StillGood?
/
USDA-based guidance

USDA-based · · How this page was made · Last reviewed October 10, 2026 · Sources ↓

Leftovers: the 165°F reheat rule (not just the 3–4 day window)

The answer

Cook it safely the first time. Refrigerate leftovers within 2 hours of cooking (1 hour if the room is above 90°F). Divide large batches into shallow containers so they reach 40°F fast. Eat refrigerated leftovers in 3 to 4 days, or freeze them. When you reheat, the food must reach 165°F as measured with a food thermometer — sauces, soups, and gravies to a rolling boil. Cover and rotate in the microwave; check more than one spot. Frozen leftovers may be reheated without thawing. After previously frozen leftovers hit 165°F, remaining food may be refrozen.

The 3–4 day fridge window only applies to leftovers that were cooked safely and chilled on time. Reheating has its own rule: 165°F.

Cook it safely the first time

FSIS leftovers guidance starts with safe first cook, measured with a food thermometer:

Full cook table: color is not doneness — use a thermometer.

Out of the danger zone, into shallow containers

Refrigerate within 2 hours of cooking (or of removing food from a warm hold); 1 hour if the air is above 90°F. If that clock is missed, discard it — do not “just reheat.”

Divide large amounts into shallow containers so food reaches 40°F quickly. A deep pot of soup can stay in the growth range for hours even inside a cold fridge. Habits that break this rule are covered in storage mistakes — this page does not rewrite that guide.

How long leftovers keep

Refrigerated leftovers: 3 to 4 days on the FoodSafety.gov cold chart / FSIS leftovers guidance. That fridge number is a safety window — past it, discard it, even if it smells fine. Frozen leftovers: quality about 3 to 4 months; frozen leftovers remain safe indefinitely for food-safety purposes while held at 0°F, though quality drops (FSIS). Freezer months are quality, not a second safety cliff.

Do not taste leftovers to decide. Spoilage odors are imperfect, and some pathogens do not announce themselves. When the window is up or the chill clock was missed, discard it.

Reheat to 165°F

Leftovers must reach 165°F as measured with a food thermometer. Bring sauces, soups, and gravies to a rolling boil. Cover food when reheating. In the microwave, cover and rotate; check temperature in several places (microwaves have cold spots).

It is safe to reheat frozen leftovers without thawing. After previously frozen leftovers are reheated to 165°F, remaining food may be refrozen.

Safe thawing lives in leftovers + steps-keep-food-safe guidance (and in storage mistakes). There is no separate “safe thawing” FSIS page cited here.

Picnic and buffet

Hot hold at 140°F or warmer; cold hold at 40°F or below. The clock off that hold is 2 hours, or 1 hour above 90°F.

Sources

Keep reading