Does this question appear to be a simple one? Think again, the answer will be pretty straight forward till you decide how or where you store the tangy puree. The controversial part of it comes to the preference of storing this famous condiment that goes well with most cuisines. Recently netizens engaged on twitter war whether to store it in the fridge or pantry. Either way, I am sure you would indulge in the involuntary act of sniffing it before you use it. So how long does tomato sauce last without or without a refrigerator? It is one thing that you cannot say unless we know how you store the ketchup. We shall give you cues on how long it might last if you put in the refrigerator or on the shelf.