It was Roberson’s 14th double-double of the season and 17th of his career. Askia Booker had a career-high 15 points for the Buffaloes (15-7, 7-3 Pac-12).
Colorado, 6-0 at home in its first season in the Pac-12, scored 22 fast-break points and 16 points off 15 turnovers by Oregon State.
Jared Cunningham and Devon Collier had 12 points each for the Beavers (14-8, 4-6), who shot 37 percent from the floor and were outrebounded 43-31 in having a three-game winning streak snapped.
It was the worst loss of the year for the Beavers, eclipsing a 15-point setback to Washington.