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The current study tested the effects of Second Step® on changes in teacher-reported classroom social climates in a two-year cluster randomized trial across 61 U.S. schools (n = 31 treatment). The roles of teachers’ proactive classroom management and dosage (i.e., number of lessons taught) were also examined. Participants included 313 teachers in Year 1 and 447 in Year 2. In Year 1, classroom social climates improved in Second Step® schools when teachers used more proactive classroom management or taught more lessons. By the end of Year 2, program effects no longer related to these factors; all teachers in treatment schools reported greater reductions in negative classroom climates. Findings highlight opportunities for the even distribution of SEL benefits through classroom-level change.