Six Essential Guidelines for Freezing Foods in Commercial Kitchens
The freezing of foods, whether raw or cooked, is a technical process designed to prolong shelf-life. However, this extension of usability is finite and requires controlled handling. Freezing limits or halts the growth of bacteria, but it rarely kills them. This is especially true for psychrotrophic pathogens such as Listeria monocytogenes, which can survive sub-zero temperatures. To ensure food safety, the following six criteria must be mastered by all kitchen staff.
1.0 Managing Cooked Foods and Thermal Shock
When freezing foods that have been cooked, they should never be left at ambient temperatures for extended periods. While two hours is the absolute maximum, in a hot commercial kitchen (27°C to 32°C+), this window reduces to just 40 minutes.
Critically, you must cool freshly cooked food as quickly as possible before freezing. Placing warm items into a freezer causes “thermal shock” to the surrounding products, raising the ambient temperature and causing existing frozen stock to partially defrost and refreeze. This alters the texture, taste, and safety of the food.
2.0 Protocols for Defrosted Foods
Items that have thawed can be refrozen, but only if the cold chain was never broken. These foods must have been defrosted in a refrigerator at 5°C or below, kept for fewer than three days, and must be sealed in airtight packaging to prevent freezer burn and oxidation.
3.0 Refreezing Commercial Deliveries
Stock delivered in a frozen state should be moved immediately to the freezer to maintain the cold chain. If a product has begun to thaw during transit, it should be treated as a refrigerated item and used within 72 hours rather than being refrozen without further processing.
Retail packaging is often permeable to air and unsuitable for long-term commercial freezing. To prevent degradation and freezer burn, always provide additional airtight wrapping or vacuum-seal products before placing them into deep storage. This protects the cellular structure of the food and maintains the chef’s quality standards.
4.0 Freezing by Expiry and Best Before Dates
You may freeze foods on or before their expiry date provided the cold chain has been maintained. However, freezing foods after the expiry date is a high-risk practice. While freezing “pauses” the clock, it does not reverse the accumulation of pathogens. As a general rule: when the expiry date passes, the risk to the consumer increases exponentially.
5.0 High-Risk Items: The Ice-Cream Factor
Ice-cream is a unique risk in the kitchen. For service and buffet display, it is often kept at temperatures warmer than -18°C to allow for scooping. It is only safe to refreeze ice-cream if it is slightly softened but has remained cold. If ice-cream melts completely outside of the freezer, it must be discarded. Pathogens like L. monocytogenes thrive in the sugary, moist environment of melted dairy, leading to potential outbreaks if refrozen and served later.
6.0 Quality Storage Temperature Guide
The following table serves as a guide for maintaining the quality of frozen products. Note that while food may remain “safe” at -18°C for longer, the flavour and moisture levels will degrade over time.
| Food Category | Refrigeration (5°C) | Freezer (-18°C) |
|---|---|---|
| Fresh Poultry (Whole) | 1 to 2 Days | 1 Year |
| Hamburger & Ground Meats | 1 to 2 Days | 3 to 4 Months |
| Steaks & Roasts | 3 to 5 Days | 6 to 12 Months |
| Soups & Stews | 3 to 4 Days | 2 to 3 Months |
| Leftovers (Cooked Meat) | 3 to 4 Days | 2 to 6 Months |
| Salads (Egg, Tuna, Macaroni) | 3 to 5 Days | Does not freeze well |
By adhering to these six guidelines, you ensure that your kitchen operates at the highest HFS standards. For further technical details, consult our article on Temperature Control in the Kitchen or learn more about the risks associated with Listeria monocytogenes.