McIntosh saw limited playing time as a freshman during Georgia's 2019 season, garnering 174 yards and 2 touchdowns on 25 carries while playing behind fellow running backs D'Andre Swift, Brian Herrien, Zamir White, and James Cook.[4] As a sophomore in the shortened 2020 season, McIntosh rushed for 251 yards (third most behind White and Cook) and 1 touchdown on 47 carries (second most behind White).[5] In 13 games as a junior in 2021 (including the Southeastern Conference Championship and Georgia's two playoff games), McIntosh ran for 328 yards and 3 touchdowns on 58 carries (third most behind White and Cook), adding another 242 yards receiving and 2 touchdown catches.[6]
On December 31, 2021, in the first quarter of the Orange Bowl against Michigan (first round of the College Football Playoff (CFP)), Georgia ran a trick play in which McIntosh took a handoff from quarterback Stetson Bennett, rolled to the right, and completed an 18-yard touchdown pass to receiverAdonai Mitchell, putting Georgia up 14–0.[7] The Bulldogs later won 34–11 and advanced to the 2022 CFP National Championship. In the national championship, McIntosh rushed 2 times for 6 yards and caught 3 passes for 23 yards in the 33–18 win over Alabama.[8]