Yes, it's that time of the year when grapes are turning color and homeowners are thinking about when their grapes will be harvested. But many homeowners think that when the color turns, the grapes are ready to eat. They pick a few colored berries and pop them in their mouths only to find that there is very little flavor and a puckering feeling hits their pallets.
Just because the color has turned on your grapes, it doesn't mean they're ripe. Generally speaking, grapes need one to three weeks after turning color to be considered ripe for harvest. But this time frame is dependent upon many factors including the variety, what the grapes are to be used for, and environmental conditions like the weather.