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 2026-2027 runs from September 8, 2026 to June 25, 2027. Approved February 2026. 181 student days.
Two spring recesses: Easter (March 26, 29) and Passover (April 19-23). Eid al-Fitr (March 9) is a conference day.
Tuesday, September 8, 2026.
Friday, June 25, 2027.
December 24, 2026 through January 1, 2027.
March 30 – April 19, 2027.
February 15-19, 2027.
181 student days. Board approved March 3, 2026.
Mount Sinai's spring recess begins March 30, which coincides with Eid al-Fitr.
Data Source: This calendar is based on projected dates derived from historical Mount Sinai School District scheduling patterns.
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.
Dates are subject to change. Religious holiday dates are approximate and based on projected lunar calendar calculations.
Last updated: March 13, 2026