Cooked Rice Safety: Cool and Refrigerate Leftovers Promptly

Cooked rice is a convenient leftover, but it should not sit at room temperature for hours. Bacillus cereus spores can survive cooking and may grow when cooked rice is held at unsafe temperatures. Some strains can produce a toxin in food; reheating is not a reliable way to make rice safe after it has been mishandled. FDA includes cooked rice among foods associated with B. cereus illness.

Cool and store it promptly

After cooking, serve what you plan to eat and transfer leftovers into shallow containers so they cool more quickly. Refrigerate perishable food within two hours, or within one hour when the air temperature is above 90°F, following USDA leftover guidance. Keep the refrigerator at 40°F or below. If a large pot of rice remains, divide it into smaller portions rather than leaving it on the counter to cool for an extended period.

Reheating does not undo unsafe storage

Reheat rice that has been stored safely until it is steaming hot throughout. Use a microwave or stovetop and stir so heat is distributed. Do not assume a high temperature will remove toxins that may have formed while rice sat warm. If cooked rice was left out beyond the recommended time or you do not know how it was stored, discard it. Do not taste or smell it to decide whether it is safe; harmful contamination may not be detectable that way.

Takeaway containers and packed lunches

For a packed lunch, keep rice cold in an insulated cooler with adequate ice packs, or keep it hot in an insulated container designed for that purpose. Do not leave it in a warm car or at room temperature for a long stretch. Follow the same prompt-chilling practice for rice in fried rice, casseroles, meal-prep bowls, or takeout.

If someone becomes ill

Foodborne illness may cause nausea, vomiting, cramps, or diarrhea. Seek medical advice for severe symptoms, blood in stool, signs of dehydration, or illness in a person at higher risk. Contact emergency services for severe symptoms such as collapse or confusion.

Sources and further reading

• Bad Bug Book, Second Edition: Bacillus cereus — FDA.
• Leftovers and Food Safety — USDA FSIS.

Health disclaimer

This article is for general education only. Its information and suggestions are not medical advice, diagnosis, or treatment and may not be right for everyone. Ask a qualified health professional for advice that fits your health, medications, and needs before changing your diet, exercise, supplement use, or care.