Collegiate defeated Taranaki rival Francis Douglas Memorial College 26-22 at home on August 6, and then pulled away from St Peter's Cambridge in Taupō to win the Plate, 38-25.
"The boys maybe played the best rugby of their season," said coach Steve Simpson of the last game, where his team scored six tries after leading by one point at halftime.
"We were hoping to get the Top 4, but had two four-point losses away."
After a preseason that saw them play games in the likes of Oamaru, New Plymouth and Palmerston North, Collegiate had a rough start to their campaign with a 46-3 away loss to eventual finalists St John's Hamilton.
They recovered to rattle off four straight wins across the rest of May and early June, beating St Peter's (26-19), St John's Hastings (34-10), Francis Douglas (15-12) and Rathkeale College (38-8).
However, momentum stalled with two games in mid-June that just went against them, beaten by Lindisfarne (14-10) and semifinal-bound Wesley College (7-3) in results which were there for the taking.
Pausing their CNI campaign to host the 96th Annual Quadrangular, where they lost to Christ's College 47-33 but defeated Wellington College 15-13, Collegiate resumed in July with two tough home games to try to hang onto their semifinal spot.
They just could not pin down seven-time CNI champions St Paul's Collegiate, losing 20-10, before facing a red-hot Feilding High, who won 36-12 on their way to comfortably beating Wesley and St John's to claim the title.
Due to injury, Collegiate did not have the services of their influential front rower Konradd Newland until the Quadrangular.
Their standout forward was flanker and captain Harvey Meyer, while stepping into the pivotal No 10 jumper was Pita Manamanaivalu.
Midfielders William Johnston and Josh Brunger had strong campaigns.
Collegiate looked forward to Wednesday's derby clash with Whanganui High School First XV - a normally annual fixture that was missed last year due to Covid.
They won 89-3 in the feature game, while earlier, the Collegiate Under 15s defeated WHS U15 92-0.
The First XV will then play Upper Hutt College on August 27, and should they win, go into the final of the Hurricanes Co-ed Cup against Wairarapa College.