See the status box below for the most up to date return date info for Season 19 of Big Brother:
LATEST SHOW STATUS
Big Brother Renewed for Season 19 By CBS
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About Big Brother
CBS has renewed Big Brother for Seasons 19 and 20 in addition to an online only season which will stream on CBS All Access from September 2016. The All Access online season is not currently included in CBS overall season numbering.
As above, Season 19 released June 28, 2017 on CBS, with Season 20 airing summer 2018, also on CBS.Source