FC Frederick's Middle School League (MSL) is a summer 7-a-side league designed to tap into players' interest in school-based sports participation, while utilizing, as much as possible, the expertise and dedication of the FC Frederick coaching staff and community. Players are encouraged to register online for the league in early May. Tryouts, based on FCPS Middle School draw areas, are typically completed in late May, with player selections posted by early June.
Teams play 2 games per week, one weekday and one Sunday, beginning the last week in June through the last week in July for an 8 game season. There are teams for Varsity (current 7th and 8th graders) and Junior Varsity (current 5th and 6th graders). Varsity level teams will play for the MSL Championship at the end of each season.