Colorado fired football coach Karl Dorrell after an 0-5 start in which the Buffaloes were outscored by more than 20 points in every game.
The school announced the decision Sunday, one day after a 43-20 loss at Arizona.
It was just the fourth 0-5 start in program history. Dorrell, 58, was replaced in February 2020 when Mel Tucker bolted for Michigan State out of the blue.
Dorrell waited to announce the news to Colorado after he had a chance to inform his staff and players.
Offensive coordinator Mike Sanford will serve as a temporary trainer.
In the Associated Press College Football Poll, Alabama was the closest vote in recent years to Georgia at No. 1 place regained.
The Jayhawks stand for the first time since 2009, the longest drought among current Power Five conference teams.
Georgia received 28 first-place votes in November 2019, becoming the first team to have the most first-place votes since Alabama, but the No. 1 is not.