Should I store avocado in the refrigerator or will it make no difference for how long they stay fresh?
Ripening of the avocado is slowed down greatly by refrigeration, so it is usually a good idea to let the avocado ripen fully at room temperature. Once it is ripe, it can be stored in the refrigerator for at least a week. This way, it is ready to use whenever you want it. Fortunately, there is a day or two when the avocado is ripe, but not too ripe, so if you check on it everyday when ripening, you will be able to save it at the correct ripeness without worrying about it too much.
Putting an unripened avocado in the refrigerator may prevent it from ever ripening completely. Once cooled to near freezing (40F in most refrigerators), it seems that some avocados (maybe it depends on the type) don't ripen anymore, even when removed to room temperature.
I store my avocados in my kitchen, uncovered, at room temp until I need them. It is alright to store an avocado in the fridge if you do not intend to use it right away. The cold temperature will inhibit the avocado's ripening. It may need a day or so out on your counter to ripen once it has been removed from the fridge.
If it is already perfectly ripe I would use it asap and not store it in the fridge. Also, if you are making guacamole store it in the fridge with the avocado's seed in the same container, it is supposed oxidize (turn black) less/slower.
You can try freezing them, however I've never tried it personally.
Source: Selecting a California Avocado
protected by Community♦ Aug 11 at 3:41
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