What time of year harvest grapes?

Grapes are typically harvested in the late summer or early fall, when they have reached their full ripeness. The exact timing of the harvest depends on the grape variety and the climate in which it is grown. In general, grapes are harvested when the sugar content of the fruit has reached its peak and the acidity has decreased. This can be determined by measuring the brix level of the grapes, which is a measure of the sugar content.