They should move in 4-5" of snow.

However: When the snow gets deep turkeys do not like to walk a lot. There have been instances written where they have starved to death by refusing to fly down to fed when corn was been place on the under their roosting trees.

Deep snow can caused "Ice Balling" on their tails and with the extra weight they are unable to run, fly, roost in trees and often become victims of predictors....

Hard crusty snow will often take a tole on turkeys, since their ability to scratch for food is limited....