In this study, we use a large-scale (n = 33,717) ethnically diverse (59% Latinx, 34% Black, and 7% White/other) largely low-income sample to assess the predictive power of a wide range of school readiness skills measured at age four in preschool on authentic academic outcomes through Grade 5. Specifically, we explored the extent to which cognitive, language, fine motor, gross motor, and socioemotional skills at age four are related to GPA, standardized test scores, likelihood of retention, and likelihood of suspension in Kindergarten and key grades through Grade 5. (author abstract)