Hi,
For all trees, if in container, you can plant them when you want as long as the dirt is not frozen and rock solid ... of course. You could still plant in the winter with snow, but then have someone make a video of you in action. I'm sure there is a prize for such activities like "Best Fool of the year" or something like that ...
For all trees, you need to water them much more during the first two years after plantation.
Then, you'll need to water your trees if your water table is low and there is no rain for some time. You can't escape those duties or be prepared for stunted and slooooooow growth.
Planting now at Fall time as long as the summer heat wave is behind you at your location is the best. Spring time planting is good too .
Leaving the trees in container they could freeze solid or get bone dry if you forget to water them during the winter.
Lazy as I am, I would and do plant them asap and keep on watering them until frost sets in .
As for deers, antler rubbing is one of their preferred activity and this goes on any trunk or post, so you should plan for a cage to protect your trees .
I don't have deers... But moles and voles keep me busy.If you want it, fight for it !