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Leftovers, Thawing, and Fridge Storage: The Food Safety Rules in One Place

Refrigerator shelf holding leftovers in sealed containers, jars and a cut lemon

Photo: USDAgov via Flickr (Public Domain) · license

Keep the fridge at 40°F or below (checked with a thermometer, not the dial), get perishables cold within 2 hours, eat cooked leftovers within 3 to 4 days, and reheat them to 165°F. After a power outage, an unopened fridge holds about 4 hours and a full freezer about 48.

Those numbers come from USDA, FDA, and CDC, and the tables below put them in one place. The rest of the page covers the spots where people go wrong: trusting the dial, trusting the date on the package, and guessing after the power comes back. Smell isn’t on the list anywhere, and that’s on purpose.

The rules at a glance

Situation The rule Whose rule
Fridge temperature 40°F or below FDA, CDC
Freezer temperature 0°F or below FDA, CDC
Perishables at room temperature Fridge within 2 hours, 1 hour above 90°F; past that, throw it out, don’t cook, refreeze, or rescue it USDA
Cooked leftovers 3–4 days in the fridge; 3–4 months in the freezer for best quality USDA
Big pots of soup, stew, chili, or rice Divide into shallow containers so they cool quickly USDA, FDA
Small portions of hot food Can go straight into the fridge CDC
Cooked rice Fridge within 1 hour if you can, never beyond 2 CDC
Raw ground meat and poultry 1–2 days in the fridge FoodSafety.gov
Raw steaks, chops, roasts 3–5 days in the fridge FoodSafety.gov
Reheating leftovers 165°F on a food thermometer USDA, CDC
Thawing Fridge, cold water, or microwave; never on the counter FDA, CDC
Thawed in cold water or microwave Cook it right away FDA
Thawed in the fridge Can be refrozen uncooked inside its fridge window (some quality loss) USDA
Marinating Always in the fridge FDA
Bagged greens labeled “ready to eat,” “washed,” or “triple washed” No re-washing needed FDA

Your fridge dial isn’t a thermometer

The numbers on many fridge controls are settings, not degrees. FDA notes that few refrigerator controls show actual temperatures. It recommends an inexpensive freestanding appliance thermometer in the fridge and another in the freezer, checked often.

Two placement details from FDA:

  • The door is the warmest spot. FDA says to keep eggs in their carton on a shelf inside the fridge, not in the door.
  • Packing it full works against you. Cold air has to circulate around refrigerated food to keep it chilled, so FDA says not to overpack.

If the thermometer reads above 40°F, turn the control colder and recheck. FDA’s thermometer guidance says food that was above 40°F for 2 hours or less should be safe. If you can’t tell how long it’s been warm, FDA’s advice is to throw it out. If it’s been longer than 2 hours, throw it out too; the outage section below explains why this page uses the 2-hour line.

Don’t let it cool on the counter

The 2-hour clock starts when cooking ends, not when the food feels cool. FDA’s rule is to refrigerate perishables within 2 hours of cooking or buying them, 1 hour when it’s above 90°F.

CDC says small portions of hot food can go straight into the fridge. Larger amounts get divided into shallow containers first. A full pot of chili cools slowly, even in the fridge, and bacteria multiply while it does.

Rice is the special case. According to CDC, Bacillus cereus spores survive cooking. If cooked rice sits at room temperature, they germinate and can form a toxin that reheating doesn’t destroy. Reheating can’t undo slow cooling, so getting rice cold quickly is what counts; still reheat it to 165°F. Our leftover rice guide explains why rice behaves differently.

The leftover clock runs from cooking, not from the package date

USDA’s 3-to-4-day window for cooked leftovers starts the day the food was cooked. The date on the package the ingredients came in doesn’t change it.

Package dates mean less than people think. FDA says a “use by” date on most foods is a quality guideline, not a food safety date. The exception is infant formula and some baby foods, which must be used by the date on the package.

Here’s how the clock runs for a pot of chili cooked Sunday night:

  • Sunday, by bedtime: split into shallow containers and refrigerated, within 2 hours of coming off the stove.
  • Wednesday or Thursday: the 3-to-4-day window closes. Eat it or freeze it by then.
  • In the freezer: safe indefinitely at 0°F, says FDA. USDA’s 3-to-4-month figure is about quality, not safety.

Smell isn’t a safety test. USDA is clear that the bacteria that cause food poisoning generally don’t change how food looks, smells, or tastes. That chili can smell perfect on day six and still be past its window. Our guide to how long leftovers really last goes deeper on the timing.

Thawing, refreezing, and the temperature to cook it to

FDA lists three safe ways to thaw: in the refrigerator, in cold water, and in the microwave. CDC explains why the counter is off the list. Bacteria multiply quickly in the parts of the food that reach room temperature.

What you can do next depends on how it thawed:

  • Thawed in the fridge: USDA says it can be refrozen without cooking, with some loss of quality, as long as it’s still inside its fridge window. That’s 1 to 2 days for ground meat and poultry, 3 to 5 days for steaks, chops, and roasts.
  • Thawed in cold water or the microwave: cook it right away, says FDA. Once it’s cooked, you can freeze the dish.
  • Past its fridge window, or left out over 2 hours: throw it out.

When “cook it first” applies, CDC’s safe internal temperatures are:

  • 145°F, then a 3-minute rest, for whole cuts of beef, pork, veal, and lamb
  • 160°F for ground beef and pork
  • 165°F for all poultry, including ground chicken and turkey
  • 165°F for leftovers and casseroles

Check with a food thermometer, especially when reheating in a microwave. The refreezing guide covers in-between cases, like meat that’s still partly icy.

After a power outage: what to keep

FDA’s outage guidance gives specific limits. Keep the doors closed while the power is out, and check thermometers before using anything once it’s back.

Appliance How long it holds with the door closed When power returns
Refrigerator About 4 hours, unopened Discard perishables (meat, poultry, seafood, milk, eggs, leftovers) that were above 40°F for more than 2 hours (FDA’s outage page says 4 hours or more; see below)
Full freezer About 48 hours FDA: food that still has ice crystals, or reads 40°F or below, can be refrozen or cooked, as long as it hasn’t sat thawed past its fridge window
Half-full freezer About 24 hours Same test: ice crystals, or 40°F or below and still inside its fridge window
No thermometer, no idea how long — Throw out the perishables, and don’t decide by appearance or odor

FDA’s two pages draw the fridge line in different places. The outage page discards at 4 hours or more above 40°F. The thermometer page vouches only for 2 hours or less. This site follows the stricter line. If a thermometer shows perishables sat above 40°F for more than 2 hours, discard them. That matches the 2-hour rule everywhere else on this page.

One rule for produce

One produce safety rule comes from FDA. Bagged greens labeled “ready to eat,” “washed,” or “triple washed” don’t need re-washing. Rinsing them again adds a chance of picking up bacteria from the sink or colander.

Sources

Written and reviewed by peter.bae for Hearth & Habit · Last reviewed October 11, 2026

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