Ontake is in that crisp shoulder-season phase. This is shoulder season: some winter hints up high, autumn everywhere else. A cold snap could whiten the tops, but it will not change the travel plan yet. The snow story should get more useful as November approaches. The countdown is getting less ridiculous.

That makes Ontake the 19th snowiest of 31 Nagano resorts we have reviewed.
Start with the upper-mountain wind and cloud line. The headline number only helps once you know whether a cold inland trough is the pattern to watch. With a 1680 to 2240 metre elevation band and 560 metres of vertical, the sheltered trees make modest reloads feel deeper than the raw number. A seasonal baseline around 9 metres means small clean refills matter more than waiting for a giant number. The swing variable is whether the upper lift can run with enough visibility to make the top worth using. With patrol boundaries in play, focus on how the inbounds snow will hold through the first half of the day. Chase it when 10 to 20 cm lands overnight with light to moderate wind; if gusts climb, make it a sheltered-tree day.
See which resorts in Nagano are getting the best 24 hour totals and the next two days of snow.