I do not see how you are going to get frost protection with
holes in the material. You cannot have airflow and frost
protection both unless you have holes that can be closed
at night.
You could probably do as well with clear garbage bags: drop
them over the cages or short stakes at night and clothespin
the bottoms up a foot or so once the temperature gets above
40F. (You do need to be at home until it warms up that much
to do this.)
If it is a rainy day, just leave them on there.
You may have to hunt around to find clear bags, but I had
a big roll of them a couple of years ago, so I know that they
are made and sold somewhere.
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