50 weeks out. Every Sunday morning just past 3:00 AM EST (midnight PST) they release the next week of availability. So this Sunday morning they'll release availability for the nights of Sunday July 9, 2017 through Saturday July 15, 2017. And yes, as Mr. Vker stated, sometimes award availability is delayed.

When I was in Hawaii, I booked Sydney Marriott at 10:06 PM on January 10, 2010 for a 5 night New Years stay Dec 28, 2010-Jan 2, 2011. We got award nights for two of our party and really low rates for the other two rooms. Sydney Marriott discovered the rate discrepancy a couple weeks later and upped the price from $269 to $599 AUD and changed the cancellation terms. Our reservations were unaffected. I've checked NYE rates again at 50 weeks out since then but they haven't let that happen again.