The patron of Terzo d'Aquileia is Saint Blaise, celebrated on 3 February in the Church of San Biagio.
The town's most distinctive event is the Pumpkin Festival, held in the hamlet of San Martino on the Saturday and Sunday of the third week of October. On the last weekend of June, instead, the sagra di San Pieri is held at the Church of San Biagio. The town also holds Palazzo Vianelli.