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covers coming loose in high winds and harvesting problems when snow and ice stick to the tunnels. One December was quite dismaying, when I could see plentiful salads inside the tunnels, out of my reach for the icy snow which had made them impossible to open!
Cold frames are the next step up, for accessibility and permanence. Well made cold frames will last for years (don’t use pressure treated lumber; cedar works just fine), provide a bit more protection than tunnels and may be used to force bulbs and start finicky perennials.
They can take up a lot of garden space, though, for growing large quantities, unless you devote a whole garden area to frames as one of my former neighbors in Slate Mills did. Pushing snow off the lights (glass) is easy, and the frames too should be covered at night in very cold weather.
My preferred method, though I have and will still use the other two, is a single outer layer, unheated hoop house, with low tunnels
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