Gassanmori
月山森
Yuza, Yamagata · Elevation 1,647 m
Gassanmori is a 1,647 m peak in Yuza, Yamagata Prefecture, forming part of Mount Chokai’s western outer crater rim. It overlooks the Shonai Plain and is a trekking destination from the Yunodai trailhead.
Gassanmori at a glance
- Weather: The most settled day in the next 7 days is Wed, November 4: cloudy, gusts up to 9 m/s. Fri, Nov 6, Sat, Nov 7, Sun, Nov 8: strong wind (gusts up to 25 m/s).
Gassanmori weather (hourly, 14 days)
Sunrise today 06:09, sunset 16:38
| Tue, 11/3 | Wed, 11/4 | Thu, 11/5 | Fri, 11/6 | Sat, 11/7 | Sun, 11/8 | Mon, 11/9 | Tue, 11/10 | Wed, 11/11 | Thu, 11/12 | Fri, 11/13 | Sat, 11/14 | Sun, 11/15 | Mon, 11/16 | Tue, 11/17 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Japan time | 21 | 23 | 1 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 | 21 | 0 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 0 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 0 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 0 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 0 | 3 | 6 | 9 | 15 | 21 | 3 | 9 | 15 | 21 | 3 | 9 | 15 | 21 | 3 | 9 | 15 | 21 | 3 | 9 | 15 | 21 | 3 | 9 | 15 | 21 | 3 | 9 | 15 | 21 | 3 | 9 | 15 | 21 | 3 | 9 | 15 | |
| Temperature | °C | -1° | -1° | -1° | 0° | 1° | 1° | 4° | 5° | 6° | 5° | 1° | 0° | 2° | 3° | 2° | 3° | 5° | 6° | 8° | 5° | 5° | 5° | 5° | 5° | 7° | 8° | 4° | 2° | -1° | -2° | -3° | -4° | -3° | -3° | -3° | -4° | -4° | -4° | -4° | -4° | -2° | -1° | -2° | -3° | -4° | -4° | -3° | -5° | -2° | -2° | -6° | -6° | -2° | 1° | -3° | -3° | -2° | 0° | -4° | -3° | 0° | 0° | -3° | -2° | -2° | -2° | -3° | -4° | 0° | 1° | -5° | -3° | 4° | 6° | 2° | 2° | 4° | 0° | -5° | -4° | -2° | -1° |
| Precipitation | mm | 0.2 | 0.3 | 0.6 | 0.7 | 0.2 | 0.3 | 3.9 | 5 | 1.3 | 1.6 | 2.1 | 7 | 10 | 4.3 | 5 | 2.3 | 3.7 | 4.3 | 2.7 | 2.3 | 1.8 | 2.5 | 1.1 | 1.1 | 1.2 | 1.2 | 1.4 | 1.3 | 1.3 | 0.2 | 0.2 | 0.2 | 1.1 | 5 | 13 | 2.9 | 0.4 | 0.6 | 0.3 | 0.1 | 0.5 | 0.3 | 14 | 0.8 | 1.0 | 0.2 | 2.3 | 7 | 4.1 | 6 | 2.7 | 0.2 | 0.3 | 0.3 | ||||||||||||||||||||||||||||
| New snow | cm | – | – | 0.4 | 0.9 | 1.1 | 1.8 | 0.8 | 0.7 | 0.7 | 0.6 | 0.6 | 0.5 | 0.6 | <.1 | <.1 | 0.1 | 0.3 | 1.2 | 2.3 | 0.6 | <.1 | <.1 | <.1 | 0.4 | 0.1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Snow depth | cm | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | <1 | <1 | <1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 3 | 2 | 1 | <1 | <1 | <1 | <1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wind | m/s | 2 | 2 | 2 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 2 | 2 | 3 | 3 | 2 | 2 | 2 | 4 | 4 | 1 | 1 | 2 | 2 | 2 | 3 | 7 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 7 | 8 | 7 | 4 | 3 | 3 | 3 | 1 | 2 | 2 | 2 | 1 | 2 | 4 | 4 | 3 | 1 | 3 | 1 | 3 | 4 | 3 | 0 | 1 | 4 | 4 | 3 | 1 | 3 | 2 | 0 | 0 | 1 | 2 | 1 | 1 | 2 | 5 | 5 | 3 | 2 | 2 |
| Wind gusts | m/s | 9 | 7 | 7 | 9 | 10 | 9 | 7 | 8 | 7 | 6 | 4 | 7 | 10 | 10 | 9 | 9 | 8 | 13 | 15 | 7 | 6 | 7 | 7 | 7 | 11 | 20 | 20 | 15 | 16 | 17 | 17 | 18 | 20 | 25 | 25 | 24 | 22 | 20 | 19 | 19 | 19 | 22 | 22 | 18 | 13 | 10 | 9 | 8 | 7 | 8 | 7 | 6 | 5 | 11 | 16 | 15 | 8 | 11 | 9 | 8 | 11 | 11 | 10 | 6 | 11 | 14 | 13 | 8 | 9 | 10 | 6 | 3 | 5 | 8 | 8 | 7 | 6 | 16 | 16 | 14 | 9 | 8 |
| Wind dir. | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | |
Huts, campsites and lodging near Gassanmori
Mountain huts
- 万助小屋 unstaffed · sleeps 30
- Takinokoya 2026: open June 22–October 12 · reservation required · sleeps 20
- 御浜小屋 2026: open July 3–August 30 · reservation required · sleeps 20
- 御室小屋 2026: open July 3–August 30 · reservation required · sleeps 50
- 鶴間池小屋 unstaffed · sleeps 10
Lodging
- 大平山荘
Gassanmori facts
- Elevation
- 1,647 m
- Location
- Yuza, Yamagata
39.081915, 140.023659 - National Park
- 磐梯朝日国立公園
- Volcano
- Active volcano (鳥海山)
- Website
- www.pref.yamagata.jp (PDF)
- Trail Map
- www.town.yuza.yamagata.jp (PDF)