However, as many as 10% to 27% of children enter kindergarten exhibiting serious social, emotional, and behavioral problems-with 4% to 6% of children having serious emotional and behavioral disorders (Lee, Brooks-Gunn, Han, Waldfogel, & Zhai, 2014; Raver & Knitze, 2002). Although early identification of emotional and behavioral problems is possible, most early behavioral and emotional problems go unaddressed in schools, which often creates barriers for learning for all students (Adelman & Taylor, 2010; Stormont, Reinke, Herman, & Lembke, 2012). Furthermore, children who exhibit early signs and symptoms of challenging behaviors are more likely to develop serious aggressive and antisocial behavioral patterns that are resistant to intervention (Walker, Ramsey, & Gresham, 2004). Therefore, it is critical to identify students in need of additional social, emotional, and behavioral supports as the start of school (McWayne, Hahs-Vaughn, Cheung, & Wright, 2011). Coupled with the widespread adoption of multi-tiered systems of support in U.S. schools (e.g., response to intervention, positive behavior interventions and supports), universal screening is a critical component to providing early school-based prevention and intervention services (McWayne et al., 2011; Stormont et al., 2012). Universal approaches to systematic screening need to be implemented as early as possible in the primary grades. Kindergarten marks an important transition with new or different expectations for children and a juncture to implement universal screening. Accordingly, a main purpose of this study was to extend prior research on a single item first gate screener for school readiness in kindergarten. The single item screener is the overall readiness for kindergarten item from the Kindergarten Academic and Behavior Readiness Screener 652070A EIXXX10.