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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.
If you see birds on the vines, it is a good guide to ripeness. Once grapes have been picked, they will not ripen further. Therefore, wait until your crop is fully mature, then harvest by clipping off the bunches with scissors or a sharp knife. Pick them on a dry day because wet grapes do not keep as well.