How long doesPolentalast in the fridge once opened?
The USDA rates 2 kinds of this separately
The USDA files 2 separate entries under this name — shelf-stable and frozen — and they do not keep for the same time: Polenta, frozen holds 5 days outside the freezer, Polenta, shelf-stable holds 5 days to 7 days. Comparisons and the place in the category are computed for Polenta, shelf-stable, which is the kind the plain name means here, chosen kind by kind rather than by the order the source happens to list them in.
The edge of its own category
Polenta, shelf-stable is the shortest-lived entry in the Shelf Stable Foods list: 7 days outside the freezer, against 4 weeks for Roasted nuts (peanuts, cashews, almonds), the item immediately above it. All 69 of the others keep longer.
Every storage figure the USDA publishes for this item
The USDA gives this item no pantry time in days: the 3 figures that carry numbers are all cold ones, and the pantry slot is answered in words instead. The source also indexes it as shelf stable and frozen.
Polenta, shelf-stable
- In the freezernot recommended
- In the pantryPackage use-by date
- Once opened · in the fridge5 days to 7 days
Polenta, frozen
- In the freezer12 months
- Once thawed · in the fridge5 days
Where the USDA answers in words instead of days
1 of the nine slots the USDA keeps for this item holds an answer that is not a number, and an answer in words is still an answer: in the pantry it answers with the package date rather than a number, and the use-by date printed on that particular package is the figure to go by.
Turning the range into a date
Each kind gets its own dated rows here, 3 rows across the 2 the USDA lists under this name, because a date is only worth printing against the window it belongs to.
Polenta, shelf-stable
- Once opened · in the fridgeUse by5 days to 7 days after the day you opened it
Polenta, frozen
- In the freezerUse by12 months after the day you stored it
- Once thawed · in the fridgeUse by5 days after the day it finished thawing
Is this window about safety or about taste?
The answer at the top of this page reads 5 days to 7 days in the fridge once opened. What decides that is the food and not the shelf the source files it on: Polenta, shelf-stable is cooked or ready to eat and still moist. Past it, throw it out rather than taste it: a perishable food can carry enough bacteria to make you ill while it still looks and smells fine.
The figure in the freezer here is a quality window. The same page carries windows of more than one kind, so which sentence applies depends on which row you are reading, not on the food. Held at 0 °F food stays safe for as long as it stays frozen, which is why a freezer figure counts as quality on this site whatever the food is. Every figure assumes the food was sound when you stored it, that your refrigerator holds 40 °F or below and your freezer 0 °F or below, and that the package was handled normally.
It is past the date. Now what?
Say the calculator above puts Polenta, shelf-stable past its 5 days to 7 days in the fridge once opened window, or the container sat out on the counter overnight. Throw the container out without tasting it, and count any hours it already spent out of the refrigerator as part of that window rather than on top of it.
The USDA's limit for perishable food standing at room temperature is 2 hours, or 1 hour when the kitchen is above 90 °F, and that clock runs whatever the storage figure says. Freezing stops the clock but does not turn it back: food already past its window is not rescued by putting it in the freezer. The FoodKeeper entry this page is built from prints storage times and nothing else, so anything past them here is USDA and FSIS guidance rather than a figure from the source. The whole rule, including the cases the source does not cover, is set out under what to do when the date has passed.
Is that a long time?
Polenta, shelf-stable is the shortest-lived thing the USDA files under Shelf Stable Foods: 7 days, where the item above it, Roasted nuts (peanuts, cashews, almonds), holds 4 weeks and the middle of the 70-item list sits at 1 year.
Items that behave the same way
All 6 of the nearest items keep at least as long as Polenta, shelf-stable, 4 weeks to 5 months against its 7 days: it is the bottom of its own cluster.
- Roasted nuts (peanuts, cashews, almonds)keeps 4 weeks in the fridge once opened
- Pectinkeeps 1 month in the pantry once opened
- Potato chipskeeps 1 week in the pantry once openedup to 2 months sealed in the pantry
- Cashew butterkeeps 3 months in the pantry
- Pine nutskeeps 3 months in the fridge
- Marshmallow crèmekeeps 1 month in the pantry once openedup to 5 months sealed in the pantry
Products the USDA rates in the same places
No other product in the file is rated in exactly this set of places: freezer, refrigerator after opening and refrigerator after thawing, and nothing else. That makes the shape of this record unique among the 466 products here, so the closest comparisons available are the entries that share most of it — Crackers, Nuts and Applesauce. Their windows are printed beside them below, and none of them is rated in quite the same way. Of the 8 shown, 8 keep longer than this one.
