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The color of the vine also indicates when to harvest Concord grapes. Throughout the growing season, the vine and stems are a light to medium green. When the vine and stems begin to turn to a light then medium brown, it means the grapes are ripening and ready to harvest.
Picking the Berries. Cranberry fruits should be harvested after they turn red and before the first hard frost, which generally occurs in September to mid-October in many U.S. locations. Break open a few of the fruits first to verify that their seeds are brown, which indicates that the berries are ripe. Then the fruits can be picked by hand.