Utah State finished 3-9 last season, including 1-7 in the Mountain West Conference. The Aggies failed to reach a bowl game for the first time in six years.
"I'm very grateful for this opportunity and for the confidence that coach Wells has shown in me," said Yost. "Being an offensive coordinator is a big responsibility and I'm looking forward to helping Utah State football."
In Yost's one season at Oregon, the Ducks ranked 16th nationally in total offense (491.7). They also ranked 27th in scoring (35.4) and rushing (226.4). Oregon quarterbacks threw only six interceptions.
Yost graduated from Kent State in 1992.