Enrich your life by supporting the Great Bay 5K | Race for a Healthy Estuary!

The Great Bay 5K | Race for a Healthy Estuary will take place virtually for 2020, being held from October 1 – 24, 2020. New this year, the Great Bay 55K Challenge! This unique race, which you can walk, run, use a wheelchair or treadmill to complete, allows the participant to complete a 55K from October 1 – 30, 2021. 

The races are a fundraiser for the non-profit Great Bay Stewards and the Great Bay National Estuarine Reserve, located in Greenland, NH. We offer many ways to assist with the mission of supporting the Great Bay in addition to supporting New England’s famous 5K!


Become a Sponsor of the Great Bay 5K and Great Bay 55K Challenge

We are accepting sponsors for the Great Bay 5K and the Great Bay 55K Challenge. Sponsorship packages start at just $100, and depending on the level a sponsor chooses, the company will receive visibility on the race website, and in press releases, social media, and/or other digital and printed media. You may also have your company banner hanging at the on-site pavilion. Please contact info@greatbaystewards.org to find out more. 

Volunteer at the Great Bay 5K and Great Bay 55K Challenge

Whether it’s a smile to a tiring runner or an offer of a welcome beverage a the end of the race, volunteers are valued members of the Great Bay 5K team. For more details, visit the Volunteer page.

Become a Great Bay Stewards Member

Long after the Great Bay 5K race ends, the work of protecting and preserving the Great Bay continues. When you join the Great Bay Stewards, your membership makes you part of the team that works to preserve, protect, and provide education about the Great Bay, as well as help to fund a wide range of activities, and help residents and visitors learn more about this unique environment.


  • We keep you informed about new activities and programs that support the Bay.
  • Receive advance notice of special events.
  • 10% member discounts at the Great Bay Discovery Center Store.
  • Discounts on children’s programs and summer kayak trips.
Click HERE to learn more about membership or to make a one time or recurring donation.
Great Bay National Estuarine Research Reserve




Great Bay National Estuarine Research Reserve