Johnstone, who grew up in northern Sydney , started snowboarding at the age of ten. In January 2006 he contested his first FIS race in Mount Bachelor and shortly afterwards, at the age of 15, took part in the Junior Snowboard World Championships in Vivaldi Park , South Korea for the first time . In March of the same year, the Australian finished 26th on his debut in the World Cup and thus achieved his first World Cup points. In the next two years he only competed in low-class competitions, in which he was placed in the top five several times and once finished third on the podium. At the end of the 2007/08 season he returned to the World Cup. Already in his first competition in Calgary he moved into the final, where a mistake threw him back to eleventh place. On March 9, 2008 in Stonehahm he came on the podium for the first time in his third World Cup race in third place. Following these successes, Johnstone received a scholarship from the Olympic Winter Institute of Australia (OWI) in April 2008 and was soon named Junior Athlete of the Year by the New South Wales Institute of Sport (NSWIS).
The following winter was even more successful for Johnstone: With two second places at the World Cups in Bardonecchia and Valmalenco , he finished second behind the Japanese Ryō Aono in the overall halfpipe World Cup at the end of the season. He also reached ninth place at the world championships in Gangwon-do . In the next season, Johnstone did not start in the World Cup, but instead prepared for the Winter Olympics in Vancouver , where he should represent Australia as the best halfpiper in the country. On January 21, 2010, a few weeks before the start of the Olympic Games, Johnstone broke his ankle during training , so he had to cancel his participation in the Olympic Games. In August 2010, Johnstone was junior runner-up in Cardrona, New Zealand , where he was only beaten by the Japanese Taku Hiraoka . The Australian's greatest success to date was on January 20, 2011: At the World Cup in La Molina , he achieved the highest number of points in the final and won the competition ahead of the Swiss Iouri Podladtchikov . Johnstone said after the win that the title meant a lot to him as he had trained very hard before the season to be successful.
Australia
World cup
TTR World Snowboard Tour
