Complete school year calendar for Williamsville Central School District. 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 |
| Rosh Hashanah | Sep 23, 2025 (Tue) | No School |
| Yom Kippur / Fall Recess | Oct 2, 2025 (Thu) | No School |
| Columbus Day / Indigenous Peoples' Day | Oct 13, 2025 (Mon) | No School |
| Diwali (Supt. Conference Day) | Oct 20, 2025 (Mon) | No School |
| Veterans Day | Nov 11, 2025 (Tue) | No School |
| Thanksgiving Recess | Nov 27–28, 2025 (Thu–Fri) | No School |
| Winter Recess | Dec 22, 2025 – Jan 2, 2026 | No School |
| MLK Day | Jan 19, 2026 (Mon) | No School |
| Mid-Winter Recess | Feb 17–21, 2026 (Mon–Fri) | No School |
| Spring Recess | Apr 3–10, 2026 (Thu–Fri) | No School |
| Eid al-Fitr (Supt. Conference Day) | Mar 20, 2026 (Fri) | No School |
| Memorial Day | May 25, 2026 (Mon) | No School |
| Eid al-Adha (Supt. Conference Day) | May 27, 2026 (Wed) | No School |
| Juneteenth | Jun 19, 2026 (Fri) | No School |
| Last Day of School | June 25, 2026 (Thu) | 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 Williamsville Central School District 2025-2026 school year serves nearly 10,000 students, reigning as the absolute largest and most prestigious suburban school district in Western New York (Erie County). It operates three distinct, highly competitive high schools (North, South, and East).
Williamsville's calendar is highly dictated by two major factors: elite academic benchmarking and brutal Buffalo-area winter weather. As the premier academic destination in the Buffalo suburbs, the schedule is tightly packed with AP testing, state music festivals, and immense athletic rivalries. Crucially, because it sits directly in the crosshairs of Lake Erie's notorious lake-effect snow bands, the calendar integrates numerous, fiercely protected emergency snow days to guarantee that the district meets NYSED instructional requirements despite frequent rapid-onset blizzards.
For easy reference, use the button at the top of this page to download a free, color-coded printable Williamsville school calendar for your fridge or classroom.
Data Source: Official Williamsville Central School District calendar publication.
Disclaimer: This website is not affiliated with, endorsed by, or connected to Williamsville Central School District or the New York State Education Department (NYSED). For the most current and official calendar, please visit www.williamsvillek12.org.
Official calendars can still change. Always confirm updates with the district before making plans.
Last updated: March 17, 2026