This study describes the transition of a preschool STEM school readiness program from in-person to virtual programming during the early pandemic phase, examines in-person and virtual program data to understand the effectiveness of these two program delivery modes, and presents lessons learned from this abrupt transition. Results suggest that in-person and virtual classes were effective and equivalent on parent ratings and program monitoring variables. Future study will be needed to fully determine the cost-benefit impacts of in-person, virtual, and hybrid program delivery models on STEM school readiness and other family engagement programs.