I've been wondering whether everyone reading this thread realizes the "100 Mile Wilderness" ordinarily means the portion of the AT between Monson and Abol Bridge.
Not far north of Abol Bridge, the AT enters Baxter State Park, open only for day-use in winter except to well-prepared groups who must meet strict requirements before being granted permission. Campgrounds open before the trails on Katahdin, which are not likely to open until sometime in June.