Askia Booker scored 13 points, including eight straight late in the second half after the Cardinal had trimmed an 18-point deficit to eight.
Roberson, who also had 20 boards against Fresno State last month, nearly had his eighth double-double of the season by halftime as the Buffs took a 44-29 lead into the locker room.
Colorado (13-6, 3-4 Pac-12) hadn't beaten the Cardinal (11-8, 2-4) since Dec. 23, 1990, in Boulder, losing five straight in the series.
Chasson Randle had 15 points for Stanford. The Cardinal's leading rebounder and third-leading scorer, Josh Huestis, was plagued by foul trouble and was held to six points and six boards in 19 minutes.
More Sports Headlines
Mochmar goes from high school football player to college cheerleader Expect holdout of Seahawks' Chancellor to continue for a while Men in Spandex: There's something about a man in form-fitting cycling shorts Felix wins 14th, Cruz hits 33rd HR as Mariners beat Rangers 4-2 Barrett injured as Sounders fall 3-1 to Galaxy Could this be a breakout year for Huskies’ Washington? AquaSox beat Canadians 6-3 Johnson wins Funny Car title at NHRA Northwest Nationals
Our new comment system is not supported in IE 7. Please upgrade your browser here.