The danger zone for food is the temperature range where harmful bacteria multiply rapidly, increasing the risk of food poisoning. Whether you work in a restaurant, café, pub, school, care home, food factory or workplace kitchen, understanding food temperatures is essential.
In this guide, we explain the temperatures you need to know, how long food can safely remain in the danger zone, and the practical steps you can take to reduce the risk of bacterial growth.
What is the temperature danger zone of food?
The danger zone for food is the temperature range between 8°C and 63°C, where harmful bacteria can multiply rapidly and increase the risk of food poisoning.
Although the term “danger zone” is not defined in UK food safety legislation, it is widely used in food safety guidance and training to describe the temperatures between the legal requirements for chilled food storage and hot holding.
The Food Standards Agency (FSA) explains that bacteria grow most rapidly between 8°C and 63°C, making effective temperature control one of the most important ways to reduce the risk of foodborne illness. Food should therefore be kept below 8°C or above 63°C wherever possible.
UK food safety temperatures explained
Some food safety temperatures are legal requirements, while others come from guidance published by the Food Standards Agency (FSA).
| Food state | Target temperature | Legislative or guidance source |
| Best practice refrigeration | 0°C–5°C | Recommended by the Food Standards Agency to help slow bacterial growth and maximise food safety. |
| Maximum chilled storage | 8°C | Required by Schedule 4 of the Food Safety and Hygiene (England) Regulations 2013 (and equivalent regulations in Scotland, Wales and Northern Ireland) for many chilled foods. |
| Danger zone | 8°C–63°C | A recognised food safety concept explained by the Food Standards Agency. |
| Hot holding | 63°C or above | Required by Schedule 4 of the Food Safety and Hygiene (England) Regulations 2013, unless a specific exemption applies. |
| Thorough cooking | 75°C (or equivalent) | Recommended by the Food Standards Agency to achieve safe cooking temperatures and destroy harmful bacteria. |
Why is the danger zone for food so important?
Many raw foods naturally contain low levels of bacteria, and additional contamination can occur during storage, preparation or handling. If food is then kept between 8°C and 63°C, these bacteria can multiply rapidly, increasing the risk of food poisoning. The higher the temperature within the danger zone and the longer food is kept there, the faster bacterial growth can occur.
Common foodborne bacteria affected by poor temperature control include:
Salmonella
If contaminated food is kept between 8°C and 63°C, Salmonella can multiply rapidly. Keeping food chilled below 8°C slows bacterial growth, while cooking to a safe core temperature destroys the bacteria.
Symptoms: Diarrhoea, stomach cramps, fever, nausea and vomiting. While most people recover within a week, severe dehydration or bloodstream infections can occur, particularly in young children, older adults and people with weakened immune systems, and may require hospital treatment.
Campylobacter
Unlike many other foodborne bacteria, Campylobacter does not usually multiply outside its host. However, poor temperature control can increase the risk of cross-contamination. Keeping raw poultry chilled below 8°C reduces bacterial survival and limits the spread of bacteria to ready-to-eat foods, while thorough cooking destroys the bacteria.
Symptoms: Severe diarrhoea (sometimes bloody), stomach cramps, fever and vomiting. Although most people recover, infection can occasionally lead to serious complications such as Guillain-Barré syndrome, reactive arthritis or bloodstream infection.
Escherichia coli (E. coli)
Pathogenic E. coli can multiply quickly when contaminated food is left between 8°C and 63°C. Refrigeration below 8°C slows bacterial growth, while thorough cooking destroys the bacteria before food is eaten.
Symptoms: Severe stomach cramps, diarrhoea (which may be bloody), vomiting and fever. Certain strains, particularly E. coli O157, can cause haemolytic uraemic syndrome (HUS), a life-threatening condition that can lead to kidney failure.
Listeria monocytogenes
Unlike most foodborne bacteria, Listeria can continue to grow at refrigeration temperatures. Storing chilled food at 5°C or below, rather than close to the legal maximum of 8°C, slows bacterial growth and helps protect vulnerable people, particularly pregnant women, older adults and those with weakened immune systems.
