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.

Regular hours
Monday - Thursday 8 am to 11 pm
Friday 8 am to 8 pm
Saturday 10 am to 11 pm
Sunday Noon to 11 pm

 

Summer hours
 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