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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 first thing you need to know is when the apples are ripe. Not all varieties ripen at the same time. Here in Zone 5, the earliest apples like 'Lodi' may be ready to pick in July, while 'Granny Smith' doesn't ripen until November. So it's important to know what varieties you are growing and what they are supposed to look like when ripe.