Lumb enrolled at the University of British Columbia in 2016 where he would compete for the Thunderbirds cross country and track and field teams.In July, he made his first Diamond League appearance at the Bislett Games in Oslo running 7:46.28 over 3000 m. In 2021, Lumb transferred to the University of Washington.In February 2023, Lumb was also a part of a group of eight University of Washington teammates that ran a sub 4 minute mile in the same race.[2] Shortly after, Lumb ran the second fastest indoor mile time in Canadian history, running 3:52.62 in Boston.[7] The next month he competed at the World Championships in Budapest in the 1500 m, where he finished eighth in his heat, failing to advance to the semi-finals.