2010-11: Jacob de la Rose, who began playing hockey in eastern Sweden in his hometown of Arvika, moved west to join older brother Erik and play in Leksand after skating in six games for Farjestad's U18 team in 2009-10. He made his debut in Sweden's U20 SuperElit league, playing two games with Leksand's U20 team and spent most of the year with the U18 and U16 squads. De la Rose scored 1 goal in two U20 games. In 30 regular season games with Leksand U18 he had 12 goals with 13 assists and had 22 penalty minutes. He had 4 assists in six playoff games. De la Rose dominated at the U16 level, scoring 7 goals with 8 assists in just six games. He gained some international experience playing for Sweden at the U16 and U17 levels; scoring 6 goals with 3 assists in 10 games with the two teams.
2011-12: De la Rose made his debut in Swedish pro hockey as a 16-year-old — skating in 14 regular season contests and all 10 Kvalserien games for Leksand's men's team — and represented Sweden in three junior championship tournaments. He scored 2 goals with no assists and 8 penalty minutes as Leksand finished second in Sweden's second league, Allsvenskan. De la Rose scored 2 goals and was minus-2 in the six-team post-season (Leksand finished fourth failing to secure one of the two Elitserien spots). In 28 games with Leksand's U20 team, de la Rose scored 4 goals with 9 assists and was minus-six with 24 penalty minutes. He was scoreless in four games at the 2011 U19 World Junior A Challenge in Canada, scored 1 goal with 3 assists for Sweden at the 2012 U17 World Hockey Challenge, and scored 1 goal with 2 assists as Sweden won a silver medal at the 2012 U18 World Junior Championship.
2012-13: De la Rose spent most of the season playing for Leksand in Allsvenskan and competed for Sweden in the 2013 U20 and U18 World Junior Championship tournaments. De la Rose was the leading scorer amongst junior players in Allsvenskan, finishing with 6 goals and 6 assists in 38 games and was plus-eight with 31 penalty minutes. He had 1 assist and was plus-one in 10 Kvalseries games as Leksands, which was first in Allsvenskan, finished second to earn an Elitserien spot for 2013-14. De la Rose was scoreless and plus-one in six games as Sweden captured a silver medal in the U20 WJC and captained Sweden's team at the U18 tournament. He had 1 goal with 2 assists, and an even plus/minus, in five games as Sweden lost to the USA in the U18 quarterfinals. De la Rose was ranked seventh amongst European skaters in Central Scouting's final rankings prior to the 2013 NHL Draft.