SchoolDates
Read from the district on October 8, 2026

Center Cass School District 66 school calendar, 2026–2027

Key dates for 2026–2027: first day of school August 19; Thanksgiving break November 23–27; winter break December 21 to January 4; spring break March 26 to April 2; last day of school June 1.

Next time off Oct 12 No school · October 12–13 As of October 8, 2026, the day this calendar was read
School days off this year 30 across 9 separate closures
Last day of school June 1 Tuesday
First day of school August 19; Thanksgiving break November 23–27; Winter break December 21 to January 4; Spring break March 26 to April 2; Last day of school June 1;
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Month by month

Days off: school breaks and holidays. Not days off: early releases and term milestones.

August 2026

SMTWTFS
26
27
28
29
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
3
4
5
  • 19First day

September 2026

SMTWTFS
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
  • 7Labor Day
  • 25Early release

October 2026

SMTWTFS
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
  • 12–13No school
  • 30Early release

November 2026

SMTWTFS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
  • 23–27Thanksgiving break

December 2026

SMTWTFS
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
  • 21 onWinter break

January 2027

SMTWTFS
27
28
29
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
3
4
5
6
  • to 4Winter break
  • 18MLK Day

February 2027

SMTWTFS
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
  • 11Early release
  • 12No school
  • 15Presidents Day
  • 26No school

March 2027

SMTWTFS
28
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
3
  • 15Early release
  • 26 onSpring break

April 2027

SMTWTFS
28
29
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
  • to 2Spring break
  • 19Early release

May 2027

SMTWTFS
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
3
4
5
  • 7Early release
  • 31Memorial Day

June 2027

SMTWTFS
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
  • 1Last day
School break Holiday, no school Early release Term milestone

Key dates

Key dates · 2026–2027
WhatDatesSchool daysBack to schoolSame dates in Illinois
First day of schoolAugust 19——8 of 34 · Illinois first day of school 2026, by district
Thanksgiving breakNovember 23–275Monday, November 308 of 38 · Illinois Thanksgiving break 2026, by district
Winter breakDecember 21 to January 411Tuesday, January 517 of 38 · Illinois winter break 2026–27, by district
Spring breakMarch 26 to April 26Monday, April 514 of 40 · Illinois spring break 2027, by district
Last day of schoolJune 1——1 of 33 · Illinois last day of school 2027, by district
Longest closure
Winter break, December 21 to January 4 (11 school days)
One-day closures
4
Closures starting Tuesday to Thursday
0
Staff days, no students
none published
Early-release days
6: Sep 25, Oct 30, Feb 11, Mar 15, Apr 19, May 7
Most days off in one month
December, 9 school days
Months with no day off
August and June
Longest run of school days
40, April 5 to May 28

Every date

Every published date · Center Cass School District 66 · 2026–2027
DateWhat it isTime offDistrict’s own wording
August 19First day of school—First Day of School - Early Dismissal
September 7Labor Day1 school dayNo School - Holiday
September 25Early release—Early Dismissal
October 12–13No school2 school daysNo School - Holiday; Oct 13: No School
October 30Early release—Early Dismissal
November 23–27Thanksgiving break5 school daysFall Break - No School
December 21 to January 4Winter break11 school daysWinter Break - No School; Jan 4: Teacher Institute Day - No School
January 18Martin Luther King Jr. Day1 school dayNo School - Holiday
February 11Early release—Early Dismissal
February 12No school1 school dayNo School
February 15Presidents Day1 school dayNo School - Holiday
February 26No school1 school dayCounty Institute Day - No School
March 15Early release—Early Dismissal
March 26 to April 2Spring break6 school daysSpring Break - No School
April 19Early release—Early Dismissal
May 7Early release—Early Dismissal
May 31Memorial Day1 school dayNo School - Holiday
June 1Last day of school—Last Day of School - Early Dismissal

Sources

  1. District’s calendar: https://www.ccsd66.org/events (the source)
  2. District website: https://www.ccsd66.org
  3. Calendar feed read on October 8, 2026: https://thrillshare-cmsv2.services.thrillshare.com/api/v4/o/6082/cms/events

How these dates are read and labeled: Methodology.

Other Illinois districts

Tri-Valley Community Unit School District 3: 30 school days off Beach Park Community Consolidated School District 3: 29 school days off Brookwood School District 167: 31 school days off Community Consolidated School District 89: 31 school days off