All schools in the United States must go 180 days/year in order to receive federal funding. In NJ, our schools generally let out toward the end of June and begin just after Labor Day. We have a week at Christmas and a week at Easter off and a few scattered holidays.
Over the summer, the schools are brimming with activities... rented for a plethora of different camps, extended school year (summer school) for students who qualify and all renovations and cleaning takes place. There is a buzz of activities that most don't know occurs.