How do you know when a melogold is ripe?
Keeping this in consideration, how do you know when grapefruit is ripe?
It should feel plump and heavy, as if it's about to burst with sweet grapefruit juice. In general, ripe citrus will have smooth, thin skin. Give the grapefruit a nice squeeze to see if it's firm. Firm all the way around is a good sign.
Regarding this, what color is a ripe grapefruit?
Oranges do not ripen after being picked; they must remain on the tree to develop sweetness, which can take months. Valencia orange types may shift back toward a green color after turning orange and before ripening. Navel oranges generally turn orange while still tart and acidic, long before they are ready to harvest.