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

At brekkie in Champex-Lac, the same question pops up at every table: "Are you going Bovine or Arpette?" It's the big call of Stage 8 on the Tour du Mont-Blanc. On one side, the Bovine alpine pasture with sprawling views across the Rhône Valley. On the other, the Fenêtre d'Arpette at 2,665 m — scree, possible snow, and a stunning drop toward the Glacier du Trient. Two completely different routes to the same finish: the Valaisan village of Trient.

Mountain hiking guides, we take groups along both routes regularly. The choice comes down to the weather, how your body is tracking after a week on the trail, and what sort of day you're keen for. This article lays out both options to help you decide, with on-the-ground details, accommodation info, and the key things to watch for on 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 going strong after seven days of hiking, the Fenêtre d'Arpette is the most spectacular passage on the entire TMB. If the weather is iffy, your knees are cooked, or you'd rather have a cruisy day, Bovine delivers a gentle stage with cracking views over the Rhône plain.

The Classic Route: Bovine Alpine Pasture

The official TMB route leaves Champex heading south, dropping to Champex-d'en-Bas (1,359 m) and 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

Reaching the Bovine pasture (1,975 m) is a real turning point. Until now, the TMB has been orbiting the Mont-Blanc massif in a world of glaciers, ridges, and cols. Then suddenly your gaze swings north-west, way 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 spot the Dent de Morcles (2,969 m), the Grand Chavalard (2,899 m), and the first summits of the Bernese Oberland. It's a completely different perspective, and a welcome one after days of close-up glacier scenery.

The Bovine refreshment hut, housed in an alpine chalet since the 1920s, has hot drinks and simple meals. You'll share the benches with walkers who aren't on the TMB at all — they've come just for this under-the-radar lookout.

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 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 on a forest track. You arrive at the village easily, between timber chalets and stone fountains.

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

The Fenêtre d'Arpette is often called the toughest variant on the entire Tour du Mont-Blanc. It's also the one that gives you the greatest contrast in a single day: you go from a green, pastoral valley into a chaos of rock, then swing around to face the Glacier du Trient.

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

You leave Champex-Lac heading north-east into the Val d'Arpette. After about 30 minutes, you reach the Relais d'Arpette (1,627 m), a lodge tucked at the forest edge. This is your last chance to grab food or water before the col.

The trail follows the Val d'Arpette on a solid track through larches and alpine meadows. As you gain altitude, the vegetation thins out. Above 2,200 m, you're in a mineral world: granite blocks, loose scree, trail markings that can be faint. Cairns mark the route, but in poor weather or fog, navigation gets dicey. That's the main reason this variant should be skipped when visibility is rubbish.

The Fenêtre: The Pass and Its Conditions

The Fenêtre d'Arpette (2,665 m) isn't a pass in the usual sense — it's a narrow gap in a rocky ridge, a doorway between two worlds. The final stretch to the top is the most technical section on the TMB. The scree is steep, the rocks move underfoot, and in early season (June, sometimes into early July), snowfields cover the passage. Without crampons or snow experience, it's best to call it and head back.

At the top, the view flips. To the west, the green, enclosed Val d'Arpette you've just slogged up. To the east, the Glacier du Trient, its séracs and moraines, flanked by granite spires. This is the highest point on the TMB if you include the variants. That moment makes every bit of the effort worthwhile.

The Descent to Trient: Scree then Forest

The descent on the Trient side is long and punishing on the knees. You drop nearly 1,300 metres 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, and the scale of the retreat is pretty confronting.

Twenty or thirty years ago, the glacier still reached within easy distance of the trail. Families used to come up and have a picnic with their feet on the ice. Today, the glacier terminus sits above 2,000 m, well above the track. That rapid retreat tells the story of accelerating climate change in the high mountains more clearly than any chart — and if you've travelled from the other side of the world to walk this trail, it really hits home.

