In high school, Humphrey also competed at a world-class level in track. He won a silver medal in the 110 metres hurdles at the 2013 World Youth Championships in Donetsk, Ukraine. He lost to Jaheel Hyde of Jamaica, who established a new championship record and came .01 seconds shy of tying the World Youth Best held by Wilhem Belocian. Humphrey was also named to the "USA Today" All-American Track and Field Team.