(Yes, this guy was in my yard. And about four feet long.)
A couple of times a day, the youngest one will go out and check and there's usually someone under there. So far, most of the snakes are quicker than he is.
I'm not a fan of reptiles myself, but I do appreciate that they eat the mice and moles and other critters I love even less. So they're welcome in my yard. And the kids know that, while the snakes at our house aren't poisonous, they ones in Arizona and Utah probably are.