Have you ever seen such large grapes?!  When mother brought them home from the produce market, my first reaction was to cry, grapes on steroids!  But, after some tootling around the web, I came across a list of grapes that grow in California.  They’re probably the Autumn King grape.  From what I’ve gleaned, it seems this variety started appearing in 2006, grows in Fresno/central California, and is available from September – November.