Considered one of the top junior wicket-keepers in the country, Triffitt was selected in Australia's squad for the 2010 ICC Under-19 Cricket World Cup, as the only Tasmanian member. He played every match in the tournament, and took 17 dismissals, the most of any player. He also scored 117 runs during the tournament, at an average of 29.25. Having originally been granted a rookie contract for the 2009–10 season by the Tasmanian Cricket Association, Triffitt was upgraded to a senior contract for the 2010–11 season, and made his debut for the state in the 2010–11 Ryobi One-Day Cup, against Victoria at Bellerive Oval in February 2011. Over the following two seasons, he was generally Tasmania's first-choice wicket-keeper, replacing Tim Paine who was either playing for Australia or injured. Triffitt was also named in the Hobart Hurricanes' squad for the inaugural season of the Big Bash League, replacing the injured Evan Gulbis in the squad, and filling the role of the injured Paine. He played every match in the tournament for Hobart, scoring 76 runs at an average of 15.20, and taking five catches.