Where to?

I checked the map and have decided to go a bit further (not really all that far tho) and see Old Faithful in Yellowstone, I've never been to Wyoming (the state that only has 2 escalators! total!) and am already probably 80% of the way there. I stop in Bozeman, MT for the night. It's not too late and very warm out so I sleep outdoors, how romantic. Most of the area is rolling pasture land, I drive down a couple random dirt roads and find a quiet spot, shouldn't need tent so I setup Thermarest and sleeping bag in the grass and sleep. Not sure if this is normal or if I will get in trouble or what but all good.

Wake up wet the next morning, it is raining a bit.