A refreshment hut below the glacier gives you a chance to sit down before the last section 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 fridge, the Glacier du Trient powered a trade as unlikely as it was profitable. Workers cut blocks of ice straight from the glacier, slid them down to the valley through long wooden chutes called risses, then loaded them onto carts bound for the station at Martigny. From there, the ice went by rail to Geneva, Lyon, Marseille, and Paris, where it chilled drinks and kept food fresh in restaurants and hospitals.

That economy vanished with mechanical refrigeration, and then with the retreat of the glacier itself. What was once a routine part of life for mountain communities in the Valais is now a museum footnote. Coming down from the Fenêtre d'Arpette, looking at that diminished glacier, you really feel how much has changed in just a few generations.

Trient: Arriving at the Village

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

But it's a proper hub on the TMB: this is where hikers from the Bovine route and those from the Fenêtre d'Arpette meet up to compare notes. The conversation over dinner always comes back to the same question: "So, which way did you come?"

Accommodation in Trient

• Auberge du Mont-Blanc: the main spot in the village for TMB hikers. Rooms and dorms, hearty half-board, terrace.
• Refuge Le Peuty: below the village, by the river. Mountain refuge feel, dorms, bush-like 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. Handy if you arrive via Bovine and don't want to head down to the village. Rooms and restaurant.
• Camping: a small campsite in Trient for self-sufficient hikers. Basic but does the job.

Book ahead in peak season. Trient has limited accommodation. 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 walking). Carry at least 1.5 litres. The Bovine hut and the Hôtel du Col de la Forclaz let you refill after that.

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

There's no shop in Trient. Grab provisions in Champex the night before if you need them.

Weather and Timing

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

For Bovine, an 8:30-9:00 start is plenty. For the Fenêtre d'Arpette, get going early (7:00-7:30) to keep a buffer and dodge the afternoon thunderstorms that roll through in summer.

Vertigo and Technical Difficulty

The Fenêtre d'Arpette doesn't have any truly exposed drop-offs, but the scree is steep and loose. Trekking poles are essential, especially on the way down. If you're not great with heights, you shouldn't have an issue here — it's the physical effort and the rough terrain (boulders, scree, possible snow) that make this passage tough.

Frequently Asked Questions about TMB Stage 8

Is the Fenêtre d'Arpette dangerous?

It's not dangerous in normal conditions (fine weather, dry trail, no snow). It is, however, physically demanding and technically a notch above the rest of the TMB. The main risks are a rolled ankle on the scree or getting turned around in fog. In early season, snowfields can make the crossing dicey without the right gear. If you're not sure, go for Bovine: the TMB gives you more than enough highlights without taking unnecessary risks.

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

Yep. It's an option for hikers who want to see the Fenêtre without copping the long descent to Trient. Allow 6 to 7 hours return from Champex. You can also go up to the Fenêtre, come back to Champex, and take the Bovine route the next day.

Is Bovine worth it even if you could do Arpette?

Definitely. Bovine gives you a completely different day: long views over the Rhône plain, alpine pastures, a pastoral feel. It's not a "Plan B" — it's a route with its own character. Hikers who've done the TMB more than once often chop and change between the two.

Which variant for a 7-day TMB?

In our 7-day TMB itinerary, the choice depends on conditions on the day and how the group is going. When conditions are right, the Fenêtre d'Arpette is an unforgettable highlight. But a day via Bovine — taking your time at the refreshment hut, gazing down at the Martigny vineyards — is no second prize.

What Comes Next on the TMB

From Trient, the next stage heads up to the Col de Balme (2,204 m), the TMB's last border crossing (Switzerland into France). Mont-Blanc reappears right in front of you after days on the Italian and Swiss sides. It's one of the most stirring moments on the whole circuit.

To see where this stage fits in the full picture, the complete Tour du Mont-Blanc overview covers all 11 stages, variants, and logistics. If you'd like to walk the TMB in comfort with handpicked accommodation 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 last three stages bring you back toward Chamonix along the southern balcony facing the Mer de Glace and the Drus.

Continue Reading