Staffordshire,
United Kingdom 
When is the best time to move a young Robinia tree?
9 Oct, 2010
Answers
Note that any piece of root you leave behind will grow into a new tree--maybe not the same kind,if it was grafted.
9 Oct, 2010
The general rule is when it's dormant, so as soon as it has lost its leaves. Don't if the soil is sodden or frozen, though!
I hope you succeed with it.
9 Oct, 2010