The Canada-U.S. tariff fight is beginning to change not only what crosses the border, but how companies arrange transportation before a truck ever reaches it. Tariff deadlines have produced sharp bursts of freight demand, while tighter trucking capacity and volatile fuel costs have made last-minute transportation harder to budget.
That combination is encouraging more shippers to secure capacity earlier and rely less heavily on the spot market for predictable, recurring lanes. The shift is not absolute—spot freight remains essential for urgent, irregular and overflow shipments, and Canadian spot activity recently surged. Instead, the emerging strategy is about reducing exposure to sudden rate swings at a time when trade policy can move freight volumes dramatically from one week to the next.
Tariff Deadlines Are Distorting Normal Freight Patterns
The contradiction at the heart of the current freight market is striking. Companies are becoming more cautious about depending on spot transportation even as Canadian spot freight volumes have been exceptionally strong. Loadlink data reported by Truck News showed overall Canadian freight volumes in August were 63% higher than a year earlier. Southbound loads headed to the United States jumped 45% from July and were 112% above August 2025 levels. Cross-border freight accounted for 61% of postings from Canadian customers.
Much of that strength, however, appears tied to timing rather than a simple acceleration in underlying demand. Freight analysts linked the August jump to shippers moving products ahead of new U.S. tariffs. C.H. Robinson similarly reported that companies accelerated Canada-to-U.S. deliveries before the August tariff implementation date, temporarily tightening capacity and lifting pricing on some corridors. That makes the spot surge less reassuring than it initially appears. A manufacturer facing another tariff deadline may suddenly need dozens of trucks; weeks later, the same lane can cool quickly. For transportation planners, that volatility makes predictable capacity increasingly valuable.
Spot Freight Is Becoming a More Expensive Form of Flexibility
Spot freight exists for a reason. It lets a manufacturer cover an unexpected shipment, gives a retailer capacity during a sales surge and allows companies to move goods on lanes where they do not have enough regular volume to justify a long-term commitment. But the price of that flexibility becomes harder to tolerate when truck availability is tight and demand can shift abruptly because of trade policy.
C.H. Robinson estimates Canadian truck capacity is near a five-year low based on Loadlink’s Truck Index, giving carriers greater pricing leverage. TRAFFIX has also warned that companies relying heavily on spot freight, expedited transportation or high-demand lanes should budget for elevated costs. Its mid-2026 analysis found spot rates had moved above many existing contract rates during the spring and early summer. The practical result is a different calculation for a shipper with predictable weekly freight. Saving money by waiting for the open market becomes less attractive when a tariff announcement, seasonal event or capacity disruption can suddenly push the same lane higher. Flexibility still matters, but companies increasingly have to decide how much volatility that flexibility is worth.
Contract Capacity Is Becoming a Hedge Against Transportation Volatility
A contract rate cannot make tariffs disappear, but committed capacity can remove one source of uncertainty. Arrive Logistics reported in its August market update that transportation contract reconfigurations had improved routing-guide performance and reduced the need for spot capacity. Overall tender rejections had fallen to roughly 13.5% as revised contracts helped more freight move through established carrier relationships rather than spilling unexpectedly into the open market.
That does not mean contract freight is becoming cheap. Cass Information Systems reported its Truckload Linehaul Index was 11.3% higher year over year in August, and noted that the much larger contract market was continuing to adjust upward even as spot pricing softened from recent peaks. TRAFFIX has likewise expected contract pricing to rise as earlier spot-market strength works its way into carrier negotiations. For companies, the attraction is therefore less about securing the lowest possible price and more about reducing surprises. A slightly higher negotiated rate can be easier to manage than repeatedly discovering that trucks are scarce precisely when a tariff deadline, seasonal rush or unexpected inventory decision forces freight onto the road.
The Scale of Canada-U.S. Trade Makes Small Disruptions Matter
Cross-border transportation is not a niche corner of the Canadian economy. U.S. Bureau of Transportation Statistics data showed $67.9 billion in freight moved between Canada and the United States in June 2026, 17% more than a year earlier. Trucks alone carried $35.9 billion of that bilateral freight during the month. Detroit, Port Huron and Buffalo remained the largest truck gateways for U.S.-Canada freight flows, highlighting how concentrated important parts of the network remain.
That scale explains why seemingly small shifts in freight timing can quickly affect capacity. Trucks need economically viable freight in both directions. If exports weaken on one side of the border, carriers may have fewer reasons to position equipment there, which can eventually make trucks harder or more expensive to obtain for the return trip. The Canadian Trucking Alliance has warned that weaker Canadian exports can therefore create equipment imbalances extending beyond southbound freight. Current conditions illustrate how quickly the opposite can also happen: Loadlink recorded a sharp August surge southbound while inbound U.S.-to-Canada spot loads fell 29% from July. For a shipper, the direction of travel increasingly matters almost as much as the overall freight market.
