Reefer Temperature Excursions: Response & Claims Guide

A reefer download shows 34°F for six hours on a load set at 55°F — now what? Temperature excursions are where cold chain programs earn or lose their money. Whether the cargo is produce from PortMiami, pharma out of a GDP depot, or frozen seafood heading up I-95, what you do in the first hours after discovering an excursion decides whether the loss is recoverable. This guide covers why excursions happen, how to respond, and how claims actually resolve in 2026.

What counts as a temperature excursion

An excursion is any period where product temperature moves outside its specified range. Three details matter more than shippers expect:

• Air temp vs product temp: reefer units record return-air and supply-air temperature, not the temperature inside a pallet. Brief air-temp spikes during door openings or defrost cycles often never reach the product.
• Duration: most commodities tolerate short deviations; stability data or shelf-life science defines how much.
• Set point vs range: a load set at 36°F with an acceptable range of 33–41°F is not in excursion at 38°F.

Why excursions happen

The usual suspects, roughly in order of frequency: warm loading (product not pre-cooled before the trailer arrives), wrong set point or mode (continuous vs cycle-sentry), airflow blocked by tight pallet patterns or bulkhead problems, long door-open periods at multi-stop deliveries, equipment failure or low fuel, and delays that stretch a marginal situation into a loss. Note that a reefer unit is designed to maintain temperature, not to cool warm product — loading warm is the classic shipper-side error, and it shows up in the data as a unit running flat-out from minute one. Proper refrigerated trucking practice pairs pre-trip inspection with pulp-temperature checks at loading.

The first 24 hours after discovery

1. Do not refuse the load outright — note the excursion on the delivery receipt, photograph the download and product, and accept under protest where appropriate. An undocumented rejection weakens everyone’s position.
2. Preserve the evidence: reefer download, data logger files, pulp temps at delivery, photos, and the bill of lading with the temperature instruction.
3. Quarantine and mitigate: move product into temperature-controlled storage while its condition is assessed. The law expects the claimant to mitigate damages; dumping product without inspection invites denial.
4. Notify the carrier in writing immediately, and file the formal claim within the contractual window (nine months is the standard Carmack deadline for motor claims).

How liability actually sorts out

Under the Carmack Amendment, a shipper establishes a prima facie case by showing goods were tendered in good condition, arrived damaged, and the loss amount. The carrier then argues defenses — most commonly that the product was loaded warm, that the BOL lacked a temperature instruction, or that the shipper’s packaging blocked airflow. This is why the boring paperwork wins claims: pulp temps at origin, a set point on the BOL, and a clean pre-trip record. Loads moving under a broker add a layer; loads on an asset carrier keep accountability in one place.

Preventing the next one

Continuous telematics with alerts beats discovering an excursion at delivery; geofenced alarms let a dispatcher fix a wrong set point in the first hour. Standardize temperature instructions on every BOL, audit pallet patterns for airflow, and pre-stage product so trailers load cold and fast. Go Freight’s fleet runs live GPS and temperature monitoring through its TMS, so customers see set point and status in real time instead of after the fact. Get a reefer quote with monitoring included.

Frequently asked questions

Who is liable for a temperature excursion?

It depends on cause. Carriers are generally liable for equipment failure, wrong set point, or negligence in transit; shippers bear losses from warm loading, missing temperature instructions, or packaging that blocks airflow. The reefer download usually tells the story.

Does a temperature excursion automatically mean the product is a loss?

No. Brief air-temperature deviations often never affect product temperature. Condition should be assessed against commodity stability data before product is destroyed.

How long do I have to file a reefer claim?

File written notice as soon as possible; the standard contractual deadline for motor cargo claims is nine months from delivery, with suit periods defined in the carrier’s terms.