As a general rule, land borders are far less onerous to cross.
The last time I crossed into Mexico by land about 4 years ago, you don't even interact with any border agents. If you paid the 25 cent toll to cross the bridge, then boom you are in Mexico (if you drive across there are lanes with border guards and they do ask for a passport as they want to regulate the motor vehicles entering). Coming back to the US yes they ask for ID but it's extremely casual and typically you just walk past a guy at a desk.
As I posted above, you can enter via land borders without a covid test, so I would imagine you could also enter without a jab. But also as I posted above, the law means nothing to them, so beware.
The last time I crossed into Mexico by land about 4 years ago, you don't even interact with any border agents. If you paid the 25 cent toll to cross the bridge, then boom you are in Mexico (if you drive across there are lanes with border guards and they do ask for a passport as they want to regulate the motor vehicles entering). Coming back to the US yes they ask for ID but it's extremely casual and typically you just walk past a guy at a desk.
As I posted above, you can enter via land borders without a covid test, so I would imagine you could also enter without a jab. But also as I posted above, the law means nothing to them, so beware.