There were last over finishes in both the Faughan Valley and Eric Cooke finals with Newbuildings edging out Fox Lodge and Glendermott beating Ardmore.
In the Faughan Valley decider at the Foyleview Arena, Mark Heywood hit 5 sixes and 4 fours in his entertaining 60 while Jason Milligan (34) and Jonny Robinson (30) helped visitors Fox Lodge post 169-5 from their 20 overs.
The pair shared an 82-run stand that helped the Foxies recover from an excellent effort with the ball from Johnny Thompson who claimed 4-17.
Skipper Gareth McKeegan hit 4 sixes and 4 fours as his 47 made sure the home side stayed up with the pace early on in their reply.
Chris Cooper's 34 (4 sixes and 2 fours) came at precisely the right time for Newbuildings and that innings, coupled with 26 from Mark Hanna and a hard-hit unbeaten 22 from Trent McKeegan got them over the winning line with just one ball to spare.
The final game of the day, and indeed the domestic season saw Glendermott claim the Eric Cooke cup in front of their own supporters.
Credit both themselves and Ardmore who took the field in less than ideal conditions to play the final five overs to ensure a result on the day.
The home side were asked to make 40 runs from those 30 deliveries and that they did with just two to spare.
Scott Laird made 21 of those and although Sean Gormley picked up 2-2 to keep the game on a knife edge, Glendermott had just enough about them.
Eight were needed off the last over and Jason Lynch's maximum ensured the Rectory side picked up the trophy for the second time.
Earlier, Jarred Wilson (54) and David Bezzant (26) had fared best in Ardmore's 122-8.
Steve Moore (4-13) and Reece Laird (2-15) bowled well and played a major role in ensuring it was their day.
It was a competitive end to a summer in which sport has been put sharply into perspective. And ironic that it finished in the same way.