Strong showings for Otago in domestic rugby through 2013 and 2014 were rewarded when Dunedin-based Super Rugby franchise, the named him in their wider training group for the 2015 Super Rugby season. Serving as back up to All Black Aaron Smith and Japanese international Fumiaki Tanaka, Renton was limited to just a solitary substitute appearance in his first season with the Highlanders. He was however promoted to the franchise's senior squad for 2016 at the expense of Tanaka, but, injury ended his campaign early after just 3 appearances from the replacements bench. Despite his injury problems, new Highlanders head coach, Tony Brown retained him in the squad for 2017.