This is one of our 4' x 8' raised veggie beds shown just after I planted it with fall lettuce and chard. The hoops are 1/2" pvc pipe (10'), although smaller fiberglass hoops are available, and the covering is just the typical green plastic "chicken wire" fencing. It was not intended to actually fence out anything - I'm trying it out as support.
(The thing in the background is our remaining "little" hoop house or high tunnel, being only half sized at 50'.)
And this is what it looks like with the Remay row cover over the frame. Snug as a bug for the winter weather. This isn't a heat generating greenhouse, as a clear plastic cover would be, just a retainer for ground warmth and something to block the really strong, cold winds of winter.
It's easy to lift a side to harvest fresh greens.
FYI, for my Town Gardener friends, we're usually taking ice off the cars, at least one or two mornings each week, before the end of October. Those beautiful, clear autumn nights?
It gets cold out here, friends, cold out here.