I have taken certain snakes outside for pictures but not just to roam around. My biggest worry would be a mole hole that I cant see under the grass but a snake could just disappear in one. That and I wouldnt want to risk snake mites. There are alot of grass snakes like garter and rat snakes around my house so there is the chance of mites. Hawks, falcons, you name it. I guess Im just paranoid but I wouldnt risk it myself.