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Keep the refrigerator and freezer doors shut immediately. An unopened refrigerator generally keeps food cold for about four hours. A full freezer can hold its temperature for approximately 48 hours, or 24 hours when half full, provided the door stays closed. In weather above 90°F (32°C), any perishable food that is outside controlled refrigeration for more than one hour should be discarded. If the outage may last longer than four hours, move perishables into a cooler packed with enough ice or frozen gel packs to keep the food at 40°F (4°C) or below. When time or temperature is uncertain, do not taste the food—throw it out.
The immediate answer: is food in the refrigerator safe?
Usually, refrigerated food is safe for a limited period if the refrigerator remains closed. FoodSafety.gov estimates that an unopened refrigerator holds food cold for about four hours. That is a general estimate, not a guarantee: room temperature, how full the appliance is, its insulation and the number of door openings all affect the result.
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During an outage, safety depends on both time and temperature. Refrigerated food should stay at or below 40°F (4°C). Once a perishable item has been above that limit long enough to enter the danger zone, harmful bacteria may multiply even when the food looks and smells normal. Odor, color and texture cannot reliably prove that food is safe.
For a hot-weather outage, use this order of priorities:
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- Keep every refrigerator and freezer door closed.
- Check appliance or food temperatures if you have thermometers.
- If the outage could exceed four hours, move high-risk refrigerated food to an iced cooler that can remain at or below 40°F (4°C).
- Apply the one-hour limit when outdoor temperatures exceed 90°F (32°C).
- Discard food that has exceeded a time or temperature limit. Never taste it as a test.
Time and temperature limits at a glance
| Situation | What the official guidance says | What to do |
|---|---|---|
| Unopened refrigerator | Food stays cold for about four hours, assuming the door remains shut. | Before that point, keep the door closed and prepare alternate cold storage. Afterward, evaluate each perishable food and discard those beyond the limit. |
| Full freezer | Approximately 48 hours with the door closed. | Keep it closed. Inspect food for ice crystals or a measured temperature of 40°F (4°C) or below when power returns. |
| Half-full freezer | Approximately 24 hours with the door closed. | Use the shorter holding estimate and arrange additional cold storage sooner. |
| Perishables above 90°F (32°C) | No more than one hour unrefrigerated. | Discard food that has been outside safe cold storage longer than one hour. |
| Cold-storage target | Refrigerator and cooler: 40°F (4°C) or below. | Use a thermometer rather than judging by the presence of a little ice. |
| Freezer target during normal operation | 0°F (-18°C) or below. | Keep a freezer thermometer in place so you know the starting condition. |
The freezer estimates describe how long the appliance may retain a safe temperature, not how long food can be left on a counter. They also assume the door stays closed throughout the outage.
What to do during the outage
1. Close the doors and leave them closed
Every opening releases the cold air that is preserving the food. Do not open the refrigerator to browse, take photographs or check items one by one. Decide what you need before opening it, then remove everything in a single, quick operation. Keep the freezer closed even if you suspect it has begun to warm; opening it shortens the remaining cold-holding time.
2. Start a clock and record temperatures
Note the time the power stopped. If an appliance thermometer is visible without opening the door, record its reading. A thermometer in the refrigerator, freezer or emergency cooler gives you useful evidence; a handful of ice inside a cooler does not prove that the food itself is at a safe temperature.
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If the outage may last beyond the refrigerator’s roughly four-hour holding period, put refrigerated perishables into an insulated cooler with enough ice or frozen gel packs to maintain 40°F (4°C) or below. A separate thermometer inside the cooler helps verify that target. Keep the cooler shaded, avoid leaving it in a hot vehicle or direct sun, and open it only briefly.
Prioritize foods that spoil quickly: meat, poultry, fish, eggs, leftovers and other refrigerated perishables. Pack the cooler tightly enough to retain cold, but do not delay transfer while trying to organize it perfectly. Food that must be kept cold is more important than beverages or condiments that can be replaced.
