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Wait to plant until the soil temperature is right. In general, corn should be planted when soil temperatures are near 50 Â°F. Seed will absorb about 30 percent of its weight in water, and temperature does not affect water imbibition much.ait to plant until the soil temperature is right. In general, corn should be planted when soil temperatures are near 50 Â°F. Seed will absorb about 30 percent of its weight in water, and temperature does not affect water imbibition much.
Let soil temperatures and soil conditions â not the calendar â dictate your planting date. For a map of current soil conditions throughout Iowa, click here. We recommend waiting until soil temperatures in a region reach between 55 and 60 degrees Fahrenheit before you plant soybeans or 50 degrees before you plant corn. Remember, soil temperature for soybean planting is more critical than for corn. The main reason for this is because soybeans can germinate in a soil environment of about 55 degrees Fahrenheit, but if the air temperature after germination hits 28 degrees Fahrenheit or less, the young seedling can be killed with the growing point of the plant right at emergence.