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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.
The flowers are produced at the beginning of the growing season, which is usually sometime in May. Bloom time varies with local climate and the grape variety. After blooming, grapes mature and ripen at different rates, depending on the species, cultivar, and the weather.