Atlas Cedar, anybody in Zone 9 or higher have root reduction experience?

[Vince Sartain]

I have a fairly large (2" base) Atlas Cedar that is in a 5 gal nursery pot that is really heathy and I am wanting to reduce the rootball and get it in a much shallower pot. I am looking for preferably zone 9 or higher experienced advice as to when is the best time to pull this off.

 

[Wires_Guy_wires]

Not sure what zone I'm in, but my cedars did best when repotted just before spring. Like a week or two before growth starts.
Cedars can be picky about root work and don't tolerate root pruning as much compared to other conifers, so please consider setting up a multi year reduction plan.