Chateraise Ski Valley Koumi is a ski area in Nagano, Japan, on slopes between roughly 1,380 and 1,764 m. Its mapped area is about 2.0 km across, with 9 marked runs and 5 lifts (about 5.4 km of piste in all).
Over the last twelve winters the ERA5 weather model gives it 136 cm of snowfall a season, 338th of the 397 ski areas we measure in Japan. It swings a lot from year to year: the biggest winter, 2023/24 (176 cm), brought more than twice as much as the leanest, 2025/26 (83 cm). March is usually the snowiest month, with about 49 cm. Snowfall days average −3.6 °C at mid-mountain, and its snow-quality score ranks 276th of 397 in Japan.
Snow depth and the seven-day outlook appear here once snow starts to fall. Until then, the long-run record comes first.
Elevation range is estimated by sampling points across the ski area.
How much snow it gets
Measured by us across 3,069 ski areas by one identical method. These are not the resort’s own published figures.
The tick marks the median across every Japanese ski area we measure. All four bars run the same way — longer is better.
The quality score deliberately excludes how much snow falls — it uses temperature, frequency, rain and wind. Snowing a lot and snowing well are different things.
Compared with what is nearby
Within 50 km straight line. Measured the same way, so the ranks compare directly. Ski areas a few kilometres apart share a weather grid cell and can return the same figure.
| Ski area | Distance | Seasonal snowfall | World rank |
|---|---|---|---|
| Yachiho Kōgen Ski Resort | 3.1 km | 136 cm | 1860 |
| Pilatus Tateshina Snow Resort | 8.6 km | 143 cm | 1761 |
| Sun Meadows Kiyosato Ski Area | 12 km | 113 cm | 2196 |
| Tateshina Tokyu Ski Area | 13 km | 136 cm | 1860 |
| Shirakaba 2 in 1 | 14 km | 133 cm | 1909 |
When it falls, and how winters differ
Month by month
Month by month, the most snow falls in March. March brings as much as January, or more. In amount, March brings 49 cm, about the same as the median of 46 cm.
Winter by winter
Across the 12 winters measured, the average is 136 cm, and 6 of them fell short of it. The leanest was 2025/26 with 83 cm; the biggest was 2023/24 with 176 cm (2.1 times as much).
Snowfall each winter (December–March total). The dashed line is the average; the numbers mark the leanest and the biggest winter.
Runs and lifts
Counted from the runs and lifts drawn on OpenStreetMap, within the boundary of the ski area. These are not the resort’s own published figures.
Run map
The shape of the mountain
Which way the slopes face
96% of the vertical on the runs descends to the north or east. Those slopes get the least sun, so the snow lasts longer.
By difficulty
Lift types
- Chairlift5
See past trail maps on Skimap.org ↗
Source: OpenSkiMap (© OpenStreetMap contributors, ODbL 1.0). How finely ski areas are drawn varies by region, so treat the counts as indicative. Vertical is the difference between the highest and lowest points of the mapped runs and lifts.
Hot springs nearby, as analysed
1 hot spring sources with published analyses lie within 5 km of this ski area, nearest first (the hottest is 7.6 °C).
| Source | Distance | Temperature | pH | Type | Analysed |
|---|---|---|---|---|---|
| 稲子湯温泉 | 1.3 km | 7.6℃ cold | 4.9 mildly acidic | sulphur, carbon dioxide | 1999 |
These are analyses of hot spring sources, not a list of baths you can visit. They date from 1910 to 2005, many from decades ago, so today’s temperature and chemistry may differ. Names are as recorded in Japanese. Temperature and pH bands follow Japan’s standard for analysing hot springs.
