This page summarizes the patterns in place in LibCal for Library Hours as approved in November 2021 by LAT, with subsequent updates. (Service calendars are on a separate page.)
Default Academic Semesters
| Day of the Week | Mon to Thurs | Fri | Sat | Sun |
| Firestone | 8 am to 2 am | 8 am to 11 pm | 11 am to 11 pm | 11 am to 2 am |
| Lewis & Engineering | 8:30 am to 12 am | 8:30 am to 9 pm | 11 am to 9 pm | 11 am to 12 am |
| SCF & SCMarquand & SCM | 9 am to 4:45 pm | 9 am to 4:45 pm | Closed | Closed |
| Stokes, Mendel, EAL, Architecture | 8:30 am to 12 am | 8:30 am to 9 pm | 11 am to 9 pm | 11 am to 12 am |
Fall and Spring Breaks
| Day of the Week | Mon to Thurs | Fri | Sat | 1st Sun | 2nd Sun |
| Firestone | 8 am to 11 pm | 8 am to 9 pm | 11 am to 9 pm | 11 am to 9 pm | 11 am to 2 am |
| Lewis & Engineering | 8:30 am to 9 pm | 8:30 am to 9 pm | 11 am to 9 pm | 11 am to 9 pm | 11 am to 12 am |
| SCF & SCMarquand & SCM | 9 am to 4:45 pm | 9 am to 4:45 pm | Closed | Closed | Closed |
| Stokes | 9 am to 5 pm | 9 am to 5 pm | 1 to 5 pm | 1 to 5 pm | 1 to 5 pm |
| Mendel, EAL, Architecture | 9 am to 5 pm | 9 am to 5 pm | Closed | Closed | Closed |
Reading Days and Finals
| Day of the Week | Mon to Thurs | Fri | Sat | Sun |
| Firestone | 8 am to 2 am | 8 am to 11 pm | 11 am to 11 pm | 11 am to 2 am |
| Lewis & Engineering | 8:30 am to 12 am | 8:30 am to 9 pm | 11 am to 9 pm | 11 am to 12 am |
| SCF & SCMarquand & SCM | 9 am to 4:45 pm | 9 am to 4:45 pm | Closed | Closed |
| Stokes, Mendel | 8:30am - 12am | 8:30 am to 9 pm | 11 am to 9 pm | 11 am to 12 am |
| EAL, Architecture | 8:30am - 12am | 8:30 am to 9 pm | 11 am to 9 pm | 1 pm to 12 am |
Extended End of Term Hours
Firestone stays open till 2 am on the Friday and Saturday nights before Dean's Date each semester.
| Day of the Week | Fri | Sat |
| Firestone | 8 am to 2 am | 11 am to 2 am |
Holiday Schedules
Labor Day and Thanksgiving
| Day of the Week | Mon | Wed | Thurs | Fri | Sat | Sun |
| Firestone | 1 pm to 5 pm | 8 am to 5 pm | Closed | Closed | 11 am to 7 pm | 11 am to 2 am |
| Lewis & Engineering | 1 pm to 5 pm | 8:30 am to 3 pm | Closed | Closed | 1 pm to 5 pm | 11 am to 12 am |
| SCF & SCMarquand & SCM | Closed | 9 am to 4:45 pm | Closed | Closed | Closed | Closed |
| Stokes, Mendel, EAL, Architecture | Closed | 8:30 am to 3 pm | Closed | Closed | Closed | 11 am to 12 am |
Staff Holidays outside semesters Including MLK Day, Memorial Day, July 4, Juneteenth, Christmas Eve, Christmas Day, New Year's Eve and New Years Day: All Library locations are closed.
Winter Break
End of fall classes to start of Wintersession, excluding all staff holidays set by the University.
| Day of the Week | Mon - Thurs | Fri | Sat & Sun |
| Firestone | 9 am to 9 pm | 9 am to 7 pm | 11 am to 7 pm |
| Lewis & Engineering | 9 am to 5 pm | 9 am to 5 pm | Closed |
| SCF & SCMarquand & SCM | 9 am to 4:45 pm | 9 am to 4:45 pm | Closed |
| Stokes, Mendel, EAL, Architecture | 9 am to 5 pm | 9 am to 5 pm | Closed |
WinterSession
| Day of the Week | Mon - Fri | Fri | Sat & Sun |
| Firestone | 9 am to 9 pm | 9 am to 7 pm | 11 am to 7 pm |
| Lewis & Engineering | 9 am to 9 pm | 9 am to 9 pm | 9 am to 9 pm |
| SCF & SCMarquand & SCM | 9 am to 4:45 pm | 9 am to 4:45 pm | Closed |
| Stokes, Mendel, EAL, Architecture | 9 am to 5 pm | 9 am to 5 pm | Closed |
Summer, Commencement and Reunions
| Day of the Week | Mon to Thurs | Fri | Sat & Sun |
| Firestone | 9 am to 9 pm | 9 am to 7 pm | 11 am to 7 pm |
| Lewis & Engineering | 9 am to 9 pm | 9 am to 5 pm | Closed |
| SCF & SCMarquand & SCM | 9 am to 4:15 pm | 9 am to 4:15 pm | Closed |
| Stokes | 9 am to 8 pm | 9 am to 5 pm | 1 to 5 pm |
| Mendel, EAL, Architecture | 9 am to 5 pm | 9 am to 5 pm | Closed |