NG,
I agree with RP, and taking it a bit further, the bigger concern is the freeze/thaw could turn the roots of the plant to mush pretty quick.
Of course, its do as I say, not as I do; cause my plants are all still on the porch. My low temps have been 25F at night, all of the pots were frozen solid. Yesterday the porch went to a high of 42F during the day so everything is thawed out. The weather is expected to stay like this through next Tuesday, then a new cold front is to come through.
To keep your pot outside constantly, I think you will need to figure some sort of insulation that would either keep it frozen or keep it just above freezing. You could try putting your pot into a much larger pot and pack between them the packaging peanuts. At night I'd further consider covering the whole plant with perhaps a cardboard box. You might be able to dig yourself an igloo of sorts in the snow and put the plant inside, or at least surround the pot with snow packed against it.
I've got a couple of days to figure out what to do with mine, I think my porch will stay at just above freezing for the next couple of nights, then I'm back in problems. I've got to figure out how to keep them above freezing cause I don't want the porch to get that cold for other plants that I have out there.
You might be able to get away with bringing it in at night and taking back outside in the AM as long as the weather stays the way it has been.
Well, good luck,
Linda ö¿ö