What Is Japow? Japan's Powder Snow, Counted Daily at Every Resort

Japow right now

No region has had its first powder day yet this season. Updates daily, around 1 pm Japan time.

1. Hokkaido

   Waiting for the first powder day

   Typically first powder

   around Dec 2

   Last season (2025–26)

   9 powder days at the typical resort

   Japow-grade share, last season

   60%

2. Tohoku

   Waiting for the first powder day

   Typically first powder

   around Dec 23

   Last season (2025–26)

   10 powder days at the typical resort

   Japow-grade share, last season

   14%

3. Kanto

   Waiting for the first powder day

   Typically first powder

   around Dec 24

   Last season (2025–26)

   4 powder days at the typical resort

   Japow-grade share, last season

   70%

4. Chubu

   Waiting for the first powder day

   Typically first powder

   around Dec 14

   Last season (2025–26)

   14 powder days at the typical resort

   Japow-grade share, last season

   23%

A powder day is 20 cm or more of new snow in one day. The typical resort is the middle one of each region's resorts. Japow-grade share is the part of the Dec–Feb snow light enough to count as japow, read at the region's valley weather stations, which run warmer than the slopes.

What is japow?

Japow is the deep, light powder that falls on Japan’s mountains when cold Siberian air picks up moisture over the Sea of Japan and drops it as snow on the coastal ranges. Last season the typical Hokkaido resort logged 9 powder days, and the typical Chubu resort logged 13, across the 49 resorts JapowDB tracks.

You’ve seen the footage: skiers chest-deep in white, boards disappearing into bottomless fluff, powder plumes trailing down untracked faces. If you’re here, you want to know whether it’s real or whether ski marketing has been overselling a fantasy.

It’s real. The rest of this article measures how often it happens and where.

The word gets used loosely. Any deep powder day in Japan gets called japow, without much clarity on how often those days happen, how cold the snow falls, or what it costs to be there when they do. This article answers those questions from JapowDB’s own record: daily snowfall at Japan’s weather stations, the depth gains resorts report each morning, and temperatures at each resort’s height.

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How is japow made?

The mechanism has four steps.

Step 1: The Siberian High. Every winter, a persistent high-pressure system over Siberia drives cold, dry continental air south and east across Asia. By the time this air reaches the Japanese coast it has traveled thousands of kilometres and is extremely cold, with very little moisture.

Step 2: Sea of Japan pickup. The Sea of Japan is relatively warm in winter compared to the air mass passing over it. As the cold Siberian air crosses the open water, it absorbs moisture and a small amount of heat from the surface. The air stays cold, but it picks up the water vapour it needs to produce precipitation.

Step 3: Orographic lift. Japan’s mountain ranges, the Hokkaido peaks and the Japanese Alps in Honshu, act as an abrupt barrier to the oncoming air. Moist air is forced upward as it hits the terrain. The rapid gain in altitude drops the temperature further, and water vapour crystallises into snow.

Step 4: Cold crystals. Because the air arriving at the mountains is still very cold, the snow forms and falls at temperatures that produce low-density, low-cohesion crystals. The result: high volume, low weight.

This cycle repeats throughout winter every time the Siberian High sends a new pulse of cold air eastward, which in a normal season is often.

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What does the snow record show?

JapowDB counts a powder day at each resort from two daily measurements: the snowfall at its nearest Japan Meteorological Agency (JMA) station, and the depth gain in the resort’s own snow report.¹ Most resorts have 12 complete seasons of resort reports, 2014–15 through 2025–26. A resort without enough resort reports is counted from its JMA station alone, over up to 26 seasons. Temperatures come from ERA5 weather data adjusted to the resort’s height.²

One nuance the season averages don’t capture: timing matters within the season. In the shoulders, early December and late February through March, Hokkaido usually delivers the coldest, lightest snow.

Siberian air is still cold during these shoulder periods, and the sea is at its warmest relative to the incoming air mass, so Hokkaido gets high-volume, very cold snowfall while Chubu resorts may be getting warmer, wetter storms or nothing at all.

The Chubu resorts with the highest counts get most of their powder days in the core of winter, January through mid-February, the window Japan’s ski community calls Japanuary. Outside that window, Hokkaido’s cold air counts for more. Choose Chubu for frequency in peak season, and choose Hokkaido if you’re travelling in early or late winter.

Powder day = 20cm or more of new snow in a day.³ Powder days are averaged over each complete season from Nov 15 to Apr 15. This season’s live count starts on Nov 1, two weeks before that window opens. Japow-grade share is read at each resort’s valley weather station; temperature on snowfall days is ERA5 at resort height.

Four things the data shows that anecdote doesn’t:

Snowfall temperature depends on latitude and height. Hokkaido’s resorts average snowfall-day temperatures between −6.1°C and −9.0°C. Chubu spans −2.2°C to −8.4°C: the high Shiga Kogen resorts sit with Hokkaido, while the low Niigata resorts around Yuzawa get much of their snow near freezing. Most of the fleet still falls in the range that produces light snow.

