Great Bay 5K | Race for a Healthy Estuary
About this race
REGISTRATION IS NOW OPEN!!
Race Date: October 24, 2026
The Great Bay 5K is excited to hold its 28th annual race in 2026! The GB5K is the final race in the popular Seacoast Road Race Series and supports the non-profit Great Bay Stewards. The course passes the shores of Great Bay, and is a fun, fast, scenic, and mostly downhill event. In 2026, we are pleased to bring back the Great Bay 55K Challenge - run the entire 55 kilometers in one day, or complete the total distance anytime between October 1 - 24.
Wheelchair racers are welcome and will start at 8:45 a.m., prior to the 9:00 a.m. runner/walker start. No motorized wheelchairs are permitted, and wheelchair racers are responsible for maintaining their own equipment.
Participants in the 5K events will receive a long-sleeve race shirt, and everyone will get a bib with tear strips that you can take to select establishments for free beer or cider. Please keep in mind that you must register by October 1 to get a race shirt. People who register after that may claim a shirt if any remain on race day.
All proceeds from the Great Bay 5K go to the non-profit Great Bay Stewards, which supports conservation, education, community outreach, stewardship, and research of the Great Bay Estuary.
Pick your distance
Running
Great Bay 55K
With this virtual race registration, you'll receive a long-sleeve race shirt (must register by 10/1/26) and a race bib with one coupon for a free beer or cider.
Great Bay 5K
With this in-person race registration, you'll receive a long-sleeve race shirt (must register by 10/1/26) and a race bib with one coupon for a free beer or cider.
Typical race-day weather
Based on 6 years of Open-Meteo archive data for this event's race dates in Stratham, plus the 3 days either side.
The sun rises at 6:40 AM and sets at 6:27 PM local time (EDT) in Stratham on September 30, 2026 — 11h 46m 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.
Reviews
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Results — Great Bay 5K | Race for a Healthy Estuary
Other races near Stratham
Different organizers, within 40 miles, in the next three months
Dan Healy Memorial 5K
Kensington Pink Race
Hampton Falls Tiger Trot
Seacoast Half Marathon
🏃 Plan Your Next Race in Stratham
Find upcoming events by distance:
- Stratham 5K Races 2 races
- Stratham Running Calendar 2026 3 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, 3 Stratham events
Spotted something wrong? Tell us and we'll fix it.