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Calvert Marine Museum Otters
Explore Calvert County, Maryland

175 Main St.
Prince Frederick, MD 20678
Ph: 410-535-4583
Fx: 410-535-4585

Discover amazing adventures and unspoiled beauty in Southern Maryland’s Calvert County. With abundant waterways and natural parks, unique shops and museums, excellent restaurants and a calendar filled with interesting events and activities, Calvert County is truly the “Charm of the Chesapeake."

What's New? - View All
37th Annual Patuxent River Appreciation Days is Oct. 11
Celebrate the Patuxent River at Southern Maryland’s longest running festival Saturday, Oct. 11 and Sunday, Oct. 12 at the Calvert Marine Museum. Everyone is invited for free family fun each day from 10 a.m. to 5 p.m. Learn more here.
Fourth Annual Bay Harvestfest is Oct. 4
Celebrate the season at North Beach with craft and food vendors, children's activities, live music, crabs, shrimp and beer. View full details here.