I grew up skiing Hunter, Windham, the defunct Big Vanilla, etc. So, the caveat is that I haven't been around for early season skiing there in close to 20 years. I've always thought of Hunter as opening up the earliest (or at least having the best coverage) among the Catskill resorts right off the Thruway. Thanksgiving seems like an ambitious target barring a snowstorm, and I would think that early Dec. is more likely. That region is very hit or miss and dependent on there being consistent cold weather. Is there any way you could take the kiddos to Vermont instead?

If they've been skiing out west they're going to be royally disappointed with early season Catskills skiing. (I know, I echoed NJJohn a lot in this post....)