FOR THE GARAGE:
I would think about making a rack out of 2X4's or maybe get an inexpensive wire shelf
(the sturdy kind, with the tubular legs with "Tootsie-Roll Grooves" and tapered chucks for shelf adjustment)
Keep it off the slab - minimizes bugs
If it's in your garage - I would think about sliding a mouse trap or two under it (Unless it'll create a problem for your pets).
Wood piles seem to attract a variety of critters that you probably don't want in your garage
OUTDOOR - MOISTURE-RESISTANT:
Otherwise, if you want to store it outdoors - I would think about a wood crib with shelves, open sides, and a "roof" that will keep most of the rain off of it.
Only keep two or three layers on each shelf, so that the stored wood can get air (A deep pile will collect moisture and will be problematic in your climate)
Where you are, I would use Composite Deck Wood, Cedar, or strong PVC Pipe. You can find rot-resistant, fiber-reinforced "wood crib brackets" at some home improvement stores.
Situate it in a spot where it gets some wind and preferably gets baked by the sun a bit if such a spot exists on your property that will not aggravate the neighbors.