Cold chain logistics: temperature-controlled storage and distribution
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Cold chain logistics is the process of keeping temperature-sensitive products within a set temperature range at every stage between production and the customer's door: storage, picking, packing, and delivery. If the temperature goes outside that range at any point, the product can become unsafe, lose its effectiveness, or simply become unsellable, even if every other stage was handled perfectly.
For ecom brands selling chilled or frozen food, medicines, or products such as live-culture supplements and preservative-free skincare, that makes the choice of fulfillment partner far more important. Temperature-controlled storage is a specialist capability, and only a small share of Third-Party Logistics (3PLS) providers offer it.
This guide covers the temperature ranges that matter, the UK rules for chilled, frozen, and pharmaceutical products, how cold chain works inside a 3PL warehouse and on the road, where it tends to break down, and the questions to ask before you hand over your stock.
What is cold chain logistics?
A cold chain is an unbroken series of temperature-controlled steps. Stock arrives at the warehouse in a refrigerated vehicle, goes into a chilled or frozen store, gets picked and packed without warming up, and travels to the customer in packaging or a vehicle that holds the right temperature until delivery. Each step relies on the one before it, so a single weak link affects the whole chain.
Temperature-controlled storage is one part of that chain: the warehouse side. Cold chain distribution is the other: packaging, carriers, and the journey to your customer. You need both to work.
The ranges below are the ones most ecom brands deal with:
Range | Typical temperature | Common products |
|---|---|---|
Frozen | -18°C or colder | Ice cream, frozen meals, meat, and fish |
Chilled food | 8°C or below by law in England, Wales, and Northern Ireland, with 5°C or below recommended | Dairy, fresh meat, ready meals, fresh pasta |
Pharmaceutical cold chain | 2 to 8°C | Vaccines, insulin, and other refrigerated medicines |
Controlled ambient | Commonly 15 to 25°C | Many medicines, chocolate, some cosmetics, and wine |
Ambient | No active temperature control | Most dry goods |
Controlled ambient is easy to overlook. A standard warehouse can reach well over 25°C in summer and fall close to freezing in winter, which is enough to melt chocolate, split creams, or take medicine outside its labeled storage conditions. If your product label gives a storage temperature, your warehouse has to meet it.
What temperature-controlled storage looks like in a 3PL warehouse
A 3PL with temperature-controlled storage runs separate chilled rooms, freezer stores, or controlled ambient zones alongside its standard racking. The equipment matters, but the processes around it decide whether your stock stays in range.
Temperature mapping: before a store is used, sensors are placed throughout it to find hot and cold spots, such as areas near doors, ceilings, and cooling units. The results show where stock can safely go and where permanent monitoring should sit. Good operators repeat mapping in summer and winter, because a store that holds temperature in January can behave differently in a July heatwave.
Continuous monitoring and alarms: calibrated sensors record temperatures around the clock and trigger an alarm if a reading drifts out of range. The alarm only helps if someone responds to it at 3 a.m. on a Sunday, so ask who's on call.
Backup power: a power outage can take a freezer store out of range within hours. Look for backup generators and a tested plan for moving stock if equipment fails.
Cold chain goods-in: chilled and frozen deliveries should be temperature-checked on arrival and moved into storage quickly. A pallet of chilled stock left on a busy dock while the team catches up is one of the most common ways a cold chain breaks.
Picking and packing in range: pick faces for chilled stock usually sit inside the chilled area, and packing has to happen fast enough that products don't warm up before they're sealed in insulated packaging.
Batch and date control: temperature-sensitive products almost always have short shelf lives, so the Warehouse Management System (WMS) needs to track batch codes and dates and pick on a First Expired, First Out (FEFO) basis.
UK rules for temperature-controlled storage
The rules depend on what you're storing. Chilled food, frozen food, and medicines each come with their own requirements, and as with allergen labeling, responsibility stays with your brand even when the stock sits in someone else's warehouse.
Chilled food
The Food Standards Agency (FSA) states that cold food must be kept at 8°C or below, which is a legal requirement in England, Wales, and Northern Ireland. It recommends setting fridges at 5°C or below to allow for fluctuations. The Chilled Food Association points out that the 8°C requirement applies to the temperature of the food itself rather than the surrounding air, and that Scotland's requirements are worded differently.
