I have been using one of those portable greenhouses for three years for all my hardening off. I just need to make sure I open it completely early every morning, and close it each evening before the temp dips too low. Except for the high winds taking it down about a week ago, it has worked great. I usually put a cinderblock on the bottom shelf, but hadn't gotten around to it and after planting out most of the cool weather crops, it was almost empty.
This year will be the last for it -- the sun has taken it's toll on the cover and it's starting to dry out and crumble. I already picked up a replacement for $18. I may keep the frame from the old one and see if I can fashion up a cover from some plastic sheeting. I have a large roll of plastic "drop cloth" I bought in the paint dept. of Home Depot which should work.
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