Killing Freeze Affects Alfalfa, Sorghum/Sudangrass Grazing Oct 29, 2018 by Ellen Crawford, NDSU Extension Service Eating alfalfa, sorghum-sudangrass and sudangrass right after a killing freeze can cause health problems in cattle.
Winter Grazing Stockpiled Forages and Frost Seeding Feb 01, 2019 by Victor Shelton, Natural Resources Conservation Service If the pasture of stockpile is heavy, then it can often be grazed even under fairly wet conditions without too much long-term damage but, you will need to have a watchful eye.