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November 7, 2026
Whether you run a busy restaurant kitchen, serve meals in a care home or simply cook for your family, the food you prepare needs to be safe to eat. Keeping it at the right temperature is one of the most effective ways to make sure it is. For chefs, kitchen managers and anyone responsible for food safety, knowing these temperatures is essential, as a few degrees in the wrong direction can give harmful bacteria the chance to grow.
In this guide, we explain what the temperature danger zone is, how long food can safely spend in it under UK rules, and how to keep food out of it at every stage. You’ll also find a free chart that you can download and display in your kitchen.
Table of Contents
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What Is the Temperature Danger Zone?
The temperature danger zone is the range of temperatures in which harmful bacteria grow and multiply quickly on food. In the UK, the danger zone is between 8°C and 63°C. Food left in this range for too long can make people ill, even if it looks, smells and tastes completely normal.
These two figures come from UK food hygiene rules. Chilled food must be kept at 8°C or below, which is a legal requirement in England, Wales and Northern Ireland and recommended in Scotland. Hot food that isn’t being served straight away must be kept at 63°C or above. As best practice, fridges should be set to 5°C or below to give you a safety margin.
Bacteria grow fastest at around 37°C, the same temperature as the human body. In the right conditions, some can double in number about every 20 minutes, so a few hundred bacteria on a cooked chicken breast left on the side can become well over 100,000 in three hours. Cold temperatures slow this growth but don’t kill bacteria, whereas thorough cooking will kill most of them.
Why Do Some Sources Give Different Temperatures?
You may see slightly different figures depending on where you look. Some older UK material gives the danger zone as 8°C to 60°C, but as hot food must be held at 63°C or above, 63°C is the figure to work to. Others use 5°C to 63°C, based on the recommended fridge temperature. American sources use 41°F to 135°F (FDA Food Code) or 40°F to 140°F (US consumer advice), which don’t apply to UK food businesses.
Temperature Danger Zone Chart
The chart below shows the key temperatures you need to know, from the freezer to the oven.
| Stage | Safe temperature |
|---|---|
| Freezer | −18°C or below |
| Fridge | 5°C or below |
| Chilled food (legal limit) | 8°C or below |
| Danger zone | 8°C to 63°C |
| Hot holding | 63°C or above |
| Cooking | 70°C for 2 minutes in the centre of the food |
| Reheating | Steaming hot all the way through, at least 75°C for 30 seconds (82°C in Scotland) |
| Cooling | As quickly as possible, ideally within 90 minutes |
Which Foods Are Most at Risk?
Bacteria grow best on food that is moist and high in protein, so some foods need much closer temperature control than others. These high-risk foods are usually ready to eat, which means they won’t be cooked again before someone eats them. They include:
- cooked meat and poultry
- fish and shellfish
- milk, cream, cheese and other dairy products
- eggs and egg dishes, such as quiche
- cooked rice and pasta
- gravies, sauces and soups
- sandwiches and prepared salads
Cooked rice needs particular care. Uncooked rice can contain bacterial spores that survive cooking, and if cooked rice is left at room temperature, they can produce toxins that reheating won’t destroy. Our guide on whether you can reheat rice explains more.
How Long Can Food Stay in the Danger Zone?
Food should spend as little time in the danger zone as possible. However, UK rules allow food to be out of temperature control for a short time while it’s on display or being served, such as on a buffet or a hot counter.
Hot food can be kept below 63°C for up to 2 hours. After that, it should be cooled as quickly as possible to 8°C or below, or thrown away. Cold food can be kept out of the fridge for up to 4 hours. If it has been out for less than 4 hours, it can go back in the fridge, but after 4 hours it must be thrown away.
It’s important to note that each allowance can only be used once for the same food. For example, a tray of sandwiches that has been on display for three hours and then goes back in the fridge can’t be put out again. Writing down the time food goes out is the easiest way to keep track during a busy service.
You may also see a “2-hour rule” that drops to 1 hour above 32°C. This comes from American consumer advice and isn’t the rule for UK food businesses.
