The library is closed on Sundays and Austrian public holidays.
Austrian public holidays are: 1 January, 6 January, Easter Monday, 1 May, Ascension Day, Whit Monday, Corpus Christi, 15 August, 26 October, 1 November, 8 December, 25 December and 26 December.
Regular opening hours apply during the semester break. Only the reading room for old and valuable books closes earlier at 5pm.
The library is closed from Good Friday to Easter Monday.
The library is closed from Saturday to Whit Monday.
Special opening hours apply during the summer holidays. The main library is usually closed for one week in August to allow for maintenance work.
The library is closed from 22 December to 26 December, on 31 December, 1 January and 6 January. Between 27 December and 30 December all library departments have reduced opening hours. Regular services resume on 2 January.