2009-10: Jaedon Descheneau played for the Leduc Oil Kings bantam AAA team in Alberta. He was selected by Kootenay in the third round (62nd overall) of the 2010 WHL Bantam Draft.
2010-11: Descheneau averaged a point-per-game skating for the Leduc Oil Kings midget AAA team and competed for Team Alberta in the 2010 U16 Canada Winter Games. He scored 15 goals with 20 assists and 40 penalty minutes in 31 regular season games and scored 7 goals with 10 assists and 2 penalty minutes in 17 playoff games for the Oil Kings. Descheneau scored 2 goals with 2 assists and had 22 penalty minutes in five games as Team Alberta captured a bronze medal.
2011-12: Descheneau played in 54 of 72 regular season games for Kootenay in his first WHL season and represented Canada Pacific in the 2012 U17 World Hockey Challenge. He scored 3 goals with 11 assists and was -7 with 24 penalty minutes as the Ice finished fourth in the Central Division. Descheneau had no points nor penalties in the four-game playoff series with Edmonton. In five games for Canada Pacific he had no points and 2 penalty minutes.
2012-13: Descheneau was the second-leading scorer for Kootenay in his second season with the Ice behind 2014 draft-eligible center Sam Reinhart. He scored 30 goals with 48 assists and was +9 with 22 penalty minutes in 69 regular season games. Kootenay finished fifth in the Central Division and lost to Edmonton in a first round playoff series. Descheneau had 1 assist and was -6 with 2 penalty minutes in five playoff games. He was not among the 210 North American skaters in Central Scouting’s final rankings prior to the 2013 NHL Draft and was not selected.
2013-14: Descheneau was tied with Todd Fiddler for sixth in the WHL with 98 points in his third season with Kootenay. He led the Ice with 44 goals and had 54 assists; finishing +27 with 54 penalty minutes in 70 regular season games. Kootenay finished fourth in the Central Division and defeated Calgary before falling to Medicine Hat in a seven-game series. Descheneau scored 10 goals with 10 assist sand was -3 with 6 penalty minutes in 13 playoff games. In his second year of eligibility he was ranked 95th amongst North American skaters in Central Scouting’s final rankings prior to the 2014 NHL Draft.