Answer the following question, with explanation first.
The fourth season of the American political drama series Madam Secretary premiered on October 8, 2017, on CBS in the United States. It is produced by CBS Television Studios, and Revelations Entertainment with series creator Barbara Hall serving as executive producer, alongside Morgan Freeman, Lori McCreary, and Tracy Mercer.\n\nWhen does the season for madam secretary start?

October 8 , 2017
The relevant sentence in the passage is: The fourth season of the American political drama series Madam Secretary premiered on October 8, 2017, on CBS in the United States.

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Final answer: October 8 , 2017