up your own fundraising page and get family and friends to help with your fundraising efforts. You can even use your donation/fundraising to earn free registration in the 2025 Seacoast Half Marathon!
Pick your distance
Running
Seacoast Half Marathon
The Seacoast Half Marathon will start and finish at Portsmouth High School, and travel through the beautiful coastal communities of Rye and New Castle, New Hampshire. You'll get a long-sleeve race shirt, and a half marathon finisher's medal. (Race shirt guaranteed for the first 800 registrants. Shirts may vary depending on availability.)
Typical race-day weather
Based on 20 years of Open-Meteo archive data for this event's race dates in Portsmouth, plus the 3 days either side.
The sun rises at 7:09 AM and sets at 5:45 PM local time (EDT) in Portsmouth on October 25, 2026 — 10h 35m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
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Results — Seacoast Half Marathon
Other races near Portsmouth
Different organizers, within 40 miles, in the next three months
Great Island 5K
2nd Annual New England Ostomy 5k
Dan Healy Memorial 5K
Hampton Falls Tiger Trot
🏃 Plan Your Next Race in Portsmouth
Find upcoming events by distance:
- Portsmouth 5K Races 3 races
- Portsmouth Running Calendar 2026 6 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 6 Portsmouth events
Spotted something wrong? Tell us and we'll fix it.