Fall 2025 Main Campus Academic Dates & Deadlines
We sent this email at 7 p.m. on Monday, Aug. 18, 2025, to Main Campus, degree-seeking undergraduate and graduate students who were either enrolled in Fall 2025 classes or were eligible to enroll.
Law students should refer to the Colorado Law calendar.
Dear [first],
Welcome to the 2025–26 academic year at CU Boulder! Please keep in mind the following key dates. Deadlines occur at 11:59 p.m. Mountain Time unless otherwise noted.
These dates apply to Main Campus classes that follow the full-semester start and end dates (Aug. 21–Dec. 5, 2025). For other calendars, see our academic calendar webpage.*
Please note CU Boulder’s new academic calendar takes effect Fall 2025. For more information, see the revised academic calendar.
Friday, Aug. 22
- Last day to enroll in or waive student health insurance coverage.
Friday, Aug. 29
- Last day to add a class, swap a class or join a waitlist for a closed class.
- Last day to be automatically enrolled from a waitlist.
Monday, Sept. 1
- Labor Day holiday (no classes; university closed)
Thursday, Sept. 4
- Last day to enroll in a 4-payment plan.
Friday, Sept. 5
- Last day to pay your tuition & fee bill.
- Last day to drop a class without penalty.
- Last day to change variable credit hours & no-credit status.
Monday, Sept. 8
- Waitlists are canceled. Students still on the waitlist lose access to that class's online materials, but may be eligible to reserve a seat in the course the next time it's offered.
Thursday, Oct. 9
- Midsemester reading day (no classes).
Tuesday, Oct. 28
- Last day for class withdrawal; W notations will apply.
- Last day to change pass/fail grade mode.
Monday, Nov. 24–Friday, Nov. 28
- Fall break (no classes; university closed Nov. 27 & 28).
Friday, Dec. 5
- Last day of classes.
- Classes follow a Monday schedule.
- Last day to withdraw from the semester.
Saturday, Dec. 6–Sunday, Dec. 7
- End of term reading days (no classes or exams).
Monday, Dec. 8–Friday, Dec. 12
* If you’re enrolled in any class that doesn’t meet for the full semester, it’s a special session class. Special session classes follow different deadlines than full-semester classes (view the special session calendar). To check the session and view key dates for one of your classes, go to the Your Classes card in Buff Portal. Select a class to view session information and the “Drop/Swap/Edit This Class” button for related deadlines.
Office of the Registrar | University of Colorado Boulder
303-492-6970 | registrar@colorado.edu