Grosseto to Mazara del Vallo trains might be a good value for money solution: travelling in Italy by train is often rather cheap and faster than taking a bus indeed Trains leave from Grosseto and arrive at Mazara del Vallo, Firenze Castello every 30 minutes on average. If travelling with Trenitalia, you need to know the Grosseto to Mazara del Vallo train schedule: the first train leaves at 06:19, while the last ride is at 19:54. A Grosseto to Mazara del Vallo train cost about 17 €. But how long is the train ride from Grosseto to Mazara del Vallo? Your journey takes about 14 hours on average.