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

At breakfast in Champex-Lac, the same question echoes from every table: "Are you going Bovine or Arpette?" This is the big decision of Stage 8 on the Tour du Mont-Blanc. On one side, the Bovine alpine pasture and sweeping views over the Rhône Valley. On the other, the Fenêtre d'Arpette at 2,665 m — scree, possible snow, a jaw-dropping view straight down onto the Glacier du Trient. Two radically different routes for the same finish line: the Valaisan village of Trient.

Mountain hiking guides, we lead groups on both routes regularly. The choice comes down to weather, fitness level, and what kind of day you're after. This article breaks down the two options to help you decide, with on-the-ground data, accommodation info, and 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 holding up after seven days of hiking, the Fenêtre d'Arpette is the most spectacular passage on the entire TMB. If the weather is uncertain, your knees are sore, or you prefer a contemplative pace, Bovine delivers a gentler day with gorgeous views over the Rhône plain.

The Classic Route: Bovine Alpine Pasture

The official TMB route leaves Champex heading south, descending to Champex-d'en-Bas (1,359 m), then crossing the hamlet of Plan de l'Au. From there, you climb gradually through forest toward the Bovine pasture, along a shaded trail winding between spruce trees.

The Bovine Pasture: A Balcony over the Rhône Valley

Arriving at the Bovine pasture (1,975 m) is a turning point. Until now, the TMB has circled the Mont-Blanc massif in a world of glaciers, ridges, and high passes. Suddenly, your gaze carries northwest, far beyond the massif. The Rhône Valley opens up below — wide and deep — with Martigny and its terraced vineyards at the bottom. On a clear day, you can make 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, operating from an alpine chalet since the 1920s, serves hot drinks and simple meals. You'll share tables with hikers who aren't doing the TMB at all, just visiting this under-the-radar viewpoint.

From Collet de Portalo to Col de la Forclaz

Past 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 by the Chalet de la Giète, another alpine pasture. Col de la Forclaz is a road pass with a hotel-restaurant and parking lot.

The descent from Col de la Forclaz to Trient takes 30 to 45 minutes on a forest trail. You arrive at the village gently, between wooden chalets and stone fountains.

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

The Fenêtre d'Arpette is often described as the most challenging variant on the entire Tour du Mont-Blanc. It also delivers the greatest contrast in a single day: you go from a bucolic valley to a mineral chaos, then swing around to face the Glacier du Trient head-on.

The Ascent: From Relais d'Arpette to the Scree Field

The route leaves Champex-Lac heading northeast into the Val d'Arpette. After 30 minutes, you reach the Relais d'Arpette (1,627 m), a lodge tucked at the edge of the forest. This is the last place to refuel before the pass.

The trail follows the Val d'Arpette on a good path through larches and alpine meadows. As you climb, the vegetation thins out. Above 2,200 m, you enter a mineral world: granite blocks, loose scree, trail markings that can be faint. Cairns mark the way, but in poor weather or fog, navigation gets tricky. This is the main reason the variant should be avoided when visibility is bad.

The Fenêtre: The Pass and Its Conditions

The Fenêtre d'Arpette (2,665 m) is not a pass in the traditional sense — it's a narrow breach in a rocky ridge, a doorway between two worlds. The final stretch before the top is the most technical section on the TMB. The scree is steep, the rocks shift underfoot, and in early season (June, sometimes early July), snowfields cover the passage. Without crampons or snow experience, it's better to turn back.

At the top, the view flips. To the west, the green, enclosed Val d'Arpette you just climbed through. To the east, the Glacier du Trient, its seracs and moraines, framed by granite spires. This is the highest point on the TMB when you include the variants. That moment alone justifies every step of the climb.

The Descent to Trient: Scree then Forest

The descent on the Trient side is long and punishing on the knees. You lose nearly 1,300 meters of elevation in under 8 km. Scree gives way to moraine, then a forest trail through larches. You pass close to the snout of the Glacier du Trient, where the retreat is striking.

Twenty or thirty years ago, the glacier still reached within easy distance 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 tells the story of accelerating climate change in the high mountains, more vividly than any chart could.

A refreshment hut below the glacier lets you sit down before the final stretch to Trient. The trail enters the forest, crosses a footbridge, and drops you into the village.

The Glacier du Trient and the Forgotten Ice Trade

Before the invention of the refrigerator, the Glacier du Trient fueled a trade as unlikely as it was profitable. Workers carved blocks of ice directly from the glacier, slid them down to the valley through long wooden chutes called risses, then loaded them onto carts bound for the Martigny train station. From there, the ice traveled by rail to Geneva, Lyon, Marseille, and Paris, where it chilled drinks and preserved food in restaurants and hospitals.

