The freezer safety standard
These four rules apply to every food on this site. They used to be repeated at the bottom of all 2,052 food pages, which made every page longer and none of them clearer. Now they live here, once, and every page links to them.
The freezer clock tracks quality, not safety. Food that stays solidly frozen at 0 °F (−18 °C) remains safe to eat indefinitely — freezing does not stop spoilage that has already happened, and it cannot make unsafe food safe.
0 °F (−18 °C) is the line
Every window on this site assumes a freezer holding 0 °F (−18 °C) or colder. A domestic freezer set to its middle dial often runs around that, a chest freezer runs colder, and an open-door domestic fridge is a different appliance entirely — it is usually well above 32 °F (0 °C) and cannot be used for long-term storage at all.
Warmer settings shorten every quality window on this site, sometimes a lot: colour, flavour and texture all fade faster, and freezer burn appears sooner. Where public guidance differs between sources, we publish the more conservative range and flag anything genuinely risky rather than averaging the numbers.
Label every package with the date it was frozen
The calendar starts the day it was frozen, not the day you find it. Frozen food does not carry a use-by date, so the label is the only record of its age — and every month printed on this site is a quality window, not a safety one. Rotate first-in, first-out, and write the food and the date together, because "what is this grey slab" is a question nobody enjoys.
Thawing is not a reset
Thawing is not a reset, but it is also not automatically the end. The USDA position is precise: food thawed in the refrigerator may be refrozen without cooking — what you lose is quality, because ice crystals from the first freeze have already damaged cell walls and the second thaw will weep more. Food thawed in cold water or a microwave is the other case: cook it immediately, and only the cooked result may be frozen. It is a rule about how the food got warm, not about the freezer.
The line that ends the discussion is time and temperature rather than the second freeze. Anything that spent two hours or more above 40 °F (4 °C) — a counter thaw, a warm sink, an outage that ran long — should be discarded rather than cooked, because reheating does not remove the heat-stable toxins some bacteria leave behind. The refreezing tool walks the four questions, and each food page carries its own note.
Some foods can be refrozen with real quality loss, and some — cooked rice among them — should never be, because the fast-cool and hot-reheat rhythm that keeps them safe does not survive a second loop.
The two-hour ceiling
Perishable food gets no more than two hours at room temperature, one hour if it is above 90 °F (32 °C). This is the rule that matters most before anything reaches a freezer, and the one most often broken by "I'll deal with it after dinner". The relevant food page carries its own more specific version where the risk is unusual — Bacillus cereus on cooked rice being the standard example.
Primary sources
- USDA FSIS — Freezing and Food Safety Freeze within 3–4 days; do not refreeze refrigerator-thawed food.
- USDA FSIS — Leftovers and Food Safety Refrigerated leftovers keep 3–4 days; reheat to 165 °F (74 °C).
- FDA — Bad Bug Book, 2nd edition Pathogen-by-pathogen reference, including Bacillus cereus.
- USDA FSIS — Cold Food Storage Charts The temperature bands behind the two-hour and four-hour rules.