Young conceded two late tries against Harden on Saturday as they slipped to a third straight loss.
The Yabbies were on their way to an upset win leading the Red Devils 14-12 late in the second-half, however it wasn't to be, as Harden crossed twice in the closing stages.
The result leaves Yabbies four points outside fourth-placed Condobolin with two regular rounds remaining.
President of the Young Yabbies rugby union club Ces Finley said it was a "particularly gutsy effort" at Harden.
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"They [Harden] have a slick backline, they put some early tries on us, we came back and thought we had it but they slipped through at the end," he said.
"It was a really, really tight game until about 70 minutes."
In a boost for Young's finals hopes, they'll host West Wyalong and Temora, two sides below them on the ladder, in the next two weeks, while Condobolin faces front runners Harden and Cootamundra.
"We need to beat them handsomely to try and knock Condobolin out. They face Cootamundra and Harden which is in favour, but our fate is in our hands," Finley said.