Thomas Bropleh tied a season-high by scoring 18 points, hitting 4 of 8 from deep, as Boise State (17-9, 7-6 Mountain West) shot 54.7 percent (29 of 53) from the field, 59.1 percent from 3-point range and 13 of 13 from the free throw line. Derrick Marks added 13 points and three steals.
Daniel Bejarano's jumper with 15:47 left pulled Colorado State (14-13, 5-9) within four, but the Broncos hit 3-pointers on their next three possessions during an 11-3 run to build a 57-45 lead with 13 minutes to play.
Jon Octeus made a layup with 2:18 remaining to cut the Rams' deficit to seven before Boise State closed the game on a 7-2 run.
Bejarano led CSU with 23 points.