Of all elementary school years, absenteeism is at its peak during kindergarten. Although much has been established about the effects of missing kindergarten school days on achievement, nothing has yet been established on absenteeism and executive function (EF) skills. Yet developing EF skills early in school is critical, and missed in-school time might have long-term implications. To explore this link, we asked whether absenteeism in kindergarten was linked to both short- and long-term EF skill development. Using nationally representative data (N = 14,370) and employing fixed-effects modeling, we found that kindergarten absenteeism was linked to lower working memory and cognitive flexibility outcomes. The patterns varied based on definition of absenteeism, though our evidence does suggest long-term declines on EF skills seen through at least third grade.