The premiere of Big Brother 21 will have a two-night premiere event Tuesday, June 25 and Wednesday, June 26 (8:00-9:00 PM, ET/PT).
As usual Big Brother will have three weekly episodes. Following the premiere, it will be broadcast Wednesday, June 26 (8:00-9:00 PM, ET/PT) and Sunday, June 30 (8:00-9:00 PM, ET/PT). Starting Wednesday, July 10, the show moves to Wednesdays & Thursdays (9:00-10:00 PM) with the Sunday broadcast remaining at 8:00pm.