ANSWER
Harvard Library does not close at one single time; closing hours vary by branch and day. On the current hours page, examples range from 7:00pm at Harvard Law School Library to 12:00am at Lamont Library, with Widener Library closing at 8:00pm and HKS Library at 11:00pm on the listed date.
YOUR NEXT DECISION
Turn the answer into your next step
- Pick the exact Harvard library branch you want.
- Open the Harvard Library Locations & Hours page for that date.
- If you’re going late, recheck the hours the same day before leaving.
Which Harvard library closes when?
Harvard Library posts different closing times for each branch, so the right answer depends on which library you mean and the day you’re going. On the hours page shown for Sunday, September 6, 2026, Lamont Library was open until 12:00am, HKS Library until 11:00pm, Widener Library until 8:00pm, Harvard Law School Library until 7:00pm, and Cabot Science Library until 9:00pm.
- Source date: Sunday, September 6, 2026.
- Hours vary by branch, so there isn’t one universal closing time.
- Check the live hours page before you go in case the schedule changes.
Best next check
Use Harvard Library’s live hours page to confirm the exact branch and date you need, since the university’s library system updates hours by location. The main Harvard Library site links directly to the Locations & Hours page.
- Confirm the specific library branch, not just “Harvard Library” generally.
- If you’re heading out late, verify the hours the same day.
- The official Harvard Library site is the safest source for current hours.
Sources
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