Let’s call this Snow-pening Day.

The Yankees postponed their home opener Monday after a few inches of snow fell early in the morning to blanket the field and the seats.

The Yankees called the game just before 9 a.m. The game against the Rays has been rescheduled for Tuesday at 4 p.m. The gates open at 2 p.m.

The snow forced new Yankees manager Aaron Boone to delay his Stadium debut. When he woke up Monday morning, Boone saw the snow coming down and figured first pitch was in doubt.

“Huh, it really is 100 percent chance of snow at 7 a.m,” Boone said of his initial thoughts when he saw the snow. “I peeked out the window. My daughter and wife were sleeping in there. I thought, ‘This is going to be interesting.’”

As Boone drove to the Stadium, he became more convinced that the Stadium would remain dark on Monday.

“It was really coming down,” he said. “Obviously, [I’m] not surprised to get here and hear that it was called pretty quickly. It was going to be quite an ordeal to have any kind of a chance.”

Snow was not something Giancarlo Stanton ever had to worry about when he was with the Marlins. He said he remembers one time in Minnesota when temperatures were in the 20s, but not snow. Despite the snow coming down when he woke up, Stanton thought they would play until he got the official word.

“I’m ready to go,” Stanton said of his mindset when he woke up. “You’ve got to keep the same mindset that we’re ready to play until you get confirmation. I’ve had times where I look out and I’m like, ‘There’s not a chance,’ and you kick back a little bit and sure enough, you’re out there playing.”

The Yankees said they chose a 4 p.m. start Tuesday because of the rain that is in the forecast for Tuesday morning. On Monday, the snow tapered off in the late morning, but it would have been difficult for the Yankees to get the Stadium ready because of the accumulation. Delaying it until later in the afternoon probably was not an option because the team had its “Welcome Home Dinner” on Monday night.

The Mets-Phillies game at Citi Field was pushed to July.

While fans will be able to use their tickets at the teams’ rescheduled games, many weren’t happy about it.

“You guys pulled the trigger too quickly on this,” wrote one Twitter user, who pointed out that the snow had stopped by 11 a.m.

“Could’ve delayed the game til 4,” he said. “Horrible for fans that cant go tomorrow and we looking forward to this for months.”

To make matters worse for Yankee ticket holders, AccuWeather senior meteorologist Dan Dombek warns it’ll “probably be raining” in The Bronx when the first pitch is due to be thrown Tuesday, at 4:05 p.m.