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School Open
Dismissal: 3:30 PM
Next 7 Days
April 2026
Coming Up
School Breaks
Holidays (No School)
The Mississippi Valley Community Unit School District 166 school calendar for the 2025-26 school year runs from Tuesday, September 2, 2025 to Wednesday, May 27, 2026 in Illinois.
- •5 scheduled breaks and 2 holidays throughout the year
- •Spring break: Mar 21 – Mar 25
- •Winter break: Dec 24 – Jan 2
Mississippi Valley Community Unit School District 166 starts school 156 days earlier than most Illinois districts.
Download the iCal file above to sync all Mississippi Valley Community Unit School District 166 dates with your phone or computer.
Frequently Asked Questions
Is Mississippi Valley Community Unit School District 166 school open today?
Yes, Mississippi Valley Community Unit School District 166 is open today. Check the weekly calendar above for upcoming school days and closures.
When is the next day off for Mississippi Valley Community Unit School District 166?
The next day off is Monday, May 25, 2026 for Memorial Day.
When is the first day of school for Mississippi Valley Community Unit School District 166?
The first day of school for Mississippi Valley Community Unit School District 166 in 2025-26 is Tuesday, September 2, 2025.
When is the last day of school for Mississippi Valley Community Unit School District 166?
The last day of school for Mississippi Valley Community Unit School District 166 in 2025-26 is Wednesday, May 27, 2026.
When is spring break for Mississippi Valley Community Unit School District 166?
Spring break for Mississippi Valley Community Unit School District 166 is Saturday, March 21, 2026 to Wednesday, March 25, 2026.
When is winter break for Mississippi Valley Community Unit School District 166?
Winter break for Mississippi Valley Community Unit School District 166 is Wednesday, December 24, 2025 to Friday, January 2, 2026.
When do students go back to school after winter break?
Students in Mississippi Valley Community Unit School District 166 return to school after winter break on Monday, January 5, 2026. Winter break ends on Friday, January 2, 2026.
When is Thanksgiving break for Mississippi Valley Community Unit School District 166?
Thanksgiving break for Mississippi Valley Community Unit School District 166 is Thursday, October 16, 2025 to Friday, October 17, 2025.
How do I add Mississippi Valley Community Unit School District 166 calendar to my phone?
Click the "Add to Calendar" button at the top of this page to download the iCal (.ics) file. Then:
iPhone/iPad: Tap the downloaded file, then tap "Add All" to add events to your Calendar app.
Android: Open the file with Google Calendar, review the events, and tap "Import".
Google Calendar (web): Go to Settings → Import & Export → Select the .ics file → Import.
Outlook: Double-click the file or drag it into your Outlook calendar.
Apple Calendar (Mac): Double-click the file or go to File → Import → select the .ics file.
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Other Illinois Districts
Last updated: December 19, 2025
Source: Mississippi Valley Community Unit School District 166 Official Calendar