Columbia Public Schools Calendar, first day of school, last day of school, winter break, spring break, summer school, teacher workdays, early release days, holiday schedule, school holidays, academic calendar, school year dates, Jump Start Day, Memorial Day, Juneteenth, federal holidays, school closures, school start and end dates, CPS calendar, CPS district calendar https://nycschoolcalendar.info/columbia-public-schools-calendar/