Unfortunately, we don't know the latter exactly either, but at least we can answer the first question. Ski resort websites are not always entirely reliable when it comes to such things and, despite all the snow cannons, ski operations also depend a little on the weather, so the following list is, as every year, without guarantee. We have only included openings up to 21.11., as from the last weekend in November (28./29.11.) almost all of them are open anyway - don't rely on that either, of course, but check for yourself if in doubt!
WARNING! As always, the following applies to skiing in autumn: glaciers have holes and where there are no glaciers, there are rocks. We strongly advise against slaloming in crevasses with 30 cm of fresh snow on bare ice and similar activities and recommend preparing for the season on the piste.
October
Austria
Already open: Sölden, Kaunertal Glacier, Pitztal Glacier, Hintertux Glacier, Mölltal Glacier
Stubai Glacier, 2.10.
Kitzsteinhorn, 10.10.
KitzbĂĽhel/Kirchberg, 24.10.
Italy
Already open: Schnalstal Valley, Zermatt/Cervinia.
Still open: Stilfser Joch / Passo dello Stelvio summer ski area - open until 1.11.
Sulden am Ortler, 24.10.