Will corn still head in the evening after the heat? Why?

There will be no header this season. Because corn doesn't head in summer.

There is a saying in the countryside: (Corn) doesn't sprout in summer, but it is pulled out and fed to old cows. This means that the corn will never be harvested before it heads in summer.

Corn is a warm crop. During the whole growing period of corn, the requirements for temperature are still relatively high. Generally speaking, the germination temperature of corn seeds should not be lower than 6℃, otherwise, corn seeds may not germinate. However, if the temperature is higher than 6℃ and lower than 10℃, the germination rate of corn seeds will be extremely slow. If corn seeds germinate very slowly and have poor water content, it is difficult for corn to germinate.