Tariffs Are Adding Complexity Before Transportation Is Even Purchased
The latest tariff measures have given logistics departments another layer of variables to manage. The United States imposed a 50% tariff on approximately $27.6 billion of designated Canadian goods effective August 22. Canada subsequently introduced counter-tariffs of 15%, 25% and 50% covering $27.6 billion of U.S.-origin products effective September 8. The Canadian list includes products across industries such as steel, dairy, appliances, agricultural equipment, pulp and paper and electronics.
Transportation departments do not necessarily pay those duties themselves, but tariff exposure can determine whether a shipment moves at all, when it moves and how much inventory a customer wants. Export Development Canada has advised businesses to review contracts for responsibility for tariff payments, cancellation or renegotiation provisions, pricing adjustments and Incoterms. Customs classification, origin documentation and compliance have become more important as well. That administrative uncertainty can spill directly into freight procurement. A company that does not know whether an order will remain commercially viable after a tariff change may hesitate to promise long-term volumes. At the same time, once the decision to ship is made, waiting until the last moment to find a truck can introduce a second layer of risk.
Companies Are Changing Inventory and Sourcing Decisions Too
Transportation strategy is only one part of a wider supply-chain adjustment. Tariff uncertainty has already encouraged businesses to pull inventory forward, reposition goods and reconsider where products are sourced. C.H. Robinson reported that the August tariff deadline prompted accelerated cross-border deliveries, while Arrive Logistics found tariff-related import pull-forward activity had contributed to earlier-than-normal freight demand before fading later in the summer.
Changes are also appearing farther upstream. Reuters reported in September that Canadian grocers were increasing Canadian sourcing and finding suppliers in countries including Spain, Brazil, Morocco and South Africa as demand for U.S. products shifted. One Ontario grocery operator said his stores had moved to roughly 90% Canadian produce, while government data cited by Reuters showed the U.S. share of Canadian vegetable imports had fallen to 62.6% in July from 69% in the comparable period of 2023. These sourcing changes matter to freight planners because new suppliers create new lanes. A truck that once moved on a predictable Ontario-U.S. route may be replaced by domestic transportation, port drayage, rail or another international logistics chain. Contracting decisions naturally change with it.
Fuel Costs Are Making Last-Minute Freight Decisions Even Harder
Trade uncertainty is colliding with another major transportation expense: fuel. Truck News reported that the U.S. weekly diesel average reached $5.967 per gallon for the week ending September 7, while rapidly rising fuel costs were erasing much of the benefit carriers were seeing from higher posted spot rates. Fuel-adjusted spot rates fell even while nominal pricing on some equipment categories increased.
The impact can be seen beyond trucking. CN’s published intermodal fuel surcharge for the week beginning September 14 was 38.11% for intra-Canada movements and 48.50% for U.S. movements, based on the relevant diesel benchmark. The scheduled surcharge for the week beginning September 21 rises further. Fuel formulas differ among carriers and transportation modes, so those percentages should not be treated as universal freight increases, but they illustrate how significant the energy component has become. For a company buying transportation at the last moment, the calculation now includes not only basic linehaul pricing and truck availability but also rapidly changing fuel charges. Contract arrangements with defined fuel tables can at least make the mechanism more predictable, even when the underlying fuel price remains volatile.
The Likely Future Is Less Spot Dependence, Not the End of Spot Freight
The emerging strategy is not to abandon the spot market. In fact, a healthy transportation program often needs spot capacity for new customers, unusual lanes, seasonal demand, urgent orders and overflow when contracted carriers cannot accept a load. TRAFFIX’s outlook for Canada-U.S. freight explicitly points toward a mixture of spot opportunities and higher-priced periods rather than a complete move to one procurement model. What is changing is the amount of predictable freight that companies may be willing to leave exposed until the last minute.
Industry guidance increasingly emphasizes earlier booking, multiple carrier relationships and alternative modes. TRAFFIX recommends committing important lanes earlier to reduce the need for expensive spot shipments, while Maersk has similarly advised customers on several constrained North American trades to book weeks ahead and maintain flexible routing options. Export Development Canada is encouraging businesses to reassess contracts, sourcing and supply-chain vulnerabilities as trade rules change. For cross-border shippers, that produces a more defensive transportation model: contract the dependable base volume, retain spot capacity for genuine flexibility and build alternative carriers and routes before they are urgently needed. In an uncertain tariff environment, reliability itself is becoming something companies are willing to pay for.
