The Early College calendars outline important deadlines for classes taught at the high schools.
| Teacher Applications Due (AY 2025-26) | Mar. 14, 2025 |
| Student Application Open for Courses at Southern for Spring Classes | Nov. 25, 2024 – Jan. 15, 2025 |
| Student Application Open for Courses at High School for Spring Classes | Nov. 25, 2024 – Feb. 7, 2025 |
| Teacher Roster Verification due for Spring Classes |
Feb. 28, 2025 |
| Teacher Midterm Grades due for Spring Classes | Apr. 11, 2025 |
| Student Early College Withdrawal Deadline for Spring and Full-Year High School Classes | May 16, 2025 |
| Teacher Final Grades due for Spring and Full-Year Classes | Jun. 18, 2025 |
| Student Grade Transcripts Available | Jun. 20, 2025 |
| Student Application Open for courses at Southern or high schools | May 19 - Jun. 27, 2025 |
| First day of classes at high schools | Jul. 8, 2025 |
| Teacher Roster Verification | Jul. 15, 2025 |
| Teacher Midterm Grades due | Jul. 28, 2025 |
| Student Course Withdrawal deadline for classes at high schools | Aug. 18, 2025 |
| Last day of classes at high schools | Aug. 18, 2025 |
| Teacher Final Grades due | Aug. 21, 2025 |
| Student Grade Transcripts available | Aug. 22, 2025 |
| Teacher Applications Due for AY 2025-26 | Mar. 1, 2025 |
| Student Application Open for Fall, Full-Year, and Spring courses at Southern | Aug. 1 - Aug 25, 2025 |
| Student Application Open for Fall, Full-Year, and Spring courses at high schools | Aug. 1 - Sep. 11, 2025 |
| Teacher Roster Verification due for Fall and Full-Year classes | Oct. 2, 2025 |
| Teacher Midterm Grades due for Fall classes | Nov. 10, 2025 |
| Student Course Withdrawal deadline for classes at high schools | Dec. 14, 2025 |
| Teacher Final Grades due for Fall classes | Jan. 30, 2026 |
| Teacher Midterm Grades due for Full-Year classes | Jan. 30, 2026 |
| Student Grade Transcripts available | Feb. 2, 2026 |
| Teacher Applications Due for AY 2025-26 | Mar. 1, 2025 |
| Student Application Open for Spring courses at Southern | Nov. 24, 2025 – Jan. 14, 2026 |
| Student Application Open for Spring courses at high schools | Nov. 24, 2025 – Feb. 6, 2026 |
| Teacher Roster Verification due for Spring classes |
Feb. 27, 2026 |
| Teacher Midterm Grades due for Spring classes | Mar. 31, 2026 |
| Student Course Withdrawal deadline Spring and Full-Year classes at high schools | May 17, 2026 |
| Teacher Final Grades due for Spring and Full-Year classes | Jun. 17, 2026 |
| Student Grade Transcripts available | Jun. 19, 2026 |
Early College students enrolling in courses held at Southern CT State University are required to follow our primary academic calendar for registration and withdrawal dates.