2013 Bronco Field Sports Calendar Broncos work on a blocking drill during the preseason. As of press time, opening day is a little more than a week away. Photos/Bobby Begun A receiver hauls in a pass on Aug. 19. The Broncos will look to get back into the postseason this year. A Bronco quarterback tests his arm on the first day of the preseason. The Broncos open up with Valhalla this year.