If you ship temperature-controlled food freight, FSMA compliance is not just the carrier’s problem.
The FDA’s Food Safety Modernization Act, through the Sanitary Transportation of Human and Animal Food rule, assigns responsibilities across shippers, loaders, carriers, and receivers. In practice, that means the shipper, carrier, and other parties involved in the cold chain must be aligned on temperature requirements, equipment condition, sanitation expectations, documentation, and communication.
For shippers, the takeaway is simple: the carrier you choose becomes part of your compliance process.
Varstar Alliance helps shippers move temperature-controlled and food-grade freight across the U.S. and Canada through dedicated and vetted reefer capacity, disciplined carrier selection, documentation support, and cross-border coordination.
This guide covers what FSMA requires, the temperature ranges that matter, how to vet a reefer carrier, and how to plan compliant capacity in a tight 2026 market.
What is reefer freight?
Reefer freight refers to temperature-sensitive cargo moved in a trailer with a refrigeration unit designed to maintain a required temperature during transit.
Common reefer commodities include:
Fresh produce
Dairy
Meat and seafood
Frozen foods
Beverages
Food ingredients
Some non-food temperature-sensitive goods, such as pharmaceuticals
This guide focuses mainly on food freight because FSMA applies to the transportation of covered human and animal food. Pharmaceuticals and other temperature-sensitive products may have their own handling, documentation, and regulatory requirements.
Most refrigerated trailers can operate across a wide temperature range, from frozen to chilled settings. The exact set point should always be confirmed in writing before pickup based on the product, packaging, shelf-life requirements, and shipper instructions.
Typical reefer temperature ranges
These are general reference ranges. Always confirm the required set point for each shipment before loading.
Product type
Typical temperature range
Frozen foods
-10°F to -20°F
Meat / seafood
28°F to 32°F
Dairy
34°F to 38°F
Fresh produce
34°F to 40°F
Pharmaceuticals
Validated, product-specific
Temperature requirements are not one-size-fits-all. Some products are damaged by freezing. Others require narrow validated ranges. For food freight, the required operating temperature should be specified clearly before the carrier accepts the load.
What does FSMA require for temperature-controlled food freight?
The FSMA Sanitary Transportation Rule is designed to prevent food safety risks during transportation.
For temperature-controlled food freight, the rule focuses on four main areas:
1. Equipment design and maintenance
Vehicles and equipment must be suitable for the freight being transported.
That means trailers should be capable of maintaining the required temperature, should be cleanable, and should not create conditions that could contaminate the product.
2. Transportation operations
The freight must be transported in a way that protects it from food safety risks.
For reefer freight, this can include maintaining required temperature conditions, preventing cross-contamination, protecting food from prior cargo residue, and making sure loading and unloading practices do not compromise the product.
3. Training
Carrier personnel involved in covered food transportation must be trained in sanitary transportation practices when the carrier and shipper have agreed that the carrier is responsible for sanitary conditions during transport.
Training should be documented and available when needed.
4. Records
Written procedures, agreements, training records, and temperature-related documentation may be required depending on the role each party plays and what responsibilities were assigned.
For shippers, this is why documentation matters. If temperature control, trailer condition, or sanitation requirements are not clearly communicated, the risk increases for everyone in the chain.
Two practical FSMA points shippers should not miss
1. The shipper should specify temperature requirements in writing
For food that requires temperature control for safety, the shipper should clearly provide the required operating temperature to the carrier before pickup.
Do not rely on verbal instructions or assumptions. The set point should be documented.
2. Temperature verification should be part of the process
FSMA does not require one universal temperature-monitoring device or one specific logging method for every load. The shipper and carrier can agree on the monitoring method.
That said, many shippers require temperature logs, reefer download data, or temperature checks as a best practice.
The key is that the carrier should be able to demonstrate that the required temperature conditions were maintained when requested.
Pre-cooling: why it matters
Pre-cooling means bringing the trailer to the required temperature before loading.
This matters because a reefer unit is designed to maintain temperature, not quickly cool down warm product or overcome poor loading conditions. Loading temperature-sensitive freight into a warm trailer can push the product out of spec before the load even leaves the dock.
For temperature-controlled food freight, the pre-cool requirement should be confirmed before pickup and verified before loading.
Clean trailers and sanitation
Trailer cleanliness is not optional for food-grade freight.
A trailer that carried a prior load with residue, odor, moisture, pests, or contamination risk may be unsuitable for the next food shipment. Even if the reefer unit works properly, poor sanitation can still create a food safety issue.
Before booking reefer freight, shippers should confirm that the carrier has sanitation procedures and can provide documentation when needed.
How to vet a reefer carrier
Before you book temperature-controlled food freight, confirm that the carrier can support the requirements of the load.
A strong reefer carrier should be able to demonstrate:
Experience with temperature-sensitive freight
Equipment capable of maintaining the required set point
A clear pre-cooling process
Temperature monitoring or verification capability
Cleaning and sanitation procedures
Driver understanding of food-grade handling requirements
Documentation readiness
Communication process for exceptions
Insurance appropriate for the commodity and value
Cross-border experience, if the shipment moves between the U.S. and Canada
Carrier selection is a compliance decision, not just a price decision.
The lowest rate is not worth much if the trailer is not clean, the set point is wrong, the driver does not understand the product, or the carrier cannot document what happened in transit.
Reefer freight in a 2026 market
Two dynamics matter for shippers in 2026.
First, reefer capacity and rates are firming. Refrigerated freight is more exposed to seasonal volatility, especially during produce season, when demand for temperature-controlled trailers rises.
