Cross-Border Freight Between Canada, the U.S. and Mexico

1What changes at the border

A domestic load is an agreement between three parties: the shipper, the carrier and the consignee. A cross-border load adds two governments and, in practice, a customs broker on each side, and every one of them runs a clock. The truck can be on time and the freight can still sit, because the physical move is the easy part. The release is the hard part.

Freight is held until the importing country’s customs authority releases it. Into Canada that is the Canada Border Services Agency (CBSA); into the United States it is U.S. Customs and Border Protection (CBP); into Mexico it is the tax authority’s customs arm (SAT/Aduanas). Most border delays are paperwork delays, not driving delays. That is the single most useful thing to know before you tender your first cross-border shipment.

Three things have to line up before the truck reaches the booth: the importer of record has to be registered and in good standing, the customs broker has to have filed an entry, and the carrier’s electronic manifest has to match that entry. When all three agree, the driver is waved through in minutes. When one is missing, the driver waits, or gets turned around.

Carrier eManifest, highway

1 hour before arrival (Canada ACI and U.S. ACE)

FAST-approved shipments into the U.S.

30 minutes

Carrier eManifest, rail

2 hours before arrival into Canada

Marine cargo data

24 hours before loading (both countries)

FDA prior notice for food into the U.S.

2 hours by road, 4 by rail, 8 by water

CARM registration for importers into Canada

Mandatory since January 1, 2026

2The documents, and who produces each

Every cross-border shipment moves on a small set of documents. The mistakes that cause holds are almost never exotic; they are a value that does not match, a missing tariff classification, or an origin statement nobody prepared. Knowing who owns each document is half the battle.

One rule prevents most problems: the invoice is the source of truth, and it should be complete and with the customs broker at pickup, not when the truck is an hour from the border.

3PARS and PAPS, explained plainly

PARS (Pre-Arrival Review System) is Canada’s pre-clearance process. PAPS (Pre-Arrival Processing System) is the U.S. equivalent. They work the same way, in opposite directions.

• The carrier assigns a unique barcode number to the shipment, from its own PARS or PAPS label stock, and writes it on the paperwork.
• The shipper or carrier sends the documents and that number to the customs broker.
• The broker files the entry with CBSA or CBP under that number, before the truck arrives.
• The carrier files its eManifest carrying the same number.
• Customs reviews the entry ahead of time. When the driver reaches the booth, the officer scans the barcode and the release decision is already made.

When it fails, it fails the same way every time: the number on the truck’s manifest does not match a filed entry. Either the broker never received the paperwork, received it late, or filed under a different number. The driver is told the PARS or PAPS is “not set up” and waits at the crossing, or is sent to a bonded warehouse to clear from there. Every hour of that is on the clock for a reefer.

4eManifest timing: ACI, ACE and the clocks that trip people up

Both countries require the carrier to transmit shipment data electronically before the truck arrives. Canada calls it ACI eManifest; the U.S. calls it ACE. The deadlines are firm, and they interact with the broker’s entry and, for food, with the FDA.

The importer’s own clock: CARM

Since January 1, 2026, commercial importers into Canada must be registered in CBSA’s CARM Client Portal with a business number. To have goods released before duties and taxes are paid, the importer also has to be enrolled in Release Prior to Payment and post its own financial security. An importer that is not registered, or has no security on file, will see release delays regardless of how good the paperwork is. If you import into Canada and have not dealt with CARM, that is the first thing to fix.

5The five things that actually cause delays

Border delays feel random. They are not. Almost all of them come from one of five causes, and four of the five are preventable before the truck leaves.

1. The broker does not have the paperwork

Documents sent at dispatch instead of at pickup, sent to the wrong broker, or sent without the PARS or PAPS number. Fix: documents go to the broker when the truck is loaded, with the barcode number on them, every time.

2. The invoice and the entry disagree

A value in the wrong currency, a piece count that does not match the packing list, a tariff classification chosen by whoever was at the desk. Fix: one commercial invoice, complete, used by everyone. Never let the carrier or the broker “fix” a number on their side.