Powder day frequency varies even more than temperature does. GALA Yuzawa averages 26.2 powder days a season and Karuizawa Prince 3.5. Niseko United averages 18.1. Hoshino Resorts Tomamu has the coldest snowfall in the record at −9.0°C and only 4.8 powder days a season. The coldest snow is rarely the most frequent snow.

Quality and quantity are different axes, and you feel the difference underfoot. Hokkaido’s Niseko and Kiroro get the coldest-falling snow among the big names, at −8.1°C and −8.0°C. At those temperatures crystals form with almost no bonding: snow so dry it barely compresses, pours off your jacket like flour, and doesn’t settle into slab between storms. You float through it rather than punch through it.

Chubu’s Myoko Suginohara and Nozawa Onsen fall at −5.6°C and −3.7°C. That snow carries a little more water, so it stacks higher, bonds a little between storms, and feels more supportive than Hokkaido’s lightest days. In exchange, Myoko averages 21.3 powder days and Nozawa 22.3, a few more deep mornings each season than Niseko’s 18.1.

Japow-grade share reads the snow at the valley station, and the valley runs warmer. The share is the part of each winter’s Dec–Feb snowfall that fell cold enough to count as japow. Niseko’s station at Kutchan records 70% of its snow at that grade. Myoko’s station at Sekiyama, 350m up in the valley, records 5%. Myoko gets one of the highest powder-day counts in the fleet, but its station records most of that snow falling near freezing, and the slopes above it are colder than the station.

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What does a japow day actually look like?

The data above defines the conditions. What it doesn’t convey is what happens at 7 in the morning when you pull back the curtain.

It’s 6:50 AM. You wake to a stillness you can’t quite place: no wind, no traffic, just the particular silence that has weight. You push open the lodge door and your boot sinks past your shin in the car park. Last night’s tracks are gone. The fence posts are buried. The car you parked yesterday is a smooth white mound you have to find by shape. The mountain above has added a deep layer while you slept, and before you glance at your phone you already know today is the day.

You’re dressed in four minutes. Skipping breakfast. Moving through a resort you barely recognise, familiar landmarks swallowed, everything reduced to clean planes of white and the creak of fresh load on the trees. Others are already moving the same way with the same quiet urgency, boots punching through at every step, all working out the same geometry: which face, which trees, which line hasn’t been touched yet. The record puts mornings like this at 21.3 a season at Myoko and 18.1 at Niseko.¹ Those numbers feel adequate until you’re standing inside one.

Three videos from the JapowDB index show it better than description can.

Rusutsu Resort: Salomon Freeski TV (roughly 771K views). The tree skiing segments show how a high-volume snowfall buries terrain features and creates the pillowed, untracked surface that defines the japow experience at its best.

Powder skiing in Hokkaido: Joe Dickson (roughly 249K views). Shot across multiple Hokkaido resorts during a powder week, showing what consistent snowfall looks like across several days rather than a single highlight.

Hakuba, Nagano: Jon Olsson (roughly 1.07M views). This is filmed in Chubu, in the same Sea of Japan snowbelt, roughly 800km south of Niseko. The powder conditions are identical in character.

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How does japow compare to Alps, Utah, and Canadian powder?

The claim “Japan has the driest, lightest snow on the planet” appears across competitor articles without a source. Here’s what can actually be backed.

University of British Columbia’s atmospheric science curriculum (ATSC113) documents the relationship between air temperature, crystal formation, and newly fallen snow density.⁴ The core relationship: colder air produces smaller, less-bonded crystals and lower water content in deposited snow. Below roughly −5°C at snowfall time, fresh snow density drops into the low end of the measured range.

Japan’s record fits this framework, with one exception. Hokkaido’s resorts average snowfall-day temperatures of −6.1°C to −9.0°C at resort height, at the cold end of the powder spectrum. Chubu spans −2.2°C to −8.4°C, so its high resorts match Hokkaido and its lowest get wetter snow.

Region	Avg snowfall temp	Annual volume (top resorts)	Powder character
Japan (Hokkaido)	−6°C to −9°C	1,000–2,000cm	Driest, lowest cohesion
Japan (Chubu)	−2°C to −8°C	800–1,500cm	Widest range, most powder days
European Alps	−1°C to −3°C	400–800cm	Denser, higher water content
Utah / Colorado	−5°C to −8°C	500–600cm	Dry, but lower volume than Japan
Canada (BC/Alberta interior)	−5°C to −7°C	800–1,500cm	Closest to Japan in both dimensions

For comparison: the European Alps receive Atlantic maritime air masses. By the time precipitation falls over the Alpine arc, temperatures during snowfall events are typically warmer and more variable than Japan’s Siberian air delivers.

The snow tends toward higher water content and a denser pack. On the mountain, Alpine powder compresses under weight instead of dispersing around you, takes more effort to push through, and settles faster into a firmer slab between storms.

A 30cm Alpine powder day and a 30cm Japan powder day are different rides. The Alps day is heavier, stickier, and less forgiving of imperfect technique. That is what warmer snowfall temperatures produce.

