The Blackhawks, who were scheduled to practice at 10 a.m. ET, will practice at 11:30. The Bruins, scheduled for 3 p.m., will follow at 1 p.m. Each will have an hour of ice time before the Notre Dame men's team plays against Boston College at 5 p.m.
The family skates, which are planned for after each team's practice at the stadium, were cancelled.
"We can skate, and we have before in light rain because it doesn't affect the ice, it doesn't affect the conditions," Kris King, the NHL's senior vice president of hockey operations, said Sunday. "If there is a lot of rain, the ice gets too soft and you're talking about potentially having hazardous conditions for the players, and we don't want to put them in that and I don't think anybody is comfortable practicing in a rain storm."
The NHL had a similar issue last season before the Washington Capitals and Toronto Maple Leafs played in the 2018 Coors Light NHL Stadium Series game at Navy-Marine Corps Memorial Stadium in Annapolis, Maryland, on March 3.
Heavy winds made the League cancel the outdoor practices on March 2, forcing the Maple Leafs to practice at McMullen Hockey Arena, Navy's main rink on campus, and the Capitals to stay home and practice at their training facility in Arlington, Virginia.
The NHL gave the Capitals and Maple Leafs more time to skate during pregame warmups to test the ice, and King said he did not feel the game was impacted by the fact that neither team had a chance to test the ice the day before.
"It's not unprecedented but not ideal," King said. "You can't fight Mother Nature. We've got a plan in place. We're well prepared."
The ice crew began preparing to deal with rain Sunday, most notably readjusting the Olympia ice machines so they could be used to vacuum water off the ice surface. They also have squeegees and brooms ready if they have to manually get the water off the surface quickly.