Costumes

The GB5K welcomes runners in costume and offers multiple awards for best dressed runners!

Wicked Fast

The Great Bay 5K features a very fast course including the unique MacKenzie Mile.

Treats

More than just a race – the GB5K is a fun event for folks of all ages – runners and non runners alike.

Qualifier

The race is part of the Seacoast Road Race Series put on by Pro Portsmouth.

Kids Fun Run!

We love kids!

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