Bohn made a hole-in-one at a 1992 Tuscaloosa charity golf tournament, which earned him a $1 million prize. At the time, he was a sophomore at the University of Alabama and a member of its golf team. He gave up his golf scholarship and amateur status immediately and took his chances on the professional tour.
Bohn did not win a professional tournament until 2000, when he won the Shell Payless Open on the Canadian Tour. He scored another win the next year in the Bayer Championship. His final round score of 58 was 13 under par and set a new record at Huron Oaks Golf Course.
In 2003, Bohn won his first tournament on the Nationwide Tour, taking the Chattanooga Classic. Again he made history, setting a new tournament record with a four-day score of 263. He also had two near-misses, losing in playoffs at the Oregon Classic and the Samsung Canadian PGA Championship. Overall, Bohn posted five top-10 results in 2003, which was enough to finish ninth on the money list and earn entry to the PGA Tour.
In 2004, Bohn's first year on the PGA Tour, he made the cut in 21 of the 29 tournaments in which he played. Unfortunately, this only ranked him at 131st on the money list, which was not enough to keep his PGA Tour card. Bohn was forced to go through the PGA's qualifying school in 2005, where he finished in a tie for ninth place and regained his PGA card. He was successful on the PGA Tour for the remainder of 2005, finishing 35th on the money list and winning the B.C. Open. He posted three top-10 finishes in 2006 and had a stretch where he made the cut in 14 consecutive tournaments. Through the first week of August, Bohn had played in 18 PGA Tour events in 2009, making the cut in 12. His best result to date was a sixth-place finish in the Shell Houston Open.
Bohn struggled with injuries in 2007 and 2008, retaining his PGA Tour card with the assistance of a medical extension. In 2007, he injured his ribs while playing the Memorial in June, then reinjured himself a month later in the A&T National tournament. He was limited to only 15 events in 2008 because of a herniated disc in his back and complications from the resulting surgery.