What Is Refrigerated Shipping?
Refrigerated shipping moves cargo that needs to stay cool but must not freeze. Inside a reefer trailer or container, temperatures run between 0°C and 10°C depending on the product. The unit controls airflow and insulation to hold that range consistently across the full transit window.
Typical refrigerated cargo categories include:
- Fresh produce including berries, lettuce, and stone fruit
- Chilled meat and fresh seafood heading to retail or food service
- Bottled juices, cold-pressed beverages, and perishable drinks
- Live cultures, probiotics, and temperature-sensitive health products
- Vaccines, insulin, and biologics with cool chain requirements
- Floriculture products including fresh-cut flowers and nursery stock
The refrigerated method is designed to preserve freshness, not to freeze. A crate of blueberries moving from a Nova Scotia farm to a Toronto distributor needs controlled cool air to arrive in marketable condition. Freezing them destroys the texture and makes them unsellable as fresh product. Explore our international freight forwarding expertise for perishable goods.
What Is Frozen Shipping?
Frozen shipping holds cargo at sub-zero temperatures throughout transit. Standard frozen freight runs between minus 18°C and minus 25°C. Certain cargo categories such as deep-sea fish, biological samples, and temperature-sensitive pharmaceutical compounds require environments as low as minus 40°C or colder.
Common frozen cargo categories include:
- Processed and raw protein including beef, chicken, and fish portions
- Frozen bakery items and ready-to-eat meals for retail
- Dessert products including sorbet, gelato, and ice cream
- Cryopreserved biological material and clinical research samples
- Pharmaceutical compounds requiring ultra-cold storage
Frozen shipping is not a colder version of refrigerated shipping. The two services use different equipment, require different pre-loading procedures, and come with entirely different handling responsibilities. A product that arrives partially thawed from a frozen shipment is almost never recoverable for sale. Visit fnrlogistics.ca to discuss your specific cold chain requirements.
Frozen vs Refrigerated Shipping: Direct Comparison
| Factor | Refrigerated Shipping | Frozen Shipping |
|---|---|---|
| Operating temperature | 0°C to 10°C | Minus 18°C to minus 25°C or lower |
| Product condition | Fresh, never frozen | Solidly frozen at all times |
| Equipment | Standard reefer unit | Deep freeze or cryogenic unit |
| Temperature tolerance | Moderate swing allowed | Near-zero tolerance |
| Cost per pallet | Lower | 20 to 40 percent higher |
| Transit flexibility | Moderate | Strict, minimal margin |
| Load-loss risk | Recoverable in some cases | Usually total loss |
| Typical cargo | Fresh food, beverages, pharma | Frozen food, biologics, specimens |
Frozen vs Refrigerated Freight: Key Differences That Matter
How Tightly Temperature Must Be Controlled
Both methods require temperature monitoring, but the consequences of variation are very different.
A refrigerated trailer carrying chilled produce can drift a couple of degrees during a door opening at a cross-dock without causing immediate product damage. The cargo has a buffer because it is not at a critical threshold.
Frozen cargo operates at a threshold where any upward movement matters. When a frozen prawn shipment warms from minus 20°C to minus 10°C during transit, ice crystal structure begins to break down. That physical change cannot be reversed. Refreezing the product does not restore it to its original state, and food safety inspectors at destination will reject a load showing thaw evidence.
Equipment Differences
A standard reefer unit runs on diesel-powered refrigeration that circulates chilled air through the cargo hold. These units are built into trailers and containers and are available from most cold chain carriers across Canada and cross-border lanes. They cool cargo, they do not freeze it.
Deep freeze units require compressor systems capable of reaching and maintaining sub-zero ranges under continuous load. For life sciences and pharmaceutical logistics, cryogenic units use liquid nitrogen or dry ice to sustain temperatures that mechanical refrigeration cannot reach.
The infrastructure at each end of the journey must also match. A frozen shipment arriving at a warehouse cross-dock without minus 20°C storage is in immediate jeopardy the moment it leaves the carrier.
Loading Procedures
Refrigerated cargo can be brought to temperature after it enters the container. Loading it at ambient conditions and then closing the unit to cool is common practice on shorter lanes, particularly for produce with some natural respiration.
Frozen cargo operates under a different rule. The product must be fully frozen before it arrives at the loading dock. The container must reach operating temperature before loading begins. Doors open only long enough to bring pallets in, then close immediately. Any gap in this sequence, even a brief delay at a busy dock in summer, can create temperature variation that shows up as product damage on delivery.
