Ground was broken after the 1969 season, and it opened in September 1970 with a capacity of 14,500. Subsequent expansions were completed in 1975 and 1997, and current capacity sits at around 37,000. In August 2010, the university unveiled a $100 million expansion plan for Bronco Stadium. The first stage will include: adding a new facility to the north endzone to house the football offices, weight room, training room, equipment room and locker room; removing the track; and adding a 13,200-seat grandstand behind the north endzone. Later stages include: lowering the field to add 3,300 seats; completing the south endzone horseshoe; building an east side skybox; and renovating the east concourse. Seating capacity for the fully expanded Bronco Stadium will exceed 55,000.