Cooked Rice Left Out Overnight: Is It Safe?
Reviewed against FSA chilling & danger-zone guidance · Updated September 2026
Nutritional data sourced from USDA FoodData Central and Public Health England. Always consult a registered dietitian for personal dietary advice.
Absolutely not — cooked rice left out overnight must be thrown away. Rice is one of the riskiest foods to leave at room temperature.
Why overnight is too long
Cooked rice can contain spores of Bacillus cereus that survive cooking. At room temperature the spores germinate, and the growing bacteria produce toxins that are heat-resistant — no amount of reheating destroys them. This is why rice has the strictest handling advice of any common food: cool it within 1 hour, refrigerate, eat within 24 hours. Overnight on the counter, cooked rice is a genuine food poisoning risk ('fried rice syndrome') and must go in the bin.
You can also check the calorie content of cooked rice alongside its safety information.
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Common questions
Can I reheat cooked rice left out overnight until it's really hot?
No — Bacillus cereus toxins are heat-stable. However hot you get the rice, the toxins remain. It has to be thrown away.
What is fried rice syndrome?
It's the common name for Bacillus cereus food poisoning — typically vomiting within 1–5 hours of eating rice that sat at room temperature. It comes on fast and is thoroughly unpleasant.
How long can cooked rice sit out?
One hour, maximum — stricter than the 2-hour rule for other foods. Cool it fast, refrigerate, and eat within 24 hours.
The rice was covered — does that help?
Covering keeps flies off but does nothing about the bacteria already in the rice. Time and temperature are what matter, and overnight is far too long.
Related answers
Primary source: FSA chilling & danger-zone guidance.
The information on 247foodcheck.com is compiled from official public guidance (NHS, Food Standards Agency, USDA/FDA FoodKeeper) and is provided for general information only. It is not medical advice and does not replace guidance from your midwife, GP, health visitor or other qualified professional. When in doubt, throw it out — and if you feel unwell after eating something, contact NHS 111 or your doctor.