Harvesting after frost

These storm windows worked well protecting my plants from frost.

 I open them so my plants aren't over heated during sunny days and slide them closed when the forecast is for a cold might.

Beans and tomatoes are frost sensitive. Carrots are OK with a few nights below freezing. I still have a lot of green tomatoes that I want to finish vine ripening as long as possible. After one night of frost, I'm still collecting good harvests!
So far, I've added 1 month to my 4 month long growing season.