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4. Apply the hot-weather one-hour rule
When the surrounding temperature is above 90°F (32°C), perishable food should not remain unrefrigerated for more than one hour. This limit applies to food on a kitchen counter, in a warm car, on a porch or in a cooler that has risen above 40°F (4°C). A few melting ice cubes are not a safety measurement; check the temperature where possible. If you cannot establish that the food stayed cold, treat the exposure conservatively.
5. Use dry or block ice only with care
For a prolonged outage, official guidance identifies dry ice or block ice as options for keeping cold storage colder. Availability varies by location, so identify a local source before storm season. Follow the supplier’s handling directions, never touch dry ice with bare hands and do not place it directly against food. Use a container and arrangement that keeps the food separated from the ice while maintaining a measured temperature of 40°F (4°C) or below.
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Refrigerator food: what to discard when power returns
After the refrigerator has been without power for about four hours
FoodSafety.gov advises discarding refrigerated perishables such as meat, poultry, fish, eggs and leftovers after four hours without power when the refrigerator has not been kept cold by another method. That estimate assumes the appliance door stayed closed; repeated openings or a very hot room can reduce the effective holding time.
Use the official FoodSafety.gov food-by-food chart for individual decisions, especially when an item was moved to a cooler or you know it crossed 40°F (4°C). Many chart entries use exposure at or above 40°F (4°C) for more than two hours as a discard trigger for perishable foods. Follow the entry for the specific food instead of applying a favorite rule to everything in the refrigerator.
Foods that are not automatically safe because they look normal
Do not use smell, color, firmness or a small taste to decide. FoodSafety.gov states: “After a power outage never taste food to determine its safety.” Bacteria that cause illness may not change the food’s appearance or odor. Heating, reheating or cooking food later is not a reason to ignore a known time-and-temperature violation.
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What about condiments and less-perishable items?
The federal chart distinguishes foods by type, packaging and handling. Rather than guessing about mayonnaise-based salads, dairy products, cut produce, sauces or opened containers, look up the exact item in the chart. If the item is not listed and you cannot establish that it stayed at or below 40°F (4°C), the safer choice is to discard it.
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Use the freezer’s holding estimate as a planning tool
A full freezer may retain a safe temperature for approximately 48 hours, while a half-full freezer may do so for approximately 24 hours, with the door closed. A fuller freezer has more frozen mass and therefore tends to warm more slowly. These are estimates, not permission to keep opening the door to check progress.
Ice crystals and temperature determine the next step
When power returns, frozen food that still contains ice crystals and feels as cold as refrigerated food, or that measures 40°F (4°C) or below, can generally be refrozen or cooked. Refreezing may reduce quality: meat can lose moisture, vegetables can soften and prepared foods can change texture. That quality loss is separate from the safety decision.
If an item is fully thawed and has been above 40°F (4°C) long enough to exceed the applicable limit, discard it. Use the official frozen-food chart for a specific product when the condition is unclear. Do not decide by tasting a thawed item.
How to move food into a cooler safely
- Choose the container. Use an insulated cooler large enough to hold the food with ice or frozen gel packs around it.
- Pre-chill if possible. Put frozen gel packs or ice in the cooler before loading food so the interior starts cold.
- Pack high-risk foods first. Group meat, poultry, fish, eggs, leftovers and other perishables together, sealed to prevent leaks.
- Add sufficient cold source. Use enough ice, gel packs or properly handled block ice to keep the food at or below 40°F (4°C).
- Insert a thermometer. Place it where it reflects the food’s environment, not on top of a warm lid or against an ice pack.
- Close and shade the cooler. Keep it out of direct sunlight and open it only to add or remove food.
- Recheck the temperature. If it rises above 40°F (4°C), begin the food-specific discard evaluation rather than assuming the ice will cool it again in time.
A cooler is not automatically safe simply because it contains ice. The relevant evidence is the temperature of the food or its surrounding cold storage and the length of time outside the safe range.
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When in doubt, throw it out
FoodSafety.gov’s outage chart uses the line “When in Doubt, Throw it Out!” That advice matters most when you do not know when the food warmed, the appliance door was opened repeatedly, the cooler temperature was not monitored or the item’s history is uncertain.
