To get the most accurate answer to your question, I suggest contacting the school directly. If you don't have the telephone number for the school handy, you may use SchoolFinder (link below). SchoolFinder also includes the telephone numbers for school districts (should the school be closed for the summer).
At my daughter's school (in California), the calendar for the upcoming year was distributed with the end of school packet of materials sent home with students. The district also includes the dates on their website, as does the PTA on the school website they maintain. I hope you're able to get in touch with the school, district or PTA for your child's school. Thanks for asking!