Can Rice Sit Out Overnight?
Last reviewed: May 2026
Quick answer
No, rice left out overnight is not safe to eat — and reheating will not make it safe. Cooked rice can contain Bacillus cereus spores that produce heat-stable toxins at room temperature. The USDA recommends refrigerating cooked rice within 2 hours of cooking.
Bottom line: discard it — reheating won't fix it
Rice left out overnight should always be discarded. Unlike most leftovers, improperly stored rice can produce toxins that reheating cannot destroy.
The Bacillus cereus risk
Cooked rice poses an above-average food safety risk because raw rice can contain spores of Bacillus cereus, a bacteria that survives normal boiling temperatures. When cooked rice sits at room temperature — even for just a few hours — those spores can germinate and produce two types of toxins. See the official food-safety sources used by StillSafeFood for references.
- Emetic toxin — causes vomiting, produced quickly at warm temperatures.
- Diarrheal toxin — causes diarrhea, produced more slowly.
The emetic toxin in particular is heat-stable. Reheating rice to 165°F (74°C) or higher will not destroy it. If the toxin is present, eating the rice will make you sick regardless of how thoroughly it was reheated.
The 2-hour rule applies to rice too
The USDA 2-hour rule — which recommends refrigerating all perishable cooked food within 2 hours at room temperature (1 hour above 90°F/32°C) — applies to rice. Rice left out overnight (8+ hours) has been in the danger zone (40°F–140°F) far too long and must be discarded.
How to store rice properly
- Refrigerate within 1 hour of cooking for best safety (no more than 2 hours).
- Spread in a shallow container to cool quickly before sealing.
- Store in the fridge at or below 40°F (4°C) for up to 3–4 days.
- Freeze what you won't eat within 4 days.
Frequently asked questions
Can you eat rice left out overnight?
No. Rice left out overnight should be discarded. The toxins produced by Bacillus cereus cannot be eliminated by reheating.
Why is rice dangerous if left out?
Cooked rice can harbor B. cereus spores that germinate and produce heat-stable toxins at room temperature. These toxins cannot be destroyed by reheating.
How long can cooked rice sit out safely?
No more than 2 hours at room temperature (1 hour above 90°F), per USDA guidelines. Refrigerate promptly after cooking.
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