I plan to try to make a cold frame this year. I tried putting plastic sheeting over our garden two years ago in the spring, and it killed everything. So I learned that ventilation is very important. Since we live in MN we could definetly use one. I found a couple cool videos on how to make cold frames cheaply so I thought I'd share them. I'll post examples of my own when I make mine in early spring. Let me know if you have tips on making one!
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Here's a blog entry that had a good example and detailed plan for building a cold frame from PVC.
And here's one with a cool automatic vent opener