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

At breakfast in Champex-Lac, the same question comes up at every table: "Are you taking Bovine or Arpette?" It's the defining choice of Stage 8 on the Tour du Mont-Blanc. On one side, the Bovine alpine pasture with panoramic views across the Rhône Valley. On the other, the Fenêtre d'Arpette at 2,665 m — scree, possible snow, and a dramatic view down onto the Glacier du Trient. Two very different routes that both end at the same destination: the Valaisan village of Trient.

Mountain hiking guides, we lead groups along both routes on a regular basis. The choice depends on the weather, how your body is holding up, and what kind of experience you're looking for. This article lays out the two options to help you make the call, with trail data, accommodation details, and the important 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 hiking, the Fenêtre d'Arpette is the most spectacular passage on the TMB. If the weather looks uncertain, your knees are worn out, or you'd prefer a more relaxed pace, Bovine offers a gentler day with magnificent 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) before crossing the hamlet of Plan de l'Au. You then climb gradually through forest toward the Bovine pasture, on a shaded trail winding between spruce trees.

The Bovine Pasture: A Balcony over the Rhône Valley

Arriving at the Bovine pasture (1,975 m) marks a clear shift. Until this point, the TMB has circled the Mont-Blanc massif in a world of glaciers, ridges, and high passes. Then suddenly, your gaze carries northwest, well 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 find yourself sharing tables with hikers who have no connection to the TMB — they've come just for 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 parking area.

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

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

The Fenêtre d'Arpette is widely regarded as the most demanding variant on the entire Tour du Mont-Blanc. It also offers the sharpest contrast in a single day: you move from a peaceful valley into a landscape of bare rock, then pivot to face the Glacier du Trient.

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

The route leaves Champex-Lac heading northeast into the Val d'Arpette. After about 30 minutes, you reach the Relais d'Arpette (1,627 m), a refuge-lodge set at the edge of the forest. It's the last place to pick up food or water before the col.

The trail follows the Val d'Arpette on a solid path through larches and alpine meadows. As you climb, the vegetation gradually disappears. Above 2,200 m, you enter a mineral landscape: granite blocks, loose scree, trail markings that can be faint. Cairns guide the way, but in poor weather or fog, route-finding becomes difficult. This is the primary reason the variant should be avoided when visibility is poor.

The Fenêtre: The Pass and Its Conditions

The Fenêtre d'Arpette (2,665 m) isn't a pass in the conventional sense — it's a narrow breach in a rocky ridge, a threshold between two worlds. The final stretch to the summit is the most technical 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 panorama shifts completely. To the west, the green, sheltered Val d'Arpette you've 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 the variants are included. That view alone makes every meter of the climb worthwhile.

The Descent to Trient: Scree then Forest

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

Twenty or thirty years ago, the glacier still extended within easy reach of the trail. Families would come to have a picnic with their feet on the ice. Today, the glacier terminus sits above 2,000 m, far above the path. That rapid retreat illustrates the acceleration of climate change in the high mountains more vividly than any graph — something that resonates whether you've come from across the Atlantic or across the world.

A refreshment hut below the glacier lets you rest before the final stretch to Trient. The trail 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 powered a trade as improbable as it was lucrative. Workers cut blocks of ice directly from the glacier, slid them down to the valley through long wooden chutes called risses, then loaded them onto carts destined for the Martigny train station. From there, the ice traveled by rail to Geneva, Lyon, Marseille, and Paris, where it cooled drinks and preserved food in restaurants and hospitals.

This economy disappeared with mechanical refrigeration, and then with the retreat of the glacier itself. What was once part of everyday life for mountain communities in the Valais has become a museum curiosity. Descending from the Fenêtre d'Arpette, looking at that diminished glacier, you grasp 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 with no pretension. No souvenir shops, no ski lifts, a few inns and a campground. The atmosphere is quiet, nearly austere after the energy of Courmayeur or the lakeside appeal of Champex.

It's nonetheless a key junction on the TMB: this is where hikers arriving from Bovine and those arriving from the Fenêtre d'Arpette converge to compare their stories. The dinner conversation invariably circles 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, generous half-board, terrace.
• Refuge Le Peuty: below the village, beside the river. Mountain refuge atmosphere, dormitories, wooded setting. Well positioned 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 prefer not to descend to the village. Rooms and restaurant.
• Camping: a small campground in Trient for self-sufficient hikers. Simple but functional.

Book ahead in peak season. Trient has limited accommodation 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 let you 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, the Glacier du Trient refreshment hut offers drinks and light meals.

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

Weather and Timing

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

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

Vertigo and Technical Difficulty

The Fenêtre d'Arpette has no truly exposed sections with significant drop-offs, but the scree is steep and unstable. Trekking poles are essential, particularly on the descent. People who are uncomfortable with heights shouldn't face specific difficulties 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 isn't dangerous in normal conditions (fair weather, dry trail, no snow). It is, however, physically demanding and technically harder than the rest of the TMB. The primary risks are a twisted ankle on the scree or losing your bearings in fog. In early season, snowfields can make the crossing difficult without proper equipment. When in doubt, opt for Bovine: the TMB delivers more than enough highlights 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 committing to 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 following day.

Is Bovine worth it even if you could do Arpette?

Absolutely. Bovine offers a completely different day: distant views across the Rhône plain, alpine pastures, a pastoral atmosphere. It's not a "Plan B" — it's a route with its own distinct character. Hikers who've completed 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 linger at the refreshment hut and look out over the Martigny vineyards — is far from 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 into France). Mont-Blanc reappears directly ahead after days spent on the Italian and Swiss sides. It's one of the most memorable moments on the entire circuit.

To see where this stage fits in the overall journey, 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 carefully selected accommodations and a dedicated guide, the 7-day TMB with Altimood brings the best of the circuit together in one week.

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

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