Much of Kansas and Oklahoma are under Freeze Warnings, with some type of cold-related bulletin covering portions of Arkansas, Missouri, Texas, Nebraska, and Colorado. Below are some forecast lows for tonight. The first image is for the eastern section of the Kansas/Oklahoma Border, while the second image is northeast Kansas.
Lows will dip into the mid 20's and bring a potentially killing freeze to much of the area. All plants must be covered if you want to save them, and ones that are not covered have a very likely chance that they could die from this freeze.