There's a detail here that matters for ecom. According to the Chilled Food Association, mail order food is exempt from the 8°C control, but it's still subject to a general requirement that it mustn't be supplied at a temperature that could put health at risk. In practice, that means the warehouse holds chilled stock at 8°C or below, and your packaging has to keep it safe for the whole journey to the customer.
Any warehouse storing food also has to be registered as a food business with its local authority. Most food brands will also look for a recognized food safety certification, which we cover in our guide to HACCP and BRC certification.
Frozen food
Products sold as quick-frozen fall under the Quick-frozen Foodstuffs (England) Regulations 2007, with equivalent rules in the rest of the UK. The standard is -18°C or colder. The regulations allow brief periods during transport at no warmer than -15°C.
They also set record-keeping rules. Transport, warehousing, and storage of quick-frozen food must have suitable recording instruments to monitor air temperature at frequent, regular intervals, and those records must be dated and kept for at least a year. That's a useful test for any frozen 3PL: ask to see a year of temperature records.
Medicines
Storing and distributing medicines is regulated by the Medicines and Healthcare products Regulatory Agency (MHRA) under Good Distribution Practice (GDP). A 3PL distributing medicines on your behalf will normally need a wholesale dealer's license, and GDP sets clear expectations for cold chain:
Mapping before use: storage areas should be temperature mapped under representative conditions before stock goes in, and mapping should be repeated to reflect seasonal changes.
Accurate monitoring: the MHRA expects monitoring equipment in cold stores and fridges to have a calibrated accuracy of ±0.5°C.
Transport: temperatures during transport have to stay within the storage conditions on the medicine's label.
If you sell medicines, ask any 3PL for its license details and its most recent MHRA inspection outcome before anything else.
Cold chain distribution: getting it to the customer
For most ecom brands, the riskiest part of the cold chain is the last one: the parcel's journey from the warehouse to the customer. Business-to-business deliveries usually travel in refrigerated vehicles with their own temperature records. Direct-to-consumer parcels usually travel through a standard carrier network, so the packaging does the work.
Insulated packaging: chilled and frozen parcels are normally packed in insulated boxes or liners with coolants such as gel packs, ice packs, or dry ice. The right combination depends on the product, the parcel size, and how long it needs to hold temperature.
Validated pack-outs: a good cold chain 3PL tests its packaging to prove how long it holds temperature, for example 24 or 48 hours, under both summer and winter conditions. It then uses a set packing recipe for each season. A pack-out that works in March can fail in a July heatwave.
Dry ice: dry ice keeps frozen products well below zero, but it's classed as a dangerous good when shipped by air, and carriers set their own rules for accepting it. Check that your 3PL and carrier are set up for it before you build a product range around it.
Dispatch days: a chilled parcel that sits in a depot over a weekend can easily outlast its packaging. Limiting chilled and frozen dispatch to earlier in the week, on next-day or timed services, keeps parcels out of depots on the weekend. Weekend handling is limited across the market too.
Customer communication: tell customers when their order is coming and that it needs to go in the fridge or freezer straight away. Delivery to a safe place in direct sunlight can undo all the work that came before it.
Where cold chain logistics goes wrong
Most cold chain failures start with small gaps in process, usually when the warehouse is busy or the weather changes.
Waiting at goods-in: a chilled delivery arrives during a busy shift and waits on the dock until someone's free to receive it. By the time it reaches the cold store, it may already have been out of range for too long. Ask how chilled and frozen deliveries are prioritized at goods-in.
Stock in the wrong spot: in a store that hasn't been mapped, products can end up next to a door or under a cooling unit, where temperatures swing more than the average reading suggests.
Alarms with no response: monitoring that sends an alert to an empty office over the weekend doesn't protect anything. The response plan matters as much as the sensors.
Slow packing: if chilled orders are picked into an ambient packing area and wait there during a busy period, products warm up before they're packed. That risk rises during peak, when packing benches are under pressure.
The same packaging all year: a pack-out validated for winter can fail in a heatwave. Seasonal packing recipes should change on a set date or when forecast temperatures cross a threshold.
Weekend and bank holiday delays: a carrier delay that adds a day is a minor issue for most parcels and a write-off for a chilled one. Agree on bank holiday dispatch plans with your 3PL weeks ahead.
Returns: temperature-sensitive products that come back can rarely be resold, because nobody can prove they stayed in range. A 3PL that restocks returns by default needs a separate rule for your cold chain lines.
