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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.
Other Indicators of Ripeness. The most reliable way to tell if grapes are ripe is to taste them for sweetness. Size and appearance also indicate maturity. As grapes ripen, their color changes from green to red, blue, white or purple. The grapes may develop a characteristic white bloom, which looks like a light powdery coating. They become large and slightly less firm. The seeds of table grapes turn from green to brown.