Trent was born in Columbus, Ohio in 1999. He is the son of former NBA first-round pick Gary Trent Sr., who also played multiple seasons of his career in Portland. Trent had always been considered an elite prospect early on while attending Apple Valley High School in Minnesota before transferring to Prolific Prep Academy in Napa, California, where he averaged 31.8 points per game as a senior. He was rated as a consensus five-star prospect entering his lone season at Duke, and was selected by the Kings in the second round of the 2018 Draft. Trent has three brothers named Garyson, Grayson and Graydon. Follow Trent on Instagram at @gtrentjr.