What If Food Has Been in the Danger Zone Too Long?
If you aren’t sure how long food has been left out, throw it away. You can’t tell whether food is unsafe by looking at it or smelling it, and reheating won’t always help, as some bacteria produce toxins that heat doesn’t destroy. Then find out what went wrong, such as a hot cabinet switched on too late, and record what you did about it.
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How to Keep Food Out of the Danger Zone
Food can enter the danger zone at almost any stage, from delivery to service. Here’s how to keep it at a safe temperature at each step.
Deliveries
Check that chilled deliveries are at 8°C or below and that frozen food is still frozen solid, and reject anything that isn’t. Put chilled and frozen items away straight away, rather than leaving them on the side while you finish another job.
Fridge and Freezer Storage
Fridges should be set to 5°C or below and freezers to −18°C or below. Most commercial units have a built-in temperature display, and checking and recording it at least once a day shows that your food is being stored safely.
Try not to overfill your fridge, as cold air needs space to circulate. A packed fridge can develop warm spots where food creeps into the danger zone without anyone noticing.
Defrosting
Frozen food should never be defrosted at room temperature, as the outside will warm up into the danger zone long before the middle has thawed. The safest way is slowly in the fridge, in a covered container on the bottom shelf so it can’t drip onto other foods.
If you need to defrost something more quickly, raw meat or poultry can be thawed in a sealed container under cold running water, or you can use a microwave’s defrost setting. Make sure food is fully defrosted before cooking, unless the manufacturer’s instructions say to cook it from frozen.
Cooking
To kill harmful bacteria, food needs to be cooked until the centre reaches 70°C and stays there for 2 minutes. The higher the temperature, the less time this takes: 30 seconds at 75°C, and just 6 seconds at 80°C. Lower temperatures work too, but much more slowly. At 60°C, food needs 45 minutes to be safe, which is far too slow for most kitchens.
Poultry, pork, rolled joints, burgers, sausages and kebabs must always be cooked all the way through, with clear juices and no pink meat. Whole cuts of beef and lamb, such as steaks, only need to be sealed on the outside, because any bacteria will be on the surface rather than inside the meat.
Hot Holding
Once food has been cooked, keep it at 63°C or above until it’s served. Hot cabinets and bain-maries are designed to keep food hot, not to heat it up, so preheat the equipment and only put food in once it’s already piping hot. Check the temperature with a probe regularly during service, not just at the start.
Cooling
Cooling is one of the stages where food most often ends up in the danger zone. A large pot of soup or a deep tray of rice can stay warm in the middle for hours, even when the top feels cool.
Cooked food should be cooled as quickly as possible, ideally within 90 minutes, and then refrigerated. Splitting large batches into shallow containers, standing pans in iced water or using a blast chiller will all speed things up. Avoid putting a large pot of hot food into a full fridge, as it will warm everything around it.
Reheating
When you reheat food, it must be steaming hot all the way through. If you’re using a probe, the centre should reach at least 75°C for 30 seconds. In Scotland, the law requires reheated food to reach at least 82°C
Food should only be reheated once. Each time it’s cooled and reheated, it passes through the danger zone again, giving bacteria another chance to grow.
How to Check Food Temperature the Right Way
The most reliable way to check food temperature is with a probe thermometer. Insert it into the centre or thickest part of the food, away from bone and the bottom of the pan, as these give a false reading. Clean and disinfect the probe after every use, especially between raw and cooked food.
Check regularly that your probe is accurate. In iced water, it should read between −1°C and 1°C, and in boiling water between 99°C and 101°C. Infrared thermometers are handy for checking deliveries, but they only read the surface temperature, so always use a probe for cooked food. If you use the Food Standards Agency’s Safer Food, Better Business pack, record your daily checks in its diary.
Common Mistakes That Put Food in the Danger Zone
Many temperature problems in kitchens come down to a few everyday habits. Watch out for these common mistakes:
- Defrosting food on the worktop overnight instead of in the fridge.
