This study aims to tackle positive and negative intergroup contact in school and out-of-school contexts to test whether a spillover effect (i.e., the extent to which experiences that individuals have in one context spill over into another) applies to intergroup contact. Participants were 984 adolescents (M
age = 14.66; 62.7% female; 24.8% ethnic minority). Results indicated that positive contact in school was related over time to higher positive contact in out-of-school contexts and vice versa (i.e., valence consistent spillover effect). Positive contact in school was linked over time to lower negative contact in out-of-school contexts (i.e., valence inconsistent spillover effect). Overall, this study provides novel insights into the transmission of adolescents’ intergroup contact across socialization contexts by emphasizing the leading role of positive contact in schools.