Youre right: Obviously groomers are controlled. I dont know if they control the "patches" in between.(they prob do in some situations)
I have also read about " ski routes" they are not groomed but they have signs with numers instead off colors. You probably have to wear avy gear there.
i found this on wiki:
Off-piste" is a British term. Only the marked runs (pistes) in European ski resorts are controlled, with the "off-piste" areas between & beside these runs often holding dangerous backcountry conditions. Since all terrain within U.S. ski resort boundaries is controlled--including the areas between & beside runs--the terms "Slackcountry
" or "Mid-country
" are often used instead of "off-piste", & refer to skiing that occurs by crossing ski resort boundary ropes to make turns, then returning to the resort to ride the lifts.
Bad weather, best rides.