Frost damage depends on corn growth stage, frost severity, U of M expert says
ST. PAUL -- Much of Minnesota's corn crop was damaged by frost on the morning of Sept. 15, according to University of Minnesota Extension corn agronomist Jeff Coulter.
For corn, a killing freeze occurs when temperatures are 32 degrees for four hours or 28 degrees for just minutes. But according to Coulter, "A frost or killing freeze can still occur above 32 degrees, especially in low and unprotected areas when there is no wind."
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