- Overfilling the fridge, which blocks the airflow and creates warm spots.
- Trusting the hot cabinet’s display without probing the food itself.
- Topping up buffet dishes with fresh food, so nobody knows how long the food underneath has been out.
- Cooling food in deep containers, which keeps the centre warm for hours.
- Assuming food is safe because it’s within its use-by date, even though it hasn’t been kept cold enough.
- Not checking that your probe thermometer is accurate, so every reading could be wrong.
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Free Temperature Danger Zone Chart
To help your team remember the key temperatures, we’ve created a free temperature danger zone chart. It covers everything in this guide on a single page. Download it below and display it where your team will see it every day, such as by the pass or on the fridge door.
Food Hygiene Training for Your Team
Knowing the right temperatures is only part of keeping food safe, as everyone in your kitchen needs to put them into practice on every shift. Our Level 2 Food Hygiene and Safety for Catering course covers temperature control for anyone who handles food. If you manage a kitchen or supervise staff, our Level 3 Food Hygiene and Safety course goes further, covering HACCP, food safety law and training your team.
Frequently Asked Questions (FAQ)
What temperature kills bacteria in food?
Most harmful bacteria are killed when the centre of the food reaches 70°C and stays there for 2 minutes. Higher temperatures work faster, such as 75°C for 30 seconds or 80°C for 6 seconds. However, some bacteria produce spores or toxins that survive cooking, which is why cooked food still needs to be cooled and stored correctly.
Is room temperature within the danger zone?
Yes. Most rooms are between 18°C and 24°C, which sits right in the middle of the danger zone. This is why perishable food shouldn’t be left out on the side for long, whether it’s cooling, defrosting or waiting to be served.
What temperature should you reheat leftovers to?
Leftovers should be reheated until they’re steaming hot all the way through. If you’re using a probe thermometer, the centre should reach at least 75°C for 30 seconds. In Scotland, food businesses must reheat food to at least 82°C. You should only reheat leftovers once.
How often should food temperatures be checked?
There’s no single legal rule for how often to check. Your food safety management system, such as Safer Food, Better Business or your HACCP plan, should set this based on your menu and service. A good routine is to check fridges and freezers at least once a day, probe food on display regularly during service, and record every reading.
What happens if food is left in the danger zone overnight?
It should be thrown away. Even if it looks, smells, and tastes normal, several hours at room temperature is more than enough for bacteria to reach levels that cause food poisoning. There’s no visual or smell test that reliably catches this — when in doubt, the safe move is to discard it.
Is the temperature danger zone the same in Scotland?
The danger zone itself is the same, at 8°C to 63°C, but a few rules differ. In Scotland, keeping chilled food at 8°C or below is recommended rather than set in law, and reheated food must reach at least 82°C. If you run a food business in Scotland, check Food Standards Scotland’s guidance.
Is room temperature in the danger zone?
Yes. Most rooms are between 18°C and 24°C, which sits right in the middle of the danger zone. This is why perishable food shouldn’t be left out on the side for long, whether it’s cooling, defrosting or waiting to be served.
Can you put hot food straight in the fridge?
You shouldn’t put a large amount of very hot food straight into the fridge, as it will warm up everything else inside. Cool it quickly first by splitting it into shallow containers or using an ice bath, then refrigerate it, ideally within 90 minutes.
Does freezing kill bacteria?
No. Freezing stops bacteria from growing, but most of them survive. Once the food thaws, they can start to multiply again, which is why you should defrost food in the fridge and cook it thoroughly.
Can bacteria grow in the fridge?
Some bacteria, including Listeria, can grow slowly at fridge temperatures. This is why chilled food still has a use-by date, even when it’s kept at 5°C or below.
What happens if food is left out overnight?
It should be thrown away. Several hours at room temperature gives bacteria plenty of time to grow, and some produce toxins that reheating won’t destroy. There’s no reliable way to tell whether the food is safe by smelling or looking at it.
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