Temperature Danger Zone
The temperature range between 40°F and 140°F (4°C and 60°C) where harmful bacteria multiply rapidly.
Danger Zone Range: 40°F to 140°F • 4°C to 60°C • Max exposure limit: 2 hours
The Temperature Danger Zone is a critical food safety concept defined by the USDA and food safety agencies worldwide. It refers to the temperature range between 40°F and 140°F (4°C and 60°C). In this environment, harmful pathogens and bacteria—such as Salmonella, Escherichia coli (E. coli), and Staphylococcus aureus—multiply at an exponential rate, doubling their population in as little as 20 minutes. If perishable food is left in this zone for too long, the bacterial load can reach levels that cause severe foodborne illness, producing toxins that are not destroyed by subsequent cooking.
Under standard food safety guidelines, perishable food must never remain in the Temperature Danger Zone for more than 2 hours. If the ambient room temperature is above 90°F (32°C), this limit drops to 1 hour. Hot foods must be held above 140°F and cold foods kept below 40°F to prevent bacteria from replicating.
Leaving cooked leftovers on the counter to cool to room temperature for hours before refrigerating. This keeps the food in the danger zone, allowing bacteria to multiply rapidly.
In the UK and Australia, the danger zone is defined similarly as 5°C to 60°C. The safety principles are identical.
Refer to these limits when handling raw meats, storing leftovers, planning buffets, or cooling baked custards.
Cool hot food quickly by dividing large batches into shallow containers before refrigerating, reducing the time spent in the danger zone.