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Tomamu ski resort
Tier E — Deep timing play — aim late winter

📷 Tomamu

Asia

Tomamu

Closed for the season

Season ended April 6, 2026

Conditions data updated Sat, Aug 29, 12:03 PM UTC · informational only

Closed for the season — closed April 6

Weather data is still collected for informational purposes.

Last Snowfall

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Past 24 Hours

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Past 48 Hours

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Past 10 Days

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14-Day Forecast

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Snow Depth

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🎿

Powder Days

6

2026–27 season

Updated: Aug 29, 12:03 PM•Weather at base: 596m

Overview

Tomamu is a ski resort in Asia, Japan, currently closed for the season (Season ended April 6, 2026). Conditions last updated 2026-08-29 12:03 UTC.

Resort Guide

Tomamu is a ski resort located in central Hokkaido, Japan, offering a vast ski area with diverse terrain suitable for all levels, including powder snow and tree runs. The resort features modern accommodations, a large indoor wave pool, and family-friendly facilities, creating a relaxed and welcoming atmosphere. Signature experiences include guided backcountry tours and the unique Ice Village, which appears each winter with ice bars and activities. Tomamu stands out for its blend of natural beauty, extensive amenities, and distinctive winter attractions.

Resort Info

Summit1239m
Base596m
Vertical643m
Lifts6
Runs29
Skiable Area884.6 acres
Average snowfall315 inches / 800 cm
CountryJapan
Visit Resort Website →Follow on Instagram →View Trail Map →

Season dates

Season endedApril 6, 2026
Projected openingDecember 1, 2026

Future dates are operator estimates and may change.

Ski passes

No ski pass found

Access tiers change by season — confirm benefits on the pass operator's site.

Top Après Ski

Mina Mina Beach Lounge – Known for its unique indoor beach setting and relaxed après-ski atmosphere, this lounge at Hoshino Resorts Tomamu offers cocktails and light bites with views of the wave pool, making it a popular spot to unwind after a day on the slopes.

Snow Summary

1239mECMWF Model

Updated Aug 29, 2026 at 12:03 PM

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24h
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Past 10d
14-Day Forecast
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Prev10d
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Now29
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S30
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M31
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T1
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T3
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F4
Past
Today
Forecast

Snowfall Forecast Maps

Hokkaido region

Current Conditions

Reported Sat, Aug 29, 12:03 PM UTC

Base

596m

Temp

13.4°C

Wind

3.4km/h

Snow Depth

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14-Day Forecast

0cm

Mid-Mountain

918m

Temp

--°C

Wind

4km/h

Snow Depth

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14-Day Forecast

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Summit

1239m

Temp

9.2°C

Wind

3.4km/h

Snow Depth

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14-Day Forecast

0cm

El Niño Outlook · Winter 2026-27

Tomamu El Niño rank & forecast

Tomamu ranks #438 of 488 SnowSure resorts — Tier E, −19% in strong El Niño winters.

Tier E — Deep timing play — aim late winter: Strong El Niño winters ran clearly below this resort’s own baseline (≤ −8%). Still skiable — schedule late season; one storm cycle can beat the climatology.

#438 of 488Tier E — Deep timing play — aim late winter

Strong-event signal: −19% vs this resort's 30-yr avg

In the three strongest El Niño winters on record ('97-98, '15-16, '23-24), Tomamu averaged -18% versus its own 30-year snowfall baseline. The honest read: this is the fleet's deepest timing play. The snow still comes — but in Japan the El Niño hit lands on the season's edges, not the heart of the sea-effect window. Point your winter 2026-27 trip at the mid-winter core (January to mid-February), stay flexible on dates, and watch our monthly scorecard. Analog winters: '97-98 -37%, '15-16 -6%, '23-24 -12%. One caveat that always holds: a single storm cycle can beat the climatology.

'97-98 −37%'15-16 −6%'23-24 −12%

Signal = average snowfall in the three strongest El Niño winters since 1996 ('97-98, '15-16, '23-24) vs this resort's own 30-year ERA5 baseline. n=3 — a lean, not a law. Updated monthly against measured snowfall Dec–Mar.

Full El Niño report →

Local Reports

0 reports
SnowSure™ Forecast Range

Daily Snowfall Forecast by Model

Black line = verified SnowSure™ blend (not a simple average). Weights update weekly from measured snowfall at SNOTEL stations and resort reports.

SnowSure™ blend — verified model weighting

The black line is not a simple average. For Tomamu (japan), we combine seven global weather models using weights learned from daily forecast verification — comparing each model's prediction to measured snowfall (SNOTEL, resort reports, ERA5).

  • 1.Horizon buckets: days 1–3, 4–7, and 8–14 each get separate weights — short-range skill differs from long-range.
  • 2.Regional calibration: weights come from verified error in this geography (Rockies, Alps, Japan, etc.), recalculated weekly.
  • 3.Ground truth only: we never grade a forecast against another model — only against measured snow.

Building verification history for this resort.

