This study sheds light on the interrelations of universal, school-based social-emotional learning strategies and ethnic-racial identity over time. We assessed exposure to social-emotional learning practices and ethnic-racial identity exploration and resolution among 367 middle school students (70% African American, 30% Latinx; 51% girls) across 3 years. The results of a latent growth model with social-emotional learning practices as a time-varying covariate suggest that practices that afford youth opportunities for autonomy, prosocial behavioral routines, and collaboration in the context of homerooms (advisories) and classrooms were consistently associated with greater ethnic-racial identity exploration and resolution across the middle school years. Theoretical and practical implications for the potential of school-based social-emotional learning to support the development of cultural assets such as ethnic-racial identity are discussed.