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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.
Sweetness. Grapes become sweeter and less acidic as they mature, which is the most important factor in determining if grapes are ripe. The sweetness of the grapes also depends on the cultivar planted and growing conditions. Sometimes, a cluster of grapes will ripen unevenly.