New Hampshire · Half Marathon
Seacoast Half Marathon
Seacoast Half Marathon is a half marathon event held in Portsmouth, New Hampshire. It was last held on October 25, 2026 and is usually run in October; the next date hasn't been announced yet. About 1,500 runners take part across all distances.
- Usually held
- October
- Location
- Portsmouth, NH
- Field size
- ~1,500 runners
Race details
- Last held
- October 25, 2026
- Usually held in
- October
- Location
- Portsmouth, New Hampshire
- Distances
- Half Marathon
- Field size
- About 1,500 runners
- Course
- Flat
- Registration
- runsignup.com
- Official website
- seacoasthalfmarathon.com
Registration, course & weather
- Registration status
- Registration status as last checked October 5, 2026: open
- Start time
- 8:00 AM EDT
- Course profile
- Loop course; Road surface; 381 ft gain (estimated from third-party elevation data); USATF certified
- Typical race-day weather
- about 49°F at the start, 66% humidity, 4 mph wind (based on the 2023 race day, measured near the city center rather than the exact start line; Open-Meteo, checked October 5, 2026)
About the Seacoast Half Marathon
A beloved coastal half marathon starting and finishing at Portsmouth High School and winding through Rye and New Castle, celebrating its 20th anniversary and benefiting a local charity each year.
Rankings and notes
- Rankings and awards
- Purely charitable race that has raised nearly $2 million for local nonprofits; USATF-certified
- Notes
- Popular coastal race
More half marathons in New Hampshire
Coming up next, by confirmed date.
-
CMC Manchester City Marathon, Half Marathon, Relay & 5KManchester, NHMarathonHalf MarathonMarathon Relay5K ~2,500 runners
-
Gate City Marathon, Half Marathon & RelayNashua, NHMarathonHalf MarathonMarathon Relay ~300 runners
More races in Portsmouth
More upcoming races in New Hampshire
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Guides from the RaceRove blog
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Seacoast Half Marathon: common questions
- When is the Seacoast Half Marathon?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the Seacoast Half Marathon held?
- In Portsmouth, New Hampshire.
- What distances does the Seacoast Half Marathon offer?
- Half Marathon.
- How many people run the Seacoast Half Marathon?
- About 1,500 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Seacoast Half Marathon?
- Registration is handled by the organiser at runsignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Seacoast Half Marathon?
- Registration status as last checked October 5, 2026: open. $99 (from seacoasthalfmarathon.com, checked October 5, 2026).
- What time does the Seacoast Half Marathon start?
- 8:00 AM EDT.
- What is the course like at the Seacoast Half Marathon?
- Loop course; Road surface; 381 ft gain (estimated from third-party elevation data); USATF certified.
- What is race-day weather usually like at the Seacoast Half Marathon?
- about 49°F at the start, 66% humidity, 4 mph wind (based on the 2023 race day, measured near the city center rather than the exact start line; Open-Meteo, checked October 5, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.