Online registration for the 2021 Great Bay Half Marathon & 5K is closed and there will be no race day registration.

The 15th Annual Great Bay Half Marathon & 5k is returning on Sunday, March 26, 2023 for another delightful day of scenic New England running along the Great Bay estuary and historic downtown streets of idyllic Newmarket, NH! Half marathoners begin their race by traversing winding roads complete with captivating views (keep your eyes peeled for bald eagles and great blue herons), culminating with a downhill finish complete with beautifully restored buildings, centuries-old mills, and all the rich history the heart of Newmarket has to offer. Even better, all runners are rewarded with stylish swag, two complimentary beers (21+), and plenty of delicious and healthy snacks!

Register Now!


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What You Get

Unlike other races, your registration for The Great Bay Half Marathon & 5k will include a lot of awesome stuff! Stay tuned for more details!

Premium Tech Tee

5K runners will get a premium tech tee featuring an innovative polyester honeycomb-weave fabric that’s breathable and slightly stretchy, making them great for running or working out.


CRAFT BEER & Free Pizza

As if all that wasn't enough, runners 21+ get two delicious Smuttynose craft beers! Plus, all runners get free pizza after the race along with healthy Stonyfield yogurt, energizing granola bars and Hint flavored water!

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Ready To Run?

Click the button below to reserve your spot at The Great Bay Half Marathon & 5k!

Register Today!