Not sure if the annual (2018) race prep thread has been started (I didn't look), but this could be it if not.
Start is always the 2nd Friday of June, so June 8th this year. Supposed to be a heavy snow year in the Montana and lower BC rockies this winter. I'm training as if I'll be at the start line, but not if there will be a super heavy snow year. I can be flexible on my start time and either save it for 2019 or do an ITT later in 2018.
edit: here is the link to the 2018 prep/training thread:
http://www.bikepacking.net/forum/ultra-racing/tour-divide-2018-race-preparation/