Little is known about the prevalence of posttraumatic stress disorder (PTSD) in adult alumni of foster care and its demographic and contextual correlates. This is one of the first studies to report on racial/ethnic and gender differences and the influence of foster care experiences (i.e., revictimization during foster care, placement change rate, and placement in kinship care) on past year PTSD. Findings revealed significant gender disparities and a moderating influence of kinship care on the relationship between gender and PTSD, as well as increased risk associated with a history of emotional and sexual abuse. Recommendations are made for clinical and systemic intervention. (Contains 3 tables and 1 figure.)