Nothing carries this exact set of places, so these share most of it.
- Crackers3 months in the fridge once openedup to 8 months sealed in the pantry
- Nuts2 months in the pantry once openedup to 1 year sealed in the pantry
- Applesauce7 days in the fridge once openedcommercial · up to 18 months sealed in the pantry
- Tomato paste5 days in the fridge once openedup to 27 months sealed in the pantry
- Coconut cream4 days in the fridge once openedup to 5 years sealed in the pantry
- Roasted nuts4 weeks in the fridge once opened
- Pine nuts3 months in the fridge
- Fruits, dried6 months in the fridge once opened
The rest of the Shelf Stable Foods shelf
Every one of the other 69 products on the Shelf Stable Foods shelf keeps longer outside the freezer than this one, from Coconut cream at 5 years down to Roasted nuts at 4 weeks. The closest of them by window are Roasted nuts, Pectin and Potato chips, and the gap between this product and the rest of its shelf is the thing worth noticing here. The order counts the longest window outside the freezer, so Polenta, shelf-stable sits here at 7 days rather than at the 5 days in the fridge once opened its own answer prints.
- Roasted nuts4 weeks4 weeks in the fridge once opened
- Pectin1 month1 month in the pantry once opened
- Potato chips2 months1 week in the pantry once opened
- Cashew butter3 months3 months in the pantry
- Pine nuts3 months3 months in the fridge
- Pork rinds4 months4 months in the pantry
- Marshmallow crème5 months1 month in the pantry once opened
- Fruits, dried6 months6 months in the fridge once opened
If it has to keep longer than this
If it has to keep longer than 7 days, the Shelf Stable Foods aisle gives 69 products that hold at least twice as long outside the freezer. The smallest step up is Roasted nuts at 4 weeks against this one's 7 days; after it come Pectin, Potato chips and Cashew butter. They are printed below in the order the step gets bigger, not alphabetically. The largest step the category offers is Sesame seeds at 5 years. Twice as long is the cutoff used here, so a product a few days apart from this one is not treated as a step.
- Roasted nuts4 weeks4 weeks in the fridge once opened
- Pectin1 month1 month in the pantry once opened
- Potato chips2 months1 week in the pantry once opened
- Cashew butter3 months3 months in the pantry
- Pine nuts3 months3 months in the fridge
- Pork rinds4 months4 months in the pantry
- Marshmallow crème5 months1 month in the pantry once opened
- Fruits, dried6 months6 months in the fridge once opened
The record this page is built from
The USDA publishes 2 separate rows under this name — records 656 and 657 — and this page carries all of them rather than picking one, because their windows differ. Between them they fill 3 of the nine storage slots with a time. Comparisons and the place in the category are computed for Polenta, shelf-stable, which is the kind the plain name means here, chosen kind by kind rather than by the order the source happens to list them in. 1 slot is marked not recommended, which is an answer rather than a gap.
Where these numbers come from
Every range on this page is published by the USDA FoodKeeper and reproduced unchanged. The multipliers, the rankings, the percentages and the dates are ours, computed from those ranges. Where the source gives a span such as 3 to 5 weeks, comparisons use the upper figure, and the full span is always printed.
Rankings cover only the items the USDA gives a usable figure for, and identical ranges share a place rather than being ordered arbitrarily. Neighbors are chosen by nearest storage time within the same category, never alphabetically: two foods filed next to each other by name usually have nothing to do with each other. The freezer is excluded from ranking because it flattens almost everything.
Where the USDA lists several kinds under one name, they share one page here and every kind keeps its own windows: the source prints them as separate rows, and a page that merged them would be inventing a figure the source never published. Comparisons and the place in the category are computed for the kind the plain name means — the shell egg for eggs, the can for tuna — which is settled name by name rather than by the order the source lists its rows in, and the page names it. Where the plain name means no single kind, the page prints no single figure at all and lists the kinds instead.
Source: USDA FoodKeeper, retrieved 1 September 2026. This site computes every comparison on this page and takes responsibility for it. Found a figure that does not match the source? Tell us on the contact page, with the page and the row — the parsing is mechanical, so a mismatch is our bug and we want it. How the whole site is built, which figures are ours and where the source can be checked is on the method page.
USDA index terms: frozen, frozen polenta, shelf stable, shelf stable polenta
KeepsUntil is an independent reference built on public USDA data. It is not affiliated with, endorsed by, or connected to the U.S. Department of Agriculture or the Food and Drug Administration. Whether a given window is a safety limit or a quality window is stated on the page that prints it.