Roncalli has a rich basketball tradition that has had teams go to the WIAA state tournament 8 times since the 2004-2005 basketball season. Most years Roncalli will find itself ranked in the top 10 teams in the state for their respective division. The Roncalli boys basketball team consists of 3 levels of teams (JV2, JV and varsity) and competes in the Eastern Wisconsin Conference.
The Roncalli boys basketball experience starts for boys when they are in 3rd grade where they learn the fundamentals of the game and begin to learn the basic concepts of Roncalli's offensive and defensive systems. The majority of the youth teams consist of players that go to Roncalli Elementary or Middle School, however Coach Garceau and the coaching staff welcome anyone who has an interest in playing the sport. The Junior Jets teams start playing in 3rd grade and play through 8th grade where the players then have the opportunity to play at the high school level if they choose to play.