In 2017 – his redshirt sophomore season – Blankenship received a full athletic scholarship. He informed the team of the positive news after Georgia's 20–19 victory over Notre Dame. In the 2018 Rose Bowl, Blankenship made a record-long 55-yard field goal that proved pivotal in shifting the momentum away from Oklahoma, leading to Georgia's eventual 54–48 overtime victory. In the 2018 College Football Playoff National Championship game against Alabama, Blankenship hit a 51-yard field goal in overtime to put the Bulldogs temporarily ahead. However, Georgia ultimately lost the national championship game, 26–23.