Second, food and beverage freight remains a major cargo theft target. According to Verisk CargoNet’s annual analysis, food and beverage products saw 708 thefts in 2025, a 47% increase from 2024.
For shippers, that means reefer planning is not only about temperature. It is also about chain of custody, carrier vetting, visibility, and risk control.
The takeaway is clear: do not wait until the last minute to find reefer capacity. Plan ahead with a provider that understands temperature-controlled freight, documentation expectations, and carrier discipline.
Cross-border cold chain: an added layer
If your reefer freight crosses the U.S.–Canada border, you add another layer of complexity.
You are not only managing temperature control. You are also managing customs documentation, PARS/PAPS coordination, broker communication, and border timing.
For perishables, border delays are especially costly. Every hour at the crossing can reduce shelf life and increase the risk of rejected product.
U.S.-bound covered food shipments may fall under FSMA sanitary transportation requirements. Canada-bound or Canadian shipments may also involve Canadian food safety requirements, including rules under the Safe Food for Canadians Regulations where applicable.
For cross-border cold chain, the right process matters:
Confirm customs documents before pickup
Coordinate with the customs broker early
Use border-experienced carriers
Confirm temperature requirements in writing
Verify pre-cool before loading
Monitor shipment status closely
Have a plan for delays or exceptions
Cross-border reefer is not the place for guesswork.
Why shippers choose Varstar for reefer freight
Varstar Alliance helps shippers move temperature-controlled and food-grade freight with a focus on planning, carrier discipline, and execution.
That includes:
Access to dedicated and vetted temperature-controlled capacity
Not last-minute spot coverage in a tight reefer market.
For recurring, high-value, seasonal, or cross-border reefer freight, we help shippers plan capacity ahead instead of waiting until the market is already tight.
Carrier discipline for food-grade freight
We focus on carrier selection, equipment fit, temperature-control requirements, sanitation expectations, and documentation readiness.
The goal is to reduce surprises before the freight reaches the dock.
Cross-border cold-chain coordination
Reefer freight crossing the U.S.–Canada border requires both temperature control and customs coordination.
That means documentation, timing, broker communication, and carriers that understand border execution.
Support aligned to U.S. business hours
Our nearshore support structure helps extend coverage for tracking, communication, carrier relations, and exception management.
For temperature-controlled freight, visibility matters. If something changes, you need to know early.
Lane planning based on real market conditions
Reefer capacity can shift quickly during produce season, holidays, weather disruptions, and demand spikes.
Planning ahead helps shippers reduce service risk, avoid last-minute pricing pressure, and secure better coverage for important lanes.
The bottom line
In temperature-controlled food freight, the carrier you choose is part of your compliance posture.
Clean equipment, clear temperature instructions, verified pre-cool, sanitation procedures, temperature documentation, and reliable communication all matter.
With reefer capacity firming in 2026 and food freight remaining a major theft target, shippers cannot afford to treat reefer like a normal dry van load.
The safest approach is simple:
Plan capacity early.
Vet carriers carefully.
Document temperature requirements.
Confirm sanitation and pre-cool.
Work with a provider that understands both cold chain and execution.
For shippers moving refrigerated, food-grade, or cross-border freight, access to dedicated and vetted temperature-controlled capacity can be the difference between a clean delivery and a costly rejected load.
Frequently Asked Questions
What temperature does a reefer trailer hold?
Most reefer trailers can maintain a wide temperature range, commonly from frozen settings around -20°F up to chilled settings near 65°F to 70°F. The exact set point depends on the product and should be confirmed in writing before pickup.
What does FSMA require for shipping food?
FSMA’s Sanitary Transportation Rule requires covered parties to use suitable equipment, protect food from contamination, maintain required temperature conditions when needed, train relevant personnel, and keep appropriate records.
Who is responsible for FSMA compliance: the shipper or the carrier?
Responsibilities can apply across shippers, loaders, carriers, and receivers. The shipper generally has primary responsibility for determining and communicating the transportation requirements unless responsibilities are assigned to another party through a written agreement.
Does FSMA apply to pharmaceuticals?
No. FSMA’s Sanitary Transportation Rule applies to covered human and animal food, not pharmaceuticals. Pharmaceutical shipments may have separate temperature-control and regulatory requirements.
What is pre-cooling and why does it matter?
Pre-cooling means bringing the trailer to the required temperature before loading. It matters because loading temperature-sensitive freight into a warm trailer can push the product out of spec and increase the risk of spoilage or rejection.
Does FSMA require continuous temperature logging?
Not in one universal way for every shipment. FSMA allows flexibility in how temperature is monitored and demonstrated. However, many shippers require temperature logs, reefer download data, or other documentation as a best practice.
Does Varstar offer refrigerated LTL?
Varstar can help evaluate temperature-controlled options based on your shipment size, pallet count, temperature requirements, lane, and timing. Some reefer freight may move as truckload, while some shipments may be better suited for LTL or consolidated solutions depending on the requirements.
Why is food and beverage freight a higher theft risk?
Food and beverage freight is widely targeted because it is easy to resell and often moves through predictable lanes. CargoNet reported that food and beverage thefts increased sharply in 2025, making carrier vetting and chain-of-custody especially important for reefer loads.
What documentation should a reefer carrier be able to provide?
A reefer carrier should be able to support the shipment with written procedures, training records where applicable, sanitation or cleaning documentation, temperature verification, reefer data when required, and clear communication around pickup, transit, and delivery.
Why does dedicated and vetted temperature-controlled capacity matter?
When the reefer market tightens, last-minute spot coverage can become expensive and unreliable. Dedicated and vetted capacity gives shippers better visibility, stronger carrier accountability, and more control over temperature-sensitive freight.