How can I keep my rubber tree plant alive outdoors in winter?

I live in a warm climate, similar to Georgia in the southern USA, but winters are dry and temps can drop a little below freezing at night. Daytime is usually 10 to 15C and sunny in the daytime. I have a rubber tree plant but it's too large to bring into the house. I'd also like to avoid spending a lot of money at the DIY center on a kind of mini greenhouse.

Can I keep it outside covered with a thick translucent garbage bag perhaps? Water every couple of days.