Refrigerated Trucking: A Shipper's Guide to Reefer Transportation

Refrigerated trucking is the backbone of the American food supply chain, moving everything from frozen beef and fresh seafood to dairy products and pharmaceuticals across the country every day. For shippers who depend on temperature-controlled transportation, understanding how reefer trucking works, what the equipment can and cannot do, and how to select the right carrier partners is essential for protecting product quality and managing costs.

Reefer Trailer Types and Capabilities

The standard reefer trailer is 53 feet long with a refrigeration unit mounted on the front wall. These units can cool the interior to as low as negative 20 degrees Fahrenheit and heat it to as high as 70 degrees Fahrenheit, making them versatile for frozen, chilled, and warm-protect loads. The typical capacity is 22 to 26 pallets and 42,000 to 45,000 pounds depending on the trailer weight and commodity density. Multi-temperature trailers use moveable insulated bulkheads to create separate temperature zones within the same trailer, allowing frozen and chilled products to ship together on a single truck.

Temperature Control Technology

Modern reefer units use microprocessor controls that maintain temperature within plus or minus 2 degrees of the set point. The unit cycles between cooling and defrost modes automatically to prevent ice buildup on the evaporator coils, which can temporarily raise the air temperature inside the trailer. This is normal operation and does not affect product temperature as long as the unit is functioning properly. GPS-enabled telematics systems on most newer trailers provide real-time temperature monitoring and alerts, allowing both the carrier and the shipper to track conditions throughout transit.

Continuous Temperature vs. Cycle-Sentry Mode

Reefer units can operate in continuous mode, where the engine runs constantly, or cycle-sentry mode, where the engine cycles on and off based on temperature readings. Continuous mode provides the tightest temperature control and is required for frozen loads and highly perishable products. Cycle-sentry mode saves fuel and reduces engine wear but allows wider temperature swings between cycles. Always specify which mode your product requires when booking a load, and verify the setting at pickup before the driver departs.

How to Select Reefer Carriers

Carrier selection for refrigerated freight should go beyond rate comparison. Key evaluation criteria include the age and condition of the carrier's reefer fleet, their maintenance program for refrigeration units, driver training on temperature protocols, their claims history for temperature-related damage, whether they use continuous temperature monitoring, and their FSMA compliance documentation. ArrowLane vets every carrier in our network against these criteria and maintains current qualification records, so you do not have to perform this due diligence yourself.

Seasonal Capacity Planning

Reefer capacity tightens significantly during produce season from April through August and again during the holiday shipping surge from October through December. During these periods, rates increase and truck availability decreases, especially on outbound lanes from major produce regions. Smart shippers plan their capacity needs 30 to 60 days in advance during peak seasons and lock in rates on their most critical lanes before the market tightens. ArrowLane's rate lock program guarantees capacity and pricing year-round, eliminating the scramble for trucks during the busiest shipping periods.