i can't say i know. roses don't seem to like me, and i've killed three in three years (cheap ones, tho). but i'd imagine a delicate bloom like on a rose wouldn't survive a freeze well at all. check the weather, and when it's going to get way down there, cut off the blooms and bring them inside for a display. that's what i'll be doing with some of my not-frost worthy blooms that are still going. can you even believe i have a second/cut back hollyhock bloom right now? it's amazing.

the outside (as in with a sponge or mister, not a water hose).
If you can put e.g. a candle-fed lantern inside the tent, so much the better (a tea candle in a mason jar set on a brick).

I would think just tenting this tender bud would work well--only one left? Or should you cover the entire rose bush with something not too heavy and not too likely to get caught on the thorns.

Or blow air into the bag and then tie around the stem, perhaps?

Good luck!

insulator--clip as air tight as possible with clothes pins.

What did you did?