In the 11th inning Stewart Ijames did the job again, this time with a sacrifice fly to put the Osprey (24-29, 7-8) in front 7-6.
The Chukars were in a position to tie it in the bottom of the 11th. They left the tying run on third base.
Missoula snaps the Idaho Falls four game winning streak. The Chukars were still able to win five in the seven game homestand.
The Chukars will travel to Montana on Monday and beginning at three game series with the Helena Brewers on Tuesday at 7:05pm.