The patron saint of Fossombrone is Saint Aldebrando, celebrated on 1 May in the Church of Sant'Aldebrando.
On the second Sunday of May, the «Trionfo del Carnevale», or Historic Carnival, is held, a Renaissance historical reenactment set in 1559: it is the day of the Cursa all'Anello, the race that concludes the Palio del Cardinale. The town also holds the Concathedral of Fossombrone and the Fortress of Fossombrone.