Temperature Control in Food Safety
The practice of keeping food at safe temperatures during storage, cooking, cooling, and serving to prevent bacterial growth.
Temperature control is one of the most critical aspects of food safety. Bacteria that cause foodborne illness multiply rapidly in the danger zone, the temperature range between 8°C and 63°C. Effective temperature control means keeping food out of this danger zone as much as possible: storing cold food below 8°C (ideally below 5°C), cooking food to at least 70°C for 2 minutes, keeping hot food at 63°C or above, and cooling cooked food through the danger zone as quickly as possible. Temperature monitoring and record-keeping are key requirements during EHO inspections, and poor temperature control is one of the most common reasons businesses lose marks.
Key Points
- The danger zone is 8°C to 63°C — bacteria multiply fastest between 20°C and 50°C
- Fridges: 0°C to 5°C. Freezers: -18°C or below. Cooking: 70°C for 2 minutes
- Hot holding: 63°C minimum. Cooling: below 8°C within 90 minutes
- Temperature checks must be recorded with time, reading, and who checked
- Digital monitoring provides real-time alerts and eliminates gaps in records
The Danger Zone
The danger zone is the temperature range between 8°C and 63°C where bacteria that cause food poisoning can multiply to dangerous levels. The fastest bacterial growth occurs between 20°C and 50°C, where bacteria can double in number every 20 minutes. Some bacteria, like Listeria, can grow slowly even at fridge temperatures, which is why it is important to keep fridges as cold as practical (ideally 0°C to 5°C) and to rotate stock using the first-in-first-out principle. The goal of temperature control is to minimise the total time food spends in the danger zone across its entire journey from delivery to service.
Safe Temperatures for Storage, Cooking, and Holding
Fridges should be set between 0°C and 5°C (legal maximum is 8°C but best practice is lower). Freezers should be at -18°C or below. Cooking temperatures must reach a core of 70°C for 2 minutes or 75°C instantaneously. In Scotland, reheated food must reach 82°C. Hot holding must maintain food at 63°C or above. When cooling cooked food, it should reach below 8°C within 90 minutes. Food on display can be kept outside temperature control for a maximum of 4 hours (single period), after which it must be discarded. Deliveries of chilled food should arrive at 8°C or below and frozen food at -15°C or below.
Temperature Monitoring and Records
Regular temperature monitoring is essential and must be recorded. Fridge and freezer temperatures should be checked at least once per day, ideally at the start of each shift. Use a calibrated thermometer and record the reading, time, and who checked. Cooking temperatures should be checked with a probe thermometer for every batch, especially for high-risk items like chicken, burgers, and reheated food. Probe thermometers should be cleaned and disinfected between uses. Hot-holding temperatures should be checked at least every hour during service. All records should be retained for at least 12 months. Digital temperature monitoring systems can automate much of this process and provide real-time alerts if temperatures go out of range.
Frequently Asked Questions
How often should I check fridge temperatures?
Fridge temperatures should be checked and recorded at least once per day. Best practice is to check at the start of each shift. If you have a busy service with frequent door opening, an additional check mid-shift is advisable. Digital temperature loggers can provide continuous monitoring and alert you if temperatures rise.
What should I do if my fridge temperature is too high?
If your fridge temperature is above 8°C, check the door seal, ensure the fridge is not overloaded, and verify the thermostat setting. If food has been above 8°C for more than 4 hours, it should be discarded. Record the incident, the corrective action taken, and when the temperature returned to safe levels.
Do I need a probe thermometer?
Yes. Every food business should have at least one calibrated probe thermometer. It is the only reliable way to check the core temperature of cooked food, reheated food, and deliveries. Probe thermometers should be calibrated regularly (check with boiling water at 100°C and ice water at 0°C) and cleaned between uses.
How long should I keep temperature records?
Keep temperature records for at least 12 months. EHO inspectors may ask to see historical records to verify that monitoring is consistent over time, not just on inspection day. Digital records are ideal because they are timestamped and cannot be backdated.
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