I think that you are referring to the superbowl, but before that, there is the two divsion championship games that decide who plays in the superbowl.
The Alabama Crimson Tide defeated the Notre Dame Fighting Irish, 42-14 on January 7, 2013. Alabama, with a final record of 13-1, was also awarded the a "national championship" by the Associated Press, the National Football Foundation and the Football Writers Association of America along with a host of other "minor" championship selectors. Notre Dame, with a final record of 12-1, was awarded a "national championship" by the Colley Matrix, a "minor" championship selector.
On January 20, 2013, the San Francisco 49ers defeated the Atlanta Falcons, 28-24, in the National Football Conference Championship Game played in Atlanta's Georgia Dome.
There are two ways of answering this question. The Florida gators won the 2006 national championship, but the actual championship game was not played until January, 2007. The Texas Longhorns won the 2005 national championship, in a game played in January, 2006.
On January 7, 2012, Alabama defeated Notre Dame, by the score of 42-14, to win the BCS National Championship.
The results of the National College Football BCS Championship is pending the results of the game to be played on Monday, January 7th, 2013.
The championship game for the 2005 college football season was played at the Rose Bowl on January 4, 2006. The Texas Longhorns defeated the USC Trojans 41-38 to win the national championship.
Alabama plays Clemson in the national championship on Monday, January 9, at 8 pm EST
The 2014 College Football National Championship Game will be at 8:30 p.m. on January 12, 2015 EST on ESPN. The game will be between the University of Oregon and Ohio State University and will be played at AT&T Stadium in Dallas, Texas.
2010 BCS National Championship Game - 2010 TV was released on: USA: 7 January 2010
For the 2011 YearAFC Championship- Jets Vs Steelers (Jan 23 2011)NFC Championship- Bears Vs Packers (January 23 2011)Pro Bowl- (January 30th 2011)Super Bowl -(February 6th 2011)
2009 FedEx BCS National Championship Game - 2009 TV was released on: USA: 8 January 2009