Hartpury were promoted to National Division One after a thrilling victory over their closest challengers Ampthill on Saturday.
Their visitors from Bedfordshire did their best to spoil the National Two South title party and were only two points adrift with a quarter-of-an-hour to play.
But a quickfire double from wings Steph Reynolds and Jaike Carter ensured that Hartpury will play third-tier rugby for the first time in their history next season.
In a rip-roaring first quarter, Ross Moriarty broke the deadlock when he crashed over out wide following Steve Leonard’s strong carry, with Billy Burns converting.
From the subsequent kick-off, flanker Tom Ailes raced away and his sliced kick bounced kindly for Reynolds to grab his first in the corner.
Ampthill opened their account courtesy of a penalty from Elliot Clements-Hill, who was then on hand to convert Matt Burke’s five-pointer off a driving maul.
Burns and Clements-Hill exchanged penalties shortly before the interval to maintain the two-point gap between the sides.
Hartpury were quick out of the blocks after the restart and centre George Boulton danced his way through to score the first try of the second period, which Craig Jackson improved as Burns struggled with a groin injury.
Burke produced a carbon copy of his first effort to keep the visitors in touch, while Jackson and Clements-Hill traded tee shots as the game remained on a knife-edge.
Reynolds burst through off a scrum to rack up the bonus point for Hartpury and the contest’s turning point swiftly followed.
With Ampthill attacking deep inside Hartpury territory, referee Phillip Davies awarded them a penalty in front of the posts.
Trailing 32-23 with more than 10 minutes remaining, the away side somewhat surprisingly opted to go for the lineout in the corner.
And it proved a fatal decision as Hartpury stole the ball before breaking the length of the field through Burns, Ben Vellacott and Leonard, with Carter providing the finishing touch to all but seal the result.
Ampthill refused to roll over and James Wright crossed near the posts shortly afterwards, but Hartpury were not to be denied as the National Two South title confirmed an eighth promotion in their 10-year existence.
“For a number of years now, it’s been a goal for Hartpury College to attain National One status,” said Hartpury’s director of rugby Alan Martinovic. “To be part of that group that has attained that goal is deeply satisfying.
“This has been an absolutely fantastic season. That’s not just the achievements today, but also our wins in the BUCS competition and the Under-18 AASE League, which I think can be described as a very unique achievement.
“I’m absolutely delighted to have been a part of that and it’s been a pleasure to lead it.”
AMPTHILL: E Clements-Hill; G Williams, R Davies, J Raven, D Adamson (J Morgan 74); J Tarrant, K Barrett; S Walsh (J Wright 52), A Bloisi (V Ma’asi 41), J Sproston; P Lane, K Braband; D Dyer, M Burke (J Bercis 78), M Molitika. Not used: D Lavery.
HARTPURY: C Jackson; S Reynolds, S Leonard, G Boulton, J Carter; B Burns (T Fanolua 74), B Vellacott (A Williams 74); J Gibbons, C Fortey (W Tanner 60), W Thompson (J Litchfield 76); W Waldron, R Moriarty; T Ailes, A Woodburn, A Chesters (D McKee 63).
REFEREE: Phillip Davies (RFU)