An elite Upper East Side private school’s annual ice-skating party at Trump Wollman Rink in Central Park had to be canceled after parents refused to send their kids in protest of the president, sources said.

The Parents Association at The Dalton School sent a letter Thursday announcing the “Dalton on Ice” event was scrapped, saying “it would not be financially prudent” because of “significantly lower attendance.”

Dalton’s PA president, LaMae DeJongh, declined to comment — but sources said the low attendance was due to rampant anti-Trump sentiment at the elite prep school, which boasts alumni such as CNN’s Anderson Cooper.

“I think it is completely insane,” said one Dalton parent who disagrees with the protest. “Like him or not, it feels like a strange place for New Yorkers to protest. And sad that kids now have no skating party.”

Trump renovated the rink in 1986 after the city fumbled the job for six years.

Another Dalton parent said a clique of Upper East Side “liberal moms” upset with Trump pressured the headmaster to call off the event, a source said.

Trump Wollman Rink had no immediate comment, and Headmaster ­Ellen Stein could not be reached for comment.