BACKGROUND: "Bull City Fit" is a childhood obesity treatment partnership between Duke Children's pediatric weight management clinic and Durham Department of Parks and Recreation. OBJECTIVES: Report on feasibility and implementation, characteristics of participants, and predictors of attendance. METHODS: Mixed methods study consisting of (1) a retrospective cohort analysis (n = 171) reporting demographic, attendance, and clinical data and (2) structured focus groups among stakeholders to identify implementation facilitators and barriers. RESULTS: Higher attendance was associated with Spanish language ( P = .07), more clinic visits ( P = .03), shorter time to first attendance ( P = .06), lower child z-body mass index (BMI) at baseline ( P = .08), and lower parent BMI ( P = .02). Associations were mitigated after controlling for demographic characteristics. BMI z-score did not differ between low- and moderate/high attenders at 6 months. Family inclusion and community engagement emerged as positive themes during focus groups. CONCLUSIONS: Clinic-community partnerships engage diverse populations in fitness and nutrition activities, but no specific patient characteristics appear to predict greater attendance.