Dallin Bachynski finished with 13 points, while Jordan Loveridge chipped in 12 and Brekkott Chapman added 12 for the Utes (19-4, 9-2 Pac-12), who opened the second half with a 15-2 run to cruise past the Cardinal.
Anthony Brown led Stanford (16-8, 7-5) with 15 points, and Marcus Allen scored a career-high 13.
Utah closed the first half with a 6-0 run, including two buzzer-beating baskets from Bachynski, to take a 33-27 lead into halftime. Stanford led 10-4 out of the gate with the help of four offensive rebounds, but Utah responded with a 17-5 run sparked by eight straight points from Chapman.
California 68, at Colorado 61: Jordan Mathews scored 19 points and the Golden Bears stretched their winning streak to five.
Tyrone Wallace's five-foot jumper with 21 seconds left put Cal ahead 65-61 after the Buffaloes had used a 13-5 run to pull within two. Sam Singer then stole the ball at midcourt from Askia Booker, and David Kravish was fouled and sank two free throws to seal it.
Mathews hit five three-pointers as the Golden Bears (16-9, 6-6 Pac-12) ended a six-game skid in Boulder, where they last won on Dec. 16, 1974.
The Buffaloes (11-12, 4-7), who were coming off a 28-point blowout loss to Utah, lost back-to-back home games for the first time under fifth-year Coach Tad Boyle. Mathews' first three-pointer came during a run that put the Golden Bears ahead 26-20 before the Buffaloes pulled to 28-27 at halftime.