Sun Valley has announced their early season packages:
$229 ppdo, 4 nights lodging (at Sun Valley Lodge or Inn) and 3 days lifts over Thanksgiving
$79 ppdo, lodging and lift ticket until Dec. 21. This is a good deal.
Conditions for Thanksgiving are as usually as follows:
Normal (70%): Upper College, then Flying Squirrel to Warms Springs base or Mid River Run to River Run Base plus Dollar Mountain, all on man made snow.
Worst (20%): Lower River only or Closed. Worst year was opening top to bottom on Dec 10.
Best (10%): Same as normal, plus Roundhouse Slope and Lower Canyon, Warm Springs top to bottom within a few days or a week. This was last year.
Between Thanksgiving and Christmas, expect pretty much all the Snowmaking runs to open, plus a few of the others, but probably not Bowls. Seattle Ridge normally opens the week before Christmas Week.