How long does opened ricotta last in the fridge?

The short version: an opened tub of ricotta, kept sealed and properly refrigerated, is usually good for about five to seven days, often nearer the shorter end if it is the fresh, deli-style kind rather than a shelf-stable supermarket tub. Ricotta is a fresh whey cheese with none of the ageing, salting or pressing that gives other cheeses months of slack, so from the moment the tub is opened it behaves a lot more like an opened dairy product than like "cheese" in the drawer sense of the word.

Why it doesn't behave like the cheese next to it in the fridge

Most cheeses that keep for weeks or months earned that shelf life by losing water — pressed into a firm block, salted, sometimes rinded, then aged until very little moisture is left for anything to grow in. Ricotta skips essentially all of that. It is made by heating leftover whey until soft curds form, then draining them briefly — no pressing, no ageing, barely any salting. What lands in the tub is a fresh, high-moisture curd with a mild, faintly sweet flavour and no structural barrier standing between that moisture and whatever wants to spoil it. That is the whole reason a wedge of parmesan and a tub of ricotta, sitting on the same shelf, run on completely different clocks.

Fresh deli ricotta vs. the sealed supermarket tub

Not all ricotta is the same product once it is open. A tub bought sealed in the refrigerated aisle is the version most food-safety guidance has in mind when it gives that five-to-seven-day figure. Fresh ricotta from an Italian deli, or made in small batches — softer, wetter, often sold loose or in a perforated basket rather than a sealed tub — has had less processing working in its favour and is worth treating more cautiously, closer to three or four days. Neither kind is more "real" ricotta than the other; they simply start from different points on the same moisture-and-processing scale that decides every cheese's shelf life on this site.

The liquid on top is not a warning sign

Almost every tub develops a shallow pool of watery liquid within a day or two of being opened. That is whey again — the same liquid the curds were made from, separating back out as the tub sits — and it is completely normal. Stirring it back through the curds, or pouring it off, does not shorten how long the ricotta is good for. What is worth noticing is a change in the liquid itself: if it turns cloudy or stringy, or starts to smell distinctly sour rather than just faintly milky, that is a different signal from the ordinary pooling and should not be ignored.

What actually shortens the window

Ricotta is almost never eaten a spoonful at a time straight from the tub — it gets folded into a lasagna, piped into shells, beaten with eggs and sugar for a cheesecake, or spread on toast with honey — and the biggest variable is what happens to the rest after that one recipe is made. A spoon dipped in and out over several days introduces more each time than a lid that goes straight back on and stays there. Leaving the tub out on the counter while the rest of dinner comes together costs it more time than people expect; a soft, wet cheese with barely a week of slack does not have much slack to spare for free.

What actually signals it is done

Trust smell and texture over the date on the lid. A sharp, sour tang beyond ricotta's normal mild sweetness, a slimy rather than soft-crumbly texture, a yellowish tinge, or any visible mould are all reasons to stop. Because ricotta is soft and wet all the way through, there is no version of trimming a spot of mould and eating the rest — the same rule that applies to cottage cheese, cream cheese and other high-moisture cheeses applies here: if mould shows up anywhere in the tub, the whole tub goes, not just the visible patch.

Freezing works, but only for cooking

Ricotta freezes, but it does not come back the way it went in. Ice crystals rupture the soft curd structure, so on thawing it releases noticeably more liquid and turns grainier than fresh ricotta. Eaten plain or spread on something, that texture change is obvious. Folded into a lasagna, baked into stuffed shells, or beaten into a batter that gets baked anyway, the change mostly disappears into the finished dish. A tub heading for the freezer is a tub heading toward the oven eventually, not a spoon.

Why the second half of the tub is the part that goes to waste

Ricotta tends to get bought for one specific dish, used in the exact amount that dish needed, and then the remaining half-tub sits in the same spot with nothing on the outside to say when it was opened. Unlike a wilting vegetable, it gives almost no visible warning as it approaches the end of its window, so the moment someone actually opens the lid to check tends to be the same moment they are deciding whether to use it — the worst possible moment to be guessing from memory alone.

This is close to what Munch's opened-item tracking is built for: marking the tub as opened starts its own countdown from that day, visible to everyone in the household rather than only to whoever made the lasagna, so the half-tub at the back of the shelf is not resting on a guess about which Sunday it was opened.

Ricotta does not need a rule of its own to remember. It is a fresh, wet, unaged cheese with almost nothing preserving it: keep the lid sealed, keep it cold, and treat a spot of mould the way you would on any soft cheese — the whole tub, not just the spot.