The patron saint of Terno d'Isola is Saint Victor, celebrated on 8 May.
For the patronal solemnity, the Solemn Mass is held along with a procession through the town's streets, with the saint's statue carried by eighteen-year-olds. Usually in the third week of June, organised by the Oratorio San Giovanni Bosco with the patronage of the municipality, the Palio di San Donato among the town's districts is run. The town also holds the Madonnina and the Parco dell'Immensa Armonia.