The G.H. MUMM cellars are open daily on reservation except for 25 December and 1st January and Sundays from November to February:
- high season: from 1st March to 31 October from 9.00 to 11.00 am* and 2.00 to 5.00 pm*,
- low season (November to February): open from Monday to Saturday from 9.00 to 11.00 am* and 2.00 to 5.00 pm*. *beginning of last visit.