Founded in 1997 by a group of passionate baseball enthusiasts, the Greenbelt Blue Rocks started as a local league team striving to unite the community with the spirit of sportsmanship and camaraderie. The team’s name was inspired by the lush greenbelt surrounding the city and the resilient rock formations that symbolize the area's strength and endurance. Their motto became "Solid as Rock, Blue as the Sky," highlighting their connection to nature and the community.

The Blue Moose, their quirky mascot, joined the team’s legacy in 2005. Legend has it that the idea for the mascot emerged during a brainstorming session involving the team and fans. One young fan told a fantastical story about encountering a mystical blue moose while hiking in the greenbelt—this magical creature was said to represent teamwork, bravery, and unrelenting spirit. The tale captured everyone's imagination, and the Blue Moose became the heart and soul of the Greenbelt Blue Rocks.

Today, the Blue Moose, with its signature antics and boundless energy, cheers on the crowd during games and serves as a symbol of community pride. Whether swinging a pickax (a nod to the area's hardworking spirit) or leading the fans in chants, the mascot embodies the team's resilient nature and the joy of coming together to celebrate the beautiful game of baseball. The Blue Moose has even inspired "Moose Moments" during games, where fans share their proudest or funniest moments related to the team.