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A refrigerator that stays closed keeps food cold for about 4 hours during a power outage, according to FoodSafety.gov’s chart, last reviewed August 8, 2024. Keep the door shut. If the outage lasts longer, use a reliable thermometer and the food-specific guidance below to decide what to keep; discard refrigerated perishables that were above 40°F (4°C) for two hours or more.
What to do while the power is out
- Keep the refrigerator door closed. Opening it lets cold air escape and can shorten the time food stays cold.
- Track the outage. The roughly four-hour estimate applies to a closed refrigerator; it is not a guarantee for every appliance or starting temperature.
- Check the temperature if you can. An appliance thermometer can show whether the refrigerator stayed at 40°F (4°C) or below. A thermometer helps assess conditions but does not extend safe holding time.
- After four hours, assess perishables individually. Follow the official chart rather than assuming every item must be discarded or is safe.
FoodSafety.gov’s guidance is to discard perishable food that has been above 40°F (4°C) for two hours or more. If the surrounding temperature is above 90°F (32°C), the limit is one hour. Do not taste food to judge its safety: smell and appearance cannot reliably show whether it is safe.
Which refrigerated foods should you check?
Pay particular attention to meat, poultry, fish, eggs, milk, leftovers, and other refrigerated perishables. FoodSafety.gov’s power-outage food chart gives item-by-item keep-or-discard guidance. The distinctions matter: for example, some hard cheeses may be kept while soft cheeses should be discarded. Check the chart for the specific food instead of applying a single rule to everything in the refrigerator.
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A closed freezer holds cold much longer than a refrigerator: FoodSafety.gov estimates approximately 48 hours if full and 24 hours if half-full. These are approximate freezer holding times, not refrigerator times.
#1 Best Overall
- Convenient and practical: Our refrigerator thermometer is suitable for traditional refrigerators, freezers, insulated boxes, etc. It has a large dial with clear blue and red area indication on the surface of the fridge thermometer, making it easier for you to read the temperature.
- Temperature range: Refrigerator thermometer measures refrigerator temperature -20~80 °F/ -30~30 °C, meeting different requirements and requirements. Clear reading scale helps you measure food stored at the right temperature to ensure safety.
- Exquisite design: The refrigerator thermometer uses a hook type panel design, can be hung or placed in different positions, reading instant with the mechanical design, no need for battery power with our freezer thermometer.
- Durable material: Refrigerator thermometer is made of stainless steel material, not easy to break, long life, durable, easy to clean structure and glass protective lens, very suitable for use in the refrigerator and freezer.
- What you get: 2 x PECULA Refrigerator Thermometer and our 7*24 friendly customer service for peace of mind.
Frozen food that still has ice crystals and feels cold as if refrigerated may be refrozen, though quality can decline. Some foods have specific exceptions, so consult the FoodSafety.gov chart before deciding. Do not treat the freezer’s estimated holding time as proof that every item remains safe.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to prepare for a longer outage
- Keep appliance thermometers in both the refrigerator and freezer so you can check actual temperatures.
- Have a cooler available, along with ice or frozen gel packs. For a cooler to help protect perishables, keep them at or below 40°F (4°C).
- For extended outages, see FoodSafety.gov’s emergency food-safety guidance for information on dry or block ice and safe handling.
For general food-handling advice, see FoodSafety.gov’s 4 Steps to Food Safety.
Quick Recap
Best Value
- Large Screen, Small Size: LCD display, big digits. You can visually observe the temperature, and also won't take too much places.（Tips: Please remove the protective film on the screen surface before use）
- Wide Measuring Range & Accurate: Temperature range is -4°F to 122°F with high accuracy 2°F up/down. Max/Min temperature value display on screen, you can easily monitor the temp change of your fridge.
- Hook, Magnet, Stand: Temperature sensing point is on the back. Hanging inside the refrigerator, the measuring temperature is more accurate.
- New Design Upgrade: Waterproof structure level IPX3, ABS environmentally friendly material. Worked with CR2032 battery(included), batteries can be replaced.
- Multiple uses: Digital refrigerator thermometers can be used in household fridge, restaurants, bars, cafes, large supermarkets and convenience store freezers, pharmacy medicine chests, rooms, wineries, etc.
Rank #4
- Temperature range: -40°to 80°F or -40°to 27°C
- Thermometer material:Plastics + Stainless Steel
- Good quality
- Easy to install
- Cheap
Rank #3
- Measuring range:-20~80℉
- Material type：Stainless steel
- Installation mode：Wide base and integrated hook allow it to be placed anywhere in the refrigerator
- Easy to read
- Great quality
Rank #2
- Measuring range:-20~80℉
- Material type：Stainless steel
- Installation mode：Wide base and integrated hook allow it to be placed anywhere in the refrigerator
- Easy to read
- Please give the thermometer enough reaction time
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