How long does butter last

Keep butter in its tub or in greaseproof paper, on an inside shelf at 4°C (40°F). The door warms up every time it opens, and butter picks up the smell of onions and fish. FoodKeeper’s fridge window is 1–2 months from the purchase date. It does not publish a second row for opened butter. A date on the pack that arrives sooner wins. The split between a safety date and a quality date is on the use-by and best-before guide.

The counter is not a pantry life. FoodKeeper’s note says butter may be left at room temperature for 1–2 days. That is not a butter dish that lives out for a week. In a warm kitchen the fat softens, water splits off, and rancidity moves faster. The dataset prints one row for salted and unsalted. This page does not invent a second clock. Write the day you mean to finish it on the tub.

Get perishable food into the fridge within 2 hours of cooking it or bringing it home, and within 1 hour if the kitchen is above 32°C (90°F). USDA FSIS and Turkey’s Ministry of Agriculture and Forestry both publish that cutoff. A closed deep pot stays warm; a shallow box cools.

A chart is a window, not a verdict on the container in your hand. A sour smell, a slimy surface, or mould means it is finished, even on day one. This page is not medical advice.

• A sharp smell like wax, paint, or stale nuts. That rancid note is not the same as sour milk.
• Mould. Do not trim the edge the way some people do with a hard cheese. Mould finishes the pack.
• A grey-green or dark specks that are not the usual yellow.
• Water that has split from the fat and left a sour layer in the tub.

A soft texture on its own is not spoilage. Smell and mould come before the chart.

Portion what you will not use, press out the air, and freeze it in greaseproof paper or a closed box. The ministry’s freezer list caps butter at 3 months. FoodKeeper prints 6–9 months as the quality window for the same food. The two official windows do not match. The bold number stays 3 months. The months are not a safety date. USDA says food held continuously at −18°C (0°F) stays safe, and the ministry notes that freezing does not kill bacteria.

Thaw in the fridge, not on the counter. Do not refreeze a block that has thawed. Frozen shavings are fine for baking. Frying wants thawed butter that has not gone rancid.

Thaw in the refrigerator, not on the counter. Do not refreeze a portion that has thawed. The ministry states the same rule: thaw frozen food in the fridge and take out only what you will eat.

• Butter can live on the counter for weeks. FoodKeeper’s note is 1–2 days. This page has no longer counter time.
• The freezer month is a use-by date. FoodKeeper’s 6–9 months is about quality. The ministry’s shorter ceiling is 3 months.
• Unsalted butter has its own official time. FoodKeeper prints one row. This page does not add a number between salted and unsalted. The date on the pack still leads.

The windows assume a generally healthy household. Pregnancy, young children, older age, or a weakened immune system are reasons to keep the shorter figure, to skip raw or undercooked food, and to reheat leftovers until the centre is steaming. USDA’s figure for reheating leftovers is 74°C (165°F).

Rancid butter is a quality problem first. Mould is different: throw the pack out, and do not rescue the edge. In pregnancy, for young children, in older age, or with a weakened immune system, do not sort mouldy dairy by tasting it. Butter is not raw meat. Heating a doubtful tub does not undo mould.