They have over 17 trees that they've been winterizing on time for over twenty years. Very impressive.

They dig out the fig trees annually and throw them into a hole approximately 6x12x5' deep.
Then they cover with leaves, plywood and finally a very large tarp to keep water out.

October 31st, 2015 annual burial of fig trees video.
"Every year these trees need to go into the ground on November 1st".

Too much work!  More power to them, but dang!  I work HARD in my yard, garden, and orchard, but I am unwilling to bury and replant my trees year after year.  Here in my part of zone 6, I am counting on fig varieties that bear on new growth from the ground.  

When I'm working my butt off outside it is with the strategy of making less work for myself in the future.