From August 2019 through December 2023, the National Institute on Out-of-School Time (NIOST) partnered with 14 Philadelphia out-of-school time (OST) programs as part of the Philadelphia Out-of-School Time Literacy and Quality Improvement Initiative, funded by the William Penn Foundation to create and sustain literacy-rich environments. Early findings from the first five programs of this project are captured in the paper “Coaching to Improve OST Literacy Programming,” available at https://www.niost.org/Afterschool-Matters-Spring-2022/coaching-to-improve-ost-literacy-programming. In the fall of 2022, building on the original three years of project work, nine new programs participated in an initial onboarding phase followed by an implementation phase. This research brief captures findings from the work with the Philadelphia programs.