The Rams (2-2) got off to a quick start in the first half and led by 29 points with 13:27 to go in the second half. The lead was too much for the Lights to overcome.
Colorado State led 33-11 with 5:56 to play in the first half before the Lights (4-3) went on a 14-6 run to get to within 14 before halftime.
Montana State Northern held CSU to 46 percent shooting from the field after the break but couldn't overcome the Rams' 43-25 halftime lead.
Colorado State shot 63 percent in the first half and 55 percent for the game. CSU held Montana State Northern to 39 percent shooting. The Rams also held a 34-29 edge on rebounds.