All Heights Libraries branches are closed the following days:
| Holiday | Closed on: |
| New Year’s Day | First day of January |
| Martin Luther King, Jr. Day | Third Monday of January |
| Easter Sunday | Differs each year |
| Memorial Day | Last Monday of May |
| Juneteenth | Nineteenth of June |
| Independence Day | Fourth day of July |
| Labor Day | First Monday of September |
| Thanksgiving Day | Fourth Thursday of November |
| Friday after Thanksgiving | Friday after Thanksgiving |
| Christmas Eve Day | Twenty-fourth day of December |
| Christmas Day | Twenty-fifth day of December |
In addition:
The Library will close at 5:30 p.m. on New Year’s Eve and the day before Thanksgiving, unless they fall on a Sunday, when the library closes at 5 p.m.
If a holiday on which the Library is closed falls on Sunday, the Library will be closed on Sunday and Monday, with Monday being recognized as the holiday.