It was a gutsy display by the visitors, who were deprived of possession for much of the game, but who grabbed the few chances that came their way and held a seven-point advantage late on.
The Dalesmen dominated early on and, in the 14th minute, stand-off James Guy marked his first-team debut by charging down James Christie’s kick and following up for the try.
Blaydon’s first assault brought an equalising driven score by hooker Rob Kalbraier.
Blaydon broke and scored a 45th-minute try through Christie, converted by ex-Wharfedale stand-off Andy Baggett, who was then yellow-carded, allowing by Tom Davidson to kick a penalty. With just four minutes remaining, No 8 Josh Burridge was forced over for the winning converted try.