Hi there as you can see I'm in zone 6a and the temps are below freezing. I'd pull your tomatoes off the vine and put them in a box with a lid. Line the box with newspaper. Place your unripen tomatoes in a single layer. Cover them with newspaper and close the lid. They will ripen in time. As to the blossoms you can leave then on the vine. They will probably never produce fruit but who knows with the crazy weather we are experiencing these days you never knows. Good luck and Happy Thanksgiving!

My understanding is that tomatoes slow down or even stop ripening when day and night temperatures remain under 55 for three or four days. They certainly don't develop very good flavor in that environment. We had a long cold spell -- with lows down to 40 and highs in the mid-50s -- in September in southwestern Ohio, and none of the large green tomatoes on my plants ripened the whole month. Usually I can harvest ripening fruits into mid-October. I did pick a few green tomatoes at the beginning of the cold spell, and they ripened within 10 days sitting in the open on my counter. They tasted better than the green ones I brought inside to ripen after the cold spell.

By the way, I find that most of my large green tomatoes will ripen out in the open. I had more problems when I wrapped them in newspaper or, worse, set them on a sunny window sill.

We just pull the whole plant, roots and all. Hang the whole plant upside down in the garage. All green tomatoes continue to ripen same speed as in the ground.
Clean off extra branches and leaves to cut down on the mess as it dries
We do this before we get a freeze every year in Nov.