Complete school year calendar for Mount Sinai School District, Suffolk County. Includes all holidays, breaks, half days, and important dates from September 2026 through June 2027.
| Event | Date(s) | Status |
|---|---|---|
| First Day of School | September 8, 2026 (Tue) | School Opens |
| Labor Day | September 7, 2026 (Mon) | No School |
| Yom Kippur | September 21, 2026 (Mon) | No School |
| Columbus Day | October 12, 2026 (Mon) | No School |
| Election Day | November 3, 2026 (Tue) | Supt. Conf. Day |
| Veterans Day | November 11, 2026 (Wed) | No School |
| Thanksgiving Recess | November 25–27, 2026 (Wed–Fri) | No School |
| Winter Recess | Dec 24, 2026 – Jan 1, 2027 | No School |
| MLK Day | January 18, 2027 (Mon) | No School |
| Mid-Winter Recess | February 15–19, 2027 | No School |
| Eid al-Fitr | March 9, 2027 (Tue) | Supt. Conf. Day |
| Spring Recess (Easter) | March 26, 29, 2027 | No School |
| Spring Recess (Passover) | April 19–23, 2027 (Mon–Fri) | No School |
| Memorial Day | May 31, 2027 (Mon) | No School |
| Last Day of School | June 25, 2027 (Fri) | School Closes |
Complete month-by-month calendar from September 2026 to June 2027. Every day is color-coded so you can see school days, holidays, and breaks at a glance.
The Mount Sinai School District shapes the 2026-2027 educational timeline for roughly 2,200 North Shore students. As one of Suffolk County's most desirable districts, its calendar is scrutinized for its academic pacing and extensive extracurricular scheduling.
The Mount Sinai calendar is an exquisite act of suburban logistics. By housing its elementary, middle, and high schools on one massive campus property, the district uses the calendar to stagger professional development days and major athletic tournaments to prevent community-wide traffic gridlock. The schedule is also clearly front-loaded with winter storm defenses to protect essential springtime AP preparation.
For easy reference, use the button at the top of this page to download a free, color-coded printable Mount Sinai school calendar for your fridge or desk.
Data Source: Official Mount Sinai School District calendar publication.
Disclaimer: This website is not affiliated with, endorsed by, or connected to Mount Sinai School District or the New York State Education Department (NYSED). For the most current and official calendar, please visit www.mtsinai.k12.ny.us.
Official calendars can still change. Always confirm updates with the district before making plans.
Last updated: March 17, 2026