It may be kiln dry. Either way it should be stained, sealed as soon as its ready to accept stain. Splash some water on it and wait 15 mins. If the water has absorbed into the wood then its ready to accept stain. It is a fact that the longer you wait you are actually doing more damage its exposed to UV and the elements promoting mold, mildew, drying, shrinking,premature wood degradation and graying, shrinking and swelling will cause the wood to split and warp. Even though it is new wood you still need to clean it properly first. I like using Wolman Deck Brite. Cleaning new wood first removes invisible traces of wax, film, mill glazing, mold, mildew and dirt. You will also be opening up the woods pors allowing moisture to escape. Check the wood with a moisture meter too, according to the manufacture specs of the product you are using.