The present research examines whether children's daily attendance rates would be predictive of gains in expressive language within the context of high-quality preschool classrooms. The quality of preschool classrooms was assessed by measuring the quality of the teacher's interactions with the children in his or her classroom. Hierarchical linear models, nesting children within classroom, were used to examine children's growth in expressive language in two independent samples (n = 129 children in 14 classrooms; n = 160 children in 46 classrooms). Results showed positive relations between daily attendance and language gains for children enrolled in higher quality preschool classrooms. Findings suggest that at-risk children who are rarely absent from high-quality preschool classrooms show accelerated expressive language growth, thus indicating that preschool attendance is an important factor to consider in future research and policy decisions.