Thanksgiving weekend historically marks the end of the college football regular season, before conference championships and bowl games begin play in December (the Army–Navy Game is the lone exception). Today, this is only true for the top-level NCAA Division I Football Bowl Subdivision, where it has become a tradition to play a fierce rival on the last week of the regular season. At levels below the Bowl Subdivision, the NCAA begins its championship tournaments either on Thanksgiving weekend (for the Division I FCS championship) or the week before (in the cases of Divisions II and III; the NAIA, a separate body, also begins its tournament at that time). Other college football sanctioning bodies end their seasons well before Thanksgiving.
