 Under Petersen, Boise State recorded two undefeated seasons, three undefeated regular seasons, and reached the Bowl Championship Series twice.The 2006 season was capped with a memorable upset of Oklahoma in the Fiesta Bowl, while the 2009 team defeated TCU in the Fiesta Bowl to finish at 14–0 and were fourth in both major polls.They were just the second team ever to go 14–0 in the history of major college football.