Math and Science Story Time (MASST) program is a library-based informal education program that aims to increase access to high-quality early science, technology, engineering, and mathematics (STEM) books, activities, and content for young children. We developed and piloted resources to expand MASST beyond a family engagement program by inviting preschools to participate in the program. The purpose was to connect the local library with preschool classrooms, provide resources for educators, and bridge the gap between formal and informal learning environments. The present study examines the effects of participation in MASST on preschool educators and children