Rule Of Thumb
There are many different opinions on this subject some say wait a year other say like wait 3 weeks. There is no rule to this. If you live in a dry climate then you do not have to wait long. If it hasn't rained after you built your deck then stain it. Most quality deck stains have been formulated to be applied soon after a deck is built.
Most PT wood is dry at to within 15%-12% of moisture content. But if the wood is left out side at a lumberyard or home improvement store then there is no telling how much moisture is in the wood. Then it is wise to wait a two weeks before staining. (No rain during that period) If you put a drop of water on a deck and it soaks up quickly into the wood then you are okay to start staining. The deck is dry enough. Or you can buy a wood moisture meter that will tell you how much moisture is in the wood. All above is depending on climate and time of year you built your deck.
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