3. A registration or permit does not exist yet

The importer is not in CARM. The foreign food facility is not registered with FDA. The dairy needs an import permit nobody applied for. Fix: these are checked when the lane is set up, not when the load is booked. A ten-minute conversation at onboarding saves a day at the crossing.

4. The manifest does not match

The carrier filed late, filed the wrong number, or filed a manifest that does not match the entry. Fix: carrier selection. Cross-border is a capability, not a checkbox, and the carriers that do it well are known.

5. Examination

Customs can examine any shipment, and some are selected at random. But exams are far more likely when something in items one to four looks wrong, and for certain commodities. You cannot eliminate them; you can stop inviting them, and you can plan for them, which matters most for temperature-controlled freight.

6Bonded and in-transit moves

Not every shipment clears at the first border it reaches. Goods can move “in bond,” meaning under customs control, without being released, to a point where it makes more sense to clear them.

• U.S. in-bond, Immediate Transportation: goods arriving at one U.S. port move under bond to an inland port and clear there. Common for ocean containers bound for Chicago or Detroit, and for consolidated freight.
• U.S. in-bond, Transportation and Exportation: goods cross the U.S. under bond on their way to Canada or Mexico without entering U.S. commerce.
• Canadian goods in transit through the U.S.: an Ontario-to-British-Columbia load routed south of the Great Lakes stays Canadian goods, moving under U.S. bond, and re-enters Canada without duty.

In-bond freight has to move on a bonded carrier, under a cargo control number, and be reported at the destination port within the allowed time. Miss that, and the carrier’s bond is on the line, which is why not every carrier will take it.

7Commodities: what changes for what you ship

The border treats a pallet of machine parts and a pallet of strawberries very differently. The commodities below are the ones we move most, and each one adds its own rules on top of everything above.

Produce and perishables

Into the U.S., food needs FDA prior notice and the foreign facility that packed it must be registered with FDA. Into Canada, the importer needs a Safe Food for Canadians licence and CFIA inspection applies. Both countries have trust and dispute mechanisms specific to produce, PACA in the U.S. and the DRC in Canada, which shape how claims are handled. The real cost of a produce delay is shelf life: an hour at the crossing is an hour off the sell-by date.

Dairy

Dairy into Canada is governed by supply management. Most products need an import permit and fall under tariff-rate quotas; over-quota tariffs are high enough to make a shipment worthless. Dairy into the U.S. faces FDA and USDA requirements and its own quotas under CUSMA. Since September 2026, some Canadian dairy products also face additional U.S. duties or import bans, so check before shipping. Nothing should be loaded until the permit and quota allocation exist.

Frozen foods and seafood

Frozen product has to hold temperature through the crossing and through any exam. Seafood into the U.S. must come from a HACCP-compliant supplier, and certain species fall under the Seafood Import Monitoring Program, which requires traceability data at entry. Into Canada, a CFIA licence applies. An exam that opens the doors on a frozen load is a product-safety event, so it should happen at a bonded cold facility, not on the shoulder.

Alcohol and beer

Into Canada, each province’s liquor authority controls importation; in Ontario, commercial beverage alcohol enters through the LCBO, and excise applies. Into the U.S., the importer needs a federal basic permit from the TTB, label approval for each product, FDA facility registration and prior notice, and then product moves through state-licensed distribution. Beer and wine are temperature-sensitive and attractive to theft, so sealed, tracked, temperature-controlled moves are the standard, and bonded routings are common. Trade measures have changed this picture since 2025: Ontario's LCBO has not stocked U.S. alcohol since March 2025, and from September 29, 2026 the United States has prohibited imports of packaged Canadian beer, wine and spirits. Confirm the current rules with your customs broker before booking.

