The temperature range between 5 degrees C and 60 degrees C in which food-poisoning bacteria grow most rapidly.
The temperature range between 5 degrees C and 60 degrees C in which food-poisoning bacteria grow most rapidly. The temperature danger zone is the band of temperatures, from 5 degrees C to 60 degrees C, where bacteria that cause food poisoning multiply fastest. Under the Australia New Zealand Food Standards Code, keeping potentially hazardous food out of this zone is one of the core principles of temperature control. Bacteria present in food are unlikely to grow to dangerous numbers while food is kept colder than 5 degrees C or hotter than 60 degrees C, but within the zone they can double in number in as little as 20 minutes. The danger zone matters because most bacteria that cause illness do not change the look, smell or taste of food. Food can carry enough bacteria to make someone sick while appearing perfectly normal. That is why the Food Standards Code and state health regulators focus on temperature limits and elapsed time rather than sensory checks. Controlling how long food spends in the danger zone, and how quickly it passes through it, is the practical basis of safe food handling in Australian food businesses. In a typical Australian kitchen this means cold food is stored at or below 5 degrees C and hot food is held at or above 60 degrees C. Fridges are set so that food, not just the air, stays at or below 5 degrees C, and hot holding units such as bain-maries keep food at or above 60 degrees C. Staff use a probe thermometer to check the core temperature of food rather than relying on the appliance dial. Food does have to pass through the danger zone during normal preparation, cooking, cooling and reheating, and that is allowed. The key is to minimise the total time spent there. When food cannot be kept out of the zone, businesses rely on the 2-hour / 4-hour rule to decide whether ready-to-eat food is still safe to use, refrigerate or throw away. A cafe leaves a tray of cooked chicken on the bench during a busy lunch service. Staff record the time it comes out of hot holding. Because the chicken is ready-to-eat and sitting within the danger zone, they apply the 2-hour / 4-hour rule: used or refrigerated within 2 hours it is fine, between 2 and 4 hours it must be used and not returned to the fridge, and beyond 4 hours it is discarded.
Frequently asked questions
What are the exact limits of the temperature danger zone?
The danger zone is 5 degrees C to 60 degrees C. Cold food should be kept at or below 5 degrees C and hot food at or above 60 degrees C.
Why is 5 degrees C to 60 degrees C considered dangerous?
Food-poisoning bacteria grow fastest in this range and can double roughly every 20 minutes, quickly reaching numbers that can cause illness.
Can I tell if food has been in the danger zone too long by smell?
No. Most food-poisoning bacteria do not change the smell, taste or appearance of food, so you must rely on temperature and time controls instead.
Is it ever acceptable for food to be in the danger zone?
Yes. Food passes through the zone during preparation, cooling and reheating. The aim is to keep that time as short as possible and apply the 2-hour / 4-hour rule to ready-to-eat food.
Does the danger zone apply to all foods?
It matters most for potentially hazardous foods, which need temperature control to stay safe. Shelf-stable foods such as dry or canned goods are not affected in the same way.
