While at Miami, Johnson also ran for the Hurricanes track and field team. In 2002, he won the Big East 60-meter dash with a time of 6.81 seconds at the Big East Indoor Championship and followed that up by winning the 100-meter dash with a career-best time of 10.59 seconds at the Big East Outdoor Championships. He won the 200-meter dash at the 2003 GMAC Championships with a career-best time of 21.48 seconds. Also a top competitor in the 400 meters, he ran a career-best time of 46.47 seconds in the finals of the 2003 FHSAA Class 3A Championships.