PHew! I'm in Quebec, no frost in the forecast here.

My dahlias are already out of pots.

I am taking my chances

{{gwi:528736}}

Frost warning here zone 4 Quebec - and again maybe Wed. night - my plants are just starting out in pots in the screened-in porch, and I presume only persistent hard frost would harm them there. There are too many to move - would covering with blankets be advisable? There is negligible growth so far, but definitely growth. Poochella? Do you agree?

IF they are indoors in your screened in porch, they should be okay. I would be tempted though to throw a sheet over them, just to trap any heat in. Don't use plastic.

I agree with whatever Jroot says as he lives in Canada and is far more astute on the particulars of your latitudes. I had a few dahlias holding on an open front porch in pots, all up several inches, and even without frost warnings I moved them under a bench and draped a towel over the bench (placed next to the house) to give the dahlias a little cover on a chilly night. Better safe than sorry.

I hope your days and nights soon warm beyond frost warnings in the land of our neighbors to the north. Northeast in your case!

It would be interesting to see a thermal image of the variations in temps next to a house, a foundation, a rock wall vs out in the open as a night progressed during these cool spring weeks.

A few of my dahlia shoots were zapped by the frost a couple nights ago :( I should have left them in my screened in porch, but I'd never have guessed we would have frost after Victoria Day - besides, it was getting crowded in there!