Most freight brokers think of reefer freight as produce: strawberries in summer, citrus in winter, and the occasional frozen meat load. That's the tip of the cold chain. The broader temperature-sensitive freight market spans pharmaceutical distribution, specialty chemicals, food manufacturing supply chains, and industrial materials — and it pays significantly better than dry van precisely because the shipper requirements are more demanding.
The Cold Chain Landscape Beyond Produce
Pharmaceutical freight is the highest-stakes cold chain category. Drug products, biologics, vaccines, and clinical trial materials all have strict temperature requirements set by FDA and international regulatory bodies. The two most common ranges are 2-8°C (refrigerated) for drugs and vaccines that can't freeze, and -20°C (frozen) for biologics and certain specialty medications. Pharmaceutical shippers do not compromise on documentation — a temperature excursion on a pharmaceutical load can mean product destruction and a significant insurance claim.
Industrial and specialty chemicals often have temperature stability requirements that aren't intuitively obvious. Many adhesives, resins, and epoxies gel or separate when they get too cold. Certain reactive chemicals degrade in heat. Controlled room temperature (15-25°C) freight — no active refrigeration, but the trailer must stay within range — is a category that falls between standard dry van and full reefer.
Food manufacturing ingredients are a large category: dairy components, liquid eggs, juice concentrates, flavoring compounds, and specialty fats. These often move in tankers or temperature-controlled dry freight and require strict documentation for food safety compliance.
Candles, waxes, and cosmetic products are easily overlooked. Summer heat ruins these products in an unrefrigerated trailer. Some cosmetic formulations have specific high-temperature limits that make climate-controlled transit necessary in warm months or in hot-weather lanes.
Beverages are mixed. Most beer and spirits move dry, but craft beverages, cold-brew concentrates, and certain wine shipments have temperature sensitivity.
Temperature Ranges and What They Mean for Equipment
| Range | Name | What It Covers | Equipment Required |
|---|---|---|---|
| 15-25°C | Controlled Room Temp | Many pharma, adhesives, cosmetics | Climate-controlled trailer or insulated dry van |
| 2-8°C | Refrigerated | Dairy, pharma drugs, vaccines | Full reefer running continuously |
| -18°C to -20°C | Frozen | Frozen food, biologics | Deep-freeze reefer, capable unit |
| Below -40°C | Ultra-cold | Specialty pharmaceuticals, research | Specialty equipment only |
The distinction between refrigerated and frozen matters operationally. A reefer trailer can typically run from around -20°C to +25°C. Ultra-cold requirements below -40°C need dedicated specialty equipment — these are rare freight moves but exist for certain pharmaceutical and research shipments.
Pre-Conditioning: Why It Matters
Pre-conditioning (also called pre-cooling or pre-heating) means running the trailer refrigeration unit to the target temperature before loading begins. Loading a warm product into a trailer that hasn't reached temperature creates a recovery problem — the unit has to work harder, and the product may spend time outside acceptable range during loading.
Pharmaceutical shippers and quality-focused food manufacturers frequently require pre-conditioning documentation as part of the load tender. Your carrier needs to understand this requirement and execute it. A carrier who shows up with a warm trailer to a pharma shipper will get turned away.
Temperature Monitoring and Documentation
Continuous temperature data loggers are standard on pharmaceutical and high-value cold chain freight. These are small electronic devices placed with the shipment that record temperature at regular intervals throughout the move. At delivery, the shipper or consignee downloads the data to verify the shipment stayed within range for the entire transit.
Some shippers supply their own loggers; others require the carrier to provide them. Know which your shipper expects before the load moves.
Periodic sampling — checking temp at pickup and delivery only — is common for produce and some food products but is not acceptable for pharmaceutical freight. Pharmaceutical cold chain requires continuous monitoring.
Documentation requirements vary by shipper, but expect to provide: bill of lading with temperature instructions, logger data at delivery, and a temperature excursion report if any deviation occurred.
Excursion Protocols
A temperature excursion is any period where the shipment goes outside its required range. On pharmaceutical freight, the protocol is defined by the shipper or product manufacturer — it is not a freight broker decision.
When an excursion occurs:
- The carrier must document when it occurred and for how long
- The shipper or consignee determines whether the product is still usable through a qualification study or excursion assessment — a documented process defined in their quality system
- Depending on the outcome, the product may be released anyway, quarantined pending further testing, or destroyed
Cargo insurance and shipper-specific requirements determine what happens with liability. The broker's job is to ensure the carrier documents the excursion fully and immediately notifies the shipper.
Cold Chain Rate Economics
Reefer lanes pay a 15-30% premium over equivalent dry van lanes. The reasons are straightforward: equipment is more expensive to purchase and maintain, fuel costs are higher (running a refrigeration unit burns additional diesel), and driver pool is smaller relative to demand.
For brokers, this means better gross margin potential per load — but also higher stakes. Cargo claims on cold chain freight are more common and more expensive than dry van. Your carrier qualification process needs to be tighter.
Building a Cold Chain Carrier Pool
When qualifying reefer carriers, verify beyond the basics:
- Equipment age and condition — refrigeration units wear out and fail; a carrier with a 10-year-old reefer with no maintenance records is a liability risk
- Temperature monitoring capability — do they have data loggers or is that the shipper's responsibility?
- Pre-conditioning compliance — can they demonstrate they understand and will follow temp-down-before-load procedures?
- Continuous vs. cycle-sentry operation — some reefer units run continuous (always on) or cycle-sentry (cycles on and off). Pharmaceutical freight often requires continuous operation; confirm the driver knows which mode to use
Frequently Asked Questions
What's the difference between refrigerated and frozen freight?
Refrigerated freight requires temperatures roughly between 0°C and 8°C — cold but above freezing. Frozen freight must be maintained at -18°C to -20°C. The same reefer trailer can typically handle both ranges, but the equipment must be capable of sustained low temperatures for frozen freight. Some pharmaceutical products, like certain vaccines, are refrigerated and will be destroyed if they freeze — making the lower end of the range as critical as the upper end.
What documentation does cold chain freight require?
At minimum: bill of lading with temperature instructions, continuous temperature logger data from pickup to delivery, and any shipper-required pre-conditioning records. Pharmaceutical freight often requires chain of custody documentation, excursion reports if any deviation occurred, and carrier qualification records. Food manufacturing ingredients may require FSMA (Food Safety Modernization Act) sanitary transportation compliance documentation.
How much more does reefer freight pay vs. dry van?
Reefer lanes typically pay 15-30% more than equivalent dry van lanes. The premium is driven by higher carrier costs (equipment, fuel, maintenance) and reduced carrier supply relative to demand. Pharmaceutical cold chain — which adds documentation and compliance requirements — can command even higher premiums from shippers who value execution reliability over price.
What happens if there's a temperature excursion on my load?
The carrier must document the excursion — when it started, how long it lasted, and the temperature deviation. The shipper or product owner then determines disposition through their quality system: the product may be cleared for use, quarantined for additional testing, or destroyed. The freight broker should immediately notify the shipper and ensure the carrier provides full documentation. Cargo insurance coverage and shipper claims procedures handle the financial side.
Can a carrier switch between dry and reefer freight?
Yes — reefer trailers can carry dry freight when the refrigeration unit is off (this is called running "nose up"). Many carriers use their reefer fleet for both. From a compliance standpoint, sanitary transportation regulations require that trailers used for food-grade reefer freight must be clean and free of prior cargo contamination. Some pharmaceutical shippers require dedicated reefer trailers or recent sanitary cleaning documentation before loading.