I am in zone 8b Georgia. When should I repot small maple bonsai? The Japanese maples I have in my yard always push out leafbefore the last couple freezes.
I do have an unheated garage I can move them to.
You can repot now if you can protect it from freezing, or to be safe <40f. Or wait as late as possible just before the buds are opening. I've repotted one already and shuffle it in the garage if needed.