Official Williamsville 2025-2026 school calendar with holidays, breaks, PDF, and calendar sync. Complete school year calendar for Williamsville Central School District. Includes all holidays, breaks, half days, and important dates from September 2025 through June 2026. Dates are manually collected and screened from district-published calendar materials. Printable PDF and Google/Apple Calendar sync options are available below. Updated March 17, 2026.
| Event | Date(s) | Status |
|---|---|---|
| First Day of School | September 2, 2025 (Tue) | School Opens |
| Rosh Hashanah | September 23, 2025 (Tue) | No School |
| Yom Kippur | October 2, 2025 (Thu) | No School |
| Columbus Day | October 13, 2025 (Mon) | No School |
| Diwali | October 20, 2025 (Mon) | No School |
| Veterans Day | November 11, 2025 (Tue) | No School |
| Thanksgiving | November 27, 2025 (Thu) | No School |
| Day after Thanksgiving | November 28, 2025 (Fri) | No School |
| Winter Recess | December 22, 2025 - January 2, 2026 | No School |
| Martin Luther King Jr. Day | January 19, 2026 (Mon) | No School |
| Midwinter Recess | February 17, 2026 - February 21, 2026 | No School |
| Eid al-Fitr | March 20, 2026 (Fri) | No School |
| Spring Recess | April 3, 2026 - April 10, 2026 | No School |
| Memorial Day | May 25, 2026 (Mon) | No School |
| Eid al-Adha | May 27, 2026 (Wed) | No School |
| Juneteenth | June 19, 2026 (Fri) | No School |
| Last Day of School | June 25, 2026 (Thu) | School Closes |
View the full 2025-2026 school year by month.
Williamsville Central School District is listed here with official 2025-2026 calendar data. The student year starts on Tuesday, September 2, 2025 and ends on Thursday, June 25, 2026.
The main multi-day closure blocks are Winter Recess (Monday, December 22, 2025 through Friday, January 2, 2026), Mid-Winter Recess (Tuesday, February 17, 2026 through Saturday, February 21, 2026), Spring Recess (Friday, April 3, 2026 through Friday, April 10, 2026).
Single-day closures and important calendar items include Rosh Hashanah (Tuesday, September 23, 2025), Yom Kippur (Thursday, October 2, 2025), Columbus Day (Monday, October 13, 2025), Diwali (Monday, October 20, 2025), Veterans Day (Tuesday, November 11, 2025), Thanksgiving (Thursday, November 27, 2025), Day after Thanksgiving (Friday, November 28, 2025), MLK Day (Monday, January 19, 2026), plus additional dated items in the table below.
Data source & handling: Official calendar from Williamsville Central School District (williamsvillek12.org). We manually collect and screen dates from district materials, then organize them into key dates, printable PDF, and calendar sync.
Disclaimer: This site is not affiliated with Williamsville Central School District or NYSED. Official calendars can change - always check williamsvillek12.org before making plans.
Last updated: March 17, 2026