Utah and Colorado produce famously dry snow, but their annual snowfall totals are modest compared to Japan’s Sea of Japan snowbelt, which draws moisture from a much larger body of warm water. Canada’s interior ranges, British Columbia and Alberta, come closest to Japan’s combination of cold snowfall and high annual volume.

Japan’s combination is snowfall cold enough for light snow at most resorts, backed by a moisture source large and warm enough to produce deep accumulations through the whole winter. That’s the combination the data supports.

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What don’t powder skiing articles tell you about japow?

Every article about japow is written to sell you something. Here are five things that don’t appear in ski resort marketing.

1. Heavy snowfall means poor visibility

The same overnight event that deposits around 40cm of fresh snow comes with flat light, restricted sightlines, and wind-driven snow that makes the upper mountain significantly harder to navigate than a groomed day. A japow day is not automatically a bluebird day. Frequently it is grey, cold, and windy. The powder is just as good, but the weather changes what terrain is practical. Tree skiing becomes more attractive precisely because the trees provide contrast and shelter. Open bowls in a storm are different.

2. Popular resorts get very crowded on powder mornings

Niseko on a powder morning is not the untracked wilderness shown in videos shot at 7am. International visitor numbers at Japan’s top powder resorts have grown substantially across the 2020s. Lift queues of 30 minutes or more are common on powder days at the best-known resorts. Niseko averages 18.1 powder days a season, and a large international crowd reads the same forecasts, so each of those days is competed for.

3. Avalanche control closes terrain temporarily

After major snowfall events, ski patrol conducts avalanche control sweeps and closes significant terrain while safety work is completed. The best powder days, around 40–50cm overnight, are also the days when the most terrain is initially closed. This is standard and correct safety protocol. But it means that on the biggest powder days, out-of-bounds terrain, gates, and sometimes on-piste runs are unavailable until patrol signs off. First tracks come later than the forecast suggested.

4. Not every season delivers

The record includes warm winters, thin snowfall years, and seasons where powder days were rare. Niseko’s 18.1 powder days a season is an average over 12 seasons, and some seasons produce far fewer. In JapowDB’s record, La Niña winters bring more snow than El Niño winters in Tohoku and Chubu, while Hokkaido shows no measurable difference. Planning an expensive once-in-several-years trip around guaranteed japow carries real risk.

5. Getting to the highest-frequency resorts takes effort

Several of the resorts with the highest powder day counts, among them Myoko, Nozawa and the Yuzawa resorts, are far from major international airports. A standard routing to Myoko from Tokyo: Shinkansen to Joetsu-Myoko, then shuttle or taxi to the resort. Total travel time from central Tokyo: roughly 3 hours. Doing this mid-trip when a powder window opens requires flexibility, pre-booked accommodation, and willingness to move.

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Closing

Japow is real and measurable, and some resorts get far more of it than others. The physics, cold Siberian air picking up Sea of Japan moisture and rising over the mountains, plays out along the whole western side of Japan, from Chubu to Hokkaido. The most useful number to carry away: at most of the 49 resorts in the record, snow falls well below freezing at resort height. Frequency is where the surprises are. GALA Yuzawa leads at 26.2 powder days a season, Nozawa Onsen and Akakura Kanko follow at 22.3, and Niseko’s 18.1 is good, though far from the daily occurrence the footage implies.

If you’re planning a trip, the next questions are which resort fits your dates and what this season looks like on the ground. The block at the top of this page answers the second one daily. Our top pick is Myoko Suginohara: 21.3 powder days a season, the fifth-highest count in the record, about three hours from Tokyo.

For deeper reading, the resort pages carry live snow reports and the full daily record this article draws from, broken down storm by storm.

• Myoko Suginohara snow report & map
• Nozawa Onsen snow report & map
• Niseko United snow report & map

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Footnotes

1. JapowDB counts a powder day when a day’s new snow reaches 20cm, taking the larger of the JMA station’s snowfall and the resort report’s depth gain. Averages cover Nov 15 to Apr 15 of each complete season: 2014–15 through 2025–26 for most resorts, and up to 26 seasons for a resort counted from its JMA station alone. Data through April 2026. This season’s live counts read a different resort-report source than the historical seasons, so the method is close but not identical. The typical first powder day uses each resort’s full record; before 2014–15 that record has no resort reports, which pushes early-season dates later. ↩ ↩²

2. Temperatures are ERA5 reanalysis, adjusted to each resort’s height. Snowfall and Japow-grade share come from JMA stations, which usually sit in valley towns well below the slopes. A station’s Japow-grade share therefore reads warmer than the snow on the mountain above it. ↩

3. The 20cm threshold is a widely used benchmark in Japan’s ski community and resort forecast services, the point at which new snow reliably changes conditions on the mountain. JapowDB applies it the same way at every resort. ↩

4. University of British Columbia, ATSC113: Density of Newly-Fallen Snow. UBC Department of Earth, Ocean and Atmospheric Sciences. ↩