The patron of Vallermosa is Saint Lucifer, the bishop Lucifer of Cagliari, celebrated on 20 May, to whom the Chiesa San Lucifero is dedicated; the town's religious feasts also include that of Santa Maria, on 8 September.
The municipality's territory holds the Casteddu de Fanaris, the Nuraghe di Matzanni, the Punta Padenteddu and the Punta di Correxerbu.