TMB Stage 8: Champex-Lac to Trient — Bovine or Fenêtre d'Arpette?

Over breakfast at Champex-Lac, the same question surfaces at every table: "Are you going Bovine or Arpette?" It is the defining dilemma of Stage 8 on the Tour du Mont-Blanc. On one hand, the Bovine alpine pasture and its panoramas over the Rhône Valley. On the other, the Fenêtre d'Arpette at 2,665 m — scree, possible snow, a vertiginous view onto the Glacier du Trient. Two entirely different routes for the same destination: the Valaisan village of Trient.

Mountain walking guides, we lead groups along both routes regularly. The choice hinges on the weather, physical condition, and what sort of day you're after. This article lays out the two options to help you decide, with terrain data, accommodation details, and the key considerations for each variant.

The Route: Profile, Map and GPX

• Distance :↔ 15.5 km
• Dénivelé positif :↗ 729 m
• Dénivelé négatif :↘ 901 m

Stage 8 at a Glance

How to choose? If the sky is clear and your legs are still cooperating after seven days of walking, the Fenêtre d'Arpette is the most spectacular passage on the TMB. If the weather looks doubtful, your knees are complaining, or you favour a gentler rhythm, Bovine provides a lovely day with magnificent views across the Rhône plain.

The Classic Route: Bovine Alpine Pasture

The official TMB route departs Champex southwards, descending to Champex-d'en-Bas (1,359 m) before crossing the hamlet of Plan de l'Au. You then climb steadily through forest toward the Bovine pasture, on a shaded path winding between spruce trees.

The Bovine Pasture: A Balcony over the Rhône Valley

Reaching the Bovine pasture (1,975 m) marks a genuine shift. Until this point, the TMB has circled the Mont-Blanc massif in a world of glaciers, ridges, and cols. Quite suddenly, your gaze carries north-west, well beyond the massif. The Rhône Valley spreads out below — broad and deep — with Martigny and its terraced vineyards at the bottom. On a fine day, you can pick out the Dent de Morcles (2,969 m), the Grand Chavalard (2,899 m), and the first summits of the Bernese Oberland.

The Bovine refreshment hut, housed in an alpine chalet since the 1920s, serves hot drinks and straightforward fare. You will find yourself sharing benches with walkers who have no connection to the TMB, simply here to enjoy this little-known viewpoint.

From Collet de Portalo to Col de la Forclaz

Beyond Bovine, the trail crosses the Collet de Portalo (2,049 m), the high point of the classic route. The descent to the Col de la Forclaz (1,526 m) passes the Chalet de la Giète, another alpine pasture. Col de la Forclaz is a road pass with a hotel-restaurant and car park.

The descent from Col de la Forclaz to Trient takes 30 to 45 minutes along a forest path. You arrive at the village at an easy pace, between timber chalets and stone fountains.

The Variant: Fenêtre d'Arpette (2,665 m)

The Fenêtre d'Arpette is frequently described as the most demanding variant on the entire Tour du Mont-Blanc. It is also the one that offers the sharpest contrast in a single day: you pass from a pastoral valley into a mineral chaos, then swing round to face the Glacier du Trient.

The Ascent: From Relais d'Arpette to the Scree

The route departs Champex-Lac heading north-east into the Val d'Arpette. After 30 minutes of walking, you arrive at the Relais d'Arpette (1,627 m), a refuge-inn set at the forest edge. It is the last place to buy food or drink before the col.

The path follows the Val d'Arpette on good ground through larches and alpine meadows. The higher you climb, the sparser the vegetation becomes. Above 2,200 m, you enter a mineral landscape: granite blocks, loose scree, trail markings that can be indistinct. Cairns guide the way, but in poor weather or mist, route-finding becomes awkward. This is the principal reason the variant should be avoided when visibility is poor.

The Fenêtre: The Pass and Its Conditions

The Fenêtre d'Arpette (2,665 m) is not a col in the conventional sense — it is a narrow breach in a rocky ridge, a gateway between two worlds. The final stretch before the top is the most technical on the TMB. The scree is steep, the rocks move underfoot, and in early season (June, sometimes early July), snowfields obscure the passage. Without crampons or snow experience, it is wiser to turn back.

At the summit, the panorama pivots. To the west, the green, hemmed-in Val d'Arpette from which you have just climbed. To the east, the Glacier du Trient, its séracs and moraines, flanked by granite aiguilles. This is the highest point on the TMB if you take the variants. That view alone repays every metre of effort.

The Descent to Trient: Scree then Forest

The descent on the Trient side is lengthy and taxing on the knees. You lose close to 1,300 metres of elevation in fewer than 8 km. Scree yields to moraine, then a forest path through larches. You pass near the snout of the Glacier du Trient, where the retreat is startling.

Twenty or thirty years ago, the glacier still descended within easy reach of the trail. Families would come to picnic with their feet on the ice. Today, the glacier terminus sits above 2,000 m, far above the path. That rapid retreat communicates the acceleration of climate change in high mountain environments more eloquently than any graph.

A refreshment hut below the glacier offers a chance to sit down before the final section to Trient. The trail re-enters the forest, crosses a footbridge, and delivers you to the village.

