How to Reheat Food Safely

To reheat food safely, heat potentially hazardous food rapidly to a core of 75°C (the Food Standards Code minimum for hot-holding is 60°C, but 75°C builds in a margin), ideally within two hours, using a stove, oven or microwave — never a bain-marie or pie warmer. Check it with a probe thermometer, then serve it, hot-hold it at 60°C or above, or discard it. Reheat food only once, and for ready-to-eat leftovers left out of temperature control, apply the 2-hour/4-hour rule. Key takeaways: Reheat potentially hazardous food rapidly to a core of 75°C — the Food Standards Code minimum for reheat-to-hot-hold is 60°C, but 75°C builds in a safety margin — generally within two hours, so it spends minimal time in the 5°C-60°C temperature danger zone.. Hot-hold reheated food at 60°C or above until service. Bain-maries, pie warmers and heat lamps hold hot food, they do not reheat it — use a stove, oven or microwave to bring food up to temperature.. Reheat food only once. Portion leftovers before storage so you warm just what you need, then serve, hot-hold at 60°C+, or discard.. For ready-to-eat food left out of temperature control, apply the 2-hour/4-hour rule: under 2 hours total is safe to use or refrigerate; 2-4 hours use now and do not refrigerate; over 4 hours throw out.. Verify with a clean, calibrated probe thermometer — don't judge by steam or touch. Log readings with the free temperature-log generator where your food safety program requires it.. Reheating scenarios: what to do: Scenario, Reheating guidance. Cold cooked food for hot-holding — Reheat rapidly on a stove, in an oven or microwave to a 75°C core (at least 60°C) within 2 hours, then hold at 60°C or above. Reheat and serve straight to a customer — Heat thoroughly to a 75°C core; the hot-holding rule doesn't apply, but thorough heating remains good practice. Cooked rice or pasta — Cool fast and refrigerate at ≤5°C after cooking; reheat once to a 75°C core — B. cereus toxins can survive reheating. Leftovers out of temp control, under 2 hours — Safe to reheat and use now, or refrigerate at 5°C or below for later. Leftovers out of temp control, 2-4 hours — Use now (reheat to a 75°C core if serving hot) — do not put back in the fridge. Leftovers out of temp control, over 4 hours — Throw out — do not reheat; toxins may have formed. Food already reheated once — Serve, hot-hold at 60°C or above, or discard — never cool and reheat a second time. Bain-marie / pie warmer / heat lamp — Holding only — never use to reheat cold food. The temperature that matters: aim for a 75°C core (60°C minimum) Under the Australia New Zealand Food Standards Code (Standard 3.2.2), potentially hazardous food that is reheated to be held hot must be heated rapidly to 60°C or hotter. This is around the temperature at which the growth of most food-poisoning bacteria stops, so it is the benchmark for hot-holding, display and service. This reheating rule applies when you intend to hold the food hot — if you reheat food and serve it straight to a customer, the hot-holding rule does not apply, though heating it thoroughly is still good practice. So where does 75°C come from? It is not a Food Standards Code reheating figure — it is a widely used best-practice target, the same core temperature recommended for cooking (or a validated time/temperature combination such as 70°C for 2 minutes). Heating the coldest part of the food (the core) to around 75°C gives you a comfortable margin above 60°C, helps destroy bacteria that may have multiplied during storage, and accounts for probe placement and thermometer error. Aiming for 75°C means that even if your reading is slightly off, you are almost certainly above the 60°C minimum. For high-risk foods like poultry, minced meats and rice dishes, targeting that higher core temperature is sensible. Requirements and enforcement can vary, so confirm the specifics with your state or territory regulator or council. You can check cooking and reheating targets quickly with the free /free-tools/reheating-temperature-guide and /free-tools/safe-cooking-temperatures tools. 60°C or hotter: the minimum reheat-to-hot-hold temperature in the Food Standards Code.. ~75°C core: the common best-practice target (or a validated combination such as 70°C for 2 minutes) that builds in a safety margin.. 