Be sure you've spend some time there in July and August beforehand. That's a radical chance and it's important to realize how radical it is, if you can ride "all year" in this extreme environment, there's almost nowhere that is not "year-round" riding if you have the gear and the bike. There are lots of trail options, if you want to ride a short-travel 29er, there's a good deal of stuff in AZ where that works fine. Same with long travel. Hardtail? You'll see a few, but that's more like bike-packing or some of the raciest-racers that can stand the punishment.