What is the food danger zone?
The food danger zone is the temperature band in which bacteria multiply fastest. The USDA defines it as 40–140 °F (4–60 °C). According to the USDA, food should not be left in this range for more than two hours, or one hour when the temperature is above 90 °F (32 °C). USDA guidance also notes that bacteria can double in as little as 20 minutes in this range.
Why do the limits differ between countries?
A few degrees of difference between sources is normal, because each was written for a different purpose:
| Source | Cold limit | Hot limit | Note |
|---|---|---|---|
| USDA (US, consumer guidance) | 40 °F (4 °C) | 140 °F (60 °C) | The most widely quoted range |
| FDA Food Code (US, foodservice) | 41 °F (5 °C) | 135 °F (57 °C) | Model code for commercial kitchens |
| UK (gov.uk) | 8 °C legal maximum, 5 °C recommended in practice | 63 °C | Minimum for hot holding |
Practical advice: pick one rule for your HACCP plan and write it down. Using the most cautious limits makes records and training simpler: keep cold food at 4 °C or below and hot food at 63 °C or above. See what HACCP is for the plan structure.
Safe cooking temperature chart
These are the USDA's safe minimum internal temperatures. Measure with a thermometer at the thickest part of the food.
| Food | °C | °F | Rest |
|---|---|---|---|
| Beef, veal, lamb: steaks, chops, roasts | 63 | 145 | 3 minutes |
| Ground meat and meat mixtures | 71 | 160 | None |
| Poultry (all, including ground) | 74 | 165 | None |
| Pork | 63 | 145 | 3 minutes |
| Fish and shellfish | 63 | 145 | None |
| Egg dishes | 71 | 160 | None |
| Leftovers and casseroles (reheating) | 74 | 165 | None |
A chef's service preference and a safety minimum are different things: we cover that in the steak doneness chart.
Time and temperature work together
Safety is not only about degrees. The UK's official guidance gives 70 °C at the core for 2 minutes as the standard, along with equivalents:
| Core temperature | Time needed |
|---|---|
| 60 °C | 45 minutes |
| 65 °C | 10 minutes |
| 70 °C | 2 minutes |
| 75 °C | 30 seconds |
| 80 °C | 6 seconds |
Storing, cooling and holding rules
| Situation | Rule |
|---|---|
| Refrigerator | 4 °C (40 °F) or below |
| Freezer | −18 °C (0 °F) or below |
| Hot holding | 63 °C (145 °F) or above |
| Room temperature | 2 hours at most, 1 hour above 32 °C (90 °F) |
| Cooling (FDA Food Code) | 57 °C to 21 °C within 2 hours, then to 5 °C within 6 hours in total |
| Reheating | To 74 °C (165 °F) |
Thaw food in the refrigerator, in cold water or in the microwave, not on the counter. Dividing large pots into shallow containers speeds up cooling.
How to apply this in a kitchen
- 1Keep a calibrated thermometer. Looking at food is not a measurement.
- 2Keep temperature logs for refrigerators, hot holding and deliveries.
- 3Write corrective actions so everyone knows what to do when a limit is missed.
- 4Train the team. Formal training is a starting point, not a substitute for daily discipline. The other core topic is cross-contamination.
If you want to build these logs and routines, see kitchen consulting and operations improvement. You may use these tables in your own training or articles with a credit and a link to this page.