Symptoms: Fever, muscle aches, nausea and diarrhoea. In vulnerable people, listeriosis can cause septicaemia, meningitis, miscarriage, stillbirth or severe illness in newborn babies, making it one of the most serious foodborne infections.
Clostridium perfringens
Clostridium perfringens produces spores that survive cooking. If cooked food is cooled too slowly or kept between 8°C and 63°C, the spores can germinate and the bacteria multiply rapidly. Rapid cooling and hot holding above 63°C help prevent this.
Symptoms: Severe abdominal cramps and diarrhoea, usually developing 6–24 hours after eating contaminated food. While illness is often short-lived, it can be severe in older adults and, in rare cases, cause life-threatening intestinal damage.
Bacillus cereus
Often associated with cooked rice, pasta and other starchy foods, Bacillus cereus also produces spores that survive cooking. Leaving these foods between 8°C and 63°C allows the bacteria to multiply and produce toxins that reheating may not destroy.
Symptoms: Nausea, vomiting, abdominal cramps and diarrhoea. Although symptoms usually resolve within 24 hours, toxin-producing strains can occasionally cause more severe illness, particularly in vulnerable individuals.
How long can food stay in the danger zone?
Food should pass through the danger zone (8°C–63°C) as quickly as possible during preparation, cooling and service to minimise bacterial growth.
For consumers, Food Standards Scotland recommends keeping refrigerated food out of the fridge for no longer than 1–2 hours, and advises that food left out for serving, such as at a party, should be discarded after 4 hours if it has not been refrigerated.
For food businesses, the legal requirements are more flexible because food must sometimes be removed from temperature control during normal operations. For example, food may be above 8°C while it is being prepared, portioned, transported between workstations or placed on display. In these situations, businesses should keep food out of temperature control for the shortest time reasonably practicable and ensure their food safety procedures demonstrate that the food remains safe. This approach is based on the temperature control defences set out in the Food Safety and Hygiene (England) Regulations 2013, Schedule 4.
Food businesses should establish appropriate temperature controls, monitoring procedures and corrective actions as part of their HACCP-based food safety management system.
What temperature do bacteria die?
There isn’t a single temperature that instantly kills all bacteria. Instead, bacteria are destroyed by a combination of temperature and time. Generally, the higher the temperature, the less time it takes to destroy harmful bacteria.
The Food Standards Agency (FSA) recommends cooking food until it reaches a core temperature of 75°C, or an equivalent time and temperature combination, to destroy the harmful bacteria that cause food poisoning. However, this recommendation assumes the centre of the food reaches the target temperature, not just the surface.
It is important to understand that not all bacteria behave in the same way:
- Most harmful bacteria, including Salmonella, Campylobacter and pathogenic E. coli, are destroyed by thorough cooking.
- Spore-forming bacteria, such as Clostridium perfringens and Bacillus cereus, produce heat-resistant spores that can survive normal cooking. If cooked food is cooled too slowly or left within the danger zone, the spores can germinate and the bacteria multiply rapidly.
- Some bacteria produce toxins that are not destroyed by reheating. For example, Bacillus cereus and Staphylococcus aureus can produce toxins if food is left at unsafe temperatures for too long. Once these toxins have formed, reheating the food may kill the bacteria but will not make the food safe to eat.
This is why cooking alone is not enough. Safe food handling also depends on rapid cooling, correct refrigeration, thorough reheating, effective hot holding and minimising the time food spends between 8°C and 63°C.
If the temperature of cold food rises above 8°C should it be thrown away?
Food does not automatically become unsafe when its temperature rises above 8°C. The appropriate action depends on why the temperature increased, how long the food has been above 8°C, the type of food and the controls set out in your food safety management system.
For example, it is normal for chilled food to be above 8°C for short periods during preparation, portioning, transport or display. The Food Safety and Hygiene (England) Regulations 2013 recognise these situations, provided the time outside temperature control is kept to a minimum and food safety is not compromised.
