Oklahoma State announced their 2015 football schedule on November 19, 2014. The 2015 schedule consist of 7 home games and 5 away games in the regular season. The Cowboys will host Big 12 foes Baylor, Kansas, Kansas State, Oklahoma, and TCU and will travel to Iowa State, Texas, Texas Tech, and West Virginia.[2]
The Cowboys hosted two non conference games against Central Arkansas and UTSA and traveled to its other non conference foe Central Michigan in Mount Pleasant, Michigan. Oklahoma State met for the first time against the Central Michigan Chippewas in Michigan and Central Arkansas Bears at home. The Cowboys hosted the UTSA Roadrunners for the second straight season after defeating them last season 43–13.
Oklahoma State hosted Kansas State on October 3, 2015. Late in the second quarter, an officiating error gave Oklahoma State a first down when the offense was four yards short after the third down play. The series ended with a touchdown for Oklahoma State.[4] The error brought into question Big 12 Conference officiating, especially in light that the game was on the 25th anniversary of the Fifth Down Game between the Colorado Buffaloes and Missouri Tigers.[5]SB Nation published "K-State lost to Oklahoma State, 36–34. Inept Big 12 officials gifted Oklahoma State a touchdown.."[6]
Prior to the game, during Oklahoma State University's annual Sea of Orange Homecoming Parade, 25 year old Adacia Chambers drove her car into a crowd of people at the parade killing 4 and injuring 47.