The patron of Rosate is Saint Stephen, celebrated on 26 December in the Chiesa prepositurale di Santo Stefano. The cult dates back to the ancient pieve of Rosate, of which the saint was already patron, and his feast is still celebrated on this date today.
Saint Stephen is also celebrated on the last Sunday of May. The town also holds the Mulino delle Umiliate and the Convento delle Umiliate.