The purpose of the study was to explore the effectiveness of a brief, feasible, and cost-effective universal screener for kindergarten readiness. The study examined whether teacher ratings of kindergarteners' academic, behavioral, and overall readiness at the beginning of the year were predictive of academic, emotional, and behavioral outcomes at the end of the year. Participants included 19 kindergarten teachers and their students (n = 350) from 6 urban elementary schools; all teachers were female and the majority of children were African American (74%) or White (23%). Thirty-six percent of children qualified for free or reduced lunch. Teachers completed single-item ratings of student readiness as well as full scale ratings of student prosocial skills, disruptive behaviors, and academic competence. Students also completed a standardized academic achievement test. Independent observers rated disruptive behaviors in the classroom. Readiness items had statistically significant relations with a range of academic, emotional, and behavior indicators. Hierarchical linear regression analyses found that readiness items predicted end-of-year outcomes when controlling for baseline covariates. Items also predicted higher likelihood of negative academic and behavior categorical outcomes and demonstrated classification utility. Schools need universal screening options that are feasible and easy to implement school-wide. The screening tool presented in this study offers a viable, psychometrically strong option for school teams and professionals interested in universal screening.