Mount Sinai School District Calendar 2026-2027

Official Mount Sinai 2026-2027 school calendar with holidays, breaks, PDF, and calendar sync. 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. 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.

First Day
September 8, 2026
Winter Break
December 24, 2026
- January 1, 2027
Spring Break
March 26, 2027
Last Day
June 25, 2027
Key dates for Mount Sinai School District 2026-2027 school year
Event Date(s) Status
First Day of School September 8, 2026 (Tue) School Opens
Yom Kippur September 21, 2026 (Mon) No School
Columbus Day October 12, 2026 (Mon) No School
Thanksgiving Recess November 25, 2026 - November 27, 2026 No School
Winter Recess December 24, 2026 - January 1, 2027 No School
Martin Luther King Jr. January 18, 2027 (Mon) No School
Midwinter Recess February 15, 2027 - February 19, 2027 No School
Spring Recess 1 - Easter March 26, 2027 (Fri) No School
Spring Recess 1 - Easter March 29, 2027 (Mon) No School
Spring Recess 2 - Passover April 19, 2027 - April 23, 2027 No School
Memorial Day May 31, 2027 (Mon) No School
Last Day of School June 25, 2027 (Fri) School Closes

Monthly Calendar

View the full 2026-2027 school year by month.

School Day
Weekend
Holiday (No School)
School Break
First / Last Day
Important Date

Mount Sinai Calendar Notes

Mount Sinai School District is listed here with official 2026-2027 calendar data. The student year starts on Tuesday, September 8, 2026 and ends on Friday, June 25, 2027.

The main multi-day closure blocks are Thanksgiving Recess (Wednesday, November 25, 2026 through Friday, November 27, 2026), Winter Recess (Thursday, December 24, 2026 through Friday, January 1, 2027), Mid-Winter Recess (Monday, February 15, 2027 through Friday, February 19, 2027), Spring Recess 2 - Passover (Monday, April 19, 2027 through Friday, April 23, 2027).

Single-day closures and important calendar items include Yom Kippur (Monday, September 21, 2026), Columbus Day (Monday, October 12, 2026), Veteran's Day (Wednesday, November 11, 2026), Martin Luther King Jr. (Monday, January 18, 2027), Spring Recess 1 - Easter (Friday, March 26, 2027), Spring Recess 1 - Easter (Monday, March 29, 2027), Unused Snow Day (If needed) (Monday, May 17, 2027), Unused Snow Day (If needed) (Thursday, May 27, 2027), plus additional dated items in the table below.

Frequently Asked Questions

The first day of school is Tuesday, September 8, 2026.
The last day of school is Friday, June 25, 2027.
Winter Recess runs from Thursday, December 24, 2026 through Friday, January 1, 2027.
Spring Recess 2 - Passover runs from Monday, April 19, 2027 through Friday, April 23, 2027.
Mid-Winter Recess runs from Monday, February 15, 2027 through Friday, February 19, 2027.
This FAQ does not control the dated calendar table. Use the structured dates above for start day, last day, closures, and break windows, and check the district source document for attendance-day counts, approval history, or revision notes.
The structured calendar data for Mount Sinai School District 2026-2027 does not list Eid al-Fitr as a separate dated item.
Mount Sinai is located in Long Island. Nearby school districts include Smithtown, Port Washington and Commack. Each district sets its own academic calendar, though break schedules in the same region often align.

Related Calendars

About This Calendar

Data source & handling: Official calendar from Mount Sinai School District (mtsinai.k12.ny.us). 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 Mount Sinai School District or NYSED. Official calendars can change - always check mtsinai.k12.ny.us before making plans.

Last updated: March 17, 2026