College football
Championship eras
Era presets are tied to structural changes in how a champion was selected or crowned. They are not arbitrary decades and they are not defined by which programs happened to win.
Default analytical range
1998–present
Modern Championship Era
The analytical default combines the BCS and CFP periods because each season ends with one championship-game or playoff champion under the published modern policy.
It is a useful modern baseline, not a claim that the BCS and CFP are the same postseason structure.
Era definitions
Founding Era
Intercollegiate football began with a small, heavily northeastern set of programs and no contemporary national-championship mechanism.
An epicenter from this period primarily describes where the sport existed and where later selectors placed historical champions, not a nationally balanced competition.
Boundary basis: First intercollegiate game 1869Reform and National Growth
Rules reform, the forward pass, governing institutions, stadium growth, and broader participation changed football from a regional experiment into a national college sport.
Geographic movement in this period should be read alongside expanding participation and retrospective championship selection.
Boundary basis: Forward pass legalized 1906Pre-Bowl Poll Era
The AP Poll began in 1936, but final national selections were commonly made before bowl games, so postseason results did not always affect the recognized champion.
Poll policy, not only performance, is part of the geographic record for this era.
Boundary basis: AP Poll begins 1936Post-Bowl Poll Era
Beginning in 1968, the final AP Poll consistently followed the bowl season, making postseason results a more regular part of the championship judgment.
Split AP and Coaches champions remain possible and are preserved as one equal-weight season point.
Boundary basis: AP final poll moved after bowls in 1968Bowl Coalition and Alliance
The Bowl Coalition and Bowl Alliance attempted to create title-deciding matchups among leading teams while conference and bowl contracts still prevented a universal No. 1-versus-No. 2 pairing.
This is the earliest verified coverage in the current public dataset and includes the 1997 split title.
Boundary basis: Bowl Coalition 1992-1994 and Bowl Alliance 1995-1997BCS Era
The Bowl Championship Series used rankings and designated bowls to place the top two teams into a singular national championship game from the 1998 through 2013 seasons.
Champography's Modern Championship Era begins here because the season policy can follow a designated championship-game winner rather than reconcile competing final polls.
Boundary basis: BCS National Championship Game 1998-2013Four-Team CFP Era
The College Football Playoff introduced two semifinals and a national championship game, selecting four teams from the 2014 through 2023 seasons.
This ten-season span is useful for comparing the geographic effect of the first playoff format with the BCS and the expanded bracket.
Boundary basis: Four-team College Football Playoff 2014-2023Expanded CFP Era
The playoff expanded to 12 teams beginning with the 2024 season, adding campus first-round games and quarterfinals before the semifinals and championship game.
The era is still a small sample; its epicenter should be labeled an early trend rather than a settled geographic pattern.
Boundary basis: Twelve-team College Football Playoff from 2024Why structural eras matter
A geographic comparison is easier to interpret when the underlying championship process is reasonably coherent. The BCS, four-team CFP, and expanded CFP are therefore separate presets, even though all are also included in the broader modern analytical range.
Era boundaries do not make the teams on either side incomparable. They give the user a historically defensible starting point and make changes in the map easier to connect to changes in the sport itself.
Primary boundary references
- College Football Playoff: BCS all-time results
- NCAA.com: how the College Football Playoff works
- NCAA.com: 12-team CFP begins with the 2024 season