If your temperatures get in the teens in winter they will need far more than plastic on the open side.
Chinese Blue Breasted Quail aka Button Quail originated in Southern China and Indonesia. They
cannot tolerate teens and single digit temperatures.
The two that responded to your original post are from warm climates.
I just got some chicks off a guy yesterday that also raises button quail and he told me they stay outside all the time I live in Pa. so it gets cold here but I would check into this more, better safe than sorry. Good luck.
Ok. Thanks to you all. If David lives in Virginia then he gets an idea of the weather. But if you live in Pennsylvania then thats pretty cold. I'm in Tennessee so I will read more into it. Thanks to you all.