PalmsNorth.com

Stumbled over this.... West Coast with higher increases.

"The update is based on plant hardiness maps originally developed by Agriculture Canada and the U.S. Department of Agriculture. They compared the data used for the original zones and maps from the 1931 to 1960 period with more recent observations used for the 1981 to 2010 indexing of plant hardiness."

This is a quick read.

http://gardenmaking.com/plant-hardiness-zones-changing/

Here on the northern Oregon coast, we've been moved from zone 8 to 9.

But, got to zone 8 temps in December 2013.

I'll still take risks, but every few years, or decades, watch out.