"Ever since I came here in pre-season I've really enjoyed my stay and I'm over the moon to get it sorted," he told
"From day one I've felt welcome and all the boys are a different class."
Summerfield came through the youth system at Argyle and made 91 appearances for the club.
During his time at Home Park he also went out on loan to Bournemouth and Leyton Orient.
He added: "I'm still a young lad, but I've played a lot of games at Championship level and League One and hopefully I can take that experience into the squad, and hopefully it will bring success to Cheltenham."
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