Postscript: A week after the freeze....
I'm bummed. Not trying to be hasty or hysterical but it appears my Tsuma Gaki and Seiryu could be toast. The Tsuma Gaki was planted last late summer and the Seiryu just a month ago(I know...stupid.... should have kept it in a pot until danger past).
Both quite suddenly have major areas of dreaded greyish-tan in the upper branch areas. I'm not talking simply the new growth. These are major branches. The healthy plum/green color left these areas incredibly quickly; seemingly overnight or at most a matter of days.
Given that I'm a novice at growing these can the trees be salvaged even in spite of what appears could be some major, extreme pruning? The Tsuma Gaki is probably 30 inches tall. The Seiryu on the other hand is almost 50 inches tall and has multiple branches.
Looks like I picked a bad time to plant numerous maple trees.... all young and all last summer/fall.