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 runs from September 2, 2025 to June 26, 2026. Cold Spring Harbor is one of the smallest and highest-ranked districts on Long Island, serving approximately 2,000 students across 4 schools in a picturesque North Shore village in western Suffolk County.
Named after the historic Cold Spring Harbor Laboratory — where James Watson conducted pioneering DNA research — the district is steeped in scientific legacy. Cold Spring Harbor is consistently ranked in the top 10 school districts on Long Island and is known for exceptional science programs, competitive athletics, and a tight-knit community. The district neighbors Huntington and Syosset.
The first day is Tuesday, September 2, 2025.
Winter Recess runs from December 24–31, 2025.
Spring Recess runs from April 2–10, 2026.
The last day is Friday, June 26, 2026.
Cold Spring Harbor serves approximately 2,000 students across just 4 schools — one of the smallest top-ranked districts on Long Island. The small size creates an intimate, personalized educational environment.
The district is named after the same village as the world-famous Cold Spring Harbor Laboratory (CSHL), where the structure of DNA was studied. While the lab and the school district are separate entities, the scientific legacy deeply influences the community, and the district's STEM programs are among the strongest on Long Island.
Yes. Cold Spring Harbor observes both Friday, May 22 and Monday, May 25, 2026 off for Memorial Day weekend — giving students a 4-day weekend. This is more generous than most districts, which only close on Monday.
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 11, 2026