He set a North Carolina record with 66 touchdown passes while taking his team to its fifth consecutive state championship his senior year.

During the first four years of his career at the University of Georgia, Cox had scattered playing time and completed 33 out of 58 pass attempts for 432 yards with five touchdowns and one interception.

[3] As a redshirt freshman in 2006, with Georgia trailing Colorado 0–13 at home late in the third quarter, Cox was put in the game to relieve the ineffective starter Matthew Stafford.

In Georgia's 52–41 win over Arkansas in Fayetteville, he threw for a career-high 375 yards and matched a team record with five touchdown passes.

In his final game at Sanford Stadium, the Bulldogs had a 14-point half-time lead, but Cox threw two interceptions in the fourth quarter.

The Bulldogs topped the 2009 season off with an Independence Bowl victory over Texas A&M, with Cox throwing for 157 yards and two touchdowns.

On February 3, 2015, it was announced that Cox had left Mallard Creek High School to become a graduate assistant for the Colorado State Rams.