This economy vanished with mechanical refrigeration, then with the retreat of the glacier itself. What was once an everyday task for mountain people in the Valais has become a museum footnote. Walking down from the Fenêtre d'Arpette, facing that diminished glacier, you get a visceral sense of how much has changed in just a few generations.

Trient: Arriving at the Village

Trient (1,279 m) is a small Valaisan village with no frills. No souvenir shops, no ski lifts, a handful of inns and a campground. The vibe is calm, almost austere after the bustle of Courmayeur or the lakeside charm of Champex.

Yet it's a TMB crossroads: this is where hikers coming from Bovine and those coming from the Fenêtre d'Arpette meet up to compare notes on their day. Evening conversations inevitably circle back to the same question: "So, which way did you go?"

Accommodation in Trient

• Auberge du Mont-Blanc: the main address in the village for TMB hikers. Rooms and dormitories, hearty half-board, terrace.
• Refuge Le Peuty: below the village, by the river. Mountain refuge atmosphere, dormitories, wooded setting. Well placed for an early start 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 don't want to descend to the village. Rooms and restaurant.
• Camping: a small campground in Trient for self-sufficient hikers. Basic but functional.

Book ahead in peak season. Trient has limited lodging capacity. In July and August, reserve at least a week in advance.

Practical Tips

Water and Supplies

Via Bovine: no reliable water source between Champex and the Bovine refreshment hut (about 2h30 of hiking). Carry at least 1.5 liters. The Bovine hut and the Hôtel du Col de la Forclaz allow you to resupply after that.

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

There is no grocery store in Trient. Stock up in Champex the evening before if needed.

Weather and Timing

The Fenêtre d'Arpette demands clear skies and good visibility. If fog, rain, thunderstorms, or residual snow is in the forecast (common in June), switch to Bovine without hesitation. The scree below the Fenêtre becomes slippery when wet, and navigation is difficult in fog.

For Bovine, an 8:30-9:00 AM start is fine. For the Fenêtre d'Arpette, leave early (7:00-7:30 AM) to keep a buffer and dodge the afternoon thunderstorms that are frequent in summer.

Vertigo and Technical Difficulty

The Fenêtre d'Arpette has no truly exposed sections with drop-offs, but the scree is steep and unstable. Trekking poles are essential, especially on the descent. People who are afraid of heights won't face particular problems here — it's the physical effort and the technicality of the terrain (boulders, scree, possible snow) that make this passage demanding.

Frequently Asked Questions about TMB Stage 8

Is the Fenêtre d'Arpette dangerous?

The passage is not dangerous in normal conditions (fair weather, dry trail, no snow). It is, however, physically demanding and technically a step above the rest of the TMB. The main risks are a twisted ankle on the scree or getting disoriented in fog. In early season, snowfields can make the crossing tricky without proper gear. When in doubt, choose Bovine: the TMB provides more than enough memories without taking unnecessary risks.

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

Yes. This is an option for hikers who want to see the Fenêtre without tackling the long descent to Trient. Allow 6 to 7 hours round-trip from Champex. You can also climb to the Fenêtre, descend back to Champex, and take the Bovine route the next day.

Is Bovine worth it even if you could do Arpette?

Bovine offers a completely different day: distant views over the Rhône plain, alpine pastures, a pastoral atmosphere. It's not a "Plan B" — it's a route with its own character. Hikers who've done the TMB more than once often alternate between the two.

Which variant for a 7-day TMB?

In our 7-day TMB itinerary, the choice depends on the day's conditions and the group's fitness. When conditions allow, the Fenêtre d'Arpette is an unforgettable highlight. But a day via Bovine — with time to stop at the refreshment hut and gaze down at the Martigny vineyards — is hardly a consolation prize.

What Comes Next on the TMB

From Trient, the next stage climbs to the Col de Balme (2,204 m), the TMB's final border crossing (Switzerland to France). Mont-Blanc reappears directly ahead after days spent on the Italian and Swiss sides. It's one of the most moving moments on the entire circuit.

To put this stage in context, the complete Tour du Mont-Blanc overview covers all 11 stages, variants, and logistics. If you'd like to experience the TMB in comfort with handpicked accommodations and a dedicated guide, the 7-day TMB with Altimood packs the best of the circuit into one week.

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

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