Pantry Staples

Tomato Paste: Storage & Shelf Life

Opened tomato paste shares canned tomato sauce's 5-7 day fridge window, though because paste is used in such small quantities per recipe, freezing leftover portions (3 months) is an especially practical habit here — arguably more useful for tomato paste than for almost any other opened canned product on this site, given how rarely a full can gets used in one sitting.

Freezing tomato paste in tablespoon-sized portions, commonly done with an ice cube tray, sidesteps the common kitchen situation of most of a can going unused and eventually spoiling in the fridge before it's needed again.

Because tomato paste is so concentrated, it also freezes with minimal texture change compared to a higher-water-content product — there's simply less water left to form disruptive ice crystals, similar to how honey's low water content protects it from most freezing-related texture problems, though for a fundamentally different underlying reason.

A tube resealed tightly after each use limits air exposure far better than a can, which is part of why some cooks specifically prefer the tube format.

Freezing leftover paste in an ice cube tray, then transferring the frozen cubes to a bag, is the single most useful storage habit for this ingredient.

Tomato paste's high acidity can interact with an opened can's exposed metal edge over several days, so scraping the remainder into a small airtight container is worth the minute it takes.

Tomato paste's concentrated acidity slows spoilage considerably once opened, but a fermented smell, off color, or any surface mold still means the jar or can is done, not a spot to scrape away.

A thin film of oil spooned over the surface of leftover paste before sealing the container, an old trick some cooks use, adds a small extra barrier against air on top of a tight lid.

Because a recipe rarely calls for a whole small can at once, tomato paste is one of the more commonly wasted pantry staples — freezing the leftover portion in small measured spoonfuls is worth the minute it takes to avoid that waste.