- Discard food that stayed above 40°F (4°C) beyond the time allowed for that food.
- Discard perishables exposed for more than one hour in conditions above 90°F (32°C).
- Discard food with an unknown temperature history when you cannot verify that it remained cold.
- Do not rescue questionable food by tasting, smelling, rinsing or scraping off the surface.
- Keep questionable food away from food you are keeping, and clean leaks from shelves or containers.
Preparation before the next hot-weather outage
Keep temperature information available
Place a refrigerator appliance thermometer and a freezer thermometer inside the appliances. Set the refrigerator to 40°F (4°C) or below and the freezer to 0°F (-18°C) or below. A thermometer gives you a baseline before an outage and evidence afterward; without one, you may be forced to rely on uncertain timing.
Build a cold-storage kit
- Keep an insulated cooler where it can be reached quickly.
- Freeze reusable gel packs before severe weather and keep them ready.
- Freeze containers of water ahead of time to create additional cold mass.
- Freeze refrigerated foods that will not be needed immediately when a major outage is forecast.
- Group freezer items together so they retain cold longer.
- Identify where block or dry ice is sold locally and read the handling directions before an emergency.
- Keep a separate thermometer available for the cooler.
Plan for the local climate
In a hot climate, the one-hour limit above 90°F (32°C) can be reached quickly once food leaves controlled refrigeration. Decide in advance which foods will go into the cooler, who will monitor its temperature and where it will be kept shaded. Do not plan to use a garage, parked car or outdoor area as a substitute refrigerator unless you can verify the food remains at or below 40°F (4°C).
Practical decisions for common outage scenarios
The power returns after two hours
If the refrigerator and freezer doors stayed closed, the outage is within the refrigerator’s general four-hour holding estimate. Check the appliance thermometers, restore normal operation and continue monitoring. Do not open the doors repeatedly while the interior is cooling back down.
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Move refrigerated perishables to a monitored cooler before the four-hour point if possible. Because the ambient temperature exceeds 90°F (32°C), any perishable food left unrefrigerated for more than one hour must be discarded. Use the food-specific chart for items whose temperature history is known; do not rely on smell.
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The freezer is half full and the outage lasts overnight
Use the approximately 24-hour estimate for a half-full freezer, keeping the door closed. When power returns, inspect individual packages for ice crystals and check whether food is at or below 40°F (4°C). Refreeze or cook food meeting those conditions, accepting possible quality loss; discard food that exceeded the applicable limit.
The cooler has ice but no thermometer
Ice alone does not establish a safe temperature. If you cannot verify that the food stayed at or below 40°F (4°C), use the elapsed-time and hot-weather rules and the official chart. For high-risk perishables with an uncertain history, discarding is safer than guessing.
Common mistakes that make an outage worse
- Opening the freezer to “check it.” Each opening releases cold air and shortens the estimated holding period.
- Waiting until food feels warm. Bacterial growth can occur before a dramatic change in texture or smell.
- Trusting a little ice in a cooler. Measure the temperature; melting ice does not prove the food is at 40°F (4°C) or below.
- Tasting a small bite. FoodSafety.gov specifically warns against tasting food to determine safety.
- Applying one rule to every food. Use the official chart because products differ in composition, packaging and exposure tolerance.
- Ignoring the weather. Above 90°F (32°C), the unrefrigerated limit for perishables is one hour, not two.
A simple decision framework
For every questionable item, answer these questions in order:
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors- Was it kept at or below 40°F (4°C)? Use a thermometer whenever possible.
- How long was it above that temperature? Record the outage start and any time in a warm room, car or cooler.
- Was the surrounding temperature above 90°F (32°C)? If so, apply the one-hour limit for perishables.
- Is it frozen with ice crystals, or at or below 40°F (4°C)? If yes, frozen food can generally be refrozen or cooked, although quality may decline.
- Can the history be verified? If not, follow FoodSafety.gov’s “When in Doubt, Throw it Out!” guidance.
This approach answers the practical question without relying on unreliable sensory checks: preserve cold food promptly, measure what you can, use the official food-specific chart and discard when the limits are exceeded.
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