8. Ready whether you are or not.
One website states: “The period of peak freshness for sweet corn is measured in minutes, not hours or days.” You can estimate that your corn will be ready to harvest about 20 days after the silk appears. Around that time, keep an eye on it; pull back the husk and check the kernels each day. They should be smooth and fat and the juice should be milky when you puncture a kernel with your fingernail. If you harvest too early, the juice will be watery. If you harvest too late, the kernels will be tough and doughy. If you can’t eat it the same day, refrigerate it immediately and eat within a couple of days.