Fort Mason Center Farmers' Market (map) Fort Mason Center, Bldg. D San Francisco, CA, 94109 United States ✚ gCal ✚ iCal CELEBRATE THE PEAK SEASON OF GRAPES! Vote for the Most Beautiful Bunch of Grapes! Guess how many grapes are in the GIANT BUNCH for a chance to win $50.00Learn about your favorite varieties of grapes like Muscats, Red Flame, Princess, and Thompson!