I'm in central NYS. Our school district has not yet published the 2018-2019 calendar. We are typically off either the week before Easter or Good Friday plus the week following Easter. Since Easter is later next year, I'm going to guess that it will be the week leading up to Easter. We don't usually get Easter Monday if break is before Easter, but I can always hope.
We start the Wednesday after Labor Day and get out at the end of June. High school students go in only for exams starting 6/12 (this year). Middle and elementary students are finished 6/21, and graduation is 6/23. This shifts around as Labor Day does, though. I remember that my oldest graduated on 6/27 a few years ago. There are 5 snow days built into the calendar, but if extra are needed, they come out of Spring Break, Presidents' Day, Memorial Day, etc. and don't typically impact the end of the year.