5°C to 60°C: the temperature danger zone where bacteria multiply fastest — move food through it quickly.. Reheat fast: beat the two-hour danger-zone window Speed is as important as the final temperature. FSANZ guidance is to reheat potentially hazardous food to 60°C or hotter, ideally in two hours or less. The longer food lingers in the 5°C-60°C danger zone, the more time bacteria have to multiply and, in some cases, produce toxins that reheating cannot destroy. Start with food that has been cooled and stored correctly. Under the Food Standards Code, two-stage cooling means cooked food generally needs to drop from 60°C to 21°C within two hours, and from 21°C to 5°C within a further four hours (unless you can show another system is safe). When you reheat, work in small or shallow batches so heat penetrates quickly and evenly, and stir liquids and casseroles part-way through. If food has not reached 60°C after a reasonable time, keep heating — do not put lukewarm food into hot-holding equipment and hope it catches up, because it usually will not. Aim to reach a 75°C core (at least 60°C) within two hours of starting to reheat.. Reheat in shallow, portioned batches rather than one large mass.. Stir and rotate food so cold spots reach temperature too.. Never use hot-holding gear to finish an under-heated batch.. The 2-hour/4-hour rule for leftovers out of temperature control Reheating only buys you safety if the food was handled correctly beforehand. For ready-to-eat potentially hazardous food that has been out of temperature control — sitting between 5°C and 60°C on a bench, buffet or delivery run — use the 2-hour/4-hour rule to decide whether it can be kept, reheated and used, or must be discarded. The clock counts total accumulated time in the danger zone, not one continuous stretch, so add up every period the food has spent out of the fridge or off hot-holding. Under two hours total, the food is safe to use now or to refrigerate at 5°C or below for later. Between two and four hours, use it straight away — reheat it rapidly to a 75°C core if you are serving it hot — but do not put it back in the fridge. Over four hours, throw it out; reheating will not make it safe, because some bacteria produce heat-stable toxins. For a quick walk-through of the timings, see the dedicated 2-hour/4-hour rule guide and the /free-tools/cooling-time-calculator. Under 2 hours out of temperature control: safe to use or refrigerate at ≤5°C.. 2 to 4 hours: use now (reheat to a 75°C core if serving hot) — do not refrigerate.. Over 4 hours: throw it out — reheating cannot undo toxin formation.. Count total accumulated time in the 5°C-60°C zone, not a single continuous period.. Choose the right method (and the wrong ones to avoid) Use equipment designed to heat food quickly: a stovetop, a conventional or combi oven, or a microwave. These raise the core temperature fast enough to clear the danger zone within the target window. The common mistake is using hot-holding equipment to do the reheating. FSANZ specifically warns against using bain-maries, pie warmers and similar equipment to reheat food, because they are designed only to keep already-hot food at 60°C — they are generally too slow and too gentle to safely reheat cold food, which can sit in the danger zone for hours. The correct sequence is: reheat rapidly on the stove, in the oven or in the microwave to at least 60°C (ideally around a 75°C core), then transfer the food into the bain-marie or hot cabinet to hold it at 60°C or above for service. Stovetop: fast for sauces, soups and stir-fries; stir constantly.. Oven / combi oven: good for trays and larger cuts; check the thickest point.. Microwave: quick for single portions, but stir and stand to even out hot and cold spots.. Bain-marie / pie warmer / heat lamp: for HOLDING only — never for initial reheating.. Reheat once, then commit FSANZ advises reheating potentially hazardous food only once so it does not go through multiple warming periods. Each cool-reheat cycle sends the food back through the danger zone and gives surviving bacteria another chance to grow, so repeated reheating compounds the risk. The practical fix is portioning. Before you store leftovers, divide them into serving-sized amounts so you only ever reheat what you plan to use. Once food has been reheated, do one of three things with it: serve it immediately, hold it hot at 60°C or above until service, or — if it is not used — discard it. Reheated food that is left over should not be cooled and reheated a second time. When in doubt, throw it out; the cost of wasted food is far lower than the cost of a foodborne illness incident. Portion food before storage so you only reheat single servings.. After reheating: serve, hot-hold