From Col de Balme the trail traverses an exposed alpine ridgeline toward Aiguillettes des Posettes (2,201m). This ridgeline offers spectacular panoramic views of Mont Blanc massif on one side and Swiss Valais peaks on the other. Alpine wildflowers carpet the slopes in summer, with marmots frequently spotted among the rocks.
The descent follows the crest with relatively gentle slopes. As you drop below the treeline, the terrain transitions dramatically into dense larch forest where the trail narrows and zigzags down through a series of short, steep switchbacks. Several small mountain streams are crossed via wooden footbridges.
To avoid the exposed Aiguillettes des Posettes ridge it is possible to walk down the valley to Le Tour and Montroc-Le-Plane, or take the Le Tour-Charamillion chair lift (seasonal) from just below Col de Balme which descends to Le Tour village.
The TMB trail continues down to the road at at the small settlement of Tré le Champs where Auberge la Boerne is 100m off route.
The trail now climbs through forest before emerging at the base of Aiguillette d'Argentière. Here begins the ladder section - a series of metal ladders with fixed handrails and platforms bolted to the rock face. The ladders are not continuous but interspersed with sections of normal trail. The ladders are of varying heights, with the longest being approximately 25 feet. -- After reaching Tête aux Vents (marked by a large cairn), the trail continues and includes another set of ladders, though they are generally less exposed than the first ladder section. The final climb brings you to Refuge du Lac Blanc which and serves food and drinks. Cash payment only is accepted. The lake provides exceptional views of the Mont Blanc massif. -- For those who prefer to avoid the section of ladders between Aiguillette d'Argentière and Tête aux Vents, a longer route starts on the road north of Tre-le-Champs, at the Aiguilles Rouges Nature Reserve Information centre at Col des Montets. The trail can also be picked up at the car park about 200m north of Tre-le-Champs. This will roughly add 1-3 hours of walking. -- If wanting to also miss out the section to Lac Blanc there is an alternative marked path directly to La Flégère from Tête aux Vents.
From the refuge the trail descends on a well maintained trail traversing rocky alpine terrain with occasional wooden planking over wet areas. Several small tarns dot the landscape along the way, providing additional photo opportunities with Mont Blanc reflected in their waters.
The path gradient eases and maintains a relatively gentle descent as it follows the contours of the mountainside. Throughout this stretch, the panoramic views of the Mont Blanc massif remain consistently impressive, with the Mer de Glace glacier and Aiguilles de Chamonix clearly visible across the valley.
The route is clearly marked and eventually brings you to Refuge de La Flégère (1,877m).
For those needing to descend into the valley a gondola station is located adjacent to the refuge which connect to Les Praz-de-Chamonix. Last departure at 5pm or 6pm depending on dates. Further info: https://en.chamonix.com/activities/practical-information-about-the-lifts/flegere-gondola-and-index-lift
The trail from Refuge de La Flégère initially heads southwest along the Grand Balcon Sud toward Le Brévent. The path climbs gradually through alpine terrain with dwarf vegetation and rocky outcrops, offering continuous panoramic views of the Mont Blanc massif across the Chamonix Valley.
The trail passes behind the Altitude 2000 chalet-restaurant before climbing steeply to Col du Brévent (2,368m). The gradient then eases before another climb continues to the summit of Le Brévent (2,525m), which has a panoramic terrace and water point. After descending through scree and traversing a stark mineral landscape, you'll reach Refuge de Bellachat (2,150m). This small, rustic mountain hut offers refreshments and has a terrace with direct views of Mont Blanc.
Leaving the refuge the trail quickly starts to descend and turns into a zigzag path that enters the forest. The trail crosses several small streams, including the Torrent des Lapaz, before reaching a more established forest path. The descent is consistently steep in sections but well-maintained with switchbacks to ease the gradient.
As the trail approaches Les Houches the path continues around a wildlife park and descends to a parking area. From here, the trail connects to a path leading to the Christ-Roi statue (a 25-meter tall statue reminiscent of Rio's Christ the Redeemer) before the final descent into Les Houches and the end of your remarkable Tour du Mont Blanc journey.
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