"FarmI" ask@itshall be given wrote in message
Avocado can grow in frosty areas but they need good frost protection when
young. They grow in to quite large trees eventually so need space so
sacrifical trees as protection is worth thinking about. The following
cite may help. It is about one of Australia's gardening experts (but of
the alternative variety so what she tries, and can manage to grow, often
goes against conventional wisdom). She lives in an area where it can get
down to -9C at worst but would regularly get to -4C:
http://www.jackiefrench.com/groves.html

Here is a series of pics of the garden of the author I mentioned above with
a pic of an avocado with fruit. I do know that the area she lives in gets
as cold as she claims it does.
http://www.jackiefrench.com/garden.html