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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsA closed freezer is estimated to keep food at a safe temperature for about 48 hours when full, or about 24 hours when half full. These are planning estimates, not guarantees: keep the door shut, then check the food and its temperature when power returns.
How long a freezer stays cold
FoodSafety.gov estimates approximately 48 hours for a full freezer and 24 hours for a half-full freezer, provided the door remains closed. The figures appear in its Food Safety During Power Outage guidance, reviewed September 20, 2023.
| Freezer condition | Estimated time at a safe temperature | Important condition |
|---|---|---|
| Full | Approximately 48 hours (FoodSafety.gov) | Keep the door closed |
| Half full | Approximately 24 hours (FoodSafety.gov) | Keep the door closed |
The estimates distinguish only between a full and half-full freezer. FoodSafety.gov does not give separate times for other fill levels, freezer styles, starting temperatures, or room temperatures. Repeatedly opening the door also undermines the closed-door assumption, so do not treat either figure as a precise countdown for a particular appliance.
What to do while the power is out
- Keep the freezer door closed and open it as little as possible. Each opening lets cold air escape.
- If an outage may last, have coolers and ice available so food can be kept cold outside the freezer if needed.
- For future outages, FoodSafety.gov recommends grouping food together in the freezer and keeping a freezer appliance thermometer inside.
How to assess frozen food after power returns
Check the freezer thermometer if you have one. FoodSafety.gov says food is safe to refreeze if the thermometer reads 40°F (4°C) or below. Without a thermometer, inspect each package: food that still has ice crystals or is at or below 40°F (4°C) may be refrozen or cooked. Refreezing can reduce quality.
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Assess items individually rather than assuming everything is safe or unsafe based only on the outage duration. Do not taste food to determine whether it is safe, and do not rely on appearance alone.
Temperature targets to know
For normal operation, FoodSafety.gov recommends keeping the freezer at or below 0°F (-18°C). After an outage, its emergency guidance uses 40°F (4°C) as the threshold for deciding whether food may be refrozen. These temperatures serve different purposes: the first is the usual freezer setting; the second is a post-outage food-safety criterion.
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Can dry ice help during a prolonged outage?
FoodSafety.gov gives a specific example: 50 pounds of dry ice should keep an 18-cubic-foot, fully stocked freezer cold for two days. This is guidance for that stated capacity and load, not a guarantee for other freezers or conditions. Do not handle dry ice with bare hands or let it touch food directly. See Food Safety in a Disaster or Emergency for the official preparation and handling guidance.
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Prepare before the next outage
- Keep a freezer appliance thermometer inside. FoodSafety.gov recommends one so you can check conditions after power returns.
- Group frozen food together and keep the freezer door closed during an outage.
- Keep coolers and ice available if food may need to be kept cold outside the appliance.
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