Frozen bench grafts

[Northbound]

So I bench grafted 150 trees about 2 weeks ago. Put in Rubbermaid tub with damp potting soil and perlite. I had a extra tub worth of the mix for when my next batch of rootstock showed up. Anyways I thought I put the tub with trees in my basement, went to check them this morning and realized I put wrong tub in basement, the trees have been in a tub on my porch for last 2 weeks. Completely covered in the damp soil which is now froze. What are the odds they'll survive? It's a covered porch so at least the tub wasn't being warmed everyday

 

[Turkey Creek]

I wouldnt write them off. I have had both scion and root stocks freeze in a refrigerator that got too cold. They lived. Not saying I would recommend that approach, but it doesnt necessarily mean you lost them all.

 

[Prof.Kent]

My bet is they are fine. Drying out of rootstocks or scions is what kills them, either by dehydration or by budding/leafing out with no way for roots to make up lost water.