Here in my part of Texas the most common type of scorpion is the bark scorpion. They climb as well as any spider. Up walls, into bath tubs, sinks, on the ceiling, everywhere you might see a spider. I see them, mostly at night, around my barn. They live in the trees and grassy areas, but they move around at night hunting, and usually it is the movement that catches my eye.
I am pretty serious about not getting stung AGAIN if I can avoid it, so I spray the perimeter of buildings regularly to keep them at bay. FYI - I have just used the Ortho Home Defense Max, which has worked, but a neighbor told me that Demon WP Insecticide will last much longer, so going to try it and see.