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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.
Deep green grapes are not yet ripe. All grapes (Vitis spp.) become sweeter as they mature, although sweetness varies, depending on the cultivar and growing conditions. Table grapes are generally sweeter than juice grapes, for example.