The final round of the Bayleys Southern Districts' Premier competition threw up a couple of upsets and confirmed the semifinalists.
Old Boys Marist (OBM) will take on Wellsford, while Mid Northern come up against Waipu next week.
Wellsford locked in fourth position with a 43-19 win over Kamo, rendering Otamatea's game ultimately pointless in the playoff race.
Otamatea could have qualified if Wellsford lost and they won, but neither of those results occurred.
Hora Hora gave their home faithful something to savour as they beat Otamatea 22-17 in an absorbing contest.