Storage & shelf life
How to cool and reheat cooked food safely
A practical UK and US guide to cooling cooked food promptly, refrigerating it safely and reheating it evenly.
Direct answer
Cool promptly, refrigerate within two hours and reheat the portion you need
Key Takeaways
The safe sequence starts when the meal ends
- Put cooked food in the refrigerator within two hours.
- Divide large amounts into smaller or shallow containers.
- UK guidance says reheat only once and until steaming hot throughout.
- US guidance says reheat leftovers to 165°F / about 74°C.
- Stir or turn microwave-heated food to reduce cold spots.
- Do not rely on reheating to rescue food with an unknown cooling history.
A common leftovers question
Can I freeze food again after reheating previously frozen leftovers?
The answer is not the same in the UK and the US. Check the country guidance that applies to you, then use the handling limits below.
United Kingdom
FSA and NHS Inform guidance says leftovers should be reheated only once. Do not plan to freeze a reheated remainder for another later reheat. Freezing does not create another reheat allowance. This is different from cooking previously frozen raw food, cooling it safely and freezing the cooked dish.[1] [2] [7]
United States
USDA says a remaining portion of previously frozen leftovers can be refrozen after reheating to 165°F / about 74°C. This is not permission for repeated cycles with uncertain handling. Cool promptly in shallow containers and refrigerate within two hours, or within one hour when the air is above 90°F / about 32°C.[3] [6]
If food was left out longer than the applicable limit or you do not know how it was handled, do not try to rescue it by reheating or freezing. Portioning food before reheating is usually the simpler way to avoid repeating the sequence.
What official guidance says
Food Standards Agency guidance for England, Northern Ireland and Wales says leftovers should be cooled and put in the fridge within two hours. It says to reheat leftovers only once and until they are steaming hot throughout.[1]
NHS Inform gives the same two-hour cooling limit for Scotland. It says splitting food into smaller portions can help it cool more quickly and that reheated food should be steaming hot all the way through.[2]
USDA says to cool food rapidly to the refrigerator temperature of 40°F or below. It says large amounts should be divided into shallow containers and leftovers should reach 165°F when reheated.[3]
A simple cooling sequence
| Step | What to do | Why it helps |
|---|---|---|
| Divide | Put large amounts into smaller or shallow containers. | Smaller amounts cool more quickly.[2] [3] |
| Refrigerate | Move cooked food into the refrigerator within two hours. | UK and US consumer guidance uses this household limit.[1] [3] [5] |
| Cover and label | Use clean covered containers and record what the food is and when it was stored. | Covered storage protects the food and the label helps you apply the relevant storage guidance. |
| Reheat a portion | Take out the amount you plan to eat and heat it evenly. | This avoids repeatedly warming the whole batch. |
Should hot food cool on the worktop first?
United Kingdom: cool hot or warm food as quickly as possible before refrigerating it. FSA guidance says to do this within one to two hours. NHS Inform says smaller portions can help food cool more quickly.[7] [2]
United States: USDA says hot food can go directly into the refrigerator. Divide a large pot into shallow containers first or use an ice or cold-water bath for rapid cooling if suitable.[3]
How to reheat food safely
United Kingdom
Reheat leftovers until they are steaming hot throughout rather than warm. FSA and NHS Inform say leftovers should be reheated only once. Stir food on the hob and check that it is hot through the centre. Smaller portions can heat more evenly.[1] [2]
United States
Reheat leftovers to 165°F / about 74°C with a food thermometer. Bring sauces, soups and gravies to a rolling boil. USDA says to stir, cover and rotate microwave-heated food and allow standing time for even heating.[3] [4]
UK and US guidance compared
| Question | United Kingdom | United States |
|---|---|---|
| How soon should food be refrigerated? | Within two hours.[1] [2] | Within two hours. Use one hour when the air temperature is above 90°F / about 32°C.[3] [5] |
| How should food be reheated? | Steaming hot throughout and only once.[1] [2] | To 165°F / about 74°C.[3] [4] |
| What is the refrigerator target? | 0°C to 5°C in NHS Inform guidance.[2] | 40°F / 4°C or below.[3] [5] |
Microwave, hob and oven tips
Microwaves can leave cold spots. Use a suitable microwave-safe container. Follow package or appliance instructions where available. Stir, turn or rotate the food then allow the stated standing time before checking the centre.[1] [4]
On the hob, stir frequently and heat the food through. Under US guidance, sauces, soups and gravies should come to a rolling boil. USDA does not recommend using a slow cooker, steam table or chafing dish to reheat leftovers because the food may stay in the danger zone too long.[4]
Do not reheat uncertain food
Reheating is not a reset button. If food was left out beyond the applicable limit or you do not know how it was cooled, a normal smell or appearance cannot confirm it is safe. The cautious decision is to discard it.
For the complete country comparison on how long properly cooled leftovers keep, read How long do leftovers last in the fridge?. For food that has thawed, read Can you refreeze thawed food?.
Practical conclusion
Divide, cool, refrigerate and reheat an appropriate portion evenly. Put cooked food in the fridge within two hours. In the UK, reheat only once and until steaming hot throughout. In the US, reheat leftovers to 165°F / about 74°C. Do not use reheating to rescue food with an unsafe or unknown cooling history.
Frequently Asked Questions
How to cool and reheat cooked food safely FAQs
Can I put hot food straight in the fridge?
USDA says hot food can go directly into the refrigerator. Divide large amounts into shallow containers so they cool quickly. UK guidance says to cool cooked food as quickly as possible and refrigerate it within two hours.
Should I wait until food is completely cold before refrigerating it?
No. Waiting on the worktop until food is completely cold can use up the two-hour cooling period. Divide large amounts so they cool faster and refrigerate them promptly.
Can I reheat leftovers twice?
UK FSA and NHS Inform guidance says leftovers should be reheated only once. US guidance focuses on safe storage and reheating leftovers to 165°F or about 74°C.
Can I freeze food again after reheating previously frozen leftovers?
UK guidance says leftovers should be reheated only once, so do not plan to freeze a reheated remainder for another reheat. USDA says a remaining portion can be refrozen after reheating to 165°F or about 74°C if it was handled safely. Portioning food before reheating is the simpler way to avoid repeating the sequence.
What temperature should reheated leftovers reach in the US?
USDA says reheated leftovers should reach 165°F or about 74°C as measured with a food thermometer.
How do I know food is reheated safely in the UK?
FSA and NHS Inform guidance says the food should be steaming hot throughout rather than merely warm.
Can smell tell me whether cooled food is safe?
No. A normal smell does not prove that food was cooled or stored safely. Use the time, temperature and storage history.
References
Official sources
England, Northern Ireland and Wales source · 1
Food Standards Agency - Cooking your foodReviewed 9 October 2026
Scotland source · 2
NHS Inform - Preparing and cooking food safelyReviewed 9 October 2026
United States source · 3
USDA FSIS - Leftovers and Food SafetyReviewed 9 October 2026
United States source · 4
USDA FSIS - What methods of reheating food are safe?Reviewed 9 October 2026
United States source · 5
U.S. FDA - Are You Storing Food Safely?Reviewed 9 October 2026
England, Northern Ireland and Wales source · 7
Food Standards Agency - How to chill, freeze and defrost food safelyReviewed 9 October 2026
United States source · 6
USDA FSIS - Freezing and Food SafetyReviewed 9 October 2026
RecallBite editorial note: RecallBite is an independent aggregator of public official information. It is not a regulator or medical provider. This guide cannot assess a particular food from a description, smell or appearance. Check the linked official source and follow current package instructions and official notices.