This is a picture from a couple weeks ago of one of my tomato beds with hoop house cover pulled back during good weather.
Here's a picture of it covered on top for protection against hail but with sides left open for ventilation. This is how I am leaving them while I'm not home until the spring storms pass.
This setup works for any size bed. Pipe straps are screwed on the inside of the boards and the pvc just slips in making it easy to remove during summer.