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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.
Seeds also darken as grapes mature, but the most reliable way to tell if grapes are ripe is to taste a grape from the tip of the cluster where grapes mature last. Early season grapes ripen over a shorter period of time than midseason-and late-ripening grapes.