While a U.S. passport is the "gold standard" for travel, U.S. citizens can technically enter Canada by land or sea without one if they have an Enhanced Driver's License (EDL) or a NEXUS card. An EDL is a special type of license issued by states like Washington, Michigan, New York, Vermont, and Minnesota that proves both identity and citizenship. If you are traveling by air, however, a valid U.S. Passport is mandatory for all citizens under international aviation regulations. For land crossings (driving across the border), you must present proof of both identity and U.S. citizenship. If you do not have a passport or EDL, you might be allowed to enter with a combination of a government-issued photo ID and an original Birth Certificate, but this often leads to significant delays and secondary questioning at the border. In 2026, the Canada Border Services Agency (CBSA) strongly recommends a passport to ensure a smooth, automated entry process. For children under 16 traveling by land with their parents, a birth certificate (original or copy) is generally sufficient for entry. Essentially, while there are "workarounds" for land travel, a passport remains the only document that guarantees entry across all modes of transport.