A can of tomato paste rarely gets used up in one go, most recipes call for a tablespoon or two, which means most of it usually ends up forgotten in the fridge. That habit is where nearly all the real questions about tomato paste come from, not from the paste itself, which is one of the more concentrated, stable tomato products there is.
Does tomato paste go bad?
The short answer: Yes, eventually, but it takes a while, especially unopened. Tomato paste is tomato sauce cooked down further, so it’s more concentrated and holds even less available moisture, which makes it one of the sturdier tomato products in the pantry. An unopened can or tube commonly stays good well past its printed date. Once opened, refrigerated paste is good for about 5 to 7 days, similar to tomato sauce, and freezing small portions is the standard fix for the fact that most recipes only need a spoonful at a time.
This guide covers canned and tubed tomato paste specifically. For the thinner, less concentrated product, see our guide on whether tomato sauce goes bad, and if you’re wondering about the fresh fruit itself, our guides on whether tomatoes go bad and whether tomatoes need to be refrigerated cover that.
Does Tomato Paste Go Bad: At a Glance
Unopened, pantry
Commonly well past the printed date
Opened, refrigerated
About 5 to 7 days in an airtight container
Frozen, portioned
Several months, best for recipe-sized amounts
Dried or hardened surface
Usually just moisture loss, revives with a little water or oil
Home canning it yourself
Needs a paste-specific acidification method, not the same as canning sauce
Key Takeaways
Tomato paste is more concentrated than tomato sauce, cooked down until most of the water is gone, which gives it a real edge in shelf stability once opened and refrigerated.
Because most recipes only need a small amount, freezing leftover paste in tablespoon-sized portions is the single most useful storage habit for this product specifically.
If you can tomato paste at home, the acidification method is genuinely different from canning tomato sauce or whole tomatoes. The National Center for Home Food Preservation’s own tested recipe specifically requires the citric acid to be mixed in before the tomatoes are cooked down into paste, not added to the jar afterward, because that’s the only way to distribute it evenly through such a concentrated product.
A dried, darkened, or slightly hardened surface on paste that’s been sitting in the fridge is usually just moisture loss, not spoilage, and can often be revived by stirring in a small amount of water or oil.
Best-by dates on tomato paste are a quality marker, not a safety cutoff, the same as most shelf-stable tomato products.
Why Tomato Paste Holds Up Even Better Than Sauce
The Mechanism: More Concentration, Less Available Moisture
Tomato paste starts as crushed or pureed tomatoes and is simmered down significantly, often by half or more, before it’s canned or tubed. That conc