The Glacier du Trient and the Forgotten Ice Trade

Before the invention of the refrigerator, the Glacier du Trient underpinned a trade as improbable as it was lucrative. Workers cut blocks of ice directly from the glacier, sent them sliding down to the valley through long wooden chutes called risses, then loaded them onto carts bound for the railway station at Martigny. From there, the ice travelled by train to Geneva, Lyon, Marseille, and Paris, where it cooled drinks and preserved food in restaurants and hospitals.

This economy disappeared with mechanical refrigeration, then with the retreat of the glacier itself. What had been an everyday occupation for the mountain people of the Valais has become a museum curiosity. Descending from the Fenêtre d'Arpette, facing that diminished glacier, one appreciates the scale of what has changed in just a few generations.

Trient: Arriving at the Village

Trient (1,279 m) is a small Valaisan village without pretension. No souvenir shops, no ski lifts, a few inns and a campsite. The atmosphere is quiet, almost austere after the bustle of Courmayeur or the lakeside charm of Champex.

It is nonetheless a TMB junction: this is where walkers arriving from Bovine and those arriving from the Fenêtre d'Arpette converge to swap stories of the day. The evening conversation invariably returns to the same question: "So which way did you come?"

Accommodation in Trient

• Auberge du Mont-Blanc: the principal address in the village for TMB walkers. Rooms and dormitories, generous half-board, terrace.
• Refuge Le Peuty: below the village, beside the river. Mountain refuge feel, dormitories, wooded surroundings. Well positioned for an early departure toward the Col de Balme.
• Hôtel du Col de la Forclaz (1,526 m): above Trient, on the road pass. Convenient if you arrive via Bovine and prefer not to descend to the village. Rooms and restaurant.
• Camping: a small campsite in Trient for self-sufficient walkers. Simple but serviceable.

Booking ahead is advisable in high season. Trient has limited accommodation capacity. In July and August, reserve at least a week in advance.

Practical Advice

Water and Supplies

Via Bovine: no reliable water source between Champex and the Bovine refreshment hut (roughly 2h30 of walking). Carry at least 1.5 litres. The Bovine hut and the Hôtel du Col de la Forclaz provide resupply thereafter.

Via the Fenêtre d'Arpette: the Relais d'Arpette (30 min) is the last resupply point. Carry a minimum of 2 litres. Streams run through the Val d'Arpette but dry up at altitude. On the descent side, the Glacier du Trient refreshment hut offers drinks and light meals.

There is no shop in Trient. Obtain provisions in Champex the evening before if necessary.

Weather and Timing

The Fenêtre d'Arpette requires clear skies and decent visibility. In case of mist, rain, forecast thunderstorms, or residual snow (common in June), switch to Bovine without hesitation. The scree below the Fenêtre becomes slippery in the wet, and route-finding is problematic in fog.

Via Bovine, an 8:30-9:00 start suffices. Via the Fenêtre d'Arpette, set off early (7:00-7:30) to retain a margin and avoid the afternoon thunderstorms that are frequent in summer.

Vertigo and Technical Difficulty

The Fenêtre d'Arpette has no genuinely exposed passages with significant drops, but the scree is steep and unstable. Walking poles are essential, particularly on the descent. Those who suffer from vertigo should not encounter particular difficulty here — it is the physical effort and the technicality of the terrain (boulders, scree, possible snow) that make this passage exacting.

Frequently Asked Questions about TMB Stage 8

Is the Fenêtre d'Arpette dangerous?

The passage is not dangerous under normal conditions (fair weather, dry trail, no snow). It is, however, physically taxing and technically a notch above the rest of the TMB. The chief risks are a twisted ankle on the scree or losing your bearings in mist. In early season, snowfields can render the crossing awkward without proper equipment. When in doubt, opt for Bovine: the TMB furnishes quite enough memories without courting unnecessary risk.

Can you do an out-and-back to the Fenêtre d'Arpette from Champex?

Yes. This is an option for walkers who wish to see the Fenêtre without committing to the long descent to Trient. Allow 6 to 7 hours for the round trip from Champex. One can also ascend to the Fenêtre, return to Champex, and take the Bovine route the following day.

Is Bovine worthwhile even if you could manage Arpette?

Bovine delivers an entirely different day: long-distance views across the Rhône plain, alpine pastures, a pastoral character. It is not a "Plan B" — it is a route with its own personality. Walkers who have completed the TMB more than once frequently alternate between the two.

Which variant for a 7-day TMB?

In our 7-day TMB itinerary, the decision rests on the day's conditions and the group's fitness level. When conditions permit, the Fenêtre d'Arpette is an unforgettable highlight. But a day via Bovine — with time to linger at the refreshment hut and contemplate the Martigny vineyards below — is scarcely a consolation.

What Comes Next on the TMB

From Trient, the following stage ascends to the Col de Balme (2,204 m), the TMB's final frontier (Switzerland into France). Mont-Blanc reappears directly ahead after days spent on the Italian and Swiss sides. It is one of the most affecting moments of the entire circuit.

To place this stage in the broader context, the complete Tour du Mont-Blanc overview details all 11 stages, variants, and logistics. If you would like to experience the TMB in comfort with carefully chosen accommodation and a dedicated guide, the 7-day TMB with Altimood condenses the best of the circuit into a single week.

You are coming from Stage 7, La Fouly to Champex-Lac: Switzerland's little Canada is behind you. Ahead, the final three stages return you to Chamonix along the southern balcony facing the Mer de Glace and the Drus.

Further Reading