The questions of frost injury on alfalfa (and other forage species) normally come in the fall, with the first or second frost of the fall/winter. What about the impacts of a late spring frost? Low temperatures, whether visible frost is present or not, will influence the growth of established forage plants as well as newly emerged seedlings.
Iowa State University
Barnhart, Stephen K., "Frost injury to alfalfa" (2004). Integrated Crop Management News. 1539.
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