Jungle Cruise doesn't get a holiday overlay anymore. Haunted Mansion is the first to get its overlay removed, so it usually closes right after the holiday season ends. The last day of the holiday season this year is January 6. Small World begins its holiday overlay removal once Haunted Mansion returns. I have seen IASW holiday version during the Martin Luther King weekend before, so I know that one can go down pretty late. The water rides Grizzly and Splash usually get their refurbs anytime from January to April. The exact dates tend to vary probably based on how much work needs to get done and which other rides are also being worked on. That covers the usual winter season refurbs, but, of course, anything could go down at any time so there's no way to know exactly what Disney considers due for a refurb until they post it on their calendar which is often only a few weeks before the scheduled dates.