How long does opened chicken broth last in the fridge?

Opened chicken broth or stock, kept cold in the fridge, is generally good for about three to four days — a store-bought carton or can that has been opened is usually fine toward the upper end of that range, homemade stock a little closer to the lower end. That is a far narrower window than most people expect, because a sealed carton of broth sits on the shelf like tinned tomatoes or dried pasta right up until the moment you open it, and nothing about the packaging warns you that a completely different clock starts then.

Why the carton stops helping the moment it is open

A shelf-stable carton of broth has been heat-processed and sealed in a way that lets it sit at room temperature, unopened, for months — the same aseptic packaging used for shelf-stable plant milks. That protection belongs entirely to the sealed package, not to broth as a food. Break the seal and it is gone for good, and broth is a poor thing to be left unprotected: it is watery, close to neutral in acidity, and rich in exactly the protein and fat that bacteria use well. None of the traits that make a fermented, salted paste like miso comparatively forgiving once opened apply here. Once it is open, chicken broth has more in common with milk than with a condiment, and it should be treated that way.

Homemade stock is not a slower version of the same thing

It is tempting to assume homemade stock, simmered for hours, must keep at least as well as the store-bought kind. It does not, and the reason is really about processing rather than effort. A carton went through a sealed, sterilising heat treatment specifically so it could sit unopened for months; homemade stock was heated once, when it was made, in an open pot, and picked up whatever was in the kitchen air while it cooled. From the moment either one is opened or made, they are on essentially the same clock. Homemade stock does not get a longer window for having been made with care — if anything, cool it and get it into the fridge promptly, since a large pot left to cool slowly on the stove or counter spends longer than it should in the temperature range where bacteria grow fastest. Splitting a big batch into smaller, shallower containers before refrigerating helps it cool through that range quickly rather than staying warm at the centre for hours.

What is a normal change, and what is spoilage

Broth changes in ways that look alarming but are not, and a couple of signs that genuinely mean it is time to throw it out.

• A solid layer of fat on top when cold. Normal, and actually a sign of a well-made stock. It can be skimmed off or left in place and remelted when reheated.
• Cloudiness or a gel-like set in homemade stock. Collagen from bones and connective tissue sets into a wobbly gel when chilled and turns back to liquid once heated. This is what a good stock is supposed to do, not a fault.
• A sour, distinctly off smell, different from the usual savoury, meaty aroma. This is the clearest single warning sign.
• Sliminess, a stringy texture, or fizzing and small bubbles when the container is opened, which point to fermentation rather than the normal settling described above.
• Any mould, whether on the surface of a pot of stock or gathered around the spout of an opened carton, where repeated pouring leaves moisture behind.

The freezer, not the fridge, is where most of it belongs

Broth is rarely used up in one go — a recipe calls for a cup, and the rest of a carton or a pot sits in the fridge with three or four days to be used before it is gone either way. Freezing sidesteps that pressure rather than just delaying it. Small portions in an ice cube tray or a muffin tin, frozen solid and then tipped into a bag, cover the splash needed for deglazing a pan or loosening a sauce; larger portions frozen flat in a bag or a container suit soup or risotto. Frozen this way, broth holds its quality well for months, and a recipe that needs it needs one portion straight from the freezer rather than a decision about whether the carton in the fridge is still good.

The everyday failure with broth is rarely about knowing the four-day window — it is that a carton opened for one recipe gets pushed to the back of a shelf once the immediate dish is done, and by the time anyone reaches for it again, three or four days have quietly become ten. This is close to the gap Munch's opened-item tracking is built for: a carton or a batch of homemade stock keeps its own storage location and its own printed date, but marking it opened starts a separate, shorter countdown from that day, visible to everyone in the household — so the half-used carton at the back of the fridge is something somebody is actually reminded to use, rather than something only the person who opened it might remember.

None of this needs to be exact. A broth that still smells like broth — savoury, maybe fatty on top, with nothing sour or fizzy about it — is doing what it is supposed to. The number on the carton describes the sealed box; the day you opened it, or the day you made the pot, is the one that actually matters from here.