Reefer Drayage: Moving Temperature-Controlled Containers Without Breaking the Cold Chain

Dry containers can sit for a day and barely change inside. Reefer containers can't. The moment a refrigerated box loses power, the clock starts running on product loss — produce ripens too fast, pharmaceuticals drift out of their required range, meat and seafood spoil. That makes drayage, the short truck move between the port or rail ramp and its final destination, one of the riskiest legs in the entire cold chain.

It's also one of the most overlooked. Ocean carriers monitor reefers closely at sea, and warehouses run their own temperature programs on the receiving end, but the hour or two a container spends on a chassis behind a drayage truck often gets the least scrutiny — even though that's exactly when the container loses its connection to shore power or yard power and starts running on its own generator. Here's what actually separates a reefer move from a standard drayage haul, and what to check before you hand off a temperature-controlled load.

A dry van container just needs to arrive intact. A reefer container needs to arrive at the exact temperature it left at, sometimes within a degree or two, for the whole trip. That means the refrigeration unit itself, not just the truck pulling it, has to keep running the entire time it's on the road.

On the vessel and in the rail yard, reefers plug into shore power or yard power so their refrigeration units can run continuously without interruption. Once a container comes off the ship or railcar and onto a chassis for the road move, that outside power source disappears. From that point until the box reaches a plug at the warehouse or distribution center, the reefer unit runs on a generator set, or genset, mounted to the chassis or trailer pulling it.

Most temperature excursions during drayage trace back to a handful of predictable points, and knowing them helps you ask the right questions before booking a move.

• Gate delays: a container sitting in a terminal queue on genset power for hours adds fuel burn and wear to the unit, on top of the delay itself.
• Power gaps: any stretch where the container isn't plugged into shore or yard power and isn't running its genset is time the load isn't being actively cooled or heated.
• Genset fuel: a generator that runs dry mid-move stops refrigerating the load even if the truck keeps rolling.
• Pre-trip shortcuts: a reefer that wasn't confirmed at setpoint before dispatch starts the trip already out of range.

A pre-trip inspection should happen before the truck ever leaves the terminal, not after. That means confirming the unit is actually holding its setpoint, checking fuel level in the genset, and verifying that the temperature recorder or data logger is running and capturing readings. A reefer that wasn't properly pre-cooled or verified before dispatch starts the trip already out of range, and there's no making that time back once cargo is in transit.

Monitoring shouldn't stop once the truck starts moving. Modern reefer units broadcast temperature data throughout a trip, and pairing that with GPS tracking gives a shipper real visibility into both where the container is and what's happening inside it. Avtar Freightways runs a GPS-tracked, ELD-equipped fleet, which gives dispatch and customers a live picture of every move, reefer loads included — you can check a container's status through tracking rather than wait for a delivery call to find out how the trip went.

Not every chassis in a pool is reefer-ready. A reefer move needs a chassis with a working genset mount, and in most cases a diesel-fueled generator that's already installed and fueled — you can't just drop a refrigerated box onto whatever dry chassis happens to be available. If your freight is moving through the Port of Oakland or a Northern California rail ramp, the drayage provider needs equipment already matched to reefer requirements rather than scrambling to find compatible gear once the container is already on the ground. For background on how chassis pools work more generally, see container chassis 101.

Equipment is only half of it. A driver moving a reefer box needs to know how to read the unit's control panel, confirm it's actually running and not just powered on, and recognize an alarm code before it turns into a spoiled load. That's a different skill set than hooking a chassis and pulling a standard dry container, and it's worth asking about directly when you're comparing carriers.

Reefer capability isn't something you can verify from a rate sheet. It comes down to specific questions about equipment, process, and access.

• Do your drivers perform and document a pre-trip temperature check before leaving the terminal?
• How do you handle genset refueling on longer moves or when a container dwells at the yard?
• Can dispatch tell me the container's location and temperature while it's in transit, not just after delivery?
• What's your process if a reefer unit alarms or drifts out of range mid-move?
• Are your drivers TWIC-credentialed so port access itself isn't a delay?

Container access adds one more layer that dry freight doesn't have to deal with. Reefer cargo is frequently time- and temperature-sensitive enough that delays at the marine terminal gate carry real cost, which is why driver credentials matter. Drivers need a TWIC card to access secure port areas at all, and dispatch availability matters just as much — a reefer sitting in a queue at 9 p.m. needs a carrier that can respond then, not the next morning. Round-the-clock dispatch is standard for exactly this reason.

Booking a reefer move right starts well before the truck shows up. Get the setpoint and any product-specific handling notes nailed down early, confirm the chassis and genset setup in advance, and build in a realistic pickup window rather than an exact-minute promise, since terminal conditions vary hour to hour. For a broader pre-booking checklist that applies to any drayage move, reefer or dry, see the drayage quote checklist, and when you're ready to compare carriers on more than price, our guide on how to vet a drayage carrier covers the questions worth asking beyond reefer capability specifically.

1. 01Confirm the exact temperature setpoint and any product-specific handling notes before you book.
2. 02Ask what chassis and genset setup the carrier will use, and confirm it's matched to your container.
3. 03Build in a realistic pickup window rather than an exact-minute promise — terminal conditions shift by the hour.
4. 04Request delivery confirmation that includes recorded temperature data, not just a signed receipt.