2010-11: Jake Walman skated for the Toronto Red Wings bantam team coached by former NHL forward Claude Lemieux. Lemieux, whose son Brendan also skated for the Red Wings, shifted Walman from defense to forward at times due to his lack of size.
2011-12:Walman played forward for the North York Rangers midget minor team in the Greater Toronto league. He scored 10 goals with 12 assists and 18 penalty minutes in 33 games. In four games for the Rangers at the OHL Cup he had 1 assist.
2012-13: Walman shifted back to defense playing for the Toronto Junior Canadiens midget AAA team in the Greater Toronto Hockey League. In 23 games he scored 2 goals with 9 assists and 11 penalty minutes.
2013-14:Walman played for the for the junior A Toronto Junior Canadiens and was named the Ontario Junior Hockey League’s Rookie of the Year and Top Prospect. In 43 games he scored 7 goals with 26 assists and 87 penalty minutes. Walman missed the playoffs due to injury. In January he committed to playing college hockey at Providence in 2014-15. He was selected by Peterborough in the sixth round (112th overall) of the 2014 OHL Priority Draft in April in his third year of draft eligibility. Walman was ranked 47th amongst North American skaters in Central Scouting’s final rankings prior to the 2014 NHL Draft.