Purdy is the middle child of Shawn and Carrie Purdy. His father, Shawn, was a Minor League Baseball player for eight seasons. His older sister, Whittney, played softball at Southeastern University, and his younger brother, Chubba, became a starting quarterback at Perry High School and was later recruited to Florida State.

Purdy played quarterback in a flag football league, which his father credits with helping develop his faster processing speed.