Northern Colorado's success was brief as Matt Johnson II and Daylen Kountz buried 3-pointers in succession to start the game. But Washington State countered with 12-straight points and the Cougars (8-4) led the rest of the way.
Johnson sank a pair of foul shots with 4:17 before halftime to reduce Northern Colorado's deficit to 24-20, but Rodman responded with a 3-pointer and WSU closed the half on a 17-6 run and led by double digits the rest of the way.
In moving their record to 3-1 against Big Sky Conference teams this season, WSU's Michael Flowers and Andrej Jakimovski each scored 16 points, Efe Abogidi 12, and Noah Williams 11.