Is Food Safe After a Power Outage?
Last reviewed: June 2026
Quick answer
Food may be safe after a short power outage if the refrigerator or freezer stayed cold enough. A closed refrigerator usually keeps food safe for up to 4 hours. A full freezer can hold temperature for about 48 hours, and a half-full freezer for about 24 hours. If perishable refrigerated food was above 40°F for too long, throw it away. Never taste food to check if it is safe.
Key rule: depends on how long power was out
A closed refrigerator keeps food safe for up to 4 hours. A full freezer holds for 48 hours (24 hours if half-full). After these limits, discard perishable food — when in doubt, throw it out.
The 4-hour refrigerator rule
A closed refrigerator maintains a safe temperature (below 40°F / 4°C) for approximately 4 hours after a power outage. Once the refrigerator temperature has been above 40°F for more than 2 hours, perishable food in it is no longer safe — even if the power comes back on. See the official food-safety sources used by StillSafeFood for references.
Full freezer vs. half-full freezer rule
A full freezer will maintain safe temperatures (0°F / -18°C or below) for approximately 48 hours. A half-full freezer lasts about 24 hours, since there's less frozen mass to hold the cold. If you have a thermometer, check the temperature before eating any thawed food — it must have stayed at or below 40°F to be safe.
Why keeping the doors closed matters
Every time a refrigerator or freezer door opens, cold air escapes and warmer room air takes its place — speeding up how quickly the inside temperature rises. Keeping doors closed during an outage is the single biggest factor in how long your food stays safe, often making the difference between food that's still good and food that needs to be discarded.
How to check refrigerator and freezer temperature
An appliance thermometer is the most reliable way to know if food is still safe. The refrigerator should read 40°F (4°C) or below, and the freezer should read 0°F (-18°C) or below. If you don't have a thermometer, look for ice crystals or firmness in frozen food — fully thawed, soft food that's no longer cold is a sign the freezer was too warm for too long.
What to throw away after a power outage
Discard these if they've been above 40°F for more than 2 hours:
What may still be safe
Not all food needs to be thrown away after every outage — a short outage with the doors kept closed often leaves refrigerated and frozen food just as safe as before.
Safe vs. not safe examples
Likely still safe
- Power out 2 hours, fridge door kept closed the whole time.
- Full freezer, power out 30 hours, food still has ice crystals and feels solid.
- Fridge thermometer reads 38°F when power returns after a short outage.
Not safe — discard instead
- Power out overnight (8+ hours) with the fridge opened several times.
- Half-full freezer, power out more than 24 hours, food fully thawed.
- You don't know how long the power was out or how warm the fridge got.
Food examples
Follow the same 40°F / 2-hour rule as other refrigerated perishables.
Any cooked dish above 40°F for more than 2 hours should be discarded.
Cheese and meat toppings are perishable — treat pizza like any other cooked leftover.
Cooked poultry spoils quickly once above 40°F — when in doubt, discard it.
US refrigerated eggs need consistent cold storage; discard if warmed for too long.
Perishable dairy follows the same temperature and time limits as other refrigerated food.
Sliced deli and lunch meat need consistent cold storage; discard if warmed for too long.
What to do if the power is still out
- Keep refrigerator and freezer doors closed as much as possible.
- Group freezer items together — a fuller freezer holds cold longer.
- If you have one, use a thermometer to track how warm the fridge and freezer get.
- For an extended outage, move critical items (insulin, baby formula, etc.) to a cooler with ice.
- Not sure about a specific food? Use the StillSafeFood checker for a quick, conservative answer.
What to do after power comes back
- Check a thermometer if you have one, and estimate how long the power was actually out.
- If refrigerated food stayed at or below 40°F the whole time, it's still safe.
- If it was above 40°F for more than 2 hours — or you're not sure — discard it.
- Refreeze only food that still has ice crystals or stayed at 40°F or below; otherwise discard it.
- When in doubt, throw it out.
What not to do
- Do not taste food to check whether it is safe.
- Do not rely only on smell, taste, or appearance — many risks are invisible.
- Do not put food outside in snow or cold weather. Outdoor temperatures vary, sunlight can warm food, and it can be exposed to animals or contamination.
How to prepare for next time
- Keep an appliance thermometer in both the refrigerator and freezer.
- Freeze water jugs or ice packs ahead of a forecasted storm or known outage risk.
- Keep the freezer fairly full — it holds cold longer than a half-empty one.
- Have a cooler and bagged ice on hand for short-term storage of critical items.
- Know your refrigerator's 4-hour window and your freezer's 24–48 hour window in advance.
This guidance follows USDA, CDC, and FSIS food safety recommendations. Smell, taste, and appearance are not reliable ways to judge whether food that lost power for too long is safe to eat — go by time and temperature instead. If you think you may have food poisoning, contact a healthcare provider.
Frequently asked questions
How long is food safe in the fridge without power?
Up to 4 hours with the door kept closed. Once food has been above 40°F for more than 2 hours, discard perishables.
How long is food safe in the freezer without power?
About 48 hours if the freezer was full, or 24 hours if it was half-full, with the door kept closed.
What should I throw out after a power outage?
Discard meat, poultry, seafood, dairy, cooked foods, cut produce, and eggs if they have been above 40°F for more than 2 hours.
Can I refreeze food after a power outage?
Only if it still contains ice crystals or has stayed at or below 40°F. Discard anything that has been above 40°F for more than 2 hours.
Is food safe if it still has ice crystals?
Generally yes — food that still has ice crystals and feels cold can usually be refrozen or cooked. Fully thawed food should be treated like any other perishable that got too warm.
Can I taste food to see if it is safe?
No. Never taste food to check its safety. Harmful bacteria and toxins don't reliably change taste, smell, or appearance.
Is it safe to put food outside during a winter power outage?
No. Outdoor temperatures vary, sunlight can warm food, and it can be exposed to animals or contamination. Use a cooler with ice instead.
Check your food after an outage
Use StillSafeFood's power outage mode to check specific foods based on how long power was out.
Check your food →