UC Davis (3-4, 2-2 Big Sky) used a balanced attack, including 309 yards and 3 TDs through the air and 338 yards and 4 TDs on the ground.
Redshirt freshman Courtney Williams rushed for 84 yards and 3 TDs, including a 55-yarder in the first quarter.
"I knew what the play was designed to do and it worked," Williams said of his first-quarter score. "The defense took the bait."
UC Davis' Randy Wright passed for 309 yards and 3 TDs.
Idaho State (1-5, 0-3) managed to keep up with UC Davis in the first half and early in the third, but began to fade.
Yost's performance was about the only thing UC Davis coach Bob Biggs could point to when considering areas in which his team may have come up short.
"We knew they were going to throw the ball and we couldn't get as much pressure as we hoped we would," Biggs said.
Despite pulling away to a 14-point lead early in the fourth quarter and forcing Idaho State to punt in their next possession, UC Davis wasn't able to turn its back on the Bengals. With nearly 12 minutes left in the game, Wright threw his only interception of the game.
It was deep in UC Davis territory and put Idaho State on the Aggies' 14-yard line. It took Yost just one play, a 14-yard pass to receiver Luke Austin, to bring the Bengals within a TD.
But the Aggies' next drive proved to be a prime example of Biggs' game plan -- using depth at running back to set up his passing game. The Aggies, starting from their 8, ran five consecutive running plays, taking the ball to their 34.
That's when Wright threw a 41-yard bullet down the middle of the field to receiver Alex Cannon. It was his only catch of the day and put the Aggies on Idaho State's 13-yard line. Four plays later, it was Williams taking it in from the 2-yard line for his third TD of the game.
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Graduate transfer quarterback Davis Webb has officially joined California, giving the Golden Bears an experienced option to replace No. 1 overall NFL draft pick Jared Goff.
First-year football coach Dino Babers, hired by former Syracuse AD Mark Coyle, is on the committee that will search for Coyle's replacement.
Hugh Freeze has some major holes to fill on offense with the departures of Laremy Tunsil and Laquon Treadwell, but there is Chady Kelly and good depth.
After transferring in from Montana State, Dakota Prukop has a checklist he's working from as he prepares to compete for the Oregon job.
The destination for Week 6 of the Big 12 Ultimate Road Trip is unanimous, as all three conference reporters would head to the Red River Rivalry.