Seacoast Half Marathon
- Date
- October 25, 2026
- Distance
- Seacoast Half Marathon
From the Organizer
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!
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
56°
Typical Low
38°
Chance of Rain
35%
Based on US Climate Normals data from Greenland, 4 mi from the venue.
Host City
About Portsmouth, NH
Population
22,332
as of 2023
Elevation
23 ft
Nearest Airport
PSM
Portsmouth International Airport at Pease · 3 mi
Major Hub
PWM
Portland International Jetport · 46 mi
Time Zone
Eastern Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Seacoast Half Marathon, put it on the calendar, and turn “someday” into a start date.
139
Days to train
- Race
- Seacoast Half Marathon
- Date
- October 25, 2026
Coming Up
More Running races near Portsmouth, NH
Market Square Day 10K 2026
10K
Less than a mile away
LIVE Saunders at Rye Harbor 10K
10K
4 miles away
Seacoast Cancer 5K Run/Walk
5K
Less than a mile away
18th Annual Celebrate Pink 5K Run & Walk
5K
Less than a mile away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
The half marathon is the distance where you find out what you're actually made of. Long enough to demand real preparation. Short enough that it doesn't consume your life to train for it. Most people who run their first half describe it as the race that changed their relationship with what they're capable of. Once you cross this finish line, the bar moves. That's not a warning — that's the point.
Race day energy varies by event size, but the finish line feeling is the same regardless. Big races keep the noise going the whole way. Smaller races give you stretches where it's just you and the miles — and that solitude becomes its own kind of fuel.
The half marathon rewards people who show up for the boring training miles.
How long to train: 10–14 weeks. If you're already running consistently, 10 weeks of structured buildup is enough. If you're building from a casual base, give yourself 14.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Seacoast Half Marathon?
- Seacoast Half Marathon is a running race held in Portsmouth, New Hampshire on October 25, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Seacoast Half Marathon?
- Sunday, October 25, 2026 in Portsmouth, New Hampshire at Portsmouth High School, Portsmouth, NH. Check the event page for exact start times and wave schedules.
- How do I register for the Seacoast Half Marathon?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Seacoast Half Marathon
Oct 25, 2026