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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.
A grape's sweetness and flavor is the true test for maturity. Ripe grapes should taste sweet, flavorful and mildly acidic. Tart grapes need more time to ripen. Consider weather patterns as you determine harvest time. If the grapes are near maturity, pick them if heavy rains are imminent.