Upper 20s is pretty weak for a zone 5 plant. I left a fig tree out in my 29° snowstorm last May and some of the buds and leaves burned up, but they put a bunch of new growth out.
Another possibility is they were raised in a greenhouse and the leaves are actually burnt from the UV. I put my figs and avocados out this week after being in the basement all winter under grow lights and they got scorched and are brown and dropping all leaves. They always pit new growth out after that though.