How Long Is Food Safe When the Power Goes Out?
Your refrigerator keeps food safe for about 4 hours if you keep the door shut. A full freezer holds a safe temperature for about 48 hours, or 24 hours if it’s half full. After that, bacteria can grow fast enough to make you sick, and you can’t see, smell, or taste the difference.
Use the decision path below to check your food before you eat any of it.
The 4-Hour Refrigerator Rule
Keep the refrigerator door closed as much as you can. Every time you open it, cold air escapes and the clock resets faster.
If the power has been out more than 4 hours, throw out perishable refrigerated food. This includes meat, poultry, fish, eggs, milk, soft cheese, and leftovers. Do not taste any of it to check if it’s safe. When in doubt, throw it out.
The 48-Hour Freezer Rule
A full freezer stays safely cold for about 48 hours with the door closed. A half-full freezer holds for about 24 hours. Grouping food together in the freezer helps it stay cold longer.
If you know a storm or outage is coming, freeze water in clean containers or bags ahead of time. The extra ice blocks help keep both the freezer and refrigerator cold longer, and the melted water is safe to drink if your tap water becomes unavailable.
Printable Decision Path: Is Your Food Safe?
Walk through these steps in order after the power comes back on.
- Step 1: How long was the power out? Less than 4 hours with the doors kept shut — refrigerated and frozen food is safe. Move on to Step 4.
- Step 2: More than 4 hours? Throw out refrigerated perishables now: meat, poultry, fish, eggs, milk, soft cheese, and leftovers.
- Step 3: Check your freezer thermometer. Reads 40°F or below, or food still has ice crystals — safe to refreeze or cook. Reads above 40°F with food fully thawed and no ice crystals — throw it out.
- Step 4: Look, smell, and check texture on every remaining item. Unusual odor, color, or texture — throw it out, no exceptions.
This guide follows current guidance from FoodSafety.gov. Some foods, like hard cheese, butter, whole fruits, and unopened condiments, can safely stay at room temperature. Check each item individually if you’re unsure.
Thermometer Checklist
An appliance thermometer is the only reliable way to know if your food stayed at a safe temperature. Don’t guess.
- Keep one appliance thermometer in the refrigerator and one in the freezer, year-round.
- Refrigerator should read 40°F or below at all times.
- Freezer should read 0°F or below at all times.
- After an outage, check the thermometer before you check anything else.
- If you don’t have a thermometer in place, check each food package individually for ice crystals or warmth.
We’ve reviewed reliable appliance and food thermometers in our survival gear coverage, along with coolers that can extend safe storage time during a longer outage.
When to Throw It Out — No Exceptions
Throw out these foods after 4 hours without power, no matter how they look or smell:
- Raw or cooked meat, poultry, and seafood
- Eggs and egg substitutes
- Milk, soft cheese, and other dairy
- Leftovers and deli items
Never taste food to test whether it’s safe. Foodborne bacteria don’t change how food looks, smells, or tastes. This is the core rule behind every official food safety chart: when in doubt, throw it out.
Refreezing Thawed Food Safely
Partially thawed freezer food can sometimes be saved. Check the appliance thermometer or the food itself.
If the food still has ice crystals or reads 40°F or below, it’s safe to refreeze or cook right away. If it has fully thawed and warmed above 40°F, throw it out. Quality may suffer after refreezing, but that’s a separate issue from safety.
Vulnerable Groups and Extra Caution
Pregnant women, young children, adults over 65, and anyone with a weakened immune system face a higher risk of severe illness from spoiled food. For these groups, follow the strict 4-hour and 48-hour limits with no exceptions, and skip foods that fall into the “check individually” category.
If someone in your household depends on refrigerated medicine, such as insulin, plan a separate cold-chain backup. That goes beyond food storage and may need guidance from a pharmacist or your prescriber.
When to Call for Help
Call 911 for any medical emergency, including signs of severe food poisoning such as high fever, bloody diarrhea, or dehydration that won’t improve.
Call your local utility to report the outage and get restoration updates. If you smell gas, see downed power lines, or notice flooding near electrical panels, leave the area and call emergency services before doing anything else. Never attempt electrical repairs yourself.
Frequently Asked Questions
Can I keep the refrigerator door open to check on food during an outage?
No. Every time you open the door, cold air escapes and the 4-hour safety window gets shorter. Open it only when necessary.
Is it safe to eat food that still feels cold after a long outage?
Feel and appearance aren’t reliable. Use an appliance thermometer or check the official time limits instead. Bacteria that cause food poisoning don’t always change how food feels.
Can I refreeze food that partially thawed?
Yes, if it still has ice crystals or reads 40°F or below on a thermometer. If it’s fully thawed and warm, throw it out.
Do canned goods and pantry staples need the same 4-hour rule?
No. Unopened canned goods, dry staples, and shelf-stable pantry items don’t need refrigeration and aren’t affected by a power outage. Our guide to emergency food and water storage covers how to build that kind of shelf-stable backup supply.
Educational Disclaimer
This article is for general education and is not a substitute for professional medical or food safety advice. Time and temperature limits come from FoodSafety.gov and the CDC. Always check official guidance during an active emergency, and see our medical disclaimer for more information. For a medical emergency, call 911.
Sources: FoodSafety.gov, Food Safety During Power Outage and CDC, Preventing Food Poisoning.