This is one fruit that truly needs to be perfectly ripe to ensure the best possible flavor and texture - gently squeeze an avocado in the palm of your hand to see if there's a little give. If it's too mushy, it's overripe and should be avoided. You can store avocados at room temperature to ripen if you're buying ahead, but make sure to leave enough time for them to fully ripen - at least two to three days for really solid ones. The extra-creamy Hass is the dark-skinned type that ripens in summer, but you'll find other kinds of avocados throughout the year that are generally larger with smooth green skin.