Is it possible to go out and cover them? We don't have a lot of cold here, but when we do I cover mine and if it's really cold I put some lights in under the tarp to keep the roots warm. Wrap those roots to keep them warm as possible. We had a very rare 72 hours below freezing followed by an even rarer snow this year and the ones that were outside are coming back. Do your best to keep the roots from freezing and if this cold doesn't last too long they should come back.

Hi thistle,

I'm on the same zone as you. I would bring them inside - I feel it's still too early to bring yournrugs out. We are
Suppose to have a few nights of -2C . You brigs will suffer some damage and a lot of stress. Just heard on the forecast that we may get freezing rain. The week is suppose to be cold.

If you are attached to your brigs, it's not too much work

Go now !

Thanks for your input.I did bring in the Pots I could move and did my best to give the huge one as much protection as I could,fingers crossed they will survive.
I know I jumped the Gun here, but I was desperate to get my space back,I won't be doing that again!

That sounds like a good plan, you would really be surprised by how they weather freezes and even snow as long as the roots don't freeze.

I've found it takes several freezes for the top to die back completely so the one outside should do okay as long as it warms up soon.

More Cold Temps today and overnights not good either,My mind is a bit easier now that I have them inside again,although D.H. is non too pleased.I am hoping they Didn't get too much of a setback and will make it through okay. Lesson Learned,don't jump the gun!!!

I too am in your Zone, near Toronto, and I rarely ever bring mine out until the first of May.I can only manage them out once a season so the May date may mean I need a blanket against a frost but rarely a freezing concern.
The one you left out keep as dry as you can, cold wet roots can terminate them, especially when in pots so they don't drain as quickly as when in the ground.