Honshu: Gassan

Yamagata Prefecture, Japan · backcountry ski touring

Backcountry safety. Avalanche terrain can kill. The danger level shown here is copied from the official avalanche bulletin and can be out of date or simplified. Always read the full bulletin, carry a beacon, shovel and probe, travel with trained partners and make your own decisions. Powder Dayz does not assess snowpack or terrain. A missing or low rating does not mean the area is safe.

Official avalanche bulletin

Avalanche danger

No current rating

No current official avalanche bulletin covers this spot. We never estimate a rating. Check the avalanche center before you go.

Read the official bulletin · Japan Avalanche Network ↗

Model estimate

Current conditions

Temperature: 26 °F
Wind: 2 mph SW
Gusts: 17 mph
Visibility: 33.7 mi
Weather: Clear sky

Model estimate from Open-Meteo (CC BY 4.0) · as of Wednesday, Nov 11, 2026, 1:45 PM PT

Base depth + new snow

Snowpack

Snow depth (model estimate): 4.3 in

Model estimate from Open-Meteo (CC BY 4.0) · as of Wednesday, Nov 11, 2026, 1:45 PM PT

7-day · model estimate

Forecast

Day	Sky	High / low	Precip	Max wind
Thu Nov 12	Overcast	37 °F / 21 °F	0 in · 14%	8 mph
Fri Nov 13	Slight rain	39 °F / 33 °F	0.09 in · 91%	10 mph
Sat Nov 14	Overcast	38 °F / 32 °F	0 in · 35%	6 mph
Sun Nov 15	Light drizzle	43 °F / 34 °F	0.03 in · 45%	7 mph
Mon Nov 16	Light drizzle	36 °F / 18 °F	0.04 in · 71%	11 mph
Tue Nov 17	Slight rain showers	32 °F / 17 °F	0.17 in · 16%	7 mph
Wed Nov 18	Moderate rain showers	43 °F / 26 °F	1.64 in · 96%	18 mph

Forecast is a model estimate from Open-Meteo (CC BY 4.0) · as of Wednesday, Nov 11, 2026, 1:45 PM PT · updated once a day

About this spot

Location

Region: Yamagata Prefecture
Country: Japan
Coordinates: 38.5487, 140.0268
Source: Well-known ski-touring zone; location from OpenStreetMap