Grade 9 Orientation
2025-08-27 - 2025-08-28

First Day of School
2025-09-02

Final Day for Course Enrollment
2025-09-12

Middle School Retreat
2025-09-25

No Classes - Faculty Professional Development
2025-09-26

Senior Retreat
2025-10-02 - 2025-10-03

No Classes- Indigenous Peoples' Day
2025-10-13

Open House
2025-10-25 12:00 - 14:00 (America/New_York) | Cathedral High School, 74 Union Park Street, Boston, MA, 02118, United States
Get to know Cathedral High School at our annual Open House on Saturday, October 25!
At Open House, you will discover all the opportunities Cathedral has to offer!

Meet current Cathedral scholars and hear about their experiences as Panthers.
Engage with faculty and staff.
Tour our historic South End campus, including our new Applied Learning Center and 13,000-foot gymnasium.
Speak with our Finance office to discover how Cathedral is affordable for your family.
Ask questions to Admissions representatives and learn how to apply.
… and more!

REGISTER HERE

AASF Gala & Centennial Celebration
2025-10-30 18:00 - 21:00
Join us on October 30th to celebrate Cathedral’s Centennial!
Learn more and purchase tickets here.

No Classes- Faculty Professional Development
2025-11-10

No Classes- Veterans Day
2025-11-11

No Classes- Thanksgiving Break
2025-11-26 - 2025-11-28

No Classes- Christmas Break
2025-12-22 - 2026-01-02

End of Quarter 2
2026-01-16

No Classes- MLK Jr. Day
2026-01-19

Course Registration for 2026-27 Academic Year
2026-03-12

Grade 10 Retreat
2026-03-12

Centennial Alumni Breakfast
2026-03-12 08:30 - 10:30

Cathedral Day
2026-03-19
Cathedral Day is the single biggest fundraising day for the Cathedral Fund!
We look forward to making our Centennial Cathedral Day the most impactful one yet!
Learn more.
Give now.

Career Day
2026-04-02

No Classes- Good Friday
2026-04-03

Hall of Fame
2026-04-14
Date: April 14, 2026
Time: 5:30 PM
Location: Cathedral High School, Boston
Learn more and purchase tickets here.
With questions, contact Sam Everett at severett@cathedralboston.org.

No Classes- Spring Break
2026-04-20 - 2026-04-24

Golden Diploma - Class of 1976
2026-05-02
Purchase tickets here.
Date: Saturday, May 2, 2026
Time: 10:00 AM
Location: Cathedral High School, Boston
Questions? Contact mmurphy@cathedralboston.org

AP Exams
2026-05-04 - 2026-05-15

Senior Week
2026-05-18 - 2026-05-22

Presidents Society Reception
2026-05-19
Learn more here.

No Classes- Memorial Day
2026-05-25

Baccalaureate Mass
2026-05-28

Graduation
2026-05-30
