Mountainside Junior Baseball Organization (JBO) is a 501(c)(3) non-profit organization that was established in 2017. The program is directly aligned with Mountainside High School and works closely with Ryan Fobert, the Head Varsity baseball coach and his coaching staff in helping to provide the skills and competition needed to develop the participating players.

The goal of Mountainside JBO is to build a team of players who reside in the Mountainside High School boundaries to compete against other players of equal age and skill and help them to achieve their full baseball potential. The JBO program is in a unique position to prepare your child to play High School Baseball at Mountainside.

Mountainside JBO is affiliated with Westside Youth Baseball and Junior Baseball Organization, who are aligned with the area High Schools, to provide a local and varied pool of competition. The two main differences between JBO and other youth baseball programs is that the teams are built with comparably skilled players. to maximize learning and development and high school baseball rules are incorporated (leading and stealing bases).