I would suggest the following...

1) Wait till fall (around october) and dig up the rootball of your clematis. Get as big a ball as you can. You can then buy the biggest pot possible (18 wide 18 deep) and use nice potting soil and replant the ball DEEP into the pot. Wheel, roll or carry the pot into your garage, and maybe wrap some nice bubble wrap around the pot. I would also cover the top of the pot with a nice layer of mulch or straw. Put the pot in a sheltered corner. Wait till spring...when the Forsythia blooms, bring the pot out, and replant.

Thank you so much. This is only the 2nd year I've had it and it got off to a rough start this year. First it got frost bit in that freak cold spell and then I accidentally broke it off while weeding. There is only one lonely vine growing this year when last year is was a pretty good size for the first year. But it does have one bloom on it.

If the clematis is in the ground now and it were mine, I would leave it where it is and dig it up next spring when you are ready to transplant ot provided the bed will be ready early in the spring. I can see no advantage to digging it up now and overwintering it in a pot inside.

Okay after rereading your post this AM, I am unsure if the current bed is being removed now. If the current bed is going to be removed now and the plant needs to be moved, then do as shiao suggests. If it can stay where it is now until next spring, then I would leave it where it is until next spring and then transplant. If you do pot it up, the plant would probably survive zone 6 gardens outdoors. I have kept rather small pots of clematis outside over the winter here in zone 7a with no issues. Here is a shot of a pot that stays outside on the north side of my house and has done so for the past two winters with no issues.

{{gwi:618820}}

If you want to add some protection to the pot, you can do as shiao recommened and wrap it with some bubble wrap, surround it with bales of straw, or even dig a hole and submerge the pot in the ground.