Kohn, 28, made the Angels' Opening Day roster and compiled a 3.04 ERA in 25 appearnaces before being optioned on June 3. At one point he went 17 straight appearances without allowing an earned run. The Rays snapped that streak on May 16 at Angel Stadium.
Though he had another stint in the Major Leagues this season (June 28-July 1), he did not pitch.
Kohn has a 3.52 ERA in 88 appearances the past two seasons since missing the 2012 season due to Tommy John surgery. He is 5-6 with a 3.67 ERA and 8.7 strikeouts per nine innings pitched over four Major League seasons.
Kohn's first career win came on Sept. 17, 2010 against the Rays at Tropicana Field.
Kohn will join what appears to be a crowded bullpen. The Rays headed into the offseason with a host of right-handed relievers, including: Grant Balfour, Brad Boxberger, Kirby Yates, Joel Peralta, Brandon Gomes and Steve Geltz.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.