The current study investigated the prevalence and outcomes related to Head Start (HS) children's dual enrollment in state-funded prekindergarten (state Pre-K) using a secondary analysis of a statewide integrated administrative dataset (N = 2,986). It also explored whether a program partnership between HS and the local school district (within the same geographic service area) was associated with HS children's higher enrollment in Pre-K. Findings showed that over half of the children attending HS additionally participated in Pre-K. Such dual enrollment, which reflects more daily hours of center-based early care and education, predicted higher teacher-reported school readiness skills, including cognitive, language, literacy, math, physical, and social-emotional skills. The rate of HS children's dual enrollment was higher when their HS grantee had a stronger partnership with the local school district. Our findings highlight the importance of systematic efforts to maximize the utilization of ECE-allocated resources for low-income children.