Juniperus rigida are always repotted almost last here. The needle juniper is on the tail end of our repotting season (early Spring) as follows:
Pseudocydonia - Beech - Ume - most other deciduous (as buds pop) - Shimpaku and most other conifers - Chamaecyparis and Cryptomeria (after leaves green up) - Juniperus rigida (as first buds swell)
- Gardenias and Camellias - Tropicals.
They do not like to have their roots disturbed when it's cold (that is true for us in Osaka). Many needle junipers have died from repotting too early; maybe just feeble looking at first, but by mid-summer, toast.
Sounds like I need to watch Boon's DVD's..... It's good to have insight into the quirks of plants in your climate zone. Nashville is anything but
like San Francisco though