Tour du Mont Blanc conditions

Last updated . Satellite imagery from 30 October 2026 to 4 November 2026.

Tour du Mont Blanc: 82% snow-free as of 4 November 2026; snow on Col du Bonhomme, Col des Fours and Col de la Seigne and 2 more cols.

  • 82% of the line snow-free
  • 26.8 km still under snow
  • Snow line: 2,050 m
  • No change on last week.

The Tour du Mont Blanc usually opens mid-June, once the high cols melt out and the huts open.

This year the line was first 95% snow-free on 4 July 2026, and autumn snow returned by 22 October 2026.

The latest satellite reading, from 4 November 2026, shows 82% snow-free.

Sentinel-2 satellite imagery from 30 October – 4 November 2026 shows 82% of the Tour du Mont Blanc line clear of snow, with about 27 km still under snow.

That is little change from the week before.

The snow line sits at about 2,050 m.

Snow remains on stages 2, 3, 4, 5, 6, 9 and 10; the rest of the route is clear or nearly clear.

Less snow than the same week in 2025, when the route was 56% snow-free.

What it means: Expect continuous snow from about 2,050 m. Micro-spikes and poles are recommended above that height, and an ice axe on steep north-facing traverses.

Cols

ColHeightStageSnow
Col de Voza1,655 m1Clear
Col du Bonhomme2,329 m2Under snow
Col des Fours2,665 m3Under snow
Col de la Seigne2,516 m3Under snow
Grand col Ferret2,537 m6Under snow
Col du Brévent2,368 m10Under snow

Stage by stage

StageSnow-freeUnder snowLowest snow
1. Les Houches to Les Contamines100%——
2. Les Contamines to Croix du Bonhomme68%3.2 km2,050 m
3. Croix du Bonhomme to Val Veny59%5.8 km2,250 m
4. Val Veny to Montagne de la Saxe79%3.6 km2,000 m
5. Montagne de la Saxe to Val Ferret72%4.6 km2,200 m
6. Italian Val Ferret to Swiss Val Ferret79%2.4 km2,300 m
7. La Fouly to Champex100%——
8. Champex to Trient100%——
9. Trient to Lac Blanc82%3 km2,050 m
10. Lac Blanc to Les Houches77%4.2 km2,200 m

Season by season

YearFirst 95% snow-freeAutumn snow backBest reading
20264 July22 October100% snow-free
202522 June27 September100% snow-free

Update log

  1. : 82% snow-free, snow line about 2,050 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  2. : 82% snow-free, snow line about 2,050 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  3. : 50% snow-free, snow line about 1,000 m. Snow on Col de Voza, Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  4. : 100% snow-free. Snow on Col des Fours.
  5. : 100% snow-free.
  6. : 100% snow-free.
  7. : 100% snow-free.
  8. : 100% snow-free.
  9. : 100% snow-free.
  10. : 100% snow-free.
  11. : 100% snow-free.
  12. : 100% snow-free.
  13. : 100% snow-free.
  14. : 100% snow-free.
  15. : 100% snow-free.
  16. : 100% snow-free.
  17. : 100% snow-free.
  18. : 99% snow-free. Snow on Col des Fours.
  19. : 98% snow-free. Snow on Col des Fours, Col de la Seigne, Col du Brévent.
  20. : 94% snow-free, snow line about 2,450 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  21. : 88% snow-free, snow line about 2,200 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  22. : 86% snow-free, snow line about 2,100 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  23. : 80% snow-free, snow line about 2,000 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret.
  24. : 70% snow-free, snow line about 1,650 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  25. : 63% snow-free, snow line about 1,450 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  26. : 51% snow-free, snow line about 1,150 m. Snow on Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  27. : 47% snow-free, snow line about 1,000 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  28. : 56% snow-free, snow line about 1,350 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  29. : 39% snow-free, snow line about 1,000 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  30. : 100% snow-free.
  31. : 100% snow-free.
  32. : 100% snow-free.
  33. : 78% snow-free, snow line about 2,050 m. Snow on Col de la Seigne, Grand col Ferret.
  34. : 79% snow-free, snow line about 1,950 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret.
  35. : 100% snow-free.
  36. : 100% snow-free.
  37. : 100% snow-free.
  38. : 100% snow-free.
  39. : 100% snow-free.
  40. : 100% snow-free.
  41. : 100% snow-free.
  42. : 100% snow-free.
  43. : 100% snow-free.
  44. : 100% snow-free. Snow on Col des Fours.
  45. : 99% snow-free. Snow on Col du Bonhomme, Col des Fours.
  46. : 99% snow-free. Snow on Col des Fours, Col du Brévent.
  47. : 99% snow-free. Snow on Col des Fours, Col du Brévent.
  48. : 96% snow-free, snow line about 2,500 m. Snow on Col des Fours, Col de la Seigne, Col du Brévent.
  49. : 85% snow-free, snow line about 2,100 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  50. : 72% snow-free, snow line about 1,700 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  51. : 71% snow-free, snow line about 1,700 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  52. : 63% snow-free, snow line about 1,450 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  53. : 61% snow-free, snow line about 1,450 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.
  54. : 51% snow-free, snow line about 1,100 m. Snow on Col du Bonhomme, Col des Fours, Col de la Seigne, Grand col Ferret, Col du Brévent.

How this is measured

The route is sampled every 200 m along the classic stages. Each point uses its most recent cloud-free satellite view from the 10 days before the update.

A point counts as snow when Sentinel-2 classifies it as snow or its snow index (NDSI) is high. Cloud, shadow and no-data pixels are left out.

Imagery: Copernicus Sentinel-2 L2A (Earth Search STAC), 20 m. Elevation: Mapbox Terrain-DEM v1 (zoom 12).

Satellite snow cover is a planning aid, not a safety verdict. It cannot see snow under trees or thin new snow, and it says nothing about avalanche danger, cornices or ice. Check with huts, guides and local bulletins before you go.

Tour du Mont Blanc route guide · Conditions on every route