Storing and Reheating Leftovers: Common Questions Answered
Storing and Reheating Leftovers: straight answers to the questions people actually ask, with the figures behind them.
How to cool, store and reheat cooked food so bacteria do not have time to multiply.
Key takeaways
- Refrigerate within: 2 hours of cooking, or 1 hour if the room or outdoors is above 90°F (32°C)
- Use refrigerated leftovers within: 3 to 4 days
- Most useful single change: Divide large amounts into shallow containers so they cool quickly in the refrigerator.
- Commonest mistake: Leaving food out to cool on the counter for hours before refrigerating it.
- See a doctor if any of the signs under "When to speak to a doctor" below apply to you.
What is Storing and Reheating Leftovers?
How to cool, store and reheat cooked food so bacteria do not have time to multiply.
Why does it matter?
Bacteria grow fastest between 40°F and 140°F (4°C to 60°C), and some produce toxins that reheating does not destroy, so timing matters as much as temperature.
Refrigerate within for Storing and Reheating Leftovers?
2 hours of cooking, or 1 hour if the room or outdoors is above 90°F (32°C).
Use refrigerated leftovers within for Storing and Reheating Leftovers?
3 to 4 days.
Reheat to for Storing and Reheating Leftovers?
165°F (74°C); bring sauces, soups and gravies to a rolling boil.
Frozen leftovers for Storing and Reheating Leftovers?
Safe indefinitely at 0°F (-18°C); best quality within about 3 to 4 months.
What is the single most useful thing to do?
Divide large amounts into shallow containers so they cool quickly in the refrigerator.
What is the most common mistake?
Leaving food out to cool on the counter for hours before refrigerating it.
When should I see a doctor?
See your doctor if vomiting or diarrhea lasts more than a few days, comes with a high fever or blood, or affects someone who is pregnant, very young, older or has a weakened immune system. Call 911 for severe dehydration, confusion or fainting.
More questions, answered
Is it safe to put hot food straight in the refrigerator?
Yes. USDA advises refrigerating food promptly rather than letting it cool on the counter. Splitting large amounts into shallow containers helps food cool quickly without warming up other items in the refrigerator.
Can I reheat leftovers more than once?
Food reheated to 165°F (74°C) is safe, but each round of cooling and reheating adds time in the danger zone and lowers quality. It is better to reheat only the portion you plan to eat and leave the rest in the refrigerator.
Why is reheated rice sometimes mentioned as a risk?
Cooked rice can carry spores of Bacillus cereus, which survive cooking. If rice sits at room temperature, the spores can grow and produce toxins that reheating does not destroy. Cool rice quickly, refrigerate it within 2 hours and use it within a few days.
Is pizza left out overnight safe to eat?
No. Pizza with cheese, meat or vegetables is perishable, and food left at room temperature for more than 2 hours should be thrown out. Reheating it does not reliably make it safe, because some bacterial toxins survive heat.
Does freezing kill bacteria?
No. Freezing at 0°F (-18°C) stops bacteria from growing, but most survive and become active again as food thaws. Thaw food safely and cook or reheat it thoroughly.
If leftovers smell fine, are they safe?
Not necessarily. Spoilage bacteria cause bad smells and slime, but most bacteria that make people ill do not change how food looks, smells or tastes. Go by how long food has been stored and how it was handled, not by smell.
Related topics
- What the Guidance Really Says About Meal Planning (Nutrition)
- Batch Cooking: Sorting the Evidence From the Noise (Healthy Recipes)
- Food and Water Safety Abroad: Sorting the Evidence From the Noise (Travel Health)
- Storing Medicines: What Published Guidance Supports (Medicines Safety)
Where to go next
- The First Steps With Storing and Reheating Leftovers
- Storing and Reheating Leftovers: Just the Figures
- Storing and Reheating Leftovers — the reference entry
- Food Safety: The Complete Guide
- Food Recalls: Sorting the Evidence From the Noise
- Raw Milk: Sorting the Evidence From the Noise
When to speak to a doctor
See your doctor if vomiting or diarrhea lasts more than a few days, comes with a high fever or blood, or affects someone who is pregnant, very young, older or has a weakened immune system. Call 911 for severe dehydration, confusion or fainting.
Where this comes from
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarized or generalized beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to your doctor, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 911.
Spotted something wrong? Report an error on this page. We correct on the page and say what changed.
