⚠Unofficial calendar. Always confirm with your district before making plans. Some dates are estimated from nearby districts or past years — those are marked below.
CHSD 99
Illinois · 4,775 students · 2026–27 school year
Showing the 2026–27 school year. Past years & forecasts are in our API.
Thanksgiving
Nov 26 – Nov 27
Winter
Dec 18 – Jan 1
Spring
Mar 25 – Apr 2
Last day
May 21
Breaks & no-school days
Day off
Starts
Ends
Teacher Institute - No Student Attendance
—
Teacher Institute - No Student Attendance
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Teacher Institute - No Student Attendance
—
Labor Day - No School
—
Teacher Conferences - No Student Attendance
—
Non-Attendance Day - No School
—
Thanksgiving Break
Winter Break
Teacher Institute - No Student Attendance
—
Martin Luther King'S Birthday - No School
—
Presidents' Day - No School
—
County Institute Day - No Student Attendance
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Spring Break
Teacher Institute - No Student Attendance
—
Memorial Day - No School
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Juneteenth Observance - No School
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School dayDay offHalf dayEstimated — not yet confirmed by the district