bigmoe said "If it’s a same day trip can you not get tested up here before you leave? "
Just to add. Back in December for a brief period of about two weeks you could take a PCR test up here, drive to the US and return using your test results and ArriveCan app as long as it was within 72 hours. They stopped that when Omicron came.
So now I assume you can do the same thing only with an antigen test.? I haven't been able to confirm this though. I haven't been able to find any info on the net about brief trips down and back.