never. but maybe this year! 12-0 so far..
16 seasons (1992-2007)
the green bay packers
The Utes have had 2 undefeated seasons in their history. One in 2004, and one in 2008.
11
None
The Steelers have never had an undefeated season in their NFL history.
9
Packers! They are undefeated
No. The 1972 Miami Dolphins are the only team to finish the season undefeated (17-0).
Fairmont Firebirds
Two
The Green Bay Packers defeated the pittsburg steelers. This happennned in the 2011 super bowl. The Green Bay Packers were not undefeated that year.