Frost (white ice crystals) is created when the air temperature drops below freezing
resulting of water vapor in the ( just previously warm) air condensation, freezing
on such surfaces as the ground or leaves of a plant.
Frost is soon melted and the moisture dried by the morning (somewhat hot) sun.
However, frost damages plants because the water
inside the cells of a plant freezes and breaks the cell walls. That part of the plant
will die (unless hardy enough). Figs do survive this well.
Currently, all my outside figs were hit by the recent hard NJ frost mentioned by
Herman. All the lush green fig leaves suddenly turned into a dark green mush and
should/will soon fall off. This is OK; the figs will go into a normal dormancy.
Above 20*F (rule-of-thumb), there should be no above ground fig damage
(wood/tips/buds). It has also been touted, that underground fig parts (roots)
may can withstand 10 - 5 *F, ready to spout new shoots, next spring if necessary .
P.S. Water is the ONLY thing I know of that expands just before solidifying.
Others contact (get smaller/denser). Water is quite unique for life here on our
good Earth. Think of the ponds/lakes with frozen (floating, lighter) TOP ice,
thus protecting/insulating all the rest of the water and live (possible starter)
creatures underneath, AMAZING indeed....
George (NJ).