Complete school year calendar for Cold Spring Harbor CSD — a top-ranked Long Island district named after its historic whaling village on the North Shore. Includes all holidays, breaks, half days, and important dates from September 2026 through June 2027.
| Event | Date(s) | Status |
|---|---|---|
| First Day of School | September 1, 2026 (Tue) | School Opens |
| Labor Day Weekend | September 4 & 7, 2026 (Fri & 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 |
| Rev. Dr. Martin Luther King Jr. Day | January 18, 2027 (Mon) | No School |
| Mid-Winter Recess | February 15–19, 2027 (Mon–Fri) | No School |
| Spring Recess I | March 25–29, 2027 (Thu–Mon) | No School |
| Spring Recess II | April 19–23, 2027 (Mon–Fri) | No School |
| Memorial Day Weekend | May 28 & 31, 2027 (Fri & Mon) | No School |
| Juneteenth (Observed) | June 18, 2027 (Fri) | 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 Cold Spring Harbor Central School District 2026-2027 school year runs from September 1, 2026 to June 25, 2027. This calendar was adopted by the Board of Education on January 13, 2026. Cold Spring Harbor is one of Long Island's most elite districts, consistently ranked among the top 5 on Long Island, with exceptional AP pass rates and college placement. Neighboring Huntington.
The calendar features two spring recesses (March 25-29 and April 19-23) and 181 student days with 3 conference days.
Sep 1, 2026.
Jun 25, 2027.
Dec 24 – Jan 2. Students return the next school day.
Apr 2-10, 2027.
Feb 15-19, 2027.
181 student days. Approved January 13, 2026.
While the famous Cold Spring Harbor Laboratory (DNA research) is in the community, it is separate from the school district. However, the district benefits from STEM partnerships.
CSH is one of Long Island's smallest districts, with approximately 1,800 students across 3 elementary schools, 1 middle school, and 1 high school.
Data Source: This calendar is based on projected dates derived from historical Cold Spring Harbor Central School District scheduling patterns.
Disclaimer: This website is not affiliated with, endorsed by, or connected to Cold Spring Harbor Central School District or the New York State Education Department (NYSED). For the most current and official calendar, please visit www.csh.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