The trade war between the United States and Canada has taken a personal toll on American farmers, with both countries imposing significant tariffs on each other’s goods. The escalating tensions, which began in mid-August 2026, have raised concerns about the long-term impact on US agriculture and food prices.
President Donald Trump‘s decision to impose 50% tariffs on Canadian imports worth roughly US$20 billion (CAD$27 billion) has sparked retaliation from Canada. On August 25, 2026, Canada announced plans to impose retaliatory tariffs of 15% to 50% on US goods, effective September 8. The list includes dairy products, agricultural equipment, and potentially even fertilizer components crucial for US farmers.
Canada’s tariffs and their impact on US farmers
While Canada’s tariffs are not directly aimed at farmers, the ripple effects are expected to be significant. Tariffs increase the cost of imported goods, and when China responded to US tariffs in 2018, it directly affected the American agricultural sector. Research shows that US agricultural exports to China fell by $7 billion to $10 billion annually as buyers shifted to Brazilian suppliers.
Canada is one of the largest markets for American food, importing about $28 billion in US agricultural products in 2026. The two countries are deeply integrated in agricultural trade and farm equipment markets. Tariffs can raise costs along the supply chain, affecting everything from live cattle to processed foods. Canadian officials have recognized this and included several billion dollars in aid for their farmers in the tariff plan.
The fertilizer risk and its consequences
Canada is a major source of potash a critical ingredient in fertilizer that US farmers rely on. If the trade war escalates, Canada could impose export tariffs on potash, raising prices for US buyers. This would have a widespread impact on US consumer prices and could give Canada leverage in future negotiations.
Crops require three main nutrients: nitrogen, phosphorus, and potassium. Potassium comes almost entirely from potash, and American mines produce less than 1% of the global potash supply. The US imports more than 80% of its potassium from the Elk Point Basin in Saskatchewan, Canada. The geology-based constraints in US agriculture make potash a crucial component that was notably absent from the US tariff list.
How trade policy changes growing decisions
American farmers are already facing high fertilizer costs due to the US and Israeli war with Iran, which disrupted shipping through the Strait of Hormuz. A Farm Bureau survey in April 2026 found that 70% of farmers couldn’t afford all the fertilizer they needed during spring planting. Nitrogen washes out of soil and must be reapplied every year, while potassium and phosphorus build up as a reserve.
When fertilizer prices spike, farmers tend to cut phosphorus and potassium first and nitrogen last. However, restoring potassium in soil takes time, with several pounds of fertilizer needed for every pound of soil-test potassium recovered. Even a one-year restriction on potash access can have long-term impacts on crop yields and food prices.
Uncertainty and its effect on farmers’ choices
Economic research shows that trade policy uncertainty affects agricultural decisions even before tariffs take effect. Farmers who cannot predict next year’s costs may delay purchases, hoping prices will ease. Fertilizer is often bought months ahead of planting, so hesitating in the fall can mean less fertilizer is applied in the spring. Uncertainty alone can reduce what gets applied before any tariff exists.
If US farmers face higher prices or short supplies for potassium fertilizer, the effects over time could lead to smaller yields. This would translate to higher food prices at the grocery store long after the tariffs are likely to be lifted.
The intertwined economies of the US and Canada
The trade war highlights how deeply the economies of the US and Canada are intertwined. Canada is the US’s second-largest trading partner after Mexico, with energy at the heart of that relationship. The two countries exchanged about $872 billion in goods and services last year, and Canadian crude imports equal nearly 20% of total US petroleum consumption.
Canada also supplies aluminum and potash to US farms and parts for an auto industry built on both sides of the border. The US relies heavily on Canadian oil and natural gas, as well as deeply integrated industries such as autos. Much of Canada’s crude flows to Midwest refineries built to process its heavy oil into gasoline, diesel, and jet fuel.
The trade deficit with Canada, frequently cited by the Trump administration, is largely due to US purchases of Canadian energy. Without energy, the US would have run a trade surplus. The intertwined nature of the two economies means that any escalation in the trade war could have significant consequences for both countries.
The trade war between the US and Canada is not just about tariffs on goods; it’s about the interconnectedness of the two economies and the potential long-term impacts on agriculture, energy, and consumer prices. As the situation unfolds, the effects on American farmers and food prices will be closely watched.
