The GB5K | Race for a Healthy Estuary welcomes runners in costume and offers multiple awards for best dressed runners, including awards for best female and male costumes, best costumed family and and best team costumes! There are even costume awards for the Kids Fun Run!

The Great Bay 5K | Race for a Healthy Estuary features a very fast course including the unique MacKenzie Mile.

Rachel Schilkowsy breaks the course record (16:32) at the 2019 race.

The Great Bay 5K | Race for a Healthy Estuary features a very fast course including the unique MacKenzie Mile.

Adam Martin breaks the course record (14:34) at the 2019 race.

The mostly downhill course is easily accessible for racers in wheelchairs or for those who would like to push wheelchairs. The entire campus of the Great Bay National Estuarine Research Reserve is handicap accessible. 

The race is part of the Seacoast Road Race Series. The Great Bay 5K | Race for a Healthy Estuary is the last of the Seacoast Road Race series. Runners completing 5 of the 7 races in the series earn a high quality running jacket for their accomplishment. And all of the races in the series benefit one or more charitable organizations from southern Maine to northern Massachusetts.

Our efforts go toward supporting the Great Bay Estuary System in Southern New Hampshire and Maine.