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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.
Instructions. Look at the grapes. Ripe white grapes should have a translucent appearance and a slight yellow tint. Ripe red grapes should be dark red in color, with very little color variation in the bunch. Look at the seeds inside your grapes.