this isnt just 1 night of extreme cold ....then moderating. some areas with bare ground will see several sub zero nights in a row.  nw.ks, for instance.  this will allow the killing cold to penetrate very deeply in the soil profile.

Lows days 3-7 below:

NorthCentral plunges into the DEEEEEEEP freeze!!! MUCH below ZERO!

https://www.wpc.ncep.noaa.gov/medr/medr_min.shtml

there is no snow cover. some of ne has a nice protective snowpack but not so farther south.

https://weatherstreet.com/weather-forecast/Snow-Depth-US.htm

U.S. Snow Depth and Snow Accumulation - Weather Street U.S. Snow Depth and Snow Accumulation. for LOCAL WEATHER: additional OPTIONS: City, ST-or- ZIP code-or- ST radar-or- snow-or- map weatherstreet.com

some of those areas ....depicted below have low soil moisture so the cold will penetrate and the crop did not get well established in the fall. dry soil warms up and cools off up to 6 times faster than moist soil.

https://www.cpc.ncep.noaa.gov/products/Soilmst_Monitoring/US/Soilmst/Soilmst.shtml#

however, just before the coldest air is scheduled to arrive, a huge snow storm will develop in the s.plains.

i totally overlooked something in that last email.

theres some massive snow on the way, possibly alot for those areas most at risk just before the coldest air arrives.

from the european model ensemble

here are some individual solutions for snow on sunday

the 2nd batch is snow on monday forecast

the 3rd batch is snow forecast on tuesday