Garrity, 22, has made a total of 79 appearances, scoring 19 goals, including 11 this season which places him as the club's top scorer.
After turning down offers to become a full-time professional in the summer, Garrity has now put pen to paper with Blackpool to turn full-time and get a chance to prove himself in the Football League.
Chairman Toby Macormac said: “It’s a monumental day for the club, with a player gaining Football League status via us for the first time in more than 20 years.
“It’s testament not only to Ben’s hard work, but also that of our manager Paul Carden, who has worked tirelessly to help bring the player on and develop him in to a position where multiple clubs have shown an interest.
“It is a positive that Warrington Town can be seen as a place that young footballers can come and not only impress in the first team, but be developed to an extent that they are then given the chance to become a full-time footballer once again."
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