Spring 2025
| Registration Opens | December 12, 2024 | Thursday |
| Early Registration Discount Ends | January 22, 2025 | Wednesday |
| Spring Term Begins | February 1, 2025 | Saturday |
| Alumni Project Workshop Registration Deadline / Certificate Application Deadline | February 8, 2025 | Saturday |
| Presidents' Day Holiday | February 17, 2025 | Monday |
| Spring Break | March 17–23, 2025 | Monday–Sunday |
| Spring Term Ends | April 27, 2025 | Sunday |
Summer 2025
| Registration Opens | April 17, 2025 | Thursday |
| Early Registration Discount Ends | May 21, 2025 | Wednesday |
| Summer Term Begins | May 31, 2025 | Tuesday |
| Alumni Project Workshop Registration Deadline / Certificate Application Deadline | June 7, 2025 | Saturday |
| Juneteenth Holiday | June 19, 2025 | Thursday |
| July 4th Break | July 4–6, 2025 | Friday–Sunday |
| Summer Term Ends | August 24, 2025 | Sunday |
Fall 2025
| Registration Opens | August 7, 2025 | Thursday |
| Early Registration Discount Ends | September 10, 2025 | Wednesday |
| Fall Term Begins | September 20, 2025 | Saturday |
| Alumni Project Workshop Registration Deadline / Certificate Application Deadline | September 27, 2025 | Saturday |
| Election Day | November 4, 2025 | Tuesday |
| Thanksgiving Break | November 26–30, 2025 | Wednesday–Sunday |
| Fall Term Ends | December 13, 2025 | Sunday |
Note: Holidays included on this calendar are dates that are no meeting dates for Otis College Extension.