Avalanche coach Jared Bednar said he's been waiting for Grubauer or Semyon Varlamov to seize control of the No. 1 position.
"I just felt [Grubauer] looked really solid in the net, like he was in control of the game," Bednar said. "I haven't felt that way about our goaltending for the last little bit, and that's what we need. We need those guys to take control of it and to be real sharp and to be on top of their game and give us a chance to sort of find ourselves."
Montreal took a 1-0 lead on a power-play goal by Gallagher at 5:43 of the first period. Jeff Petry took a shot from the blue line and Gallagher redirected it from the slot. The Canadiens were 0-for-25 on power plays in the previous eight games.
"It came from pretty good puck movement and a simple shot," Gallagher said. "That's what we're talking about, just simplifying it. It's just one goal but hopefully it's something to build off.
"We knew it was going to be tough coming in here. They're one of the best teams in the league for a reason. It was a tough game back and forth, they found a way to outwork us for one more goal."
Rantanen tied 1-1 at 4:21 of the second period. MacKinnon intercepted Price's pass for Shea Weber and passed to Rantanen in the slot for a shot over the goalie's right shoulder.
"We wanted to get a really good forecheck and Nate did a really good job of reading the play," Rantanen said. "Price turned it over and I just tried to yell for Nate and he made a quick pass and Price couldn't recover. It was a good play by Nate."
Said Price: "I gave it to their guy. I thought I had more room than that, obviously."