This study evaluated the utility of the social competence scale (SCS)-parent version, a measure of social competence developed for children of elementary school age, for use with preschool-age children. Data were derived from two samples of preschoolers: a community sample assessed at enrollment to pre-kindergarten programs and a high-risk sample of children at familial risk for conduct problems participating in a preventive intervention trial. Using data from both samples, we assessed the factor structure, internal consistency, and stability of the SCS, and whether the SCS discriminated the high-risk sample from the community sample. Results support the utility and construct validity of the SCS for use in preschoolers. The total SCS scale was relatively stable over 24 months during the preschool period and was correlated with other measures of social competence, parent ratings of emotion regulation, lability and behavior problems, and tests of child cognitive ability.