Complete school year calendar for Syosset CSD — one of Long Island's most academically acclaimed school districts, known for exceptional STEM programs and national rankings. Includes all holidays, breaks, half days, and important dates from September 2025 through June 2026.
| Event | Date(s) | Status |
|---|---|---|
| First Day of School | September 2, 2025 (Tue) | School Opens |
| Labor Day | September 1, 2025 (Mon) | No School |
| Rosh Hashanah | September 23–24, 2025 (Tue–Wed) | No School |
| Yom Kippur | October 2, 2025 (Thu) | No School |
| Columbus Day | October 13, 2025 (Mon) | No School |
| Diwali | October 20, 2025 (Mon) | No School |
| Veterans Day | November 11, 2025 (Tue) | No School |
| Thanksgiving Recess | November 27–28, 2025 (Thu–Fri) | No School |
| Winter Recess | Dec 24, 2025 – Jan 2, 2026 | No School |
| Martin Luther King Jr. Day | January 19, 2026 (Mon) | No School |
| Presidents' Week | February 16–20, 2026 (Mon–Fri) | No School |
| Eid al-Fitr | March 20, 2026 (Fri) | No School |
| Spring Recess | April 2–10, 2026 (Thu–Fri) | No School |
| Memorial Day | May 25, 2026 (Mon) | No School |
| Eid al-Adha | May 27, 2026 (Wed) | No School |
| Juneteenth | June 19, 2026 (Fri) | No School |
| Last Day of School | June 26, 2026 (Fri) | School Closes |
Complete month-by-month calendar from September 2025 to June 2026. Every day is color-coded so you can see school days, holidays, and breaks at a glance.
The Syosset Central School District 2025-2026 school year runs from September 3, 2025 to June 26, 2026. Syosset is widely recognized as one of the most elite and academically rigorous Long Island public schools, serving around 6,600 students across 10 schools in Nassau County.
Because of Syosset's highly competitive environment and emphasis on Ivy League admissions, families rely heavily on the school calendar to track AP exam weeks and SAT dates. Reflecting the changing demographics of the North Shore, the district ensures the calendar honors diversity by officially observing Diwali, Lunar New Year, and Eid al-Fitr as school closures.
For easy reference, use the button at the top of this page to download a free, color-coded printable Syosset school calendar for your fridge or desk.
Data Source: Official Syosset Central School District calendar publication.
Disclaimer: This website is not affiliated with, endorsed by, or connected to Syosset Central School District or the New York State Education Department (NYSED). For the most current and official calendar, please visit www.syossetschools.org.
Official calendars can still change. Always confirm updates with the district before making plans.
Last updated: March 17, 2026