Why Transit Time Affects the Two Methods Differently
For refrigerated cargo, time is primarily a freshness issue. A well-maintained reefer can hold fresh produce in good condition across a four-day cross-country haul if loading was done correctly.
For frozen cargo, the risk is not transit time itself but the opportunities for error that a longer journey creates. Every loading event, every cross-dock transfer, and every customs examination is a moment where the cold chain can break. More distance means more of those moments. This is why choosing a reliable international freight forwarder is critical for sub-zero goods.
Cost Differences Between the Two Methods
Frozen freight costs more to move at every point in the chain:
- Deep freeze equipment requires more energy to operate continuously at lower temperatures
- Carriers with minus 20°C capability are fewer, which limits competition on rates
- Loading procedures take longer due to pre-cooling requirements and door protocols
- Cold storage at origin, transit facility, and destination must all meet frozen specifications
- Cargo insurance reflects the near-total-loss risk profile of frozen shipments
On most North American lanes, the per-pallet cost of frozen freight runs 20 to 40 percent above a comparable refrigerated shipment. That gap widens further on remote routes where deep freeze carriers are scarce. For an itemized breakdown, contact the FNR Logistics team today.
Which Is Better: Frozen or Refrigerated Shipping?
The answer has nothing to do with preference. It comes down entirely to what the product needs.
Fresh cargo that must arrive in its natural condition belongs in a refrigerated unit. Putting fresh product in a frozen container causes ice crystal formation, cell wall damage, and texture breakdown. The product arrives technically intact but commercially worthless.
Cargo that is already frozen, or that must remain frozen to be safe at destination, cannot travel in a refrigerated unit. The temperature range is simply not cold enough to maintain a frozen state across any meaningful transit window.
The question to ask is not which method is better. The question is what temperature range does this specific product require from origin to final delivery.
Cold Chain Shipping in Canada: What Changes
Canadian geography creates cold chain conditions that do not exist on most other trade lanes.
In January, a reefer trailer crossing Saskatchewan faces ambient temperatures of minus 35°C or colder. That unit is not cooling the cargo, it is heating it. In August, the same trailer on a southern Ontario dock faces radiant heat that can drop internal temperature during a single door opening. These seasonal extremes affect both frozen and refrigerated freight, but frozen cargo has far less margin to absorb them.
CFIA standards govern how temperature-controlled food products move into and within Canada. Documentation must match the physical condition of the cargo at inspection. A frozen shipment showing any sign of thaw at a CBSA examination point can be detained or rejected even if the temperature logger data looks clean. Working with a logistics partner who builds CFIA compliance into every cold chain booking prevents those outcomes.
Booking Errors That Cost Shippers
A shipper entering 2°C instead of minus 20°C will receive a standard reefer. The carrier sets the unit to what the booking says. The error shows up as product damage on delivery.
Standard refrigerated and frozen carriers are not the same. Many reefer fleets cannot sustain minus 20°C under continuous load. Confirm deep freeze capability with the carrier before tendering.
A frozen container loaded before it reaches operating temperature will show variance in cargo near the walls and doors. That shows up as quality issues at destination.
A good main haul means nothing if the shipment sits at a cross-dock that cannot hold minus 18°C. Every stop on the route needs to be verified.
How to Pick the Right Method
Three questions resolve the frozen vs refrigerated decision on virtually every shipment:
If the product needs to stay cold and fresh, book refrigerated. If it needs to stay frozen, book frozen, verify the carrier's equipment capability, and confirm cold storage at every stop along the route.
Common Questions
Frozen vs Refrigerated ShippingOne keeps cargo cold. The other keeps it frozen. Refrigerated units hold temperatures between 0°C and 10°C for fresh, never-frozen goods. Frozen units run at minus 18°C or lower and must maintain that range without interruption. Different equipment, different protocols, different cost. Learn more about ocean freight.
Deep freeze equipment uses more energy, is available from fewer carriers, requires stricter loading procedures, and demands minus-rated cold storage at every point in the chain. All of that adds cost relative to standard refrigerated freight.
In most cases, no. Standard reefer units cool but do not freeze. A unit rated to minus 20°C under continuous load is a different piece of equipment. Always confirm the carrier's equipment rating before booking frozen freight.
CFIA requires that temperature-sensitive food products arrive in the condition declared in the import documentation. Any sign of thaw or temperature deviation at a CBSA inspection point can result in detention or rejection at the border.
Document the condition with photos and temperature logger data immediately. Notify the carrier and your freight forwarder. Do not attempt to refreeze or sell food product without written guidance from the relevant food safety authority.