At the 2004 World Junior Championships in Athletics, Kimmons was part of a Gold medal winning 4×100 meters relay squad that established a junior world record with 38.66 seconds. Kimmons attended Hinds Community College, where he won three individual national championships (200 m outdoor in 2005, 60 m and 200 m indoor in 2006) and set national championship indoor meet records at 60 m and 200 m. He committed to Mississippi State University in November 2005, but chose to turn pro in March 2006.