⚠Unofficial calendar. Always confirm with your district before making plans. Some dates are estimated from nearby districts or past years — those are marked below.
Mundelein Cons HSD 120
Illinois · 2,261 students · 2026–27 school year
Showing the 2026–27 school year. Past years & forecasts are in our API.
Winter
Dec 21 – Dec 21
Spring
Mar 22 – Mar 26
Last day
Jun 9
Breaks & no-school days
Day off
Starts
Ends
Full Day Professional Development (Starts Mon-Wed)
—
Full Day Professional Development (Continues Mon-Wed)
—
Full Day Professional Development (Ends Mon-Wed)
—
Clerical Days (Starts Thurs-Fri)
—
Clerical Days (Ends Thurs-Fri)
—
Labor Day - Holiday
—
1/2 Professional Development - 1/2 Day Clerical
—
Statewide Inservice - Non-Contract
—
1/2 Professional Development - 1/2 Day Clerical
—
Veterans Day - Holiday
—
No School - Trade Day For Evening Conferences
—
Thanksgiving - Non-Contract
—
No School - Non-Contract
—
Winter Break
—
Winter Break - Non-Contract
—
Martin Luther King Day - Holiday
—
No School - Clerical Day
—
1/2 Professional Development - 1/2 Day Clerical
—
President'S Day - Non-Contract
—
Spring Break
1/2 Professional Development - 1/2 Day Clerical
—
No School - Conference Outreach And Teacher Collaboration
—
Memorial Day - Holiday
—
No School 9Th - 12Th Grade - Gphs Graduation
—
Clerical Day - Teacher Checkout
—
Juneteenth - Holiday
—
School dayDay offHalf dayEstimated — not yet confirmed by the district