Power outage food decision
Use the four-hour refrigerator food safety check after a power outage
Keep the refrigerator and freezer closed, record when power failed, and use official time and temperature rules. When the history is uncertain, choose the safer discard decision rather than relying on smell, appearance, or taste.
| Situation | Conservative action | Stop guessing when |
|---|---|---|
| Power just failed | Keep refrigerator and freezer doors closed and record the outage start time | Opening the door is not needed for an immediate safety or medical reason |
| Refrigerator stayed closed | Use the official four-hour refrigerator window as a planning limit | The outage time is unknown or the door was opened repeatedly |
| Power returns within four hours | Check the official guidance, food type, appliance temperature information, and local instructions before keeping perishables | The food was above 40 F for two hours or more, or its temperature history cannot be established |
| Outage passes four hours | Discard refrigerated perishable foods identified by USDA guidance unless reliable temperature evidence supports another official decision | You are relying only on appearance, smell, package coolness, or hope |
| Freezer food remains | A full unopened freezer may hold temperature about 48 hours and a half-full one about 24 hours; verify ice crystals or 40 F or below using official guidance | The freezer was opened, the timing is unknown, or food condition cannot be verified |
| Food looks or smells normal | Do not taste food to decide whether it is safe | Anyone suggests a small bite, cooking, or reheating as proof that unsafe storage did not matter |
| Higher-risk household or uncertainty | Use the more conservative discard choice and contact the local health department or appropriate official source | A person is pregnant, very young, older, immunocompromised, ill, or individual medical advice is needed |
Record before deciding
- Write outage start, door openings, appliance temperature, and power-return time.
- Use USDA/CDC discard guidance by food type; do not improvise from smell or taste.
- Follow local emergency, utility, shelter, boil-water, evacuation, and health-department instructions when they apply.
Safety boundary: This checklist is general emergency food-safety education. It does not inspect a specific food, determine an individual's medical risk, replace a local health department or emergency instruction, or make uncertain temperature history safe. When time, temperature, or handling history is uncertain, use the conservative discard decision.
Start with time, temperature, and door openings
The four-hour refrigerator rule is a conservative planning limit for an unopened refrigerator, not a promise that every item remains safe until a timer expires. Record when power failed, whether the door was opened, and any reliable appliance temperature. If the outage start or temperature history is uncertain, do not reconstruct it from memory, package coolness, smell, or appearance.
USDA and CDC guidance separates refrigerated perishables from freezer items and shelf-stable food. Use the official food-type guidance rather than one rule for the whole kitchen. Keep the refrigerator and freezer closed unless opening is necessary, because each opening reduces the remaining cold margin.
Use the four-hour point as a stop signal
Once a refrigerator has been without power for four hours, the conservative action is to discard refrigerated perishable foods identified by official guidance unless reliable temperature evidence supports a different official decision. Never taste food to test whether storage was safe. Cooking or reheating does not prove that an unsafe time-and-temperature history no longer matters.
If power returned sooner, the decision still depends on food type, temperature evidence, and handling history. A refrigerator thermometer can provide evidence; a cold-feeling package cannot. When the facts are incomplete, the stop condition is uncertainty itself: choose the safer discard decision and use local health-department guidance when available.
Check freezer food separately
An unopened full freezer may hold temperature for about 48 hours and a half-full freezer for about 24 hours, but those figures are planning estimates rather than guarantees. Ice crystals or a measured temperature of 40 F or below can support the next official check. Repeated door opening, an unknown outage start, or uncertain thawing history removes confidence from the estimate.
Do not move a refrigerator rule onto frozen food or assume that refreezing is automatically appropriate. Compare the item and its measured condition with current USDA guidance. If floodwater, damaged packaging, a boil-water notice, evacuation, or another emergency condition is involved, follow the applicable local instruction before this household checklist.
Use a more conservative handoff for higher-risk households
Pregnant people, young children, older adults, immunocompromised people, and people who are ill can face greater consequences from foodborne illness. This page does not estimate an individual's medical risk or tell a household which questionable food is safe. When exposure or symptoms are a concern, contact an appropriate clinician, poison control resource, local health department, or emergency service as the situation requires.
Stop using the checklist when someone is sick, a food has already been eaten and causes concern, or the decision requires personal medical advice. The checklist is for organizing evidence before a discard decision. It is not a diagnostic tool and does not replace current emergency, utility, shelter, or public-health instructions.
Keep a short outage record
Write the power-failure time, each necessary door opening, thermometer readings, power-return time, and the final keep-or-discard decision. List uncertain items separately instead of mixing them with food that has a reliable temperature history. Photographing a thermometer or utility notice can preserve the evidence, but a photo of the food itself cannot establish safe storage.
After cleanup, reset the refrigerator thermometer, replace used emergency supplies, and note which part of the plan failed: no outage start time, no appliance thermometer, repeated door opening, unclear food categories, or missing local contact information. Fix that planning gap before the next outage. Do not keep discarded food as a teaching sample, and clean surfaces according to the product label and current food-safety guidance.