Schools in Germany teach year round with vacations in the course of the school year and the different states going on vacation at different times. They are on a rotating schedule, so Berlin, for example, is not on vacation at the same time as North-Rhine-Westphalia where Cologne is located. All schools get six weeks of summer vacation and two weeks in the fall, two weeks around Christmas and two weeks for Easter. See calendar below.
22-23 school calendar NRW