After the departure of Kelly, the University of Oregon promoted Helfrich to head coach and Frost was later officially announced as the offensive coordinator and quarterbacks coach on January 31, 2013. In 2014, Frost was a finalist for the Broyles Award, given annually to the nation's top assistant coach. That season, his protégé Marcus Mariota won the Heisman Trophy en route to a berth in the National Championship game. In his three seasons as the Ducks' offensive coordinator, Oregon recorded a 33–7 record and finished every year among the nation's top six teams in terms of both scoring offense and total offense.