This study examined whether pre-K benefits persist through the end of first grade and the extent to which persistence differs based on outcome domains, subsequent classroom environments, and key subgroups of children. Data from 2,351 children living in a large and diverse county in Virginia revealed that the initial benefits of pre-K for academic and executive function persisted through the end of first grade but were 75% to 80% smaller than at kindergarten entry. Kindergarten and first-grade classroom environments did not sustain pre-K benefits. Although the initial benefits of pre-K were larger for dual language learners and children in poverty relative to English speakers and low-income children, there were no differential benefits by the end of first grade. (author abstract)