You can get by planting in colder conditions. In 2009, the neighbors corn took nearly a month to emerge from the ground. But there is a potential price to be paid if the seedling gets chilled. Assuming planting conditions are ok at the time the seed is put in the ground, I think the biggest danger comes in the first 24 hours after planting when a cold rain could chill the seed, resulting in stunted plants and an uneven stand.
I'm not big on replanting, so the soil needs to be around 50 degrees with decent temperatures in the forecast before we roll here. But as the saying goes, "you have to get started early if your going to do it twice."
I think we will be planting later than average in this area based upon current conditions and the forecast.
