Changes in perceptions of discrimination were examined with 668 Latino students (62% Mexican American; 56% female; M[subscript age] = 14.6 years). Adolescents' reports of discrimination increased across the first 2 years of high school. Perceptions of discrimination were higher for boys and for primary language brokers, as well as for adolescents in schools with more ethnically diverse student bodies but a less diverse teaching staff. Path analysis revealed that higher levels of discrimination and increases in discrimination across time influenced Latino adolescents' academic outcomes (i.e., grades, absences) indirectly via their influences on perceptions of school climate. Findings highlight previously understudied individual and school contextual factors that shape experiences of discrimination and the mechanisms by which discrimination indirectly influences Latino adolescents' outcomes.