Juniper: 2-9
Pine: 2-10
Spruce: 2-7
Cedar: 6-9
Fir: 4-6
www.arborday.org/trees/treeguide/TreeList.cfm
These are just examples. Like with Spruce, there's colorado blue, norway, oriental, black hills, and more; and their hardiness zones aren't all the same. For Zone 10, apparently cypress, Himalayan Spruce, some junipers, some cedars will be successful.
(Sorry, this doesn't specifically answer your question, but maybe some of this information might give you insight. I know some conifers deal with drought pretty well, and socal has some Pines like Torrey Pines. I am not sure if Ponderosa Pines do. I am also not knowledge in determining dormancy.)
Maybe some of these articles will know?
www.growingbonsai.net/?s=dormant