The 1926–27 season also saw the club enter a team in the Munster Junior League.

League success initially eluded Rockmount but they did win the Munster Junior Cup in both 1929–30 and 1932–33.

In 1955–56, a junior team was also entered in the Cork Athletic Union League.

[1][2][3][4] Rockmount finished as runners up in the Cork AUL in 1959–60, 1965–66 and 1967–68 before they won the title in 1975–76.

[7] Rockmount have been Munster Senior Cup finalists on four occasions, each time losing out to League of Ireland opponents.

[9] In the quarter-finals of the 2015–16 cup Rockmount drew 1–1 with Cork City before winning the tie 4–3 on penalties.

[10] In the semi-final they defeated Ringmahon Rangers 2–1[11] but then lost the final to Cobh Ramblers by the same score.

In 2003–04 they won the cup for a second time after defeating Bluebell United in the final at Richmond Park.

However, in 2004–05 they failed to retain the cup and lost 1–0 in the final to Wayside Celtic at the Carlisle Grounds.

In 2007–08 Rockmount won the cup for a third time following a 2–0 win at Turners Cross over fellow Munster Senior League club, Douglas Hall.