Olofsson made it 2-0 at 9:13, beating Vejmelka with a wrist shot off a pass from Sam Malinski.
Guenther’s power-play goal cut it to 2-1 at 10:49 when he sent a one-timer past the blocker of Wedgewood off a pass from Mikhail Sergachev.
“You haven't played for a while, so you want to make nice plays,” Guenther said. “You don't really have your A-game yet, so just playing your B-game solid, and I thought we did that better in the third.”
Nelson extended it to 3-1 at 12:20, scoring past Vejmelka with a one-timer off a pass from Gabriel Landeskog.
Guenther scored his second goal at 13:20 to cut it to 3-2 when he found a loose puck in the slot and beat Wedgewood blocker side.
Necas scored on the power play to make it 4-2 at 17:17 to make it 4-2, finishing glove side with a one-timer off a feed from Cale Makar.
“I felt like we had some good opportunities in the zone,” Makar said. “I think we just have to continue to build it…I really liked the patience that we showed tonight with the puck in the zone, especially good support.”
Brett Kulak played 19:03 of ice time in his Avalanche debut. The defenseman was acquired from the Pittsburgh Penguins for defenseman Samuel Girard and a second-round pick in the 2028 NHL Draft on Tuesday.
“For the most part he looked pretty comfortable in the structure of our game,” Bednar said. “I think he was someplace around 18, 19 minutes in his first game, which is good quality minutes against very skilled forwards, and he did a nice job.”
NOTES: Nelson recorded his fourth career 30-goal season and first with the Avalanche. Only six active U.S.-born players have more: Auston Matthews (nine), Kyle Connor (seven), Dylan Larkin (five), Jake Guentzel (five), Patrick Kane (five), Alex DeBrincat (five). … Guenther recorded his 10th multigoal game with the Mammoth, which is the most in franchise history. … Utah forward Michael Carcone did not play due to illness.