I contacted the Mt Adams ranger station last week regarding winter climbing of Admas, and there is a southern route that is open. The closed/fire damage area does include the Cold Springs Campground. But there is a route east of Cold Springs that runs parallel to the reservation and lava bed. Here is what I received from the ranger on Oct 24th.
The south side of Mount Adams will no doubt be closed for the entire winter and even into spring. This area has not been made safe for entry, and access to do has snow . However the winter climbing route is open from the East side of the Aiken Lava bed off the 150 road. Please call our front desk at 509-395-3400 M-F 0800 – 1630 for more information.