The patron of Castel del Piano is Mary Most Holy of Grace, celebrated on 8 September in the Church of Santa Maria delle Grazie.
The same day brings the Palio delle Contrade, in the distinctive shell-shaped circuit of Piazza Garibaldi. According to legend, the palio was born precisely in honour of the Madonna delle Grazie, whose icon was found. The town also holds the Palazzo Nerucci and the Teatro Amiatino.