Check freezer food for ice crystals or 40°F after an outage

After a power outage, decide package by package. Ice crystals or a reading of 40°F (4°C) or below make many frozen foods eligible to refreeze, but the government's item chart has exceptions such as ice cream and frozen yogurt. Never taste food to decide.

Use outage time to plan, not to prove

Leave the freezer door closed. FoodSafety.gov estimates that a full freezer holds its temperature for about 48 hours and a half-full freezer for about 24 hours. Those figures assume the door remains closed, and a refrigerator's freezer compartment may not stay frozen as long.

The clock tells you when to prepare for a closer inspection. It does not certify every package. Food near the door, in the front, or in a thin package can thaw sooner than a large item at the back or bottom. If the outage is likely to be prolonged, use a cooler with enough ice to hold food at 40°F or below.

Check temperature and ice crystals when power returns

Start with an appliance thermometer if one was already inside. At 40°F or below, FoodSafety.gov says the frozen food may be safely refrozen, though texture or flavor may be worse after thawing and refreezing.

Without a freezer reading, inspect individual packages. FDA says frozen food that still has ice crystals or is 40°F or below can be safely refrozen or cooked. Use a clean food thermometer on a package when the answer is not visible.

Do not use smell, appearance, or a small taste as a substitute. FoodSafety.gov specifically warns never to taste food to determine safety. Also discard food contaminated by leaking raw meat juices, even if another test appears favorable.

Sort one shelf at a time

Make three groups so the freezer door is not held open while you deliberate:

• Keep or refreeze: the package has ice crystals, or a thermometer shows 40°F or below, and the FoodSafety.gov item chart does not give it a stricter outcome.
• Check now: no crystals are visible, but the package is still refrigerator-cold and can be measured immediately.
• Discard: a perishable package was above 40°F for more than two hours, leaked juices contaminated it, or its time and temperature cannot be established.

For the refrigerator section, the planning window is shorter. FoodSafety.gov says an unopened refrigerator keeps food safe for up to four hours. FDA says food that has been above 40°F for only two hours or less can still be safe; beyond that boundary, its item-specific guidance matters. Do not apply the freezer's 24- or 48-hour estimate to refrigerated leftovers, meat, fish, eggs, or milk.

Check the item chart for exceptions

Temperature and ice crystals are the first decision boundary, not the entire chart. FoodSafety.gov says to discard ice cream and frozen yogurt even when they still contain ice crystals and feel refrigerator-cold. It gives different outcomes for other foods after more than two hours above 40°F: meat and frozen meals are discarded, while hard cheese, bread, and some fruit products may be refrozen. Use the row for the actual food rather than extending a rule from the package beside it.

Prepare the freezer for the next interruption

Keep an appliance thermometer in both the refrigerator and freezer. FDA's target settings are 40°F or below for the refrigerator and 0°F (-18°C) or below for the freezer. A thermometer preserves evidence that memory and an outage alert cannot.

Fill unused freezer space with frozen water containers or gel packs, and group packages so they retain cold. Keep raw meat and poultry below or apart from other food in case juices escape during thawing. A marker and a roll of tape near the freezer can label the outage start time without opening the door.

When the power returns, the useful question is not “Was the outage under two days?” It is “What evidence does this package give me now, and what does its chart row say?” Ice crystals and a temperature at or below 40°F provide the first evidence; the item-specific guidance completes the decision.