As of 10:27 GMT+9 on 12 October 2026, Shiga Kogen, Yamanouchi scores 67/100 (Great) for MTB on PeakWave.
Modelled trail surface: muddy. Check operator and rider reports below for local conditions.
Elsewhere in Nagano
Scores for Nagano are awaiting today's update, so no ranking is shown.
See every Nagano resort- Main limiter
- Trail surface
- Strongest positive
- Snow cover
PeakWave scores are planning signals, not safety clearance. Check local authorities, official bulletins and on-site conditions before you go. Read our editorial policy.
Trail surface and local reports
Surface estimate: muddy. Trails rideable in: ~1 hours These are model estimates; trail surfaces and drainage vary locally.
Trail vulnerability: Likely vulnerable.
Local trail-surface and drainage measurements are unavailable. Use the recent rider reports below and confirm openings with the park operator.
Live rider check
Shiga Kogen surface reports
Recent rider evidence can change today's decision but never changes the PeakWave score.
Model estimate
PeakWave estimate: Muddy
Recent rider reports
No recent rider reports.
Today's forecast
Local time 10:39amSession recommendations are unavailable while safety or forecast evidence is incomplete or a red flag is active.
7-day trail forecast
Working in Shiga Kogen this season?
Create a free profile and let employers in Shiga Kogen find you.
Create Profile →Frequently asked questions
How often is this page updated?
Each location is refreshed every three hours. The 7-day forecast, luck factor and packing notes are computed from the same stored update.
What is the luck factor?
A score comparing how good MTB is likely to be this week at Shiga Kogen with the version-matched historical observations available for this time of year.
Where does the data come from?
Open-Meteo, a free open weather API that blends multiple national weather services plus an archive going back decades. The same data powers many outdoor apps.
Does a high score mean the MTB is good right now?
It means the weather data suggests good riding. Trail and bike park closures, lift opening and recent rain on the trails still matter. Check the local trail report before committing.
When is the best time for MTB at Shiga Kogen?
The typical MTB season at Shiga Kogen runs from 15 June to 15 October. Within that window, the best days are the ones PeakWave's 7-day forecast scores highest; scores are refreshed every three hours.
Data sources
PeakWave uses these free data sources. Thank you to these providers.
Weather and terrain
Snow station data
- WSL Institute for Snow and Avalanche Research SLF(CC BY 4.0)
- Avalanche.report (Euregio Tyrol, South Tyrol, Trentino) weather stations and their operators(CC BY 4.0)
- GeoSphere Austria(CC BY 4.0)
- USDA Natural Resources Conservation Service, National Water and Climate Center (SNOTEL, AWDB)(Public domain (US))
- Contains information licensed under the Open Government Licence - British Columbia (BC River Forecast Centre automated snow pillows, via NRCS AWDB)
- Source : Météo-France(Licence Ouverte / Etalab 2.0)
- Contains information licensed under the Open Government Licence - Canada (Environment and Climate Change Canada)
- Source: Japan Meteorological Agency website (AMeDAS), processed by PeakWave(JMA Public Data Licence 1.0)
- NOAA Regional Climate Centers, Applied Climate Information System (ACIS); NWS Cooperative Observer Program; Community Collaborative Rain, Hail and Snow Network (CoCoRaHS)(Public domain (US))
- Snow model data from NVE seNorge (Norwegian Water Resources and Energy Directorate), NLOD
Satellite snow cover, where used
- Contains modified Copernicus Sentinel data 2026
- Sentinel-2 L2A Cloud-Optimised GeoTIFFs via Element 84 Earth Search (Registry of Open Data on AWS)
- NASA GIBS (Global Imagery Browse Services), VIIRS NOAA-20 NDSI snow cover, part of NASA ESDIS
- Copernicus Land Monitoring Service HR-WSI (European Union), when configured