Cold-chain transport checklist: choosing and auditing a reefer transporter

Our cold-chain shipping guide explains how to move temperature-sensitive goods step by step. This page is different. It is the buyer’s checklist: what to demand from a reefer transporter before you hire them, and how to check they deliver it.

It is written for shippers of frozen food, chilled food, dairy and ice cream.

1. Agree the temperature band for each product

Different products need different bands. As common industry practice:

• Ice cream and frozen desserts need the coldest, most stable band. Even a short warm spell can damage texture, and the damage does not reverse.
• Frozen food such as meat, fish and ready meals stays deep frozen for the whole trip.
• Chilled dairy such as milk, curd, paneer and cheese stays cold but must never freeze.
• Fresh produce varies a lot by item. Some items are hurt by too much cold.

Use our cold-chain temperature guide as a starting point, then follow your own product specification. Write the band into the contract, with the allowed tolerance and how long a reading may sit outside it.

Do not mix bands in one truck unless it has separate compartments built for that.

2. Pre-cool the truck before loading

A reefer is built to hold temperature, not to pull warm product down. So the box must be cold before the first pallet goes in.

Ask the carrier:

• How long they run the unit before loading, and how they prove it.
• Whether the pre-cool reading is logged with a time stamp.
• What happens if the truck reports to the dock warm.

Your dock team should check the box reading before loading starts. If it is not at band, the truck waits or is rejected. Loading a warm truck “to save time” is one of the most common causes of loss.

3. Continuous temperature logging

One reading at the gate tells you almost nothing. You need a log for the whole trip.

A good setup has:

• A sensor in the cargo box, not just the unit’s own display.
• Readings at a fixed, frequent interval from loading to unloading.
• Live data you can see during the trip, not only a file after it ends.
• An alert to the carrier and to you when a reading leaves the band.

What counts as a breach

Define it before the first trip:

• The band. The upper and lower limit for that product.
• The tolerance. How long a reading may sit outside the band, for example during a door opening, before it counts.
• Sensor dark. A gap in data is not “fine”. Treat a long gap as a breach until the carrier proves otherwise.

Agree who decides whether a load is accepted after a breach, and how fast the carrier must tell you.

4. What to ask a carrier for

Make these part of the contract, not a favour:

• A temperature log with every proof of delivery. The full trip, attached to the signed delivery note.
• Live tracking. Location and temperature on one screen, with the time of the last reading shown.
• Breach reports. What happened, when, for how long, and what the driver did.
• Vehicle details. Which trucks will run your lanes, and when each reefer unit was last serviced.
• A night contact. A named desk that answers when an alert fires at 2 am.
• Back-dated records. The ability to pull the log for any past trip when a depot raises a claim.

5. Dock and detention time at plant and depot

Temperature is only half the story. Time is the other half.

Track for every trip:

• Report to dock. When the truck arrived at the plant.
• Loading start and end. How long it sat at the dock.
• Gate out. When it actually left.
• Arrival and unloading at the depot. How long it waited before the doors opened.

Long waits at either end burn fuel, hold product at risk, and cut the trips each truck can make. Often the delay sits with the plant or depot, not the carrier. Measure it so you can fix the right side.

6. The audit checklist

Run this every month, and after any breach or new lane.

• Temperature band and tolerance written for every product and lane.
• Pre-cool reading logged before every loading.
• Warm trucks rejected or held, with a record.
• Full trip log attached to every proof of delivery.
• Live tracking working, with the last reading time visible.
• Every breach reported, with cause and action.
• Sensor data gaps explained.
• Reefer units serviced on schedule.
• Dock time and detention measured at plant and depot.
• Repeat delays raised with the side that caused them.
• Claims settled using the trip log, not memory.

If a carrier cannot show you most of this from their own records, they are not running a cold chain. They are running a truck with a cooler on it.

How Safe & Secure Logistics works

Safe & Secure Logistics has moved freight since 1951 and makes 2,300+ cold-chain hires a year. We run a live cold-chain control tower for a leading ice-cream maker, watching temperature, location and dock time for every truck. See our cold chain and reefer service, or send us your lanes for a quote.

Figures for Safe & Secure Logistics are for FY2025-26 from our booking register. How each one is counted is on the Facts and sources page.