Yes, the coleus were indoor plants all winter, and they'll have to come inside for the 3 nights, back out during the day. Years ago I bought a plastic tablecloth -pretty big- just for that purpose. I'll put the tablecloth on the floor and put plants on it. My seed-started begonias are still living inside on my light shelves (they barely fit) and have only been out to the deck for short field trips to start to harden off. A few coleus are still there. I chop off the tops when they hit the lights. I also have a few 6 packs of seedlings under lights.
I didn't do much wintersowing this year, only about 12 jugs. Of those that have sprouts, I'll probably move them into my mini greenhouse and I think they'll be OK. Ditto my corydalis sempervirens and echinacea which have been living outside for a few weeks. They should be hardy enough to tolerate the cold snap. (33° tonight, 28° tomorrow night, 36° the next night). A freeze warning has been issued.
Or, I could move all the plants into the garage and park my car outside. Wouldn't be the first time.
Karen