The patrons of Grosso are Saint Lawrence the Martyr, Saint Stephen and Saint Joseph, and the feast is listed on 19 March, the day of Saint Joseph; the Chiesa dei Santi Lorenzo e Stefano is dedicated to Saints Lawrence and Stephen.
The municipality in the province of Turin also holds the Chiesa della Santa Sindone, Palazzo Armano, the Cappella di San Rocco and the church of San Ferreolo.