Source: processed from the hot spring analysis data in the Geothermal Information Database (GRES-DB), Geological Survey of Japan, AIST
Worth seeing nearby
Places within 20 km of this ski area, for a day off the slopes or an evening. Chosen from those most read about on Wikipedia, favouring places with an English Wikipedia article, and listed nearest first.
| Place | Type | Distance |
|---|---|---|
| Northern Yatsugatake Volcanic Group北八ヶ岳 | Mountain | 5.9 km |
| Mount Iō硫黄岳 (八ヶ岳) | Mountain | 6.9 km |
| Southern Yatsugatake Volcanic Group八ヶ岳 | Nature | 9.8 km |
| Mount Tateshina蓼科山 | Mountain | 11.3 km |
| Nobeyama Station野辺山駅 | Landmark | 12.7 km |
| Nobeyama radio observatory野辺山宇宙電波観測所 | Landmark | 13.9 km |
Based on the Japanese Wikipedia lists of sights in each prefecture, as compiled in travel-log-data (CC BY-SA 4.0). English names from Wikidata (CC0). The content of this section is available under CC BY-SA 4.0.
Map
Where it sits relative to nearby resorts. For a piste map, see the official site.
Official piste map ↗Places to stay nearby
8 properties on Rakuten Travel lie within 3 km of this ski area, listed cheapest first.
| Property | From | Rating | Distance | Getting there |
|---|---|---|---|---|
| リゾートイン・ブローニュ | ¥4,500 | 3.95 100 reviews | 0.6 km | JR小海線 小海駅よりタクシーで15分またはバスで約25分 |
| ロッヂ八ヶ嶺 | ¥7,200 | 5.00 13 reviews | 3.1 km | 中部横断自動車道佐久穂ICより20分 中央道須玉ＩＣより６０分 |
| ペンション ラ・ルゥ | ¥8,500 | 3.50 6 reviews | 3.0 km | JR小海線 八千穂駅 車で25分 |
| フォレストリゾート 北八ヶ岳 天空の森 やちほ | ¥8,663 | 4.54 24 reviews | 2.7 km | ＪＲ 八千穂駅から車で約２０分 |
| 八千穂山荘 | ¥9,900 | 4.20 42 reviews | 3.0 km | 上信越自動車道・佐久小諸JCT→中部横断道・八千穂高原I.C経由で約45分／JR小海線八千穂駅バスまたはタクシー約20分 |
| シャトレーゼ ガトーキングダム小海 | ¥10,500 | 3.98 981 reviews | 1.7 km | 小海線小海駅からタクシーで15分または町営バスで約20分／中央自動車道 須玉ICから48ｋｍ |
| リゾート イン ボンシック | ¥12,000 | 4.47 182 reviews | 0.7 km | 上信越道→中部横断道八千穂高原ＩＣより２０分／中央自動車道須玉又は長坂ＩＣより５０分／ＪＲ小海線小海駅より車で２０分 |
| ロッジ エル・ケーナ | — | — | 3.0 km | JR小海線 八千穂駅より車で約20分、中部横断自動車道 E52 八千穂高原ICから約18分 |
Contains advertising · Property data by Rakuten Travel (Supported by Rakuten Developers)
Stay nearby
5 places within 12 km of the slopes. Most of them do not take online bookings — open the map for contact details.
Nearest: 0.9 km
Nearest first
- 小海リエックス・ホテル Hotel 0.9 km
- 稲子湯 Guest house 1.2 km
- 佐久屋 Hotel 5 km
- 立花屋 Hotel 5 km
Accommodation data: OpenStreetMap
More places to look
Guides covering Nagano
- A Historic El Niño Is Forecast. Here Is What the Last Big One Did to Japan's Snow. NOAA gives a very strong El Niño better than a 90% chance this winter. We measured every Japanese ski area across the last 12 winters: El Niño winters ran 88% of normal, and the strongest of the twelve left Japan at 63%. But Hakuba held 92% of its average that winter while Niseko fell to 57%.
- Which Famous Ski Resorts Actually Get the Most Snow? 24 Names, Measured Niseko is 526th in the world for snowfall. Zermatt is 554th, Jackson Hole 924th, Aspen 1,201st. Measured identically across 3,069 ski areas, the names everyone books and the places it actually snows turn out to be two different lists.
- How Japan's Early-Bird Lift Tickets Work: At Hakuba Happo-One, Eight of the Nine Need a Japanese ID Card Hakuba Happo-One opened early-bird sales at 10:00 on 1 October. A day costs ¥6,400 against ¥9,800 at the window, 35% off. But every ticket on the list except one needs a My Number Card and a Japanese phone app. A visitor from abroad can buy exactly one of them, at 15% off.
Updated: 8 Oct 2026, 00:52