However, pre-entry COVID-19 tests will still be required for partially vaccinated or unvaccinated travellers ages 12 and older who are currently eligible to travel to Canada.

Source: Canada changes COVID-19 border rules for unvaccinated, partially vaccinated kids

Americans returned to the U.S., by air, are required (by the U.S.) to have a negative Covid test within 24 hours of departure. However, those arriving by land, at Canada-U.S. border crossings, are not required to have a Covid test.

COVID-19 Testing Required for U.S. Entry (state.gov)

These changes make it much simpler – finally – for U.S. residents to travel to and back from Canada.

By EdwardM