The tempature was in the 60's last weekend here in Nebraska-There is hardly any frost left in the ground. The lake here is not even completely froze over.
This area of Nebraska AVERAGES @ 40 inches of frost depth in the winter. https://www.hammerpedia.com/frost-line-map/ And we are historically at the coldest part of winter. I'm going to rely on my Soil's degree in Agronomy and over 35 years of experience in dealing with Nebraska soils, not someones opinions. Like everyone keeps saying on here....do your own DD, Don't take my word for it.