The Great Frederick Fair is Frederick County's single Largest Event held annual the third week in September. The fair is over 150 years old and attracts over 200,000 visitors. The nine day event includes, livestock shows, 4-H/FFA exhibits, amusements, headline entertainment, tractor pulls, and a demolition derby.
In addition to the annual fair the fair is home to the only year-round farmers' market in the county. The market is over every Saturday from 8 a.m. - 2 p.m.