A deck curtain and mounting system using vertical posts attachable to a deck rail or decking to form a structure supporting curtains hung from cross members positioned between the vertical posts to surround or encompass a deck area. The method of shading or securing the privacy of a deck area includes attaching vertical posts to a rail cap of a deck structure surrounding a deck area and attaching rotatable horizontal connectors to the vertical posts so that cross members may be connected between the vertical posts for hanging privacy curtains from the cross members around the deck structure.