The Hukerenui club outpointed the defending champions Western Sharks 9-6 in a tight, old fashioned encounter in the rain at Toll Stadium on Saturday.
Mid Northern captain David Twaddle was happy to capture some silverware for the club after the club's senior team was unexpectedly tipped out of their semifinal a week earlier.
"It was a classic final really with two fairly even teams. Whoever made the least amount of mistakes was going to win it," he said.
Twaddle said there were a lot of nerves on display during the match. "It was hard out there for both teams because conditions weren't ideal but we couldn't always blame that for our mistakes."