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The season premiered on [[CBS]] on July 10, 2025.[{{cite magazine|url=https://ew.com/big-brother-27-to-feature-all-new-players-earlier-premiere-longer-episodes-11734229|title=Big Brother 27 to feature all-new players, earlier premiere date, and longer episodes|last=Ross|first=Dalton|date=May 14, 2025|access-date=May 14, 2025|magazine=Entertainment Weekly}}] Thereafter, new episodes are set to air on Sundays, Wednesdays, and Thursdays at 8:00 p.m. [[Eastern Time Zone|eastern time]] (ET), with Wednesday night episodes lasting 90 minutes long. A new companion show—''Big Brother: Unlocked''—will air bi-weekly on Fridays beginning July 25; the show will feature additional footage and behind the scenes content, interviews, and guest analysis from alumni of past seasons.[{{cite web|url=https://variety.com/2025/tv/news/big-brother-season-27-release-date-unlocked-1236396649/|title='Big Brother' Season 27 Sets July Premiere Date, Launches Friday Night 'Unlocked' Segment With Returning All-Stars|last=Minton|first=Matt|date=May 14, 2025|access-date=May 14, 2025|website=Variety}}] |
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The season premiered on [[CBS]] on July 10, 2025.[{{cite magazine|url=https://ew.com/big-brother-27-to-feature-all-new-players-earlier-premiere-longer-episodes-11734229|title=Big Brother 27 to feature all-new players, earlier premiere date, and longer episodes|last=Ross|first=Dalton|date=May 14, 2025|access-date=May 14, 2025|magazine=Entertainment Weekly}}] Thereafter, new episodes aired on Sundays, Wednesdays, and Thursdays at 8:00 p.m. [[Eastern Time Zone|eastern time]] (ET), with Wednesday night episodes lasting 90 minutes long. A new companion show—''Big Brother: Unlocked''— aired bi-weekly on Fridays beginning July 25; the show featured additional footage and behind the scenes content, interviews, and guest analysis from alumni of past seasons.[{{cite web|url=https://variety.com/2025/tv/news/big-brother-season-27-release-date-unlocked-1236396649/|title='Big Brother' Season 27 Sets July Premiere Date, Launches Friday Night 'Unlocked' Segment With Returning All-Stars|last=Minton|first=Matt|date=May 14, 2025|access-date=May 14, 2025|website=Variety}}] |