Data sources

Snow and resort status

Resorts' own websites: Snow measuring stations of Hintertuxer Gletscher, Sölden, Kitzsteinhorn, Kaunertaler Gletscher and Pitztaler Gletscher.
Tirol Snow Card: Daily reports of the other Tirol resorts (snow depth, lifts, slopes, open/closed), as the resorts submit them to iSKI.
SalzburgerLand snow report: The same kind of report for the other Salzburg resorts, from the regional tourism board (also Planai, Dachstein Gletscher and Feuerkogel).
Kärnten snow report: The same kind of report for the Carinthian resorts, from Kärnten Werbung, the regional tourism board.
Ski Arlberg: Every lift and slope of St. Anton, Lech Zürs and Warth-Schröcken, and the snow depth of St. Anton and Lech Zürs, from the lift companies' live info.
infosnow.ch (APG|SGA): Live status of Swiss ski areas, as the lift companies publish it: every lift and slope with its type, difficulty and length, plus snow depths where the resort enters them.
SLF, WSL Institute for Snow and Avalanche Research: Measured snow depth and new snow at the stations nearest to Swiss resorts that don't report depths (automatic IMIS stations and observers' study plots), CC BY 4.0.
Open Data Hub South Tyrol: Live status of every lift and slope of the Dolomiti Superski areas, as Dolomiti Superski publishes it (CC0), and the South Tyrol snow report (lifts, slopes, snow measuring points) from the province's tourism database.
Valle d'Aosta snow bulletin: Every lift and slope of the Aosta Valley areas (and Alagna), with snow depth, from the regional tourism board.
Trentino snow bulletin: Lifts, slope km, snow depth and last snowfall of the Trentino areas, from the provincial tourism board.
Valtellina di Bormio: Every lift and slope of Bormio (with San Colombano), Santa Caterina and the Stelvio glacier, from the tourism board.
Livigno: Lift status of Livigno's three lift companies, from the tourism board.
holidayinfo.cz (Sitour CZ): Snow reports of the Czech ski areas, as the resorts enter them: every lift and slope with its type, difficulty and length, snow depth on the slopes and new snow. CzechTourism's snow report shows the same data.
Polskie Koleje Linowe (PKL): Every lift and slope of Kasprowy Wierch, Jaworzyna Krynicka, Palenica and Mosorny Groń, with snow cover, from the lift company.
Zieleniec: Every lift and slope of Zieleniec, with snow cover, from Zieleniec Sport Arena. The site refuses the fetcher's servers for now, so only the area's size is shown.
Lumiplan snow bulletins: The daily report French resorts enter in Lumiplan, from each station's bulletin (e.g. La Clusaz): snow depth, snow quality and the last snowfall at the resort's measuring points, and every lift and slope with its state. No report time.
ATEN Altitude: Alpe d'Huez's live page: every lift and slope with its state, and snow depth, snow quality and the last snowfall at its measuring points. No report time.
Size only: TMR and other Slovak, Polish and Austrian areas: Lift and slope totals and km of Jasná, Tatranská Lomnica, Štrbské Pleso, Starý Smokovec and Szczyrk (TMR's slope tables), Kotelnica Białczańska (visitmalopolska.pl), Czarna Góra, Ski Arena Szrenica, Karpacz Ski Arena and Pilsko (their own sites), and of small areas next to covered ones (Słotwiny Arena, Słotwiny, Nosal, Grapa, Beskid Sport Arena, Hauser Kaibling, Ramsau am Dachstein, Füssener Jöchle, Seefeld's Birkenlift; the operators' or tourism sites, OnTheSnow, skiresort.com). No live status yet.

Lifts and slopes

Resorts' slope maps (Intermaps): Live status of every lift and slope, with lift types and slope difficulties, for the bigger Austrian areas (the only source for most resorts in Vorarlberg, Styria, Upper and Lower Austria) and for Andermatt Sedrun Disentis, Engelberg-Titlis, the Friuli Venezia Giulia areas and Madesimo.
Resorts' slope maps (Lumiplan): Live status of every lift and slope, with lift types, slope difficulties and lengths, for the French resorts whose sites embed a Lumiplan map (e.g. Les 3 Vallées, Paradiski, Évasion Mont-Blanc), split by resort.
Resorts' own websites: The size of most ski areas (total slope km, and lift and slope totals the reports lack), and Hintertux's live open km.
OnTheSnow (skiinfo.fr) and skiresort.com: The size of ski areas whose own sites give none: lifts, slopes and km as resorts enter them on OnTheSnow, and skiresort.com's km and km by difficulty for some bigger areas.
OpenStreetMap contributors: Slope lengths for the open km of Kitzsteinhorn and Kaunertal (ODbL).

Avalanche danger

avalanche.report: Avalanche bulletin of the Euregio Tirol – South Tyrol – Trentino, for Tirol, South Tyrol and Trentino resorts.
SLF avalanche bulletin: The Swiss avalanche bulletin, for Swiss resorts.
AINEVA: The joint avalanche bulletin of the Italian regions, for Italian resorts outside South Tyrol and Trentino (those use the Euregio's).
Horská služba ČR: The Czech Mountain Rescue's avalanche bulletin, for Czech resorts in Krkonoše and Jeseníky, read from the EAWS bulletin files that avalanche.report publishes.
Lavínové stredisko HZS: The Slovak avalanche bulletin, for Jasná, Tatranská Lomnica and Štrbské Pleso, from the same EAWS files.
TOPR: The Tatra Volunteer Rescue's avalanche bulletin for the Polish Tatras, for Kasprowy Wierch, from the same EAWS files.
Météo-France: The French avalanche bulletin (bulletin d'estimation du risque d'avalanche), by massif, for French resorts in the Alps and Pyrenees, from the same EAWS files.
EAWS warning regions: Region boundaries (CC0), to find each resort's warning region.

Map

OpenStreetMap contributors: Map tiles, and the location of the villages of Italian, Czech, Slovak and Polish resorts and of Austrian ones outside the Snow Card (Nominatim). Swiss resorts are placed at their infosnow location.
Leaflet: The interactive map.
Natural Earth: Country borders on the small map at the top of the table page (public domain).
Terrain Tiles (Mapzen, on AWS Open Data): Elevation for the shaded relief on that map.

Every page in the current data

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How values are calculated, and their caveats: About the data.