Hall Farm Glasshus endured double disappointment in their final two matches of the season.
The Sunderland side hoped to add to their Durham County Minor Cup triumph with two more pieces of silverware.
But, instead, they lost the League Challenge Cup final and the league title decider.
Durham City Reserves finished their season on a high with victory in the League Challenge Cup final.
They edged home 1-0 against Glasshus at neutral Seaham Town Park, with Daniel Lawlor firing the only goal with a low strike five minutes before the interval.
City had a goal disallowed in the second half, while Hall Farm had an effort cleared off the line late in the game as they pressed for an equaliser.
Joe Whelan starred for City, with Josh Tuckwell top man for the Wearsiders.
In midweek,Hall Farm needed only a draw in their final match to seal the league championship, but a 3-0 defeat saw hosts Wheatley Hill WMC take the trophy.
They had drawn 4-4 in their previous league meeting, back in August, but it was not to be Hall Farm’s night.
Lee Westgarth was the hero with two goals for Wheatley, backed by a strike from sub Kyle Middleton. Jamie Yorke stood out for the winners.
The win saw Wheatley finish a point above Hall Farm, with 26 points from 12 games.
They completed a treble, adding the title to the Clem Smith Bowl and the Washington Aged Peoples Trophy.