Ronaldson continued playing regularly in his second season, featuring mainly at out-half. An injury against Munster in January 2015 disrupted his later season, but he made a total of 12 appearances in the league and five in the Challenge Cup. In the 2015–16 season Ronaldson continued to appear regularly, primarily playing as an inside centre alongside Bundee Aki. He was named the team's Player of the Month for November 2015 in recognition of these performances. Ronaldson suffered a knee injury in the end-of-season run in as Connacht chased a place in the knockout stages of the league. He ultimately missed out on playing in the team's Pro12 triumph, making a total of 20 appearances in the season. In April 2016, it was announced that Ronaldson had signed a further extension to his deal, taking him through to summer 2018.