The patrons of Smerillo are Saints Peter and Paul, celebrated on 29 June; the municipality holds the Chiesa dei Santi Pietro e Paolo.
The festival «Le Parole della Montagna» is usually held in July; it reached its twelfth edition in 2023 and takes the mountain as its starting point, speaking of heroic climbs and symbolic language. The municipality also holds the Rocca di Smerillo, the Chiesa di San Vincenzo Ferreri, the Chiesa di San Pietro martire and the Chiesa di San Nicola.