The last USDA crop progress report indicates 72% of corn in or past the dent stage with 5% of the corn acres mature and soybean with 26% leaves turning color. Heat unit accumulation has been and continues to be slower than normal resulting in a crop that is not maturing as early as planned. With the 50% probability of a 28oF frost generally being mid- to late-October, there is some concern with a fall frost killing the crop before maturity is reached, especially for corn.
Iowa State University
Licht, Mark A., "How Much Risk of Frost Do You Have?" (2014). Integrated Crop Management News. 861.
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