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Refrigerated Trucking: A Shipper's Guide to Cold Chain Freight
Dry freight forgives mistakes. Cold freight does not. A reefer unit set two degrees wrong, a trailer pre-cooled late, or product loaded warm can turn a full truckload into a total loss before it crosses the state line. Here is what shippers need to know to move temperature-sensitive freight with confidence.
What Refrigerated (Reefer) Trucking Is
A refrigerated trailer is an insulated box with a diesel-powered refrigeration unit mounted on the nose. The unit does not chill warm product; it holds product at the temperature it was loaded at. That distinction drives almost every rule in cold chain shipping: the cold chain starts at your dock, not in the trailer.
Common Temperature Ranges by Product
| Product | Typical set point |
|---|---|
| Frozen foods, ice cream | 0 F or below (ice cream often -10 F) |
| Fresh meat, poultry, dairy | 34 to 38 F |
| Most fresh produce | 34 to 55 F, commodity specific |
| Chocolate, confectionery | 55 to 65 F |
| Pharmaceuticals (cold chain) | 36 to 46 F, tightly controlled |
| Beverages, protect from freeze | 36 to 45 F |
Always confirm the exact spec with your QA team or manufacturer. "Keep refrigerated" is not a set point.
Continuous vs Cycle Operation
Reefer units run in two modes. Continuous keeps the unit running nonstop for a tight, steady temperature. Fresh produce, meat, dairy and pharma should always ship continuous. Cycle (start-stop) switches the unit on and off to save fuel, letting the box temperature drift a few degrees between cycles. That is acceptable for solidly frozen goods and little else. Put the required mode on the rate confirmation and the bill of lading so there is no ambiguity.
What a Good Reefer Carrier Does
- Pre-cools the trailer to your set point before backing into the dock
- Verifies pulp temperature of the product at loading and notes it on the BOL
- Runs continuous mode when the freight requires it, without being asked twice
- Monitors remotely and reacts to alarms in transit, not at delivery
- Provides the reefer download (the unit's temperature log) on request
- Maintains the unit with documented service intervals so it does not fail on a July afternoon
What Reefer Service Costs
Expect 15 to 25 percent above dry van on the same lane, more during produce season when reefer capacity tightens nationwide. The premium covers the trailer itself, unit fuel burn, maintenance, and the higher stakes of the freight. Trying to save that premium by shipping cold product in a dry van with blankets is how total-loss claims happen.
Protecting Yourself as the Shipper
- Load cold. The reefer holds temperature; it does not pull product down. Pre-cool your freight.
- Write the set point and mode on the BOL. If it is not in writing, it did not happen.
- Record pulp temps at loading and have the driver acknowledge them.
- Ask for the reefer download whenever a receiver questions temperature.
- For pharma and high-value loads, add an independent data logger inside the freight.
FAQ
How much more does refrigerated trucking cost than dry van?
Plan on roughly 15 to 25 percent above dry van rates on the same lane. Reefer trailers cost more to buy and maintain, burn extra fuel running the unit, and are in high demand during produce seasons.
What is continuous vs cycle operation?
Continuous mode runs the refrigeration unit nonstop for a steady temperature, which sensitive loads like pharma and fresh produce need. Cycle mode turns the unit on and off to save fuel, allowing wider temperature swings that are fine for frozen goods.
Do I need temperature monitoring on my shipment?
For anything perishable or regulated, yes. Modern reefer units log temperature continuously and good carriers provide download reports on request. For high-value pharma loads, add an independent data logger in the freight itself.
What temperature should my product ship at?
Common set points: frozen foods at 0 F or below, fresh meat and dairy at 34 to 38 F, most produce at 34 to 55 F depending on the commodity, and chocolate at 55 to 65 F. Always confirm the spec with your product's manufacturer or QA team.
Who is liable if my refrigerated freight spoils in transit?
If the carrier failed to run the unit at the agreed set point, their cargo insurance responds; the reefer download is the key evidence. If the freight was loaded warm or packaged wrong, liability can shift to the shipper. Pre-cool the product, note pulp temps on the BOL, and photograph the load.