Marunuma Kogen is currently around 16°C, cool enough to feel seasonal but not reliably snowy. This is shoulder season: some winter hints up high, autumn everywhere else. Snow may start appearing in photos before it appears under your skis. Koyo trips win this part of the calendar.
That makes Marunuma Kogen the 9th snowiest of 16 Gunma resorts we have reviewed.
Start with the upper-mountain wind and cloud line. Here, a cold front pushing across the divide is the pattern to watch, so the useful question is how cold and calm the next window stays. With a 1400 to 2000 metre elevation band and 600 metres of vertical, the bigger vertical gives you room to move higher when the lower runs soften. A seasonal baseline around 8 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 after a cold storm only if the wind eases; if the top is socked in, wait for the next clear window.
See which resorts in Gunma are getting the best 24 hour totals and the next two days of snow.
