Blackmon, who decided not to return for his senior year at Auburn, was injured during the 2008 season. He finished the year with 13 solo tackles and eight assists in six games.
The 6-0, 211-pounder was a high school All-American at LaGrange, Ga., High School. He redshirted in 2005 at Auburn and earned Freshman All-SEC honors the following season despite being suspended the first half of the season. He made 18 tackles that year and recovered three fumbles.
In 2007 the linebacker played in nine games, all starts, and finished the season with 45 tackles. He missed part of the season with an ankle injury.
John Hufnagel, head coach and general manager of the Stampeders, signed Blackmon along with former University of Albany and NFL linebacker Kurt Campbell. "We saw these linebackers at the free-agent camp in Florida and they both jumped out for different reasons," Hufnagel said.
"Blackmon is a typical inside-the-box middle linebacker who has great football instincts and plays with a nasty streak. Campbell is a very athletic outside linebacker who tested well, plays hard and shows a lot of versatility. They'll definitely be in the thick of the competition at camp."
Calgary will open the season July 1 vs. the Montreal Alouettes.