Mixed ambient and chilled orders: an order containing both ambient and chilled products has to be packed so the chilled items stay cold, which usually means insulated packaging for the whole parcel or a split shipment. Agree on how these orders work before you launch them.
Do you need a specialist cold chain 3PL?
Not every brand with one temperature-sensitive product needs a full cold chain operation. The right setup depends on how much of your range needs temperature control and what range it needs.
Mostly ambient, with controlled ambient needs: if your products only need protection from summer and winter extremes, such as chocolate or some cosmetics, a general ecommerce 3PL with a temperature-controlled ambient zone may be enough. Ask for its temperature records from last summer.
Mostly chilled or frozen: if temperature control is central to your business, look for a specialist food or pharmaceutical 3PL with validated packaging, experience with your product type, and carrier relationships built for perishables.
A mix of both: brands with a large ambient range and a smaller chilled or frozen range sometimes split fulfillment between a general 3PL and a cold chain specialist. That adds complexity, which we cover in our guide to managing a multi-3PL network, but it can be cheaper than storing an entire ambient range in a specialist warehouse.
Medicines: for licensed medicines, the 3PL's license and GDP compliance come first. The shortlist is small, and experience with your product category matters more than price.
Our guide to choosing the right type of 3PL goes into these trade-offs in more detail.
Questions to ask a cold chain 3PL
These questions separate providers who run a genuine cold chain from those who simply have a fridge. Use them alongside our questions for a 3PL discovery call, and check the answers in person with our site visit questions.
Temperature ranges: which ranges can you hold, and how much capacity do you have in each? Check there's room for your peak stock levels as well as your average.
Mapping: when were your temperature-controlled areas last mapped, and was it done in both summer and winter conditions?
Monitoring and alarms: how are temperatures monitored, and who responds to an alarm outside working hours? Ask how quickly someone would be on site.
Backup power: what happens if the power fails? Look for backup generators and a written contingency plan.
Records: can you share temperature records for the area my stock would sit in? For frozen food, ask for a full year.
Registration and certification: are you registered as a food business, and do you hold a food safety certification such as BRCGS Storage and Distribution? For medicines, ask for your wholesale dealer's license and latest MHRA inspection outcome.
Goods-in: how do you check and prioritize chilled and frozen deliveries, and what happens if one arrives out of range?
Packaging: which insulated packaging do you use, how long has it been validated to hold temperature, and when do you switch between summer and winter pack-outs?
Carriers and dispatch days: which carriers and services do you use for chilled and frozen parcels, and which days do you dispatch? Ask what happens to orders placed on a Friday.
Excursions: what happens when stock goes out of range? You want a written process covering quarantine, investigation, and how quickly you'll be told.
Experience: which brands with similar products do you already work with? Ask for a reference you can call.
Cold chain logistics FAQs
What's the difference between cold chain logistics and temperature-controlled storage?
Temperature-controlled storage is the warehouse part: chilled rooms, freezer stores, and controlled ambient zones. Cold chain logistics covers the whole journey, including storage, packing, and delivery to the customer.
What temperature should chilled food be stored at?
In England, Wales, and Northern Ireland, chilled food must be kept at 8°C or below by law. The FSA recommends setting fridges at 5°C or below to allow for fluctuations.
What temperature should frozen food be stored at?
Quick-frozen food should be kept at -18°C or colder, with brief rises to no warmer than -15°C allowed during transport.
Can I send chilled food through a standard parcel carrier?
Yes, as long as your packaging keeps the product at a safe temperature for the whole journey. Mail order food is exempt from the 8°C control, but it mustn't be supplied at a temperature that puts health at risk. Use validated insulated packaging and avoid weekend transit.
Does a 3PL need a license to store medicines?
A 3PL distributing medicines on your behalf will normally need a wholesale dealer's license from the MHRA and must follow Good Distribution Practice.
How many 3PLs offer cold storage?
Not many. According to our platform data, 5.9% of UK providers offer chilled storage and 2.0% offer frozen. In the US, it's 18.9% and 5.0%.
Find a 3PL with temperature-controlled storage
Cold chain logistics comes down to mapped and monitored storage, validated packaging, sensible dispatch days, and a provider who's handled products like yours before. The field is small, so start with a shortlist of 3PLs that already offer the temperature range you need.
Compare 3PLs with temperature-controlled storage on Fulfilment.com and get quotes from providers set up for chilled, frozen, and pharmaceutical products.
