⚠Unofficial calendar. Always confirm with your district before making plans. Some dates are estimated from nearby districts or past years — those are marked below.
Sullivan CUSD 300
Illinois · 1,179 students · 2026–27 school year
Showing the 2026–27 school year. Past years & forecasts are in our API.
Last day
May 20
Breaks & no-school days
Day off
Starts
Ends
Pd Day; No School For Students - Election Day
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Labor Day; School Closed For Staff & Students
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Parent-Teacher Conferences; No School For Students
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In-Service Day; No School For Students - Election Day
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Administrative Day; No School For Students
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Holiday; No School For Staff & Students
—
Staff Development Day; No School For Students
—
Good Friday
—
In-Service Day; No School For Students - Election Day
—
Administrative Day For Staff
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School dayDay offHalf dayEstimated — not yet confirmed by the district