The Terps will play in the title game for the fourth time in six years.
Kelly registered 10 points.
Walsh went 6-for-15 after filling in for the injured Will Bonaparte.
Young started every game last season.
The goalkeeper made a season-high 12 stops in the snowy contest, including five in the fourth quarter.
Rambo notched a hat trick in the Terps’ 12-8 win over the Dragons.