Important Horseheads CSD dates include school openings, professional development days, long weekends, winter and spring breaks, and end-of-year ceremonies. These scheduled events help students, parents, and staff prepare for academic transitions, family planning, and district-wide activities throughout the school year. https://diytemplates.wordpress.com/2025/11/18/important-dates-in-the-horseheads-central-school-district-calendar/