This Statistics in Brief investigates some factors that may contribute to achievement gaps in the summer after kindergarten, including differences in children's experiences, such as participation in summer care arrangements, programs, and activities. Specifically, the brief describes students' summer nonparental care arrangements, program attendance (e.g., at summer camps or summer school), participation in activities with family members in a typical week, and places visited with family members. Participation in summer activities is compared by two socioeconomic characteristics--household poverty status and parents' highest level of education--utilizing data from the Early Childhood Longitudinal Study, Kindergarten Class of 2010-11 (ECLS-K:2011). (author abstract)