Cold Spring Harbor Central School District Calendar 2025–2026

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.

Official dates — These dates are based on the approved Cold Spring Harbor Central School District 2025-2026 board calendar.

Key Dates at a Glance

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Key dates for Cold Spring Harbor Central School District 2025-2026 school year
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

Cold Spring Harbor School Calendar 2025–2026

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.

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

Cold Spring Harbor District Overview

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.

Frequently Asked Questions

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 CSD is consistently ranked in the top 10 on Long Island, alongside Jericho, Syosset, and Manhasset. The district achieves near-perfect Regents pass rates.
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.
Cold Spring Harbor is located in Long Island. Nearby school districts include Huntington, Syosset and Commack. Each district sets its own academic calendar, though break schedules in the same region often align.

About This Calendar

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