Ridley played in 11 games as a true freshman at Georgia in 2016, catching 12 passes for 238 yards and two touchdowns. As a sophomore in 2017, he had 14 receptions for 218 yards and two touchdowns. As a junior in 2018, Ridley had 43 receptions for 559 yards and nine touchdowns. After the season, he decided to forego his senior year and enter the 2019 NFL Draft.