As a freshman at Southern New Hampshire (2011), Gauthier made 6 appearances (two starts), posting a 1-1 record with a 1.56 ERA and 14 strikeouts in 17.1 innings pitched. This spring as a sophomore, Gauthier went 2-1 in 18 appearances with a 2.78 ERA and one save. In high school, Gauthier lettered in baseball, basketball, and cross country.