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!