When choosing a ripe avocado at a grocery store, look for a rich green color. Unripe avocados have lighter skin. But please be aware that the color of avocado may not always be the best indicator of its ripeness. Some darker avocados may be perfectly ripe and others may be over-ripened. The color may give you a slight indicator at a first glance and will help you decide for which avocado to reach. A more reliable indicator is an avocado's firmness. Squeeze an avocado slightly with your fingers. If it doesn't give to pressure at all, it will need a few more days before it ripens. An avocado should yield to pressure slightly, yet still feel somewhat firm. If the avocado is soft, it may be too mushy and overripened.