@beckygardener,
I have four aluminum party tent supports I salvaged, that I use for the tops on a few small cold frames. Then when needed I have clear plastic with wood slats on each edge to keep the wind from blowing them off, plus black felt like black covers to put on when it really gets cold. They are very portable and durable and not much trouble at all to move around the garden. It is a very light weight setup and pretty versatile. I have one that I have metal mesh attached to, and also I have some nylon netting with wood slats that I can use when I need to keep critters out. It has proven to be a very nice "tool" to be used in many different ways.
