Andrus was born in Logan, Utah and grew up in Sepulveda, California (now called North Hills), a community in the San Fernando Valley of the city of Los Angeles.
[1][2] While attending Monroe High School, he played quarterback on the football team, earning first-team All-Mid-Valley League honors his senior year in 1975.
As a senior in 1980, Andrus shared starting quarterback duties with future Detroit Lions head coach Marty Mornhinweg.
One year later, Bart Andrus switched to the NFLE team the Amsterdam Admirals when the position of head coach became available there.
This is shown by the fact that the Admirals ranked number one in total offense in 2005, averaging 357.4 yards per game.
While guiding the Admirals to a league-best 7–3 regular season record in 2006, Andrus was once again coaching one of NFL Europe's most potent offenses, with his men averaging 332.3 yards per game.
On January 16, 2009, the Toronto Argonauts of the Canadian Football League announced that Andrus had been hired as head coach.
[8] On January 18, 2011, Andrus was announced as the new offensive coordinator for the Omaha Nighthawks of the UFL, serving under Joe Moglia, former president and CEO of the financial firm holding the team's home field's naming rights, TD Ameritrade.
On May 7, 2014, Andrus agreed to become the temporary head coach for one season with the Feather River College Golden Eagles.
[10] Andrus joined the Ottawa Gee-Gees of U Sports football in 2021 to serve as the team's quarterbacks coach.