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Food Danger Zone Calculator — Is Your Food Still Safe?

Find out exactly how long your food has been in the danger zone and if it's still safe to eat.

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The USDA Danger Zone: 40°F–140°F (4°C–60°C)

Bacteria multiply rapidly in this range. Food left out for more than 2 hours (1 hour above 90°F) should be discarded — even if it looks and smells fine.

Frequently Asked Questions

What is the food danger zone?
The danger zone is the temperature range between 40°F (4°C) and 140°F (60°C) where bacteria like Salmonella and Staphylococcus multiply most rapidly. According to the USDA, bacteria can double every 20 minutes in this range.
How long can cooked meat sit out?
Cooked meat should not sit out for more than 2 hours at room temperature, or 1 hour if the ambient temperature is above 90°F (32°C). After that, discard it — don't taste it to test.
Can I reheat food that's been out too long?
No. Reheating does not make food safe if it has been in the danger zone too long. Some bacteria produce heat-resistant toxins that remain even after cooking.
Why does the 1-hour rule apply in hot weather?
Above 90°F (32°C), bacteria multiply much faster. The USDA shortens the safe window to 1 hour to account for the accelerated bacterial growth in outdoor summer conditions.
How does a meat thermometer help with food safety?
An instant-read thermometer lets you verify food reaches a safe internal temperature before serving, and helps you quickly check if food cooling or warming is still in the safe zone.

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