This study contributed to the school readiness literature by examining the factor structure and reliability of a revised version of the Kindergarten Student Entrance Profile (KSEP). Teachers rated 579 Latino/a children during the first month of kindergarten using the KSEP. Factor analysis procedures (exploratory factor analysis [EFA] and confirmatory factor analysis [CFA]) supported a two-factor solution, social-emotional (SE; a = 0.88), cognitive (COG; a = 0.81), factor loadings > 0.51. These results provide evidence supporting the interpretation of KSEP ratings as distinct measures of Latino/a children's SE and COG readiness at the time of kindergarten entry. Additional implications of the findings are also discussed.