Hi Kath,acording to Ray Mears crab apples are a bit on the sour side just eaten as they are, but if you cook them they,re supposed be nice and sweet check out his book "Bushcraft". if they,re red i would imagine they would be ready,i suppose the best way to find out is have a bite and see but i,m guessing they,ll be quite tart to the taste.I have noticed that everything seems to be a bit early this year, i,ve found field mushrooms already up here and we don,t usually see them until september,i,m putting it down to the warm spell in the spring and then all this wet weather we,ve had of late.