Critical Control Points

CCP: Cooling Procedures - Time-Temperature Requirements

Cooling Procedures: Time-Temperature Critical Limits

Cooling cooked food is one of the highest-risk stages in any food operation. The danger zone between 63C and 8C is where pathogenic bacteria multiply most rapidly, with some species doubling every 20 minutes under ideal conditions. Spore-forming organisms like Clostridium perfringens and Bacillus cereus survive cooking and germinate during slow cooling. UK guidance requires food to pass through the danger zone as quickly as possible, ideally reaching below 8C within 90 minutes. This article covers the science behind cooling CCPs, practical methods, and what to do when cooling takes too long.

Key takeaways

Cool cooked food from 63C to below 8C within 90 minutes

Clostridium perfringens is the primary pathogen risk during cooling, and its toxins survive reheating

Use blast chillers where available; otherwise use shallow containers, ice baths, and regular stirring

Never place large volumes of hot food directly into a standard fridge

Discard food that remains above 21C after 90 minutes of cooling

The 90-Minute Cooling Rule

The FSA recommends that cooked food should be cooled from 63C to below 8C within 90 minutes. This timeframe limits the growth of Clostridium perfringens, which is the primary concern during cooling. C. perfringens spores survive cooking and germinate between 50C and 15C, with optimal growth around 43-47C. The 90-minute window ensures that food does not spend enough time in this optimal growth range for toxin-producing levels of bacteria to develop. Some businesses adopt a stricter two-stage approach: cool from 63C to 21C within 90 minutes, then from 21C to 5C within a further 4 hours. This two-stage method, common in the US under FDA guidance, is equally acceptable in the UK provided total cooling time does not exceed 6 hours and the food is stored below 5C once cooled. Whichever method you choose, document it in your HACCP plan as your critical limit.

Practical Cooling Methods

Blast chillers are the gold standard for cooling CCPs. A commercial blast chiller can reduce food from 70C to 3C within 90 minutes for loads up to 30kg. If you have one, use it. Divide large volumes into smaller, shallower containers - no more than 75mm deep - to increase the surface area exposed to cold air. If you do not have a blast chiller, use a combination of techniques: transfer food to shallow stainless steel containers, place containers in an ice bath (ice water, not just ice), stir food regularly to distribute heat, and then transfer to the refrigerator once below 21C. Never place large volumes of hot food directly into a standard refrigerator - this raises the ambient temperature and compromises other stored food. For rice, cool within 1 hour and refrigerate immediately. Rice is a particular risk for Bacillus cereus, which produces heat-stable toxins that cannot be destroyed by reheating.

Monitoring Cooling as a CCP

Monitoring cooling requires both time and temperature checks. Start the clock when food is removed from the heat source or cooking equipment. Take temperature readings at defined intervals: at the start, at 30 minutes, at 60 minutes, and at 90 minutes. Use a calibrated probe thermometer to check the core temperature of the densest part of the food. For batch cooling, probe the container that will cool slowest (the fullest or deepest one). Record the time and temperature on your cooling log. If using a blast chiller with a built-in probe, the chiller log can serve as your CCP record, but verify the probe accuracy during your calibration schedule. Set clear triggers: if food has not reached 21C by 90 minutes, initiate corrective action immediately.

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Corrective Actions for Cooling Failures

If food has not cooled to below 8C within your critical limit timeframe, you have limited options. First, assess the situation: if food is still above 21C at the 90-minute mark, the safest corrective action is to discard it. C. perfringens can reach dangerous levels (more than 100,000 CFU/g) within 3 hours at temperatures between 20C and 50C, and once toxins are produced, reheating will not destroy them. If food is between 8C and 21C at the 90-minute mark, you may extend cooling using a blast chiller or ice bath, provided total cooling time does not exceed 6 hours. Record the decision, the temperatures at each check, the corrective action taken, and the name of the person making the decision. Any food that has been in the danger zone for more than 6 hours total must be discarded regardless of its final temperature.

What to do next

Map your cooling process

Identify every product you cool after cooking, document the method used (blast chiller, ice bath, ambient), and verify each one meets the 90-minute target.

Stock shallow cooling containers

Purchase stainless steel gastronorm pans no deeper than 75mm and ensure enough are available for your busiest service period.

Create a cooling log template

Design a simple form with columns for product, start time, 30-min temp, 60-min temp, 90-min temp, and action taken. Train all staff to complete it.

Common mistakes to avoid

Mistake

Leaving food to cool at room temperature indefinitely

Instead

Ambient cooling alone is rarely fast enough. Always use active cooling methods such as blast chillers, ice baths, or shallow containers with stirring.

Mistake

Putting a large pot of hot soup directly into the fridge

Instead

This raises fridge temperature and may push other foods into the danger zone. Transfer to shallow containers first, cool to below 21C, then refrigerate.

Mistake

Assuming reheating fixes a cooling failure

Instead

C. perfringens toxins are heat-stable. If food has spent too long in the danger zone during cooling, reheating will not make it safe.

Frequently asked questions

Can I cool food overnight in the fridge?

Only if the food reaches below 8C within the 90-minute critical limit, or within 6 hours using the two-stage method. Placing a large container of hot food in a domestic or underpowered fridge overnight will almost certainly exceed these limits. Monitor with a probe to verify.

How do I cool rice safely?

Spread cooked rice thinly on a clean tray or baking sheet. It should reach room temperature within 1 hour. Refrigerate immediately once cool. Never leave rice at room temperature for more than 1 hour. Bacillus cereus spores germinate rapidly in rice, producing toxins that are not destroyed by reheating.

Is a two-stage cooling method acceptable in the UK?

Yes. The two-stage method (63C to 21C in 90 minutes, then 21C to 5C in 4 hours) is widely accepted. Document whichever method you use as your critical limit in the HACCP plan and monitor accordingly.

Do blast chillers need calibrating?

Yes. Blast chiller probes should be calibrated alongside your other temperature monitoring equipment, at least monthly. Also verify the unit reaches its target temperature by periodic validation with an independent probe.

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