Chicago Fire is set to lose one of its original cast members. During Season 1, he appeared as a recurring cast member before becoming a series regular in Season 2. (Photo Credit: NBC)When is Chicago Fire Season 15 premiering on NBC? Now, the series is gearing up for Season 15, which is scheduled to premiere on NBC on October 7, 2026. Season 15 of Chicago Fire will also feature a new executive producer, Victor Teran, who replaces Andrea Newman after 14 seasons.