Kosmachuk was brought in via trade by Washington from Colorado along with a 2020 second-round pick and 2020 third-round pick in exchange for Andre Burakovsky.
Kosmachuk was placed on waivers by the Avalanche on Thursday, Renaud Lavoie of TVA Sports reports.
Kosmachuk agreed to terms on a one-year contract with Colorado on Monday.
Kosmachuk wasn't extended a qualifying offer by the Jets and will become an unrestricted free agent.
Kosmachuk was reassigned back to the AHL Manitoba affiliate following Thursday's game against the Kings.
Kosmachuk notched a helper -- his first NHL point -- and two PIM in Saturday's 3-2 win against Colorado.
Kosmachuk was called up from AHL Manitoba on Tuesday.
Scott Kosmachuk allowed his emotions to get the better of him following Sunday's loss to Edmonton in the Memorial Cup final.
Guelph lost the Edmonton Oil Kings by a score of 6-3 after coasting through the round robin. Kosmachuk smashed his stick to bits and didn't speak to the media after the loss. The 20-year-old Winnipeg Jets prospect is expected to play in the AHL with the St. John's IceCaps next year, as he begins his professional career. "Scott earned a 100-point season and he's continued to get better as a player," said Jets GM Kevin Cheveldayoff. "He's proven to be a consistent scorer and he plays with a chip on his shoulder. He's progressing well."
Winnipeg Jets prospect Scott Kosmachuk will play for the Memorial Cup later this week.
His OHL champion Guelph Storm will play the Edmonton Oil Kings, who won the WHL title, on Saturday. Kosmachuk racked up a personal best 49 goals and 101 points in 68 games during the regular season. He added 10 markers and 28 points in 20 matches during the playoffs. Kosmachuk is slated to play in the AHL next season with St. John's, but he'll try to crack the Jets at training camp.
The Winnipeg Jets have agreed to terms with forward Scott Kosmachuk on a three-year, two-way, entry level contract.
The 19-year-old will earn an average annual salary of $925,000. Kosmachuk played in 34 games with the OHL's Guelph Storm this season, recording 25 goals and 23 assists with 56 penalty minutes. The Toronto native currently sits second among his teammates in points and first overall in goals. He has played in 237 career games with the Storm over four seasons for 96 goals and 97 assists. He was originally drafted by the Jets in the third round, 70th overall, in the 2012 NHL Entry Draft.