This study evaluated participation in the "Imagination Library" early childhood literacy enrichment program and children's pre-literacy and pre-numeracy skills at kindergarten entry in an urban school district. Previous studies have demonstrated that program participation is associated with greater early childhood reading practices. Results presented in this article suggest that program participation is also positively and significantly associated with higher early language and math scores, even after controlling for other key factors associated with kindergarten readiness. These results offer support for policy interventions designed to advance kindergarten readiness by increasing access to early literacy materials for families with young children.