From the motorway Sterzing exit towards Ridnauntal: parking is available on the large car park in Mareit village.
From Meran via the Jaufenpass follow directions towards Ridnaun to Mareit.
From Mareit a 5-minute walk by footpath leads to the castle entrance (path not wheelchair accessible). Phone number for those with walking difficulties or for wheelchair users: (+39) 0472 758 121.
By public transport:
Bus line 312 (Ridnaun/Ratschings) to Mareit. See here for timetables.