Keihn, who originally planned to announce his oral commitment at the Under Armour All-America game Jan. 2, said he will announce his decision by Christmas.
His list of three is down from five, including Penn State and Miami. He said Thursday that he settled on his three finalists because of the combination of their proximity to home, his comfort level with the coaches and the players and the schools' engineering programs.
Keihn has close connections on the rosters at all three schools -- former Gilman teammates Shane Cockerille and Kenneth Goins at Maryland; Darius Jennings and Micah Kiser at Virginia; and Poly graduate Donovan Riley and Mount St. Joseph graduate Kyle Fuller at Virginia Tech.
Last week, Keihn, who lives with Gilman coach Biff Poggi and his family, hosted five college coaches for five consecutive nights of home visits. He has also heard plenty from advocates of all three schools on Twitter.
In the next few days, Keihn said, he will try to block out what everyone else thinks and focus on his own list of pros and cons for each school to help him come to a final decision.
"I visited all three schools at least twice, and I have great, great relationships with all the coaches there," Keihn said. "It's just about me doing the pros and cons, what I like and what I don't like about each school, where I would happy and where I would be more comfortable, how I feel about the kids -- just all those things, try to put them together and count up the points."
Keihn, 6 feet 3, 225 pounds, is a two-time All-Metro first-team defensive end who can also play linebacker. This fall, he had 85 tackles, including 16 for loss, nine sacks and two forced fumbles.