Growing evidence illustrates the size and character of public-school enrollment declines during the COVID-19 pandemic. However, far less is known about where unenrolled students went. Using unique cross-sector enrollment and mobility data from the state of Hawaii, this study provides evidence that demographic changes and movement to private schools, out of the state, or to homeschooling did not account for the full loss of public-school students. Many unenrolled students appear to have redshirted or dropped out of formal education during school year (SY) 2020-21. Further, regression analyses with island fixed effects indicate that two pre-pandemic factors predicted school-level enrollment declines: (1) the share of the Pacific Islander students; and (2) whether the school had a high pupil-teacher ratio.