Patterns of afterschool activities were studied in low-income, ethnically diverse children (n ¼ 1796, M age ¼ 8.7 yrs). Cluster analyses indicated four reliable clusters: (a) regular participation in a high-quality afterschool program, (b) regular participation at the afterschool program combined with other extracurricular activities, (c) unsupervised time afterschool combined with extracurricular activities, and (d) low participation in any of these settings. Children who regularly attended a high-quality afterschool program alone or combined with extracurricular activities were reported by teachers to have higher academic performance, work habits, and task persistence, and less aggression towards peers compared to children whose afterschool hours combined unsupervised time with extracurricular activities. Attending high-quality afterschool programs alone and in combination with extracurricular activities also were associated with child self-reports of less misconduct compared to unsupervised time combined with extracurricular activities. These findings indicate the value of high-quality afterschool programs for children growing up in poverty.To help address this inequity, federal programs like the 21 st Century Community Learning Centers (U. S. Department of Education, 2020) as well as some state and local initiatives (Bodilly et al., 2010; California Department of Education, 2020) provide some support for afterschool programs in high-poverty schools in the United States. The goal of these programs, like the goal of publicly funded early childhood programs such as Head Start, is to break the cycle of poverty by providing low-income children with learning opportunities that will enable them to succeed at school. The aim of the current study is to examine the afterschool settings of low-income children whose schools offered high-quality 5-day a-week afterschool programs and to contrast the academic, social, and behavioral outcomes of children who regularly attended these programs alone and in conjunction with other extracurricular activities after controlling for child and family factors. Drawing on the National Research Council's report that identified key features of programs that successfully support youth development (Eccles & Gootman, 2002), the current study defines high quality in terms of children's experiences at the