Justin Lewis is a cornerback from Fontana, California who attended Rancho Cucamonga High School. A three-star composite recruit, Lewis recorded 21 tackles and seven pass breakups during his high school career. He earned team captain honors as a senior and was named all-league as a junior. Lewis also competed in basketball and posted a 100-meter time of 11.1 seconds. He joined Colorado State as a true freshman for the 2025-26 season wearing number 22.