Recent policy dialogue suggests that chronic absenteeism is not only underdocumented, but is also detrimental to the success of students as early as kindergarten. That said, almost no empirical research has examined the effects of chronic absenteeism on student outcomes. This study addresses this underresearched issue in more depth. Using a nationally representative dataset of kindergarten students from the 2010-2011 school year, this study evaluates the effect of chronic absenteeism on both achievement and socioemotional outcomes. The findings suggest that chronic absenteeism reduces math and reading achievement outcomes, reduces educational engagement, and decreases social engagement. Hence, this study offers new evidence on how an undermeasured aspect of missing school impedes students' attainment. Implications for policy and practice are discussed.