I just moved into a new (well, old) house. The previous owners put in a deck probably about 1 year ago. It's treated lumber, but they hadn't yet stained it. Winter is approaching quickly here in upstate NY, so I'd like to wait until Spring if I can. But I'm concerned that letting it sit unstained through the winter will have long term effects on the wood. So, can I wait? or should I do it?
It'll be fine. You should always wait at least one year anyways to make sure the wood is fully dried. I think I waited almost 3 years before I stained parts of my deck, with no detrimental effects.