At the end of last year I put my dilapidated cold frame over two small rows of salad and spinach and in spite of the dreadful cold winter they have made it through and back at the end of January I took the first crop of the year 
I wrapped the cold frame in bubble wrap and that seems to have worked.
The carrots weren't so lucky. I covered them with chicken wire but rabbits got in and have taken the tops off more or less every single one

I wrapped the cold frame in bubble wrap and that seems to have worked.
The carrots weren't so lucky. I covered them with chicken wire but rabbits got in and have taken the tops off more or less every single one

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