How long does fresh ginger last in the fridge?

The short version: a whole, unpeeled knob of ginger kept in the fridge, ideally wrapped, is usually good for three to four weeks — noticeably longer than most of the produce sharing the crisper drawer with it. What eventually finishes it off is not really spoilage in the bacterial sense that governs most of this site. It is moisture loss. Ginger is a rhizome, a thick underground stem built to store water and starch, and once it is out of the ground its whole trajectory is a slow leak of that moisture until it goes soft, wrinkled and eventually mouldy at the cut end.

Why it dries out instead of rotting

Fresh ginger has a tough, papery skin that does a reasonable job of holding moisture in, which is exactly why the skin is worth leaving on for as long as possible. The problem starts the moment that skin is broken — at the point where it was snapped off a larger piece, or wherever you have already sliced into it. That cut surface has no protective skin at all, so it is the fastest route for water to leave and for mould to get a foothold, usually showing up first as a soft, slightly translucent patch right at the cut, well before the rest of the knob shows any sign of trouble.

This is a different failure mode from a wilting leafy green losing structure across its whole surface, or milk souring uniformly through the carton. Ginger fails from one specific point outward, which is also why it can look completely fine at a glance while the cut end underneath is already going. Checking it means looking at that end specifically, not just at the knob as a whole.

What actually slows it down

Leave the skin on. Peeling exposes fresh surface to the air across the whole piece, not just one cut end, and a peeled knob dries out and starts spotting noticeably faster than an unpeeled one. Peel only what you are about to use.

Keep it dry, then wrap it. Damp ginger left loose in a drawer is more likely to grow mould than dry ginger left in the open air. A paper towel wrapped around the knob and then a loose plastic bag or container works well — the paper absorbs any moisture that does escape instead of letting it pool against the skin, while the bag slows the drying out that would otherwise finish the knob off from the outside in.

The crisper drawer, not the door. Same logic as almost everything else in the fridge: the door runs warmest and swings through the widest temperature range every time it opens, and ginger has no urgent safety reason to be there for easy access.

Cut end down, or cover it. Once a piece has been broken or sliced, that exposed face is the weak point. Pressing the cut side onto a small piece of plastic wrap, or standing the piece cut-side-down against the wrapping, slows the moisture loss and mould growth that would otherwise start right there first.

What actually tells you it is done

A little softening near the very edge or a papery, slightly wrinkled skin is not a reason to throw a whole knob out — trim that end off and the rest is usually still perfectly good, sliced or grated. What does mean it is finished: mould, which on ginger tends to show as a fuzzy grey-green or white patch rather than the harmless dark discolouration a cut edge sometimes gets; a piece that has gone soft and squishy all the way through rather than just at one end; or a smell that has turned sour or off rather than the sharp, peppery scent fresh ginger normally has. As with any mould on a moist food, the safer move is to treat the whole piece as done rather than try to cut around it — unlike a hard cheese, ginger's high water content means mould can be established well beyond what is visible on the surface.

Why the freezer is arguably the better home for it

Most people buy far more ginger than a single recipe needs, because it rarely comes in a smaller size, and then watch the rest slowly dry out over the following weeks. The freezer sidesteps that entirely. A whole knob of ginger can go into the freezer unpeeled, in a bag, and keeps well for months — and unlike most frozen produce, it does not need thawing before use. Frozen ginger grates directly on a box grater or microplane, skin and all, straight from frozen, which is arguably more convenient than wrestling with a soft, room-temperature knob and a peeler. The texture is only ever meant for cooking into something anyway, so the slight softening freezing causes is not something you would notice in a stir-fry or a broth the way you would in a dish where ginger is eaten raw.

Sliced or grated portions frozen individually on a tray, then bagged, work the same way and mean a recipe that calls for a teaspoon of grated ginger never has to start with peeling a whole knob.

The part that is easy to lose track of

Ginger's whole failure mode — slow, invisible, starting from a hidden cut end — is exactly the kind of thing that gets missed. It does not smell up the fridge like spoiled meat or turn an obvious colour like a wilting lettuce leaf; it just sits at the back of the drawer looking roughly the same for weeks until the day it is needed, at which point the good two-thirds and the shrivelled, spotted end are both a surprise. Munch's inventory is built for exactly this kind of item: a knob of ginger logged with a rough sense of when it was bought is one less thing depending on memory of a shopping trip from three weeks ago, and one more thing that actually gets used before it needs trimming down to almost nothing.

None of this needs to be complicated. Leave the skin on until you need it, keep the cut end covered, and when in doubt, put the rest in the freezer rather than betting on the crisper drawer to hold it for another month.