And if you are going to use these maps, be advised that 23 years of climate change have been occurring. I wish that they had used this map, which at least shows the changes up to 2006.
Bottom line to all this is that climate zones are moving north, along with the range of plant species. Don't think "drat, I'm too far north for this plant", instead think "with a little bit of help, this plant is going to move north into my area".
That is, if the plants get enough water. Besides the warming aspect of climate change, there is the increased variability of precipitation -- longer droughts, and more floods in between them.