Around here, short grass, concrete and exposed dirt will attract a snake to lay out and soak up the evening sun. My driveway at last light has had snakes on it over the years including copper heads and cotton mouths. Two years ago, when it was crazy here, I had a very fat cotton mouth laying on the driveway when I was taking the garbage out. It was a stalemate, it wasn't moving and I didn't have anything to move it. I went back to the house for my snake gun, but by then, it had left. Several copper heads have been run over on my driveway by myself, and friends. They seem to be the most common snake found on the gravel. Last year we had what was probably a young rat snake come across our back yard lawn, which is always cut super short, and mostly dirt right now with all the work I have going on installing a swimming pool, and it worked it's way right towards my wife and I while we where sitting by our fire ring. This was a little after dark and I have no idea what it was thinking. Before I can shoot a snake in our back yard, we have to get the dogs away from it. While doing that, the snake worked it's way into the ditch between the cinder blocks of the pool and the dirt. Two other times, something very similar happened, but the dogs saw it before we did, so there was real panic on my wife's part to get the dogs away before they where bit. Fortunately they where both rat snakes. And then another night we had one come out on the driveway, and got between me and the firewood that I was going to get for the fire we had going on the back porch. It never made it into our yard, and the dogs never reacted to it, but it sure surprised me!!! They are very active in the evening, and you have to be extra careful where you go regardless of how short the grass is, or if you are even on grass.
Again, two years ago, a friends 5 year old was playing on their back porch and somehow got a toy behind a flower pot. He was bit on the hand by a cotton mouth that looked more like a copper head. Cotton mouths are the hardest snake to identify. A mature one is easy because of how fat they are in their body, but a young one can look like a rat snake, or if they just molted, their patterns can actually look like a copper head. If you google image them, you will see a huge variation in markings and coloring!!!! They flew her son to Dallas for treatment and after several months, he was able to keep his arm. It took that long for them to know for sure!!! Another friend, that same year, got bit on the foot by a copper head while closing their gate. She was in flip flops and never looked for it, just another day closing the gate. It wasn't a bad bite and she recovered fairly quickly without any issues. I know other people that have been bit, and it's all pretty much the same. Lots of pain, lots of time in the hospital, and months to recover. When I see a snake, I don't take any chances, I kill it.