2 May - 30 September Tue-Sun 10:00-17:00, except for 20 and 21 June (midsummer).
23 June-31 July open daily 10:00-17:00.
Guided tours only. Tours in Finnish begin each hour on the hour (the last one at 17:00, in other languages (English, Swedish, German, Russian) on request. Changes are possible on special themedays (for exapmle on 18 July).