Kalley Armstrong and Mary Parker scored third-period goals and Harvard held off Boston College 2-1 in the Frozen Four semifinals Friday night.
Emerance Maschmeyer stopped 43 shots for third-seeded Harvard, which advanced to the championship game for the fourth time in school history.
Seeking their first school title, the Crimson (27-5-3) will face top-seeded Minnesota in the final. The Golden Gophers (33-3-4) beat Wisconsin 3-1 in the first semi and are going for their third title in four years.
Emily Field scored for Boston College (34-3-2).
It was the third meeting of the season for the crosstown rivals. Boston College won 10-2 on Nov. 28, and Harvard got revenge Feb. 10 with a 3-2 win in the Beanpot Championship, stopping the Eagles' 27-game unbeaten streak.
"Oh my goodness, just another great battle with a crosstown rival - in Minnesota," Harvard coach Katey Stone said.
Armstrong broke a scoreless tie 6:34 into the final period when her low shot from the right circle knuckled its way toward the net and went between the legs of goaltender Katie Burt.
"I just tried to throw some junk on the net, pretty much. I wasn't meaning to have a dangerous shot," she said. "I kind of thought I'd go for the rebound. I had no idea it went until I saw the crowd stand up. Lucky, lucky bounce."
Parker scored short-handed with 7 minutes to play, but Boston College made one final charge after Field scored on a rebound.
"Our team spirit definitely picked up after that and we had some great chances," she said.
Looking for the equalizer, Boston College had the puck in the Harvard end for most of the game's final 90 seconds. But Maschmeyer and the Harvard defense were up to the task.
"It's a tough one to swallow," Boston College coach Katie King Crowley said.
Harvard had to play the last two periods without second-leading scorer Miye O'Dench, who was given a five-minute major and a game misconduct late in the first period for checking from behind. Boston College had seven shots on the power play, but Maschmeyer stopped them all. She improved to 18-2-1 in her last 21 starts.
Boston College had a goal waved off 1:29 into the game when it was ruled that Kristyn Capizzano kicked the puck into the net.
"We thought it should have been a goal," Crowley said.