Late goals from Olly Lee and Pelly-Ruddock Mpanzu ensured Luton finished second in League Two with a 3-1 win against Forest Green.
The hosts went close early on as Mpanzu sent an effort wide, while visiting keeper Cameron Belford made superb saves from Dan Potts and Danny Hylton.
The deadlock was broken on 20 minutes, though, James Collins seeing his shot saved by Belford, only for Hylton to score his 50th goal for the club.
Belford then denied Hylton once more, parrying Elliot Lee's 20-yarder too.
A 1-1 draw with Carlisle was sufficient to clinch promotion for Luton, sparking wild celebrations amongst their 1,404 travelling fans at Brunton Park.
The Cumbrians had threatened to spoil the party when they took an early lead through a Danny Grainger penalty, but Olly Lee snatched the vital equaliser for Luton in the second half.
Carlisle started brightly and Hatters goalkeeper James Shea dealt with shots from Mike Jones and Jamie Devitt before the home side went ahead from the penalty spot in the...