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 2025 through June 2026.
| Event | Date(s) | Status |
|---|---|---|
| First Day of School | September 2, 2025 (Tue) | School Opens |
| Labor Day | September 1, 2025 (Mon) | No School |
| Rosh Hashanah | September 23–24, 2025 (Tue–Wed) | No School |
| Yom Kippur | October 2, 2025 (Thu) | No School |
| Columbus Day | October 13, 2025 (Mon) | No School |
| Veterans Day | November 11, 2025 (Tue) | No School |
| Thanksgiving Recess | November 26–28, 2025 (Wed–Fri) | No School |
| Winter Recess | Dec 24–31, 2025 | No School |
| Martin Luther King Jr. Day | January 19, 2026 (Mon) | No School |
| Mid-Winter Recess | February 16–20, 2026 (Mon–Fri) | No School |
| Spring Recess | April 2–10, 2026 | No School |
| Memorial Day Weekend | May 22 & 25, 2026 | No School |
| Juneteenth | June 19, 2026 (Fri) | No School |
| Last Day of School | June 26, 2026 (Fri) | School Closes |
Complete month-by-month calendar from September 2025 to June 2026. Every day is color-coded so you can see school days, holidays, and breaks at a glance.
The Cold Spring Harbor Central School District 2025-2026 school year serves an intimate population of approximately 1,800 students, straddling the immensely wealthy border between Nassau and Suffolk counties on Long Island's North Shore.
As one of the smallest yet highest-performing public school districts in New York, Cold Spring Harbor operates with a bespoke, almost private-school-like calendar. The district maintains incredibly close ties with the local Cold Spring Harbor Laboratory, emphasizing an elite bioscience and research curriculum. Consequently, the school calendar is fiercely protected to maximize uninterrupted instruction time before state and national science block assessments, while still allowing for traditional, long-form holiday recesses favored by the affluent community.
For easy reference, use the button at the top of this page to download a free, color-coded printable Cold Spring Harbor school calendar for your fridge or desk.
Data Source: Official Cold Spring Harbor Central School District calendar publication.
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.
Official calendars can still change. Always confirm updates with the district before making plans.
Last updated: March 17, 2026