Keeping Food Safe When the Power’s Out (Plus the Fridge Math)

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Illustration: a dark kitchen during a rainstorm with a refrigerator thermometer, a cooler with ice, a lantern, and a portable power station

Bottom line: Keep the doors shut. A refrigerator keeps food safe for up to 4 hours without power. A full freezer holds a safe temperature for about 48 hours, or 24 hours if half full (FoodSafety.gov). Never taste food to check it. When in doubt, throw it out.

Timeline of food safety in a power outage: closed fridge safe about 4 hours, half-full freezer about 24 hours, full freezer about 48 hours, and the 40 degree Fahrenheit rule
Source: FoodSafety.gov, Food Safety During a Power Outage.

Before the outage

  • ☐ Put appliance thermometers in the fridge and freezer. You can’t judge 40°F by feel.
  • ☐ Keep the freezer full. A full freezer holds its temperature twice as long as a half-full one (48 vs. 24 hours, per FoodSafety.gov). Jugs of water work as filler, and they double as ice.
  • ☐ Know where you can get ice or coolers. Ready.gov suggests coolers with ice if needed (Ready.gov).

During the outage

  • Keep the doors closed as much as possible.
  • After 4 hours without power, perishable fridge food (meat, poultry, fish, eggs, leftovers) should be discarded (FoodSafety.gov).

Big storms can leave millions of homes without power at once. One example:

Newspaper-style graphic: Hurricane Helene leaves 5.9 million customers without power across 10 states, September 2024
Recreated newsprint-style graphic, not an actual newspaper page. Source: EIA, Dec. 1, 2025.

After: keep or toss? (selected items)

Fridge food exposed to 40°F or above for more than 2 hours, per FoodSafety.gov:

Chart of fridge food to toss or keep after more than 2 hours above 40 degrees Fahrenheit: toss meat, dairy, eggs, and cooked leftovers; keep hard cheeses, butter, uncut produce, condiments, and bread
Source: FoodSafety.gov, Food Safety During a Power Outage (selected items; the full chart lists many more).

Freezer: food can be refrozen if it still has ice crystals or is at 40°F or below, though quality may suffer (FoodSafety.gov).

The full chart covers dozens more items. Print it and tape it inside a cabinet.

Can a power station keep the fridge running?

Yes, for a while. The math:

  1. Find your fridge’s yellow EnergyGuide label (kWh per year). The DOE has a search tool if the label is gone.
  2. kWh/year ÷ 365 = kWh per day. Example: 600 kWh/yr ≈ 1,644 Wh/day, or about 68.5 W on average.
  3. Run time ≈ capacity (Wh) × 0.85 ÷ average watts. The 0.85 is Jackery’s planning factor for losses (Jackery).

For that example fridge, a ~1,000 Wh station gives roughly 12–14 hours (DELTA 3 Plus ~12.7 hr, AC180 ~14.3 hr, Explorer 1000 v2 ~13.3 hr; our estimates from manufacturer capacities). Also check the station’s surge rating. Virginia Tech notes a motor draws about 3× its running current for a moment at startup (VCE).

Full walkthrough: How to size a power station.

Which thermometer to buy? See our fridge and freezer thermometer picks: an alarm model, a no-battery dial and an instant-read probe.

Fridge and freezer thermometers are on our Gear page.

Food safety rules from FoodSafety.gov (USDA guidance) and Ready.gov; run times are our estimates from manufacturer specs. We haven’t hands-on tested these setups. Checked Oct 18, 2026.

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