Hellbusch attends Deer Creek HS, where he was a teammate of Brian Anderson, currently a freshman on the Razorback baseball team. He finished his junior season with a team-leading 56 RBI to go along with a .362 batting average and nine homers. On the mound, Hellbusch was 9-0 with a 2.11 ERA. Hellbusch was a honorable mention All-State selection by The Oklahoman in 2011. Hellbusch was named All-Suburban Conference and first team All-Edmond in 2011.
"Isaac has tremendous power and can play several positions," (Razorback head coach Dave Van) Horn said. "In high school ball, he's been a pitcher, a catcher and played shortstop and third base. Isaac is a physically strong, good looking athlete. He has a chance to come in and battle right away to get in the lineup."