After a long tradition of playing in Serie C, in recent years, following the historic promotion which took place in the 2005–06 season, the club participated in five consecutive seasons in Serie B, becoming, after the two teams in Rome, the third most notable team of the region of Lazio. In its history Frosinone have won at a national level, two championships of Serie C2 (1986–87 and 2003–04) and two of Serie D (1965–66 and 1970–71). On 16 May 2015, the "Ciociari", with a 3–1 win over Crotone, secured their first, historic promotion to Serie A.