Is Canada a major source of fentanyl entering the United States?

Fentanyl does cross the northern border, but Canadian seizures are a tiny fraction of the amounts seized at the southwest border.

U.S. border seizure data for fiscal 2024 recorded approximately 43 pounds of fentanyl at the northern border and 21,148 pounds at the southwest border. Congressional research has described Mexico as the predominant production source for illicit fentanyl destined for the United States, often using precursor chemicals from China. This does not mean no fentanyl comes from Canada; it means the evidence does not support describing Canada as a major source on the scale implied by the claim.

Some fentanyl does cross from Canada into the United States, but available U.S. data do not support describing Canada as a major source of the U.S. fentanyl supply. In fiscal 2024, U.S. authorities seized about 43 pounds of fentanyl at the northern border versus more than 21,000 pounds at the southwest border.

Fentanyl trafficking does occur across the Canada-U.S. border, and Canadian authorities have uncovered significant illegal fentanyl production. Canada therefore has a real enforcement responsibility, and seizure totals are not a complete measure of everything that crosses a border. Canadian-produced fentanyl can also reach markets outside Canada.

The claim commonly treats Canada as though it were comparable to Mexico as a source of fentanyl entering the United States. The available scale evidence does not support that equivalence. U.S. border authorities seized about 43 pounds at the northern border in fiscal 2024 compared with roughly 21,148 pounds at the southwest border, and northern-border seizures represented well under 1% of U.S. fentanyl border seizures. Seizure figures are an imperfect proxy for total trafficking, but the disparity is too large to omit.

The claim has been used to frame Canada as a major source of the U.S. fentanyl crisis. That can affect border policy, tariff arguments, policing priorities, and how Canadians understand the actual scale of cross-border drug flows.

Border seizures do not measure every illicit shipment, so the exact volume of fentanyl moving from Canada into the United States is not known. The available scale evidence nevertheless places northern-border seizures far below southwest-border seizures.

Credible law-enforcement, intelligence or trafficking-flow evidence showing that Canada supplies a substantial share of U.S.-bound fentanyl would require reassessing the 'major source' conclusion.

Direct White House presidential action tying Canada to the fentanyl emergency used to justify tariffs, rather than a later fact-check describing the claim.

Some fentanyl and fentanyl-related contraband enters the United States from Canada — Supported Canada has genuine domestic fentanyl production and trafficking problems — Supported Northern-border fentanyl seizures are comparable in scale to southwest-border seizures — False Canada supplies a substantial or major share of fentanyl entering the United States — Misleading / not supported by available seizure and trafficking evidence

Canada; United States

White House / President Donald Trump

Canada fentanyl U.S. border seizures northern border Mexico tariffs

Fact check: Fentanyl crosses the Canada-U.S. border, but Canada is not a major source compared with the southwest border.