The library is currently open during the Regular Hours schedule. The Columbia University Libraries has a calendar view and hours for other libraries such as Barnard and the Digital Humanities Center.
| Monday - Thursday | 8 am to 11 pm |
| Friday | 8 am to 8 pm |
| Saturday | 10 am to 11 pm |
| Sunday | Noon to 11 pm |
| Monday - Thursday | 8 am to 8 pm |
| Friday | 8 am to 6 pm |
| Saturday | 10 am to 6 pm |
| Sunday | Noon to 8 pm |
1 hour before closing time the stacks close.
15 minutes before closing time the Circulation Desk closes. Please complete all circulation transactions before that time.
5 minutes before closing time library patrons should pick up belongings and move to the lobby. Doors close promptly at stated closing time.
Reference Desk
Regular hours: Monday - Friday, 11am to 5pm.
Summer hours: Monday - Friday, 12pm to 4pm.
Interlibrary Loan (ILL)
Monday - Friday, 9am to 5pm.
Archives & Special Collections
Monday - Friday, 9:15am to 4:45pm, by appointment only. Telephone and email reference is available Monday - Friday, 9am to 5pm. Please contact the Archives & Special Collections at hslarchives@columbia.edu for more information