Jersey beat Guernsey by six wickets at Farmer's Field to win the inter-insular clash for the third year in a row.
The visitors were reduced to 83-7 with Corne Bodenstein the pick of Jersey's bowlers with 3-25 from his eight overs.
Guernsey rallied to 168 all out, with tailender Tim Kimber top-scoring with 41no.
Home skipper Peter Gough led the way as the hosts reached their target in 34 overs, Gough hitting the winning boundary to finish unbeaten on 88.
Jersey coach Neil MacRae told BBC Radio Jersey: "We're absolutely delighted with the result, the boys played exceptionally well all the way through, and it's a great time to win a trophy at the end of the season."
The local league season finishes next Sunday, when a Jersey Cricket Board XI take on the Club Cricket Conference.