These competitive groups based on school colors were established when the school was founded in 1880. All members of the Newton Country Day community are inducted into either the Blue or Silver team during the fall of their first year at NCDS. The purpose of these teams is to involve the entire community in different types of constructive competition.
Throughout the year the teams compete for points not only in athletic endeavors, but also in various areas of school life, including school spirit, and participation and attendance at school events. At the end of the year, the team with the greater number of points is awarded the Blue-Silver Trophy.