You might think that Queen’s Line off Drake Road, Chatham, ON N7M 5T1, Canada is the furthest north that rice grows in the world. That’s near Lake Erie, after all.
But you’d be wrong, and so was I. The latitude is 42°19’59.7″N. And there’s rice cultivation in China and central Asia, maybe even Italy’s Po valley, north of the 45th parallel, according to this map.1
We know the furthest south that rice is grown.