How we verify forecasts →

Hourly Forecast Detail

AM / PM / Night breakdown with wind and freezing level

NWP models refresh up to 4× daily · Last synced Aug 29, 12:03 PM

Hourly Forecast Detail
 
Today
14 / 50.2mm
Sun, Aug 30
14 / 71mm
Mon, Aug 31
15 / 4
Tue, Sep 1
16 / 8
Wed, Sep 2
11 / 736.4mm
Thu, Sep 3
15 / 95.9mm
PeriodAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Snow (cm)000000000000000000
Precip (mm)000.200100000011.16.119.21.822.1
Temp (°C)91389138111471214910108131410
Wind (km/h)976634364215910812126
Gusts (km/h)272317181711142011131411183024212921

14-Day Snow Forecast by Model

Summit elevation (1239m)

ECMWF
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GFS
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GEM
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JMA
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ICON
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Météo-Fr
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SnowSure™
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10-Day Forecast

Today

29

🌧️

13.6°

5.3°

11 km/h

Sun

30

🌧️

13.5°

6.5°

6 km/h

Mon

31

☁️

15.2°

4.2°

7 km/h

Tue

1

☁️

15.7°

8°

6 km/h

Wed

2

🌧️

10.7°

6.8°

11 km/h

Thu

3

🌧️

15.1°

8.7°

13 km/h

Fri

4

🌧️

11.1°

5°

14 km/h

Sat

5

🌤️

15.3°

2.9°

9 km/h

Sun

6

⛅

15.5°

5.2°

8 km/h

Mon

7

⛅

14.8°

6.2°

8 km/h

Summit elevation (1239m) • ECMWF model

Avalanche

No bulletin for this mountain

No official warning service is mapped for this resort’s country yet (v1 covers the United States, Canada and Switzerland). A bulletin may still be published locally.

SnowSure relays the official avalanche bulletin and does not issue avalanche forecasts. Read the full bulletin at the issuer’s link and make your own terrain decisions. Not a substitute for avalanche education, equipment, or local knowledge.

Season vs Historic

Updated Sat, Aug 29, 12:03 PM UTC

0cm

Season Total

This Season to Date

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vs 5-Year Avg

Off-season · 249cm full-season avg

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vs 30-Year Avg

Off-season · 279cm full-season avg

249cm

5-Yr Avg by Now

The last completed season totaled ~249 cm. That's near the 5-year average (249 cm). Versus the 30-year baseline: 11% below the 30-year average (279 cm).

Tomamu Snow History

Average annual snowfall is 296cm with an average of 131 snowfall days per season. The table below shows monthly averages across 30 seasons of archive data (modeled snowpack at mid-elevation).

Average monthly snowfall history
MonthAvg SnowfallSnowfall DaysAvg Base DepthMax Base DepthBiggest Snowfall
November33.8cm17 days6cm19cm8.7cm
December61cm25 days36cm59cm13.2cm
January53.7cm24 days69cm84cm13cm
February47.3cm23 days87cm99cm11.8cm
March58.9cm23 days96cm110cm14.7cm
April32.5cm14 days67cm94cm10.9cm
May4.6cm2 days10cm40cm3.5cm

Source: SnowSure archive · Open-Meteo ERA5 reanalysis at mid-elevation. Depth is modeled, not resort-reported.

Season at a Glance

Next season(2026-27)

Opens Dec 1, 2026

Multi-season averages will appear once SnowSure has tracked more than one full season.

ENSO seasonal analog

History · not a forecast

In 10 past El Niño winters at Tomamu, ERA5 season snowfall median was 287 cm (113 in), about 2% below this resort’s long-term median. This is a historical analog from reanalysis — not a prediction of this winter’s storm track.

Prevailing ONI

El Niño

MJJ 2026 · ANOM +1.39°C

Analog season median

287 cm

10 El Niño winters · 2% below median

All-season median

293 cm

Across 30 ERA5 seasons (2026-27)

PhaseSeasonsMedianp25–p75Recent analogs
El Niñocurrent10287 cm263 cm – 309 cm2023, 2019, 2018, 2015, 2014, 2009
La Niña12309 cm273 cm – 335 cm2022, 2021, 2020, 2017, 2011, 2010
ENSO-neutral8295 cm284 cm – 313 cm2025, 2024, 2016, 2013, 2012, 2003

Season snowfall from Open-Meteo ERA5 reanalysis (~9 km). ENSO phase from NOAA CPC Oceanic Niño Index. Relative phase differences are more trustworthy than absolute cm totals. Source: NOAA CPC Oceanic Niño Index + Open-Meteo ERA5 via SnowSure season archive.

Best Months to Visit

January

Peak Powder

February

Peak Powder

March

Good

December

Good

Note: Based on typical powder season patterns for this region.

Back to All Destinations

Frequently asked questions about Tomamu

Where is Tomamu?
Tomamu is a ski resort in Japan.
How high is Tomamu?
Tomamu runs from a base elevation of 596 m (1,955 ft) to a summit of 1,239 m (4,065 ft), giving a vertical drop of 643 m (2,110 ft).
How big is Tomamu?
Tomamu has 885 acres (358 hectares) of skiable terrain, 29 marked runs and 6 lifts.
Which ski pass covers Tomamu?
Tomamu is on the No ski pass found. Access terms such as blackout dates and day limits vary by pass tier, so check the pass operator for the current season.
When is ski season at Tomamu?
Tomamu typically operates from December to April. Exact opening and closing dates shift each year with snowfall — check the resort's current season dates before booking.
How much snow does Tomamu get in a typical season?
Tomamu averages 315 inches / 800 cm of snowfall in a typical season. Any individual season can run well above or below that.
How will El Niño affect Tomamu in winter 2026-27?
El Niño Signal Rank: #438 of 488 SnowSure resorts · Tier E · strong-event signal -18% vs its own 30-yr average. In the three strongest El Niño winters on record ('97-98, '15-16, '23-24), Tomamu averaged -18% versus its own 30-year snowfall baseline. The honest read: this is the fleet's deepest timing play. The snow still comes — but in Japan the El Niño hit lands on the season's edges, not the heart of the sea-effect window. Point your winter 2026-27 trip at the mid-winter core (January to mid-February), stay flexible on dates, and watch our monthly scorecard. Analog winters: '97-98 -37%, '15-16 -6%, '23-24 -12%. One caveat that always holds: a single storm cycle can beat the climatology.