German School Holidays by State is a free calendar you can subscribe to on Nundina, with 128 dates listed. Data from OpenHolidays. Subscribe to it on Nundina and every date lands in your own calendar, updated automatically.
Schulferien for each of the sixteen Bundesländer with that state exact first and last day - Sommerferien, Herbstferien, Weihnachtsferien, Osterferien and the rest. Germany staggers them on purpose, so only your own state dates are any use. Dates are for general schools; Mecklenburg-Vorpommern vocational schools follow a separate calendar that is not shown here.
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