The patron saint of Castel di Iudica is Our Lady of Grace, celebrated on the second Sunday of August.
The municipality, part of the Calatino district, takes its name from the castle that stood on Monte Iudica: under Arab rule, a town called Zotica stood on the site, described by the geographer al-Idrisi as a flourishing agricultural settlement in the early 12th century, and conquered by the Normans around 1076 according to the account of the chronicler Geoffrey Malaterra, who then donated it to the city of Caltagirone. The town became an independent municipality only in 1934, taking the name of the ancient castle.
On Monte Iudica traces of an archaic settlement dating from the 8th to the 3rd century BC have been found, while on the nearby Monte Turcisi the remains of a phrourion, an ancient Greek garrison fort, are preserved. The municipality also includes the hamlets of Carrubo, Cinquegrana, Franchetto and Giumarra.
