I have some 2X2 frames with chicken wire on them to keep out the rabbits. I was thinking I could easily staple some plastic over the wire and make it into a mini greenhouse, cold box, or whatever they are called.
You know the white frost covers. Just put up some 2x2 stakes 4' long & we used shade cloth black 30% & tied that off to the 2x2s first. Then we stretched the white row covers over that. It will withstand more wind & overnight snow. Make sure to leave easy entry to harvest your greens.
Frost is freezing temps with water & that will burn plant tissue faster than just freezing temps. Keep the leaves dry water only in the am to prevent excess water from damaging the tissues.
We live in the Mountains of Western NC & the temps over winter can become a killer on Fruit trees & vines. Last Winter our fall garden as we call it was frozen in early Dec & then the rest of the winter was mild. Mild until it dropped to single digits when our Peach trees were in full bloom. Mother nature is in charge.
We have grown organic food since the 70s & we can share one thing we learned.
Growing your own food is Magical it's like being nearer to God, it's also pretty darn depressing.

What?? Well we plan & dream over new seeds we have or are going to get. We buy lights & heating mats, soil & supplies to care for our new plants. Sometimes Mr. Murphy has his say.
Have you started all kinds of new & unique seeds, & brought them to where you plant them in ground. Then as happens in nature, a frost comes along & kills them all.
Off to anywhere now to buy starts from all the usual places after everyone had picked through them all. Bummer!
So what did I learn?
Living & growing with plants is a never ending story from year to year it does not stop for seasons. We plant our hopes & dreams onto a planet with extreme weather that can destroy or nurture you work. That's life.
In the way past when we were young, we did get bummed out over our garden failures. Over the seasons we started to see a pattern. Fruit trees producing a large crop every other season. Cool spring slow start watch & spray for Fungus & virial problems.
Nature will keep you in the loop, if you watch & listen to her. It's in you already to feel nature.
We learned to enjoy all the little things that turned out well, & believe me they do outnumber the sad times we have from time to time. Growing food is not new, & we can learn so much from other growers if we listen with our hearts.