Food safety during heatwaves: Practical tips to prevent stock loss

Why heatwaves can lead to food being thrown away

When people think about food safety during hot weather, food poisoning is often the first thing that comes to mind. But for caterers, one of the biggest impacts of a heatwave is actually the amount of food that can no longer be served.

Once chilled food has been exposed to temperatures outside safe limits, or you can’t prove it has been stored correctly, you’re often left with only one option: dispose of it.

That could be because:

• A refrigeration unit struggles in high temperatures.
• A power supply fails at an outdoor event.
• A catering van sits in traffic longer than expected.
• Food spends too long on display during a busy service.
• Equipment can’t keep up with increased demand.

None of these situations automatically mean food has become unsafe, but they do increase the likelihood that temperatures have risen into what’s known as the ‘danger zone’ – between 8°C and 63°C, where harmful bacteria can multiply rapidly.

For self-employed caterers, that can mean losing hundreds of pounds’ worth of stock in a single day.

Alongside the immediate financial impact, stock spoilage can also lead to:

• Food contamination
• Customer illness
• Complaints and refunds
• Poor reviews and reputational damage
• Investigation by environmental health officers
• Business interruption while problems are resolved

That’s why preventing food spoilage should be just as much a priority as preventing food poisoning. In most cases, the two go hand in hand.

Do food safety regulations change during a heatwave?

The simple answer is no.

The legal requirements around food hygiene and temperature control remain exactly the same, regardless of the weather. However, maintaining those standards becomes considerably more difficult when refrigeration is working harder, food is being transported in hotter conditions and you’re serving customers outdoors for long periods.

As a food business, you’re still responsible for:

• Following food hygiene regulations.
• Keeping chilled food at safe temperatures.
• Preventing food contamination.
• Monitoring food storage appropriately.
• Ensuring food remains safe to eat before it’s served.

Rather than changing the rules, a heatwave simply means you may need to increase the frequency of your checks and put additional control measures in place.

Understanding safe food temperatures

One of the best ways to avoid unnecessary stock loss is to understand the temperatures you’re working with.

Many caterers know the recommended figures, but during busy service it’s easy to rely on assumptions instead of checking.

Current UK guidance recommends:

During a heatwave, checking temperatures more frequently can help identify problems before they become costly.

Preventing food spoilage during a heatwave

While no caterer can control the weather, there are plenty of practical steps you can take to reduce the chances of losing valuable stock.

Heatwaves place additional strain on refrigeration equipment, increase food handling risks and shorten the amount of time food can safely remain outside temperature-controlled storage.

By making a few adjustments to your daily routine, you can often prevent small issues from becoming expensive problems.

Some of the most effective ways to reduce stock spoilage include:

• Checking refrigeration temperatures more frequently throughout the day.
• Servicing refrigeration equipment before the busiest summer period.
• Avoiding overloading fridges, allowing cold air to circulate properly.
• Keeping fridge and freezer doors closed whenever possible.
• Rotating stock regularly so older products are used first.
• Planning deliveries for cooler parts of the day where possible.
• Having contingency plans in place if refrigeration equipment fails.

These checks may only take a few extra minutes, but they could save hundreds of pounds in wasted food.

Food storage during hot weather

One of the biggest challenges for caterers is keeping food at safe temperatures throughout the day.

Indoor food storage

If you’re preparing food from a commercial kitchen or unit, consider:

• Monitoring fridge temperatures more regularly
• Avoiding overloading refrigeration units
• Allowing good airflow around stored products
• Keeping fridge doors closed whenever possible
• Checking door seals are functioning correctly
• Scheduling deliveries during cooler parts of the day

Even well-maintained refrigeration equipment can struggle during periods of extreme heat.

Outdoor food storage

Outdoor catering environments create additional challenges.

Direct sunlight, high ambient temperatures, and limited refrigeration capacity can all increase the risk of food spoilage.

Good practice includes:

• Keeping food in shaded areas
• Using commercial-grade cool boxes or refrigerated units
• Limiting the amount of food displayed at any one time
• Storing raw and ready-to-eat foods separately
• Rotating stock regularly
• Keeping food covered whenever possible

The less time food spends exposed to warm conditions, the lower the risk.

Catering events during a heatwave

For many caterers, summer events are the busiest and most profitable time of year.

Unfortunately, they’re also where stock losses are most likely to happen.

Outdoor events often combine long trading hours, temporary power supplies, high customer demand and limited preparation space. Even if your equipment performs perfectly, food is usually exposed to warmer conditions for much longer than it would be in a permanent kitchen.

The key is preparation.

Before arriving on site, ask yourself:

• Will reliable power be available all day?
• Is there sufficient refrigeration capacity?
• Do I have backup cooling equipment?
• Have I planned for particularly hot weather?
• Is there somewhere shaded to store food?
• What happens if refrigeration fails?

Thinking through these scenarios before the event means you’re far less likely to find yourself making difficult decisions about disposing of stock halfway through service.

Prepare smaller batches

One of the easiest ways to reduce food waste is simply to prepare and replenish food in smaller quantities.

Rather than bringing everything into the serving area at once, top up little and often.

If temperatures rise unexpectedly, you’ll have significantly less food exposed and much less stock at risk.

A useful rule to remember

For temporary catering events, food safety guidance does allow some flexibility.

Generally:

Hot food can be kept below 63°C for up to two hours.

Chilled food can be kept above 8°C for up to four hours.

However, these limits shouldn’t be viewed as targets.

During a heatwave, food temperatures can continue rising rapidly, particularly in direct sunlight or busy serving areas. If you’re unsure whether food has remained safe, the safest option is always to dispose of it rather than risk making a customer ill.