High-value goods

Electronics, pharmaceuticals, equipment and finished consumer goods are not a customs problem so much as an exposure problem. Standard carrier cargo insurance limits are far below the value of a single trailer. The controls are carrier vetting, sealed and tracked trailers, team drivers on long lanes, no unattended drops near the border, and, where volume justifies it, carriers enrolled in FAST, C-TPAT or Partners in Protection, which move through dedicated lanes with lower examination rates.

8Modes: road, intermodal and ocean across the border

The mode changes the customs clock, the handling and the risk profile, not just the rate.

Over the road

Fastest and most flexible. One carrier, door to door, one crossing, one manifest. The driver stays with the load and the release happens at the booth. This is the default for anything time-sensitive, temperature-controlled or high-value, and for lanes under roughly two days’ transit.

Intermodal

Containers or trailers move the long leg by rail, with a truck at each end. Canada’s two Class I railways run directly into the U.S., and since the 2023 CPKC merger one of them runs a single network from Canada through the U.S. into Mexico. The rail carrier files the manifest, two hours out for Canada. Intermodal is materially cheaper on long lanes, slower and less flexible, and handled at terminals, so it suits durable, planned volume: Toronto to Calgary or Vancouver, Toronto to Texas, Ontario to Mexico. Temperature-controlled intermodal exists and works well for frozen product with predictable schedules.

Ocean

For freight arriving from overseas and continuing across a North American border, the ocean leg adds its own advance data: ISF “10+2” 24 hours before loading for the U.S., and ACI marine data 24 hours before loading for Canada. Containers are drayed from the port and can clear at the port or move in bond to an inland point. The Canadian gateways are Vancouver, Prince Rupert, Montreal and Halifax; the U.S. ones most relevant to Canadian shippers are Los Angeles-Long Beach, New York-New Jersey, Savannah and Houston.

9Road or rail: choosing per shipment, not per year

On long cross-border lanes, road and intermodal are both viable, and the right answer changes with rates, capacity and the delivery window. Cross-border rail clears customs the same way a truck does, with the railway filing its manifest at least two hours before arrival, and suits planned, non-urgent volume. We quote both on every eligible cross-border lane and choose per shipment on rate, transit and service.

10Canada, the U.S. and Mexico: what is different in each direction

Canada and the U.S.

The most integrated border in the world, and the most predictable. A customs broker on each side, or one licensed in both. PARS northbound, PAPS southbound. The driver crosses with the load. CUSMA certification determines duty. FAST lanes for approved carriers, drivers and importers. Tariff treatment between the two countries has changed several times since 2025; we do not advise on duty rates, your customs broker does, but origin certification has never mattered more.

Mexico

Structurally different, and the difference is not paperwork so much as who can drive where. A Mexican customs broker, the agente aduanal, is mandatory and in practice decides which crossing the freight uses. Most freight moves “through-trailer”: the loaded trailer crosses intact, a transfer driver takes it over the bridge, and a Mexican carrier takes it onward, because cabotage rules keep U.S. and Canadian drivers out of Mexican domestic freight and vice versa. Transloading, unloading into a different trailer at the border, still happens for some commodities and equipment types. The Mexican leg moves under a digital tax invoice with the carta porte supplement, and the entry is the pedimento. Laredo handles the bulk of the volume; Eagle Pass, El Paso and Otay Mesa serve specific lanes.

Canada-to-Mexico freight by road is a two-border move: it crosses into the U.S. in bond and then into Mexico. By rail, it can be a single-railway move on a single manifest. For durable volume between Ontario and central Mexico, that is often the better answer.

11Temperature-controlled freight at the border

Everything above applies to a reefer load, plus one thing: the clock keeps running at the crossing. The unit keeps cycling, the product keeps aging and, if the doors open for an exam on a hot apron, the temperature record you will need for a claim is being written in real time.

• Get the paperwork perfect on reefer loads above all others. Every cause of delay in this guide costs a dry load money; it costs a reefer load product.
• If an exam is likely, ask the broker to arrange it at a bonded cold-storage facility rather than at the crossing.
• Keep the temperature record running through the crossing. It is your evidence in a claim, and produce claims in particular turn on it.