Official Syosset 2025-2026 school calendar with holidays, breaks, PDF, and calendar sync. 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. Dates are manually collected and screened from district-published calendar materials. Printable PDF and Google/Apple Calendar sync options are available below. Updated March 17, 2026.
| Event | Date(s) | Status |
|---|---|---|
| First Day of School | September 2, 2025 (Tue) | School Opens |
| District closed - Rosh Hashanah | September 23, 2025 - September 24, 2025 | No School |
| District closed - Yom Kippur | October 2, 2025 (Thu) | No School |
| District closed - Columbus Day | October 13, 2025 (Mon) | No School |
| District closed - Diwali | October 20, 2025 (Mon) | No School |
| Election Day | November 4, 2025 (Tue) | No School |
| District closed - Veteran's Day | November 11, 2025 (Tue) | No School |
| District closed - Thanksgiving Recess | November 27, 2025 - November 28, 2025 | No School |
| Winter Recess | December 24, 2025 - January 2, 2026 | No School |
| District closed - Martin Luther King, Jr. Day | January 19, 2026 (Mon) | No School |
| Midwinter Recess | February 16, 2026 - February 20, 2026 | No School |
| District closed - Eid al-Fitr | March 20, 2026 (Fri) | No School |
| Spring Recess | April 2, 2026 - April 10, 2026 | No School |
| District closed - Memorial Day | May 25, 2026 (Mon) | No School |
| Snow make up day - District closed if no snow days | May 26, 2026 (Tue) | No School |
| District closed - Eid al-Adha | May 27, 2026 (Wed) | No School |
| District closed - Juneteenth | June 19, 2026 (Fri) | No School |
| Last Day of School | June 26, 2026 (Fri) | School Closes |
View the full 2025-2026 school year by month.
Syosset Central School District is listed here with official 2025-2026 calendar data. The student year starts on Tuesday, September 2, 2025 and ends on Friday, June 26, 2026.
The main multi-day closure blocks are District closed - Rosh Hashanah (Tuesday, September 23, 2025 through Wednesday, September 24, 2025), District closed - Thanksgiving Recess (Thursday, November 27, 2025 through Friday, November 28, 2025), Schools closed - Winter Recess (Wednesday, December 24, 2025 through Friday, January 2, 2026), Mid-Winter Recess (Monday, February 16, 2026 through Friday, February 20, 2026), Schools closed - Spring Recess (Thursday, April 2, 2026 through Friday, April 10, 2026).
Single-day closures and important calendar items include District closed - Yom Kippur (Thursday, October 2, 2025), District closed - Columbus Day (Monday, October 13, 2025), District closed - Diwali (Monday, October 20, 2025), Schools closed to students - Superintendent's Conference Day & Election Day (Tuesday, November 4, 2025), District closed - Veteran's Day (Tuesday, November 11, 2025), District closed - Martin Luther King, Jr. Day (Monday, January 19, 2026), District closed - Eid al-Fitr (Friday, March 20, 2026), District closed - Memorial Day (Monday, May 25, 2026), plus additional dated items in the table below.
Data source & handling: Official calendar from Syosset Central School District (syossetschools.org). We manually collect and screen dates from district materials, then organize them into key dates, printable PDF, and calendar sync.
Disclaimer: This site is not affiliated with Syosset Central School District or NYSED. Official calendars can change - always check syossetschools.org before making plans.
Last updated: March 17, 2026