In March 2020, most schools in the U.S. transitioned to distance learning. During the transition a significant number of students did not fully engage in learning opportunities. This brief uses administrative panel data from the CORE Districts in California to approximate the impact of the pandemic by analyzing how absenteeism has affected student outcomes in the recent past. We show wide variation in absenteeism impacts on academic and social-emotional outcomes by grade and subgroup, as well as the cumulative effect of different degrees of absence. Student outcomes generally suffer more from absenteeism in mathematics than in English language arts. Negative effects are larger in middle school. Absences also negatively affect social-emotional development, which can affect other student outcomes down the line.