2010-11: Kaapo Kahkonen appeared in one game with GrIFK in Finland’s Division 1 U16 league and played for the EJK club in Helsinki.
2011-12: Kahkonen moved up to the Blues club in Finland’s top league — skating in one game with the club’s U18 team and spending most of the season with the U16 squad. He also appeared in ten games for Finland’s U16 team and competed in the 2012 Youth Olympic Games. Kahkonen allowed two goals and had a .950 save percentage in his only U18 game. He received the Jukka Tammi Award as the top goalie in Finland’s U16 league; posting a 2.78 goals against and .901 save percentage in 16 regular season games. In nine playoff games he had a 2.17 goals against and .936 save percentage as Espoo captured the Finnish U16 championship. He had a 2.47 goals against and .926 save percentage in international play for Finland and at the Youth Olympic Games posted a 1.90 goals against and .923 save percentage in four games.
2012-13: Kahkonen assumed the goaltending duties for Espoo Blues’ silver medal-winning U18 squad as a 16-year-old and represented Finland in a pair of tournaments. In 28 regular season games he posted a 2.43 goals against and .917 save percentage as Espoo finished second to HPK in the regular season. Espoo lost to HPK in the playoff finals and in 12 playoff games Kahkonen finished with a 2.68 goals against and .901 save percentage. He was with Finland’s bronze medal U18 team in the 2013 World Junior Championship but did not see any action as a backup to HPK’s Juuse Saros. Kahkonen had a 4.48 goals against and .858 save percentage in four games in net for Finland’s U17 squad at the 2013 World Hockey Challenge.
2013-14: Kahkonen played for Finland’s U18 team at the Ivan Hlinka Tournament in August and was named the top goalie at the pre-season U20 Super Challenge playing for the Espo Blues U20 team against other clubs from Sweden, Finland and Norway. Kahkonen played nearly every game for the Blues during the junior season and was in net for Finland at the 2014 U18 World Junior Championship in Lappeenranta. In 38 regular season games for the Finnish champions he had a 2.49 goals against and .912 save percentage. Kahkonen was 8-2 in 10 playoff games, missing the final game as the Espoo U20 team swept Karpat in the best-of-five finals. He recorded one shutout and had a 2.10 goals against and .915 save percentage. Kahkonen had a 3.45 goals against and .881 save percentage in three games at the Ivan Hlinka tournament and was 2-3 with a 3.37 goals against and .886 save percentage in five games at the U18 WJC. He was ranked fourth amongst international goalies in the Central Scouting final rankings and was selected by Minnesota in the fourth round (109th overall) in the 2014 NHL Draft.
Kahkonen has the prototypical size for an NHL goaltender and is strong in all areas of the game. While utilizing a butterfly style, he appears in control at all times and has quick feet that allow him to move laterally quickly. Playing in almost every game for his junior team, he has proven to be durable and is technically sound.
Kahkonen is the heir apparent to Nashville prospect Juuse Saros (NSH) with regards to Finland's U20 and U18 teams and is a bit bigger than Saros. Beginning to separate himself from some of the other young Finnish goaltending prospects, though still developing, he could be the next goalie from that country to emerge as a starting goaltender in the NHL.