If you cannot determine how long high-risk food has been above 8°C, or it has exceeded the time limits set out in your food safety procedures, it should be treated as unsafe and discarded.
Food businesses should have clear procedures for monitoring temperatures, recording any deviations and deciding when food can safely be used or must be disposed of as part of their HACCP-based food safety management system.
Does freezing food kill bacteria?
Freezing does not kill most harmful bacteria. Instead, it prevents or significantly slows their growth while food remains frozen.
Although some bacteria may die during freezing, many survive and can begin multiplying again once food is thawed and enters the danger zone (8°C–63°C). The Food Standards Agency advises that freezing preserves food by preventing bacterial growth, rather than destroying harmful bacteria.
Freezing also does not destroy bacterial spores or any heat-stable toxins that may already have formed. For example, spores produced by Clostridium perfringens and Bacillus cereus can survive freezing, while toxins produced by bacteria such as Bacillus cereus and Staphylococcus aureus are not removed by freezing or normal reheating.
For this reason, freezing should be viewed as a way of preserving food, not making contaminated food safe to eat.
Food should always be thawed safely, kept refrigerated while defrosting, and cooked thoroughly before consumption.
How to keep food out of the danger zone
Following these simple controls helps keep food out of the danger zone cooking environment where bacteria multiply most rapidly.
Store chilled food below 8°C
Keep refrigerators at 5°C or below wherever possible to provide a margin of safety below the legal maximum of 8°C. Avoid overfilling fridges, check temperatures regularly and ensure chilled food is returned to refrigeration promptly after use.
Cook food thoroughly
Cook high-risk foods until they reach a core temperature of 75°C, or an equivalent time and temperature combination. Use a calibrated food probe to check the thickest part of the food, particularly when cooking poultry, minced meat and large joints.
Keep hot food at 63°C or above
If food is being held before serving, maintain a temperature of 63°C or above to prevent harmful bacteria from multiplying. Stir food regularly where appropriate and check temperatures throughout service using a calibrated probe.
Cool cooked food quickly
Divide large portions into smaller containers, use shallow trays or cooling equipment where available, and refrigerate food as soon as it has cooled sufficiently. Rapid cooling reduces the time food remains within the danger zone.
Minimise the time food is left at room temperature
Only remove chilled food from refrigeration when it is needed for preparation, display or service. Return unused food to chilled storage as soon as possible and avoid leaving high-risk foods on worktops or serving counters longer than necessary.
Check temperatures using a calibrated probe
Use a clean, sanitised and calibrated food probe to verify cooking, chilling and hot-holding temperatures. Clean and disinfect the probe before and after each use to prevent cross-contamination.
Monitor and record temperatures
Record refrigerator, freezer, cooking, cooling and hot-holding temperatures as part of your food safety management system. Regular records help identify problems early and demonstrate that temperature controls are being followed.
Train staff in safe food handling
Ensure everyone involved in preparing, storing or serving food understands temperature control, safe cooking, cooling, reheating, cross-contamination prevention and how to use temperature probes correctly. Refresher training helps maintain good food safety practices.
Highfield Level 3 Food Safety course
Our Highfield Level 3 Food Safety course provides supervisors, managers and those responsible for food safety with the knowledge and confidence to implement effective food safety management systems, comply with UK food hygiene legislation and reduce the risk of foodborne illness.
Accredited by Highfield Qualifications, the course covers the danger zone for food, HACCP principles, food safety management, temperature control, contamination prevention, food hygiene legislation and the practical responsibilities of those managing food safety within their organisation.
Available as online eLearning, virtual classroom or face-to-face training, it helps develop the skills needed to maintain high standards of food safety and legal compliance.
Find out more about Highfield Level 3 Food Safety on our website, or call our friendly team today on 0203 011 4242 / [email protected]
Adam Clarke
Managing Director (Consulting)
