I wrap the cages with bubblewrap when I plant early and my plants outgrow the walls-o-water -- it's a little sturdier in the wind and rain than plain plastic. I get it on freecycle.
When temperatures below 45 or so are forecast, I've found the most important thing is to have the top covered, because if early morning dew lands on the leaves, it may freeze (if it gets cold enough). So I have a gap between the bubblewrap and the "roof" (=another piece of bubblewrap, a piece of screen, or a plastic bag). That way, air can flow through, but the plants are protected from dewfall and wind.
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