The record low temperatures last Monday, May 2, have caused significant damage to corn plants and early-planted soybeans in Iowa. It also affected a few of the sentinel plots in which plants emerged early. Plants in seven plots emerged before the freeze, and we were able to protect some by covering them with plastic sheets. Our collaborators at the West Central Coop at Jefferson protected their sentinel plot with hay. However, two plots were frozen and were immediately replanted last week.