How long does smoked salmon last in the fridge?

The short version: an unopened, vacuum-sealed pack of smoked salmon is genuinely a use-by item and the printed date on it is worth trusting, often two to four weeks from the day it was packed. Once you open it, that date stops applying. From the day the seal is broken, both cold-smoked and hot-smoked salmon are best treated as good for about three to five days — closer to the rules for fresh fish than to the "it's cured, so it basically keeps forever" assumption a lot of people bring to it.

Why "smoked" does not mean "cooked"

There are two genuinely different products sold as smoked salmon, and the difference matters more than the name suggests. Cold-smoked salmon — the silky, translucent style often labelled Nova or lox — is smoked at a low enough temperature that the fish is never actually cooked through. What preserves it is the salt cure that happens before smoking, plus the smoke itself, not heat. The texture stays essentially raw, which is exactly what people are buying it for, but it also means it does not get the safety margin that cooking gives food. This is why official food-safety guidance in several countries specifically calls out refrigerated cold-smoked and cured fish as a category worth extra care around, and why it is commonly on the shorter list of foods people who are pregnant or otherwise more vulnerable to foodborne illness are advised to avoid unless it has been cooked into a hot dish.

Hot-smoked salmon is a different thing entirely. It is smoked at a high enough temperature to cook the fish through, which is why it flakes like baked salmon rather than slicing like ham. Because it has actually been cooked, it behaves more like other cooked fish once opened, though the three-to-five-day window after opening still applies as a sensible default for both styles — the cure and smoke slow things down a little, but they do not reset the clock the way genuine cooking plus refrigeration does for something like a roast chicken.

Two different clocks: sealed and opened

This is the same pattern that shows up with milk, cheese and deli meat, and it applies here just as strongly. The printed date on a vacuum-sealed pack describes a product with no air inside it and no exposure to your kitchen — smoked salmon's shelf life owes a lot to that airtight seal, since it is what keeps oxygen and airborne bacteria away from a product that is not sterile, only cured and smoked. The moment you open the pack, both of those protections are gone, and the countdown that matters from then on is the day you opened it, not the day printed on the label. A pack with three weeks left on its use-by date does not mean three weeks once it is open; it means about three to five days, whichever comes first against the printed date.

What actually shortens it once it is open

How it is resealed. Pressing the original packaging as flat as possible to push out air, or wrapping the salmon tightly in fresh cling film or foil against the flesh itself, does more than a loosely folded bag. Air is the main thing accelerating both bacterial growth and the fat in the fish turning rancid, since salmon is an oily fish.

Where it sits in the fridge. The coldest part — usually the back of a lower shelf, not the door — matters more for smoked salmon than for a lot of other opened items, because it is already living close to the edge of its safe window even sealed.

Whether it came vacuum-packed or from a counter. Salmon sliced fresh at a deli or fish counter and wrapped in ordinary paper never had the extended, sealed shelf life a vacuum pack gives — it is closer to fresh fish from the moment you buy it, and the three-to-five-day opened window is really the only window it ever had.

Freezing extends it, with a texture trade-off

Smoked salmon freezes reasonably well, typically for around two to three months, and it is a genuine option if you are not going to get through a pack in time. The trade-off is texture rather than safety: the delicate, silky bite of cold-smoked salmon in particular softens and can turn slightly watery once thawed, since freezing ruptures some of the cell structure that gave it that texture in the first place. It is still good folded into scrambled eggs, a pasta sauce, or a spread, even if it is less ideal served cold and sliced the way it was meant to be eaten straight from the pack.

Signs it has turned

Cured, smoked fish has a distinct baseline smell and texture, which is exactly what makes it a little harder to judge than plain fish — the normal smoky, briny smell can mask early signs. A few things are worth checking specifically rather than relying on a quick sniff alone.

• Smell for sour or ammonia notes underneath the smoke. That sharper, less clean smell sitting behind the usual smoky one is the more reliable signal than the smoky smell itself, which stays strong even as the fish turns.
• Texture that has gone slick or tacky beyond its normal moist cure. Cold-smoked salmon is naturally a little glossy; a film that feels distinctly slimy rather than just moist is different from that.
• Colour dulling from bright pink or orange toward a greyish tone. This tends to show up gradually and is worth checking under good light rather than the inside of a fridge.

Because the normal product can seem mild even when it is past its best, this is one of the cases where the printed date deserves more weight than your nose alone — treat it closer to a use-by item than a best-before one, and lean on the date rather than overriding it on the strength of a smell that still seems fine.

What actually makes this easy

• Trust the sealed date, distrust it the moment the pack is open. Those are two different pieces of information, and conflating them is where most of the guesswork comes from.
• Write down the day you opened it. Three to five days from that day is a number you can actually act on; a use-by date printed for a sealed pack is not.
• Reseal tightly and keep it on the coldest shelf. This buys more real time here than for most other opened foods, because the margin is already thin.
• Freeze early if it will not be finished in time. There is no cost to freezing on day two; there is real cost to deciding on day five.

This is close to what Munch's opened-item tracking is built for: marking a pack opened starts its own shorter countdown from that day, separate from the use-by date printed on the sealed pack, visible to everyone in the household rather than only to whoever opened it for Sunday brunch — so a pack that still shows two weeks on the label does not quietly get treated as having two weeks left once it has actually been open for four days.

None of this needs remembering which style is which every time. It needs one habit — note the day the seal came off, and treat that as the date that actually governs what happens next, whichever kind of smoked salmon it is.