The impact of Comprehensive School Physical Activity Programs (CSPAPs) on urban children's, educators', and parents' physical activity (PA) is relatively unknown. The purpose of this study was to explore overall changes in student, educator, and parent PA after an 8-month CSPAP-based program. This longitudinal, exploratory study implemented a CSPAP in 20 urban elementary schools, with six randomized for research. In-school PA was measured prepost for all fourth grade students using accelerometers. Parent and educator PA was self-reported using the IPAQ. RM-ANOVAs revealed significant prepost increases in minutes of student MVPA (P < 0.001). Parents significantly increased PA (P < 0.01) and although educators' reported change in PA, it was not statistically significant (P = 0.50). This study provides unique information about the potential influence of one CSPAP on students' overall PA, PA by individual context within the school, the differential PA patterns by race, and PA changes for educators and parents.