| JANUARY 2025 |
| Monday, January 6 | School Resumes
|
| Monday, January 13 | School Closed/Coming of Age Day |
| FEBRUARY 2025 |
| Tuesday, February 11 | PTM-on-Demand |
| Tuesday, February 11 | School Closed/Nat'l Foundation Day |
| Monday, February 24 | School Closed/Emperor's Birthday |
| Thursday, February 27 | Science Fair MS and HS |
| MARCH 2025 |
| March 12-24 | Final Exams Grades 9 and 11 |
| March 14-24 | Final Exams Grades 1-8 |
| Thursday, March 20 | School Closed/Vernal Equinox |
| March 25-28 | Spring Break for Students |
| Saturday, March 29 | Graduation Tokyo Grades 10 and 12 |
| Sunday, March 30 | Graduation KG, Grades 5 and 8 |
| APRIL 2025 |
| Tuesday, April 1 | New School Year Starts for Teachers
|
| Wednesday, April 2 | New School Year Starts for Students |
| Tuesday, April 29 | School Closed/Showa Day |
| MAY 2025 |
| May 3-6 | School Closed/Golden Week |
| May 10-11 | Tokyo Sports Day Grades 1 and Up |
| Saturday, May 17 | Yokohama Sports Day |
| JUNE 2025 |
| June 16-23 | 1st Term Exams Grades 1-10 and 12 |
| Wednesday, June 18 | Kindergarten Open House |
| JULY 2025 |
| Friday, July 11 | Students Dismissed 2 Hours Early |
| Monday, July 14 | Summer Vacation Starts |
| Monday, July 14 | Summer School Starts |
| AUGUST 2025 |
| Wednesday, August 13 | Summer School Ends |
| Monday, August 25 | School Resumes |
| Saturday, August 30 | IISJ College Fair |
| SEPTEMBER 2025 |
| Monday, September 15 | School Closed/Respect for the Aged Day |
| Tuesday, September 23 | School Closed/Autumnal Equinox |
| September 16-26 | 1st Term Exams Grade 11 |
| OCTOBER 2025 |
| Monday, October 13 | School Closed/Nat'l Sports Day |
| October 22-31 | 2nd Term Exams Grades 1-10, 12 |
| Thursday, October 23 | Tokyo PTM Kindergarten |
| Tuesday, October 28 | Yokohama PTM Kindergarten |
| Thursday, October 30 | Tokyo Sports Day Kindergarten |
| NOVEMBER 2025 |
| Monday, November 3 | School Closed/Culture Day |
| November 8-9 | Tokyo PTM Grades 1-8 |
| Saturday, November 15 | Yokohama PTM |
| Saturday, November 22 | Tokyo PTM Grades 9-12 |
| Monday, November 24 | School Closed/Labor Thanksgiving Day |
| DECEMBER 2025 |
| Saturday, December 6 | Yokohama Winter Concert |
| December 13-14 | Tokyo Winter Concert |
| Wednesday, December 17 | Yokohama Science Fair Grades 6-9 |
| Thursday, December 18 | Tokyo Science Fair Grades 7-9 and 11 |
| Friday, December 19 | Students Dismissed 2 Hours Early |
| Monday, December 22 | Winter Vacation Begins |
| JANUARY 2026 |
| Monday, January 5 | School Resumes |
| Monday, January 5 | Pre-Board Exams Begin Grades 10 and 12 |
| January 5-9 | 2nd Term Exams Grade 11 |
| Monday, January 12 | School Closed/Coming of Age Day |
| January 21-30 | Board Practicals |
| Monday, January 26 | School Closed/Republic Day of India |
| Saturday, January 31 | PTM-on-Demand |
| FEBRUARY 2026 |
| Wednesday, February 11 | School Closed/Nat'l Foundation Day |
| Monday, February 23 | School Closed/Emperor's Birthday |
| MARCH 2026 |
| March 9-25 | Final Exams Grades 1-9 and 11 |
| Friday, March 20 | School Closed/Vernal Equinox |
| Saturday, March 21 | Yokohama Graduation |
| Tuesday, March 24 | Tokyo Kindergarten Graduation |
| Wednesday, March 25 | Yokohama Kindergarten Graduation |
| March 26-April 1 | Spring Break for Students |
| March 28-29 | Tokyo Graduation |
