Stewartstown also won the Ulster Junior Club Football Championship in 2004, beating Cremartin in the final.

In the championship Stewartstown made it to the final against local rivals Killyman St Mary's GAC.

In 2016, the Harps won the Tyrone U-21 G1 Championship for the first time, defeating Coalisland Fianna in the final played at O’Neill Park, Dungannon.

[5] In January 2023, Stewartstown beat Clifden in the All-Ireland semi-final to set up a final date with Fossa.

Fossa won the match by 0–19 to 1–13 in a bad-tempered game which featured six red cards, including four for Stewartstown.

In 2011, the second phase of the Harps' redevelopment plan was completed when a second floodlit pitch was officially opened by GAA President Christy Cooney.