In 1958, U.S. Frosinone was founded, competing in both the Seconda Categoria and Promozione championships. Football returned to Frosinone in 1963 when president Cristofari together with Dante Spaziani and Augusto Orsini, announced the formation of Sporting Club Frosinone. In Serie D, Frosinone always finished among the top positions, and in 1966 won promotion to Serie C after an encounter with Latina. The following year, the canarini were relegated back to Serie D, where in 1967–68 they came third, then fifth and second. The leading figures at the club during this period were the Stirpe brothers, coaches De Angelis and Rambone and players Benvenuto, Caputi, Da Col, Del Sette, Fumagalli and Trentini.