The Herzog Anton Ulrich-Museum und Dankwarderode castle are open on the following holidays:
- Good Friday
- Easter Sunday
- Easter Monday
- Whitsunday
- German Unity Day (October 3)
- Reformation Day (October 31)
- Boxing Day (December 26)
Both locations are closed on the following holidays:
- New Year's Day (January 1)
- Labor Day (May 1)
- Ascension Day
- Whit Monday
- Christmas Eve (December 24)
- Christmas Day (December 25)
- New Year's Eve (December 31)
