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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.
Make sure each ear still has the husk around it and that it is ripe. Here's how you can check for ripeness: 1  Look for corn with tassels, or strings, that are brown and sticky instead of dry and yellow. Brown, sticky tassels means the corn is ripe.  Squeeze the ear gently to feel the kernels through the husk.