Hurn grew up in the Barossa Valley in South Australia and attended Angaston Primary and Nuriootpa High School. Hurn was heavily involved in school and local sporting clubs, allowing him to excel in his favourite sports: cricket and Australian football. Because of his love for the two sports, his decision to seek a career in AFL over cricket would have been presumably difficult.
Hurn’s more professional career began whilst playing his two favourite sports simultaneously. He took on a rookie contract with SACA (South Australian Cricket Association) in 2004, turning down the second one in 2005 to focus on his football. Hurn played football for Central District, making it to two premierships in 2004 and 2005. In 2005, Hurn was picked captain of the U-18 South Australian side and also picked in the U-18 All-Australian selection in football.
Picked 13th in the first round in the 2005 draft to West Coast Eagles, Hurn was considered as one of the top players to come out of South Australia at that time.
Hurn played just six games in 2008 because of injury, in what was a poor year for the Eagles, but he rebounded to play 22 games in 2009, and 15 in 2010. In 2011, he truly established himself as an elite kick and a highly damaging player off of the half back line. He was crucial to the Eagles' success, as they rebounded from the wooden spoon the previous year to a top-four team the next. Hurn played every game, including the three finals, including 15 disposals and a goal in the nail biting semi-final win over Carlton.
In 2012, Hurn continued his strong form, playing all 24 games, including an 18 disposal and one goal effort in the Elimination Final demolition of North Melbourne. West Coast missed the finals in 2013, their lack of penetration out of the half-back line noticeable as Hurn played only 12 games.
After Darren Glass retired midway through the 2014 season, Hurn was named acting co-captain of the club for the remainder of the season, along with four other players.
On 8 December 2014 it was announced that Hurn would become the 10th captain of the West Coast Eagles.