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Frosinone Calcio ( Italian pronunciation: [froziˈnoːne] ⓘ ) is a professional football club based in Frosinone , Lazio , Italy. The club was founded on 5 March 1906 under the name Unione Sportiva Frusinate , [ 2 ] but conventionally the year 1928 is indicated as the beginning of competitive activities of significant importance. Following cancellation by the Italian Football Federation , it was refounded in 1959 and in 1990. In the 2014–15 season the club played in Serie B for the sixth time in its history. The club earned its first promotion to the top flight Serie A in the 2015–16 season , but were relegated back down to Serie B after just one season. In the 2018–19 season it was promoted to Serie A for a second time. After winning the Serie B championship in the 2022–23 season they were promoted to Serie A for a third time.