The 6 Jan 1923 Camera reported that novelist William Dudley Pelley, who wrote The Fog, was in consultation in San Francisco, CA, with Max and Louis Graf about locations being filmed there. Principal photography was set to begin in mid Jan 1923 at the Pacific Studios in San Mateo, CA, as soon as H. H. Van Loan finished the scenario. However, according to the 10 Feb 1923 Camera, filming would not start until later that month.
       Agnes Kerr Crawford’s “Flashes from Frisco” column in the 10 Feb 1923 Camera announced that cameraman John Arnold was “taking the screen tests at the Loew-Warfield Theatre” in San Francisco. Work was set to begin “at the Pacific Studios in a week.” More than a month later, the same column, in the 24 March 1923 Camera, reported: “One of the largest and most elaborate scenes of ‘The Fog’ was shot last Wednesday, when the play within a play was filmed. The story calls for the giving of a plart of ‘Mid-Summer Night’s Dream,’ and it was shot in a leafy glade on one of San Mateo’s largest and most beautiful estates. The audience quite forgot it was March and that somewhere it was snowing, and were almost carried back to the forest of Arden, so lovely were Titania, Puck, and the fares in their wisps of gauze, dancing on a flower-strewn lawn under giant oak trees. The same audience who appeared before the camera included many names well known to San Francisco society.” The same item mentioned that Edward Phillips had finished his part and would soon drive home to Hollywood, accompanied by acting newcomer George Reilly, who had played a small part in the movie.
       According to the 31 Mar 1923 Camera, the company had just finished its fifth week of work at Pacific Studios and expected to finish shooting “in one more week.”
       Miss Crawford reported in the 7 Apr 1923 Camera that the company “spent several days at Santa Cruz last week, staging the big train wreck which is one of the dramatic moments in the picture. The actually shooting of ‘The Fog’ will be completed within the next few days.” The film was finally “finished on Thursday [12 Apr 1923], after a little more than seven weeks’ work,” and director Paul Powell had begun editing, according to the 14 Apr 1923 Camera.
       An item in the 18 Aug 1923 Camera reported that when The Fog opened that week at an Oakland theater, the three children of the cast—Oliver Hyde, Rose Cugini, and Grace Johnson—performed a playlet as part of the film’s prologue.