To keep food growing through the winter, a shelter is needed.  I built the cold frame out of two halved 2"x10"x10' treated planks.

Align the boards and drill pilot holes:

Screw the ends together:

Add a stabilizer, if you like.  This just helps keep the structure square during transport:

A prefect square frame.  Position in your garden and line with cardboard.

I added fill dirt and potting mix (about 2 inches of each):

Now it's ready for a cover (glass, poly, blanket, etc.) to keep out the bitter cold.  It only needs to be covered when the temperature is freezing.

Stay posted to see what grows!