So I have a stay at the end of the year (Dec 27-Jan 4) that I'm using points for. I understand that point/redemption stays count toward elite status (good), but how will nights count when my stay goes between calendar 2016/17?
Will the nights of Jan 1-4 count for my 2016 elite credit? If it counts, I'll just barely trip back over the Platinum threshold, but without those nights, I'll have just missed and get to carry over a big chunk of nights (which I guess isn't a bad thing).
I don't think the nights in January will count for 2016. My guess is the December ones will. Perhaps someone who has stayed over a similar period in the past can comment.
As for the last part of your post, if you miss renewing your Platinum status and are dropped to Gold, you will not carry over any nights. Note the 4th bullet point on "Key Information" on the link below regarding rollover nights.
It states "If a member downgrades to a lower status (e.g., Plat to Gold, Gold to Silver) there would be no rollover nights."
Sometimes Marriott will extend your status if you come close to the needed number to renew. How that is decided, I don't know. One other possibility would be to "buy back" your status in 2017. In past years, the cost has been 40,000 points to keep Platinum status.
Hopefully, someone can shed a bit more light on how a year end stay is credited. Just be aware that if you miss the cut off, you will not carry over a big chunk of nights.
I have a trip starting on Dec. 27th through Jan 3rd. I called Guest Services to get some verification and they told me that the 5 nights stayed in 2016 will count towards 2016 status and the 2 nights in 2017 will go to 2017. I think we need some help from NathalieF or carat to verify who is correct. If the nights in 2016 don't count towards 2016, then I'll make 2 reservations.....
The nights stayed in 2017 count towards 2017 status not 2016. I was concerned about the 5 nights that I'm staying at the end of December. I wanted to make sure that they counted in 2016 so they rollover again as elite nights in 2017!!! I have LTP but I'm always leery that Marriott will change the qualification sometime down the road or simply add another tier. So I figure 5 additional nights can't hurt...