I think you're kidding, but this has already happened in North Dakota: http://www.npr.org/sections/thesalt/2014/08/13/340116405/shifting-climate-has-north-dakot

I think you're kidding, but this has already happened in North Dakota: http://www.npr.org/sections/thesalt/2014/08/13/340116405/shifting-climate-has-north-dakota-farmers-swapping-wheat-for-corn http://www.npr.org/sections/thesalt/2014/08/13/340116405/shi... The story leads with climate changes, but other reasons include corn varieties that have shorter growing seasons. According to the query tool (https://quickstats.nass.usda.gov https://quickstats.nass.usda.gov), corn acreage in ND has gone from 1.0M acres in 2000 to 3.7M this year.