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Keep the freezer closed, record when the power failed, and check the food's temperature when power returns. Meat that still has ice crystals or is at 4°C or below may be refrozen. Meat that has been above 4°C for more than two hours should be discarded.
That decision comes from the Food Safety During Power Outage chart, with the same ice-crystal and temperature check in the FDA's Refrigerator Thermometers guide. Do not taste a piece to decide whether it is safe.
While the power is off
Leave the door shut as much as possible. Searching through every drawer lets cold air escape before you know whether anything needs moving. Write the outage start time on your phone or a note, and keep track of any period when the door was left open.
The chart estimates about 48 hours of safe temperature for a full freezer and about 24 hours for a half-full one with its door closed. These are approximate holding times, not a guarantee for every appliance, room or pack. A poorly sealed door or repeated opening changes the situation. Do not use the estimate instead of checking the food.
If you have access to another working freezer, arrange the space before opening yours. Move still-frozen packs quickly in an insulated container. Keep raw meat in leakproof packaging and separate from ready-to-eat food. The Singapore Food Agency's Food Safety Tips explain the need for separation and cold storage.
Check each pack when the power returns
Use an appliance thermometer for the freezer and a suitable food thermometer for individual food checks, following its instructions. A cold freezer display after the motor restarts cannot tell you how warm the food became during the outage.
| What you can establish | Decision for raw meat, poultry or seafood |
|---|---|
| Ice crystals remain, or the food is at 4°C or below | It may be refrozen or cooked; quality may decline. |
| It was above 4°C for more than two hours | Discard it. Cooking later is not the advised recovery. |
| It has thawed and you cannot establish how long it was warm | Discard rather than guessing from smell or appearance. |
Do not combine safe and questionable packs in one container. Keep anything leaking away from other food while you sort and dispose of it.
Two situations that need different answers
Imagine a short outage with the freezer kept shut. A pack is still hard with visible ice crystals when you inspect it. It can go back into stable frozen storage; write down the incident so you remember why its quality might differ later.
Now imagine finding a soft pack after an overnight outage with no temperature record. A freezer thermometer reading taken only after power has returned cannot reconstruct that history. Refreezing the pack would hide the thawing, without resolving the safety question.
Prepare for the next outage
Keep appliance thermometers in the fridge and freezer, check them routinely, and know where an insulated cooler and ice packs are stored. Maintain a simple list of what is frozen so you can decide what needs attention without a long search. Set the freezer to −18°C or below during normal operation, as SFA recommends.
Finish the safety decisions before replacing discarded food. Once the freezer is working normally again, use your inventory to replace only the ingredients you need.