Greenfield was honored twice at Rock Valley High School as the team’s most valuable offensive lineman. He also starred on the defensive line for Rock Valley and rarely came off the field. Other than football he played both basketball and baseball. He committed to South Dakota State during his senior year.
Garret Greenfield starred at left tackle for the back-to-back FCS champion South Dakota State Jackrabbits. The Jackrabbits put together one of the most impressive running attacks across any level of college football, and Greenfield was one of the major
reasons behind it.
The big tackle started receiving major playing time in 2020-2021 and became an All-American starting at right tackle. In 2022, Greenfield repeated as an FCS All-American and was also named a team captain. Greenfield finished his career at the top of the college football mountain, with a championship trophy.
Greenfield is an athletic run blocker with a nasty demeanor. He consistently finished opposing players, bringing them to the ground during, and sometimes even after the the whistle blew. He was rather smooth in pass pro sets unless he felt threatened by speed. In the few instances where Greenfield had to hasten his sets, he rushed to get to his landmarks and even crossed his feet. Greenfield sometimes can be beat on the occasional inside move.