CU Boulder Academic Calendar 2025‑2026: Important Dates

The CU Boulder Academic Calendar 2025‑2026 is your all‑in‑one roadmap for every critical milestone, from CU Boulder enrollment and registration windows, tuition payment due dates, and course add/drop periods to campus holidays and final exam schedules.

By checking the University of Colorado Boulder academic calendar, Buffs can lock in CU Boulder term dates, navigate the CU Boulder exam schedule, track CU Boulder registration deadlines, and never miss the last day to withdraw without a “W”, ensuring seamless academic and financial planning at CU Boulder.

CU Boulder operates on a traditional semester system enhanced by flexible summer and winter offerings, so whether you’re wondering how long a semester is at CU Boulder, planning around the CU Boulder winter term, or deciding which CU Boulder summer session fits your goals, the calendar has all the dates you need:

• Fall Semester: A 15‑week term (14 instructional weeks + one finals week), kicking off in late August and concluding before the Thanksgiving and winter recesses.
• Spring Semester: Mirrors Fall with 15 weeks of instruction plus finals, beginning after Martin Luther King Jr. Day and wrapping up in early May—with a mid‑semester Spring Break.
• Winter Term: A short, intensive 3‑week session in January for accelerated or makeup coursework, with its own add/drop and exam deadlines.
• Summer Sessions: Three flexible formats…Session A (6 weeks), Session B (6 weeks), and the Full Summer Session (12 weeks)—each with distinct registration, add/drop, and billing deadlines for catching up, getting ahead, or lightening your semester load.

Keep the CU Boulder Academic Calendar 2025‑2026 front and center so you can focus on thriving both in the classroom at Norlin Quad and beyond on the Boulder Flatirons.

CU Boulder Academic Calendar Fall 2025

1. CU Boulder Housing Move-In occurs Friday, August 15, 2026, through Tuesday, August 19, 2026.
2. Fall Welcome runs Friday, August 16, 2026, through Sunday, September 6, 2026.
3. The First Day of Fall Classes is Thursday, August 21, 2026.
4. Labor Day holiday closes campus on Monday, September 1, 2026.
5. Fall Tuition is due Friday, September 5, 2026.
6. Family Weekend takes place Thursday, September 18, 2026, through Sunday, September 21, 2026.
7. Midterm Reading Day is observed on Thursday, October 9, 2026.
8. Homecoming Weekend runs Thursday, October 30, 2026, through Sunday, November 2, 2026.
9. CU Boulder Fall Break occurs Monday, November 24, 2026, through Wednesday, November 26, 2026.
10. Thanksgiving closes campus Thursday, November 27, 2026, through Friday, November 28, 2026.
11. The Last Day of Fall Classes is Friday, December 5, 2026 (campus follows Monday class schedule).
12. End-of-Term Reading Days are Saturday, December 6, 2026, through Sunday, December 7, 2026.
13. Final Examinations run Monday, December 8, 2026, through Friday, December 12, 2026.
14. Fall Degrees are conferred Friday, December 12, 2026 (no ceremony).

CU Boulder Academic Calendar Spring 2026

1. Spring Housing Move-In is Tuesday, January 6, 2026.
2. The First Day of Spring Classes is Thursday, January 8, 2026.
3. Martin Luther King Jr. Day closes campus Monday, January 19, 2026.
4. Spring Tuition is due Thursday, February 5, 2026.
5. Midterm Reading Day is observed on Thursday, February 26, 2026.
6. CU Boulder Spring Break 2026 runs Monday, March 16, 2026, through Friday, March 20, 2026 (campus closed March 20).
7. The Last Day of Spring Classes is Friday, April 24, 2026 (campus follows Monday class schedule).
8. End-of-Term Reading Days are Saturday, April 25, 2026, through Sunday, April 26, 2026.
9. Final Examinations run Monday, April 27, 2026, through Friday, May 1, 2026.
10. The University Commencement Ceremony is held on Saturday, May 2, 2026.
11. Spring Degrees are conferred Saturday, May 2, 2026.

CU Boulder Academic Calendar Summer 2026

1. Summer Housing Move-In dates are to be announced (TBA).
2. The First Day of Classes for Maymester begins Monday, May 4, 2026.
3. Memorial Day closes campus Monday, May 25, 2026.
4. The First Day of Classes for Sessions A, C, and D begins Tuesday, May 26, 2026.
5. The Last Day of Maymester Classes is Thursday, May 21, 2026.
6. Maymester Final Examinations are held on Thursday, May 21, 2026.
7. Juneteenth closes campus Friday, June 19, 2026.
8. The First Day of Classes for Session B begins Tuesday, June 30, 2026.
9. The Last Day of Session A Classes is Friday, June 26, 2026.
10. Session A Final Examinations are held on Friday, June 26, 2026.
11. Independence Day Observed closes campus Friday, July 3, 2026.
12. The Last Day of Session C Classes is Friday, July 17, 2026.
13. Session C Final Examinations are heldon Friday, July 17, 2026.
14. The First Day of Classes for Augmester begins Monday, July 27, 2026.
15. The Last Day of Sessions for B and D Classes is Friday, July 31, 2026.
16. Sessions B and D Final Examinations are held on Friday, July 31, 2026.
17. The Last Day of Augmester Classes is Thursday, August 13, 2026.
18. Augmester Final Examinations are held on Thursday, August 13, 2026.
19. Summer Degrees are conferred Thursday, August 13, 2026 (no ceremony).
20. Summer Tuition Due Dates vary based on registration timing; students should check their billing statements.

For more on the CU Boulder Academic Calendar 2025-2026, visit the University of Colorado Boulder Calendar website.