Once again sitting out the 2014–15 season, he returned in 2015–16 and managed a 10th place. In the 2016–17 FIS Freestyle Ski World Cup, he became a regular contestant and won his first World Cup event, the big air contest in Voss in March 2017. His second win came in the 2017–18 FIS Freestyle Ski World Cup, the big air in Mönchengladbach in December 2017, followed by his third in March 2018 in Québec City.[1] He won the big air category of the 2017–18 Freestyle Ski World Cup.[2] The same year, he finished 5th in big air at Winter X Games XXII.[3]
His World Cup races from 2019 onwards included a 4th place in December 2019 in Beijing, a second place in November 2020 in Stubai and a fifth place at the same location in November 2021. His last race came in March 2023 in Silvaplana.[1]
At the Winter Olympics, Nummedal finished 28th and 23rd in slopestyle at the 2018 and 2022 Winter Olympics, respectively. His career best was a 10th place in big air at the 2022 Winter Olympics.[1][4]
At the World Championships, he competed in slopestyle at the 2017 World Championships and both slopestyle and big air at the 2021 World Championships—with mostly low placements. At the 2023 World Championships, he finished seventh in the big air event and won the silver medal in slopestyle.[1]
Nummedal retired in the spring of 2023. After winning a World Championships medal, he stated that "The next big goal I can set for myself is another Olympics, and I don't have it in me. It is better, then, to give up competitive skiing while I still love everything that has to do with skiing". Nummedal hails from Hakadal.[5]
