Restaurant Food Safety in a Heatwave

Managing restaurant food safety during an Australian heatwave comes down to keeping food out of the temperature danger zone when everything around you is working against it. Keep cold food at or below 5C and hot food at or above 60C, check incoming deliveries before you accept them, ease the load on your refrigeration, and shorten the time food spends unrefrigerated during transport and outdoor service. In extreme heat the danger zone between 5C and 60C is easier to enter and harder to escape, so the margin for error shrinks. Summer heat pushes commercial refrigeration harder, warms delivery vehicles, and turns outdoor events into a challenge. A heatwave does not change the rules of Standard 3.2.2 of the Food Standards Code, but it does change how carefully you have to apply them. This guide covers the pressure points and how to plan for them. How does a heatwave affect refrigeration? Commercial fridges and coolrooms are designed to remove heat, and in a heatwave they simply have more heat to fight. Rising kitchen temperatures, frequent door openings during busy service, and overloaded shelves all make units work harder and run warmer. A fridge that comfortably holds 4C in mild weather can drift above 5C on a scorching day, especially if the condenser is dusty or the room is packed. The answer is to reduce the load and keep an eye on temperatures. Do not overfill fridges, because cold air needs room to circulate. Keep condenser coils clean so units can shed heat efficiently. Open coolroom doors as little as possible, and consider staggering how you restock so you are not holding doors open through the hottest part of the day. Ways to ease refrigeration load in hot weather Avoid overpacking fridges and coolrooms so air can circulate. Keep condenser coils and filters clean before summer and during heatwaves. Minimise door openings and fix door seals that no longer close tightly. Cool hot food correctly before it goes into the fridge rather than loading it warm. Check and record temperatures more often on very hot days. How should you handle deliveries in extreme heat? Deliveries are a weak point in summer because food can warm up in a hot vehicle or while it sits on a loading dock. Always check the temperature of cold and frozen deliveries before you accept them. Cold potentially hazardous food should arrive at or below 5C, and frozen food should be frozen hard, not soft or partly thawed. Schedule deliveries for cooler parts of the day where you can, and make sure someone is ready to move stock straight into refrigeration rather than leaving it on a bench. If a delivery arrives warm, you are within your rights to reject it — record the reading, note the rejection, and follow up with the supplier. Keeping delivery and goods-in records means you can show exactly what you accepted and at what temperature. Food type Acceptable at delivery Action if out of range Cold potentially hazardous food At or below 5C Reject and record, or assess against the 2-hour/4-hour rule Frozen food Frozen hard Reject if soft or thawing Hot food in transit At or above 60C Reject if below 60C and not within safe time limits What extra care does outdoor catering and transport need? Outdoor events in summer are one of the highest-risk settings because food is exposed to direct sun and ambient heat with no walls or refrigeration nearby. Transport to the venue adds more time in the danger zone. The goal is to keep cold food cold and hot food hot from the moment it leaves the kitchen to the moment it is served. Use insulated containers and cold packs for cold food, and hot boxes for hot food, and load them at the correct temperature so they only have to hold, not cool or reheat. Keep food in the shade, out of direct sun, and take a probe thermometer so you can check on arrival and during service. The 2-hour/4-hour rule is your practical guide when refrigeration is not available. Food Standards Australia New Zealand explains how the rule works in its temperature control guidance . Applying the 2-hour/4-hour rule outdoors For ready-to-eat potentially hazardous food, total time in the danger zone under two hours means you can refrigerate it again or use it. Between two and four hours, use it straight away and do not put it back. Over four hours, discard it. In a heatwave, food heats faster, so plan smaller batches and replenish from insulated storage rather than laying everything out at once. How do you plan for the worst on a hot day? Heatwaves are also when equipment fails. Compressors work overtime and power outages become more likely, so a contingency plan matters. Decide in advance where you would move stock if a coolroom failed, keep the number of your refrigeration technician handy, and know which menu items you can drop quickly if you lose cold storage. Automated temperature alerts are especially valuable in summer because they warn you the instant a unit rises above 5C, while food is still safe to rescue. Staff wellbeing is part of food safety too. Tired, overheated staff make mistakes and are more likely to skip handwashing or temperature checks. Keep team members hydrated, rotate them out of the hottest areas, and build short temperature-check routines into the shift so monitoring does not get forgotten under pressure. A simple heatwave contingency plan Write your plan down before the hot weather arrives, because nobody thinks clearly at 40C mid-service. A workable plan names where overflow stock will go, who calls the refrigeration technician, which high-risk menu items get pulled first, and how you will communicate changes to the team. Keep spare ice packs and a working probe thermometer on hand, and confirm your alternative refrigeration actually has spare capacity rather than assuming it does. A plan that has been tested once, even informally, is worth far more than one that only exists in your head. Do not forget the small equipment Heatwaves affect more than the big coolroom. Ice machines struggle to keep up and can harbour bacteria if neglected, display fridges near windows warm quickly in direct sun, and bain-maries have to work harder to hold hot food above 60C. Check these smaller pieces of equipment as deliberately as you check the walk-in, because they often hold the ready-to-eat food that customers receive directly. Frequently asked questions What temperature should cold food stay at during a heatwave? Cold potentially hazardous food should be kept at or below 5C, the same as any other time. A heatwave does not relax the rule; it just makes holding that temperature harder, so check more often and reduce refrigeration load. Can I serve food outdoors safely in extreme heat? Yes, with planning. Use insulated hot boxes and cold packs, keep food in the shade, serve in small batches, and apply the 2-hour/4-hour rule. Discard ready-to-eat potentially hazardous food that has been in the danger zone for more than four hours. Should I reject a delivery that arrives warm? If cold food arrives above 5C or frozen food is thawing, you can reject it. Record the temperature and the rejection, and follow up with the supplier so the problem is fixed rather than repeated. How often should I check fridge temperatures in a heatwave? More often than usual. Many kitchens increase from once or twice a day to several checks during extreme heat, and automated monitoring removes the guesswork by recording temperatures continuously and alerting you to any rise above 5C. Heatwaves put every fridge, delivery and outdoor event under strain, so the sooner you know a temperature is slipping, the more food you save. FoodSafety HQ monitors your units continuously and sends instant temperature alerts, so you act before food enters the danger zone. See how temperature alerts and monitoring work, or start a free trial from our pricing page .