Losing stock is never ideal, but protecting your customers must always come first.

Mobile catering: Protecting food while you’re on the move

For mobile caterers, heatwaves bring another challenge: transport.

Even on a warm day, the temperature inside a catering van can climb surprisingly quickly, particularly if you’re stuck in traffic or making multiple stops before reaching an event. Every extra minute outside controlled refrigeration increases the pressure on your cold chain.

Unlike fixed premises, mobile businesses often have fewer opportunities to recover if temperatures begin to rise. That’s why planning ahead is just as important as the equipment you use.

Keep the cold chain intact

The cold chain refers to keeping chilled food at a safe temperature from the moment it’s collected or prepared until it’s served.

Breaking that chain, even briefly, can increase the risk of spoilage and may mean food has to be disposed of if you can’t be confident, it has remained safe.

To reduce the risk:

• Use insulated food containers designed for commercial catering.
• Invest in portable refrigeration or refrigerated vehicles where appropriate.
• Keep chilled products together and avoid opening cool boxes unnecessarily.
• Use ice packs or cooling blocks to help maintain temperatures.
• Load refrigerated items last so they’re exposed to ambient temperatures for the shortest possible time.

Plan your journey

Traffic jams, road closures and event queues are all part of catering life, but they can also leave food sitting in rising temperatures for longer than expected.

Before setting off:

• Plan the quickest route.
• Allow time for delays.
• Minimise unnecessary stops.
• Check refrigeration equipment before leaving.
• Monitor temperatures if travelling long distances.

Good planning won’t stop the weather, but it can stop small delays turning into expensive stock losses.

Food contamination risks in hot weather

Heatwaves don’t just affect food temperatures.

They can also increase contamination risks.

Increased pest activity

Hot weather naturally increases insect activity, and uncovered food quickly becomes attractive to flies and other pests.

Simple precautions can make a big difference:

• Keep food covered whenever possible.
• Remove food waste regularly.
• Empty bins before they become overloaded.
• Store waste away from preparation areas.
• Keep preparation surfaces clean throughout service.

Keep waste managed effectively and ensure food preparation areas remain protected.

Staff hygiene challenges

Hot weather can make working conditions uncomfortable, which may impact hygiene standards if not managed properly.

Encourage everyone working with food to:

• Frequent handwashing
• Regular glove changes where appropriate
• Adequate hydration breaks
• Clean work clothing

Small lapses can quickly become larger problems in busy service environments.

Temperature monitoring: More important than ever

During a heatwave, temperature monitoring should become a priority.

Recording temperatures helps:

• Demonstrate compliance
• Identify problems early
• Protect customers
• Provide evidence if issues arise

Areas worth monitoring include:

• Refrigerators
• Freezers
• Hot holding equipment
• Transport containers
• Refrigerated vehicles

Digital thermometers and temperature logging systems can make this process easier and more accurate.

What to do if food has been exposed to unsafe temperatures

Despite best efforts, problems can happen.

If food has been exposed to unsafe temperatures, avoid making assumptions.

Consider:

• How long the food has been affected
• The type of food involved
• Whether temperature records are available
• Whether the food can be verified as safe

When in doubt, it’s usually safer to dispose of potentially unsafe food than risk customer illness.

While nobody wants to lose stock, the cost of a food poisoning incident can be far greater.

The financial impact of food spoilage

Most caterers focus on food safety because they care about their customers.

But there are business risks too.

Stock spoilage

A refrigeration failure during a heatwave can result in significant stock losses, particularly for businesses holding large quantities of chilled products.

Food contamination claims

If customers become ill after consuming contaminated food, businesses may face investigations, legal costs and reputational damage.

Equipment breakdown

Heatwaves put refrigeration equipment under extra pressure.

Unexpected failures can leave caterers without the means to safely store food until repairs are carried out.

Business interruption

Equipment failures, event cancellations or enforcement action can all affect your ability to trade.

Taking food safety seriously helps protect both your customers and your livelihood.

Final preparations for this summer’s heatwaves

Heatwaves present additional challenges for every catering business, but they don’t have to lead to food safety issues.

By planning ahead, maintaining effective temperature control, monitoring food carefully and training staff appropriately, caterers can continue operating safely even during periods of extreme heat.

Ultimately, food safety isn’t just about compliance. It’s about protecting your customers, preserving your reputation and ensuring your business can continue to thrive throughout the summer months.

When temperatures rise, preparation is your best defence.

How Catering Insurance can protect your food stock

Even the most experienced caterers can’t control every situation.

Power cuts, refrigeration failures and extreme weather can all lead to stock having to be disposed of, despite following best practice.

That’s why many catering businesses choose insurance that protects more than just public liability.

Protectivity’s catering insurance is designed specifically for food businesses and includes protection for a range of risks that become even more important during the summer months. Depending on the level of cover you choose, this can include frozen and portable stock, equipment theft or damage, business interruption, and public and product liability of up to £10 million.

Optional extras, including employers’ liability, catering trailer cover and buildings insurance, allow you to tailor your policy to the way you work.

While good food safety practices are always your first line of defence, having the right insurance in place means you’re better prepared if the unexpected does happen, helping you recover more quickly and get back to doing what you do best: serving great food with confidence.

Find out more about Protectivity’s flexible catering policies and get covered in minutes.

*Disclaimer – This blog has been created as general information and should not be taken as advice. Make sure you have the correct level of insurance for your requirements and always review policy documentation. Information is factually accurate at the time of publishing but may have become out of date.