at 60°C+, or discard.. Do not cool and reheat the same food a second time.. Label and date stored food so older stock is used or discarded first.. Prove it: probe thermometers, records and free tools You cannot judge 60°C or 75°C by sight, steam or touch, so verification depends on a probe thermometer. Temperature control is a requirement under Standard 3.2.2, and Standard 3.2.2A adds food safety management tools for many food service, catering and retail businesses — including being able to substantiate that controls like temperature are working. A clean, calibrated probe thermometer is the practical tool for both. Insert a clean, sanitised probe into the thickest part or centre of the food — the slowest point to heat — and wait for the reading to stabilise. Check more than one spot in large or uneven batches. Sanitise the probe between different foods to avoid cross-contamination. Calibrate the thermometer regularly using an ice-slurry (0°C) or boiling-water (100°C) check, and record reheating temperatures where your food safety program or Standard 3.2.2A obligations require it. The free /free-tools/temperature-log-generator gives you a ready-made record sheet, and the /free-tools/fridge-freezer-temperature-chart helps keep storage in range beforehand. Good records both keep food safe and give an inspector clear evidence of due diligence. Check what applies to your business with your local council or state or territory regulator. Probe the core (thickest/centre point) and let the reading settle.. Sanitise the probe between foods to prevent cross-contamination.. Calibrate regularly with an ice-slurry or boiling-water check.. Log reheating temperatures with the free temperature-log generator where your program requires it.. Worked examples: Reheating a tray of curry for hot holding: A cook takes a tray of curry from the fridge to hold hot for service. They divide it into shallow portions and reheat rapidly on the stove, stirring so cold spots catch up, aiming to reach a 75°C core within two hours. A clean probe confirms the temperature before the curry goes into the bain-marie at 60°C or above, and the reading is noted on the temperature log. The bain-marie shortcut that backfires: A busy kitchen drops cold pies straight into the pie warmer to save time. Because the warmer is designed only to hold hot food, the pies sit in the danger zone for hours. The correct approach is to reheat them rapidly in the oven to a 75°C core first, then transfer them to the warmer to hold at 60°C or above. Buffet leftovers and the 2-hour/4-hour rule: A caterer has trays of ready-to-eat chicken that spent about three hours total off hot-holding during a function. Because the accumulated time is in the 2-4 hour band, the food must be used now rather than chilled for another day. Any trays that passed four hours out of temperature control are discarded — reheating would not make them safe. Checklist: Food was previously cooled and stored correctly (held at 5°C or colder), or cleared under the 2-hour/4-hour rule.. Food portioned into shallow, serving-sized amounts before reheating.. Reheated with a stove, oven or microwave — not a bain-marie or pie warmer.. Core temperature reached a 75°C core (at least 60°C) within two hours.. Temperature confirmed with a clean, calibrated probe thermometer in the thickest part.. Food reheated only once — no second cool-and-reheat cycle.. Reheated food served immediately, hot-held at 60°C+, or discarded.. Reheating temperature recorded where required by your food safety program.. Probe sanitised between different foods to prevent cross-contamination.. Common mistakes: Using a bain-marie, pie warmer or heat lamp to reheat cold food — this equipment only holds hot food and leaves food in the danger zone too long.. Reheating one large mass instead of shallow portions, so the centre never reaches 60°C.. Judging temperature by steam, sight or touch instead of probing the core with a thermometer.. Reheating the same food more than once, sending it repeatedly through the 5°C-60°C danger zone.. Putting under-heated food into hot-holding equipment and expecting it to catch up.. Ignoring the 2-hour/4-hour rule and reheating ready-to-eat food that has been out of temperature control for more than four hours.. Failing to stir microwaved or liquid foods, leaving cold spots where bacteria survive.. Assuming 60°C destroys everything — some bacteria produce heat-stable toxins that reheating cannot remove, which is why fast cooling and correct storage beforehand matter..