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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.
Apples on the sunny side, usually the southern side, of the tree ripen first. How to know when apples are ripe: Days from bloom: The most accurate method is to count the number of days since the tree bloomed in the Spring. Each variety of apple has a specific number of days to reach it's optimum ripeness.