HACCP by Process

Cooling Food Safely UK: 90-Minute Rule & HACCP Controls

Cooling is one of the most dangerous stages in food production because food passes through the entire danger zone (63C down to 8C) where bacteria multiply most rapidly. Spore-forming organisms like Clostridium perfringens survive cooking and thrive during slow cooling, doubling every 10-15 minutes in their optimal range. The FSA recommends cooling cooked food from 63C to below 8C within 90 minutes. Slow cooling has been linked to some of the largest food poisoning outbreaks in the UK. This article covers practical methods to meet the 90-minute target, what equipment helps, and what to do when cooling takes too long.

Key takeaways

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

Divide large batches into shallow containers (max 50mm deep) to increase cooling speed

Blast chillers are the most reliable method for high-volume operations

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

Record start time, start temperature, end time, and end temperature for every cooling batch

Quick Answer: Cool Cooked Food as Quickly as Possible

Cooked food that will be chilled for later service should be cooled from hot holding or cooking temperature to below 8C as quickly as possible. A common UK hospitality benchmark is to cool from 63C to below 8C within 90 minutes, then refrigerate. The purpose is to move food quickly through the danger zone where Clostridium perfringens and Bacillus cereus can multiply. Large pots, deep trays, rice, sauces, curries, stews and joints of meat need active cooling; leaving them on a worktop until they feel cool is not a control.

Cooling Time and Temperature Targets

Standard target: cool from 63C to below 8C within 90 minutes. Stricter operational target: get chilled food to 5C or below once refrigeration is complete. Two-stage method where documented: cool from 63C to 21C within 90 minutes, then from 21C to 5C within a total of 6 hours. Rice and other starchy foods: cool as quickly as possible, ideally within 1 hour, then refrigerate because Bacillus cereus spores can survive cooking and produce heat-stable toxins. Whichever target you use, state it in your HACCP plan, train staff on it, and record start time, end time, start temperature, end temperature and corrective action.

Practical Cooling Methods

Blast chillers are the most effective cooling tool, capable of bringing food from 70C to 3C within 90 minutes. If you produce large volumes of cooked food for later service, a blast chiller is a worthwhile investment and will make your cooling CCP far easier to manage. Without a blast chiller, several techniques can speed cooling. Divide large batches into smaller, shallow containers (no more than 50mm deep) to increase the surface area exposed to cold air. Transfer hot food from deep cooking pots to wide, shallow trays before refrigerating. Use an ice bath: place the container of hot food in a sink or large tray filled with ice and cold water, stirring regularly. Stirring is important because it breaks up the hot core and brings it into contact with the cold container walls. Ice paddles (frozen plastic paddles filled with water) can be stirred directly through soups, sauces, and stews. For solid items like joints of meat, slice or portion before cooling. Never place large quantities of hot food directly into a standard fridge - this raises the fridge temperature and compromises everything else stored inside.

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Cooling Rice, Sauces, Curries and Large Batches

Rice, pasta, sauces, curries, soups and stews are frequent cooling failures because they hold heat in the centre. Spread rice thinly on clean trays, cool quickly, and refrigerate within your documented limit. Decant sauces, soups and curries into shallow pans no deeper than 50mm, stir regularly, and use an ice bath or blast chiller. Slice large joints before cooling where the product allows it. Do not cover hot food tightly during the first cooling stage because the lid traps steam and slows cooling; protect food from contamination while allowing heat to escape. Once the food has cooled, cover, label, date, and move to chilled storage.

Monitoring and Recording Cooling

Cooling is a CCP that needs monitoring and records like any other. Probe the food at the start of cooling (the temperature when it leaves the heat source), and again at the 90-minute mark. The target is below 8C at 90 minutes, or below 21C if you use the two-stage approach. If using a blast chiller, most units display the core probe temperature and the cycle time. Record the start time, start temperature, end time, and end temperature for each batch cooled. If the 90-minute target is not met, assess the situation: food that has reached below 21C can continue cooling but must reach below 8C within the total 6-hour window. Food that is still above 21C at 90 minutes should be discarded, because it has spent too long in the high-risk zone. Record any corrective actions taken. Review cooling records regularly to identify patterns - if the same product consistently misses the target, the method needs adjusting (smaller portions, different container, blast chiller).

Common Cooling Failures and How to Avoid Them

The most frequent cooling failure is trying to cool a large volume in a deep container. A 10-litre pot of curry or soup can take 6-8 hours to cool below 8C without intervention, far exceeding the safe limit. The fix is simple: decant into multiple shallow containers. Another common failure is placing hot food in the fridge too early, raising the internal temperature above 8C and putting other stored items at risk. Let food cool to approximately 60C before placing it in the fridge (this should take no more than 10-15 minutes), or use a blast chiller. Leaving food to cool on the worktop "until it stops steaming" without monitoring the time is another risky habit - staff may forget about it, and several hours can pass unnoticed during a busy service. Setting a timer when cooling starts is a simple control. Finally, stacking containers of cooling food prevents air circulation and insulates the inner containers, dramatically slowing the process. Leave gaps between containers in the fridge or blast chiller.

What to do next

Set up a cooling station with ice baths and shallow containers

Designate a sink or large tray as your cooling station. Keep shallow containers and ice paddles ready so staff can begin cooling immediately without searching for equipment.

Start a timer every time you begin cooling

Use a kitchen timer or smartphone alarm set for 90 minutes. Probe the food when the alarm goes off and record the result. This prevents food being forgotten during busy service.

Evaluate whether a blast chiller would benefit your operation

If you regularly cool large batches and struggle to meet the 90-minute rule, a blast chiller will pay for itself in reduced waste and simpler HACCP compliance.

Common mistakes to avoid

Mistake

Cooling a large pot of soup or stew without decanting it

Instead

A deep container of hot liquid can take 6+ hours to cool. Divide into shallow containers (no more than 50mm deep) and use ice baths or a blast chiller.

Mistake

Leaving cooling food unmonitored on the worktop

Instead

Always set a 90-minute timer when cooling starts, and probe the food when it goes off. Unmonitored cooling is one of the most common causes of food poisoning outbreaks.

Frequently asked questions

How quickly should cooked food be cooled in the UK?

A common UK food business target is to cool cooked food from 63C to below 8C within 90 minutes, then refrigerate. Some HACCP plans use a documented two-stage method, but the control must be monitored and recorded.

Can I put hot food straight in the fridge?

Small portions can go into the fridge, but large volumes of hot food will raise the fridge temperature and affect other stored items. Cool to approximately 60C first (10-15 minutes), or use a blast chiller. Never leave food at room temperature for hours waiting for it to cool naturally.

What is a blast chiller and do I need one?

A blast chiller is a specialised unit that uses high-speed cold air to rapidly cool food from cooking temperature to below 3C, typically within 90 minutes. It is strongly recommended for any operation that regularly cools large volumes of food.

How do I cool rice safely?

Spread rice thinly in clean shallow trays, cool it as quickly as possible, ideally within 1 hour, then refrigerate. Do not leave rice sitting warm at room temperature because Bacillus cereus can produce toxins that reheating may not destroy.

What is the 2 hour 4 hour rule?

The 2 hour 4 hour rule is a time-control concept for food outside temperature control, not a replacement for a cooling procedure. For planned cooling in a HACCP system, use your documented cooling target, such as 63C to below 8C within 90 minutes.

What should I do if food has not cooled within 90 minutes?

If the food is below 21C, it can continue cooling but must reach below 8C within 6 hours total. If it is still above 21C at the 90-minute mark, the safest course is to discard it. Record the failure, investigate the cause, and adjust your cooling method.

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