The forward pass was allowed for the first time during the 1906 college football season.
Although there was no obvious national champion, there were two teams that had won all nine of their games as the 1906 season came to an end, the Princeton Tigers and the Yale Bulldogs, and they played to a 0–0 draw on November 17, 1906.
St. Louis University ended with a record of 11–0–0. The Helms Athletic Foundation, created in 1936, determined Princeton to be the greatest college football team in 1906 retroactively.
Other selectors saw Yale as the 1906 national winners.