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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.
Nettlerose, we have the same problem here. Trial and error. If the apples are not supposed to be ripe until May, give them more time. We have a Granny Smith here which looks ready, too, but that's very deceiving. If you must, take the apple in your hand and give it a little tug. If it doesn't come off, it's not ready.