2025-2026 School Calendar August 2025 (8 days) Sun
Mon
Tue
Wed
Thur
August 2025 Fri
Sat
1
2
12 HM The Queen's Mother's Birthday
3
4
5
6
7
8
9
20 First Day of Academic Year
10
11
12
13
14
15
16
28-30 G12 University Applications Trip
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Regular School Days
Mon
Tue
Wed
Thur
1
2
3
4
8
9
10
11
Fri
11-13 Grade 9 Bonding Trip
5
6
18/25 EY/PY (18) and MYP/DP (25) Wai Kru Ceremony
12
13
15
16
17
18
19
20
22
23
24
25
26
27
28
29
30
Regular School Days
October 2025 3-5
3 Professional Day for Teachers 3-5 IBO Scheduled Workshops held @Concordian
October 2025 (16 days) Mon
Tue
30-1 Grade 8 Bonding Trip
Wed
Thur
Fri
Sat
1
2
3
4 11
Regular School Days
31 End of First Quarter
Fri
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
Sun
Mon
Tue
Wed
Thur
Fri
Sat
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
Sun
Mon
Sat
14
15
16
17
18
3/4 Half Day / Full Day Whole School Parent-Teacher Conferences (PTC)
19
20
21
22
23
24
25
26
27
28
29
30
Sun
Mon
Fri
Sat
1
2
14
15
16
17
18
5 Loy Krathong (Whole School)
21
22
23
24
25
12 25th Anniversary Celebrations
26
27
28
29
30
31 17-21/28
November 2025 (19 days)
G5 (19-21), G6 (18-21), G7-8 (17-21) - WWW G9 (17-28) - China Exchange Trip G10 / G11 (17-21) - WWW / School Build G12 (17-21) - Focus Week
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Regular School Days
May 2026 (20 days) PK-G4 Regular Days G12
24 School Holiday
1 9
December 2025 5/15-2 Father's Day / Winter Break
School Holidays
January 2026 12/23 @SA Semester 2 starts / End of 1st Semester
Regular School Day
Tue
Wed
Thur
Sat
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
April 2026 3 End of Third Quarter 8
Afternoon PTC (specific students by teacher's request) & MYP Student-Led Conferences
Regular School Days
10/13-17 Substition Chakri Day / Songkran Break
Wed
5
6
7
8
9
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Sat
31 June 2026 (14 days) Mon
Tue
Wed
Thur
Fri
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
Sun
Mon
Tue
Sat
School Holiday
May 2026
January 2026 (20 days) Tue
4 11
School Holiday
July 2026 (0 day)
4 / 23 Coronation Day / Senior Valedictory Ceremony Mon
Thur
3
Sun
3 Makha Bucha Day / PD Day for Teachers Fri
Wed
10
School Holiday March 2026
Mon
Tue
February 2026 16-20 Chinese New Year Break
December 2025 (9 days)
4 11
13
13
2
3
12
20
Sat
Fri
2
November 2025
19
Fri
Thur
1
10
12
Thur
Wed
9
10
Wed
Tue
8
9
Tue
April 2026 (16 days)
7
8
Mon
Sat
6
7
Sun
Thur
3
5
6
Sun
Wed
2
School Holidays
13-17 October Break 23 Chulalongkorn Day
Sun
Tue
1
March 2026 (21 days)
Sat
21
5
Mon
4-6 Grade 11 DP Retreat / Grade 10 Bonding Trip
15-19 MYP/DP Back to School Week
14
Sun
Sun
8 @SA Semester 1 starts September 2025 (22 days)
7
School Holidays
September 2025
8-12 EY/PY Back to School Week Sun
February 2026 (15 days)
11/14 First Day for New Faculty / Returning Faculty
School Holiday
June 2026
Thur
Fri
Sat
3 HM The Queen's Birthday
1
2
3
12 EY/PY Student Led Conferences
4
5
6
7
8
9
10
15-16 G11 Career Prep Days
11
12
13
14
15
16
17
17 K3/G5 Graduations
18
19
20
21
22
23
24
25
26
27
28
29
30
31
School Holiday
Regular School Days
Wed
Thur
Fri
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
19 Last Day of the Academic Year 22-10 Summer School
Updated: June 1, 2025
Events for students, regular day or half day
Beginning School Year / End Quarter, Semester, School Year
Back to School Night / Week
Events for all students
School Holiday: No School for Students & Teachers
G5-10 Week Without Walls / G11 School Build
Professional Day: No school
Summer School
Please call 02-034-9000 ext. 211, 212 to schedule an appointment for a School Tour or Admissions Inquiry.
Student Contact Days: 180