Seacoast Half Marathon

Sunday, October 31, 2021 • Portsmouth, NH • Course Map

Note: A virtual option is available for the 2021 event, to be run anytime from October 23 to October 31. Registration details are included below.

Run, walk, or jog through the saltwater marshes, woodlands, and rugged coastline of New Hampshire’s Portsmouth Harbor at the Seacoast Half Marathon, which raises money to benefit Cornerstone VNA, a local healthcare organization on the frontlines of COVID-19.

Largely fast and flat, the Seacoast race offers participants a scenic tour of Portsmouth as well as the nearby towns of Rye, New Castle and the harbor. Just under 1,200 runners and walkers crossed the finish line at the race’s 2016 running.

The loop course takes place entirely along paved city and town roads, and starts and finishes at the Portsmouth High School grounds.

Plentiful gentle, rolling hills are found along the course but none would be considered challenging, as the course offers a total elevation change of about 61 feet, dropping to about sea level at several points throughout the race.

Runners (who start at 8:30 AM) and walkers (8:00 AM) are cautioned to remain on the lookout for traffic throughout the race, as the course will remain open to auto traffic (though volunteers will be placed throughout the course to direct traffic away from race participants).

Here’s a note from the organizer on the race’s beneficiary:

“The Seacoast Family Food Pantry (SFFP) is one of the oldest social service agencies in New Hampshire, started in 1816 by a small group of women whose goal was to feed the families of fishermen in Portsmouth, NH.

“Today, the SFFP strives to fulfill the needs of low-income individuals and families with food, personal care products and education for healthy living. These services are provided on both an emergency and on-going basis, with respect for the dignity of each individual.

SHM band
SHM fans

All photos courtesy Seacoast Half Marathon

Race Weather & Climate

Nestled along the coast of southeastern New Hampshire, just over 40 miles east of Manchester, Portsmouth typically sees cool weather in October with some cold mornings, when the city’s average monthly temperatures range between 40°F and 65°F.

On race day (Oct. 31), the average low is 33ºF and the average high is 51ºF.

Past Results

Course Map

See the race route map for the Seacoast Half Marathon here.

Starting Time

  • 8:00 AM – walkers
  • 8:30 AM – runners


  • $65 – $70 for the in-person half marathon
  • $35 and up for the virtual races


To reserve your spot in the 2021 running of the Seacoast Half Marathon, register online at here.

Official Race Website


Ever run in the Seacoast Half Marathon? Share your impressions here, or post your review in the Comments below.

See more races in: October, New Hampshire

1 comment… add one
  • Paul Murphy October 24, 2017, 9:41 am

    Any chance for an entry to the Seacoast Half marathon?


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