When to Do the Tour du Mont-Blanc: Month-by-Month Season Guide

Altimood, RobinMise à jour le 06/03/26 à 07h03

Choosing the right time to do the Tour du Mont-Blanc is how you tip the odds in your favour for an unforgettable experience — and avoid some nasty surprises, or worse, genuinely risky situations. Unpredictable weather, snow-blocked passes, closed mountain huts, crowded trails: depending on the time of year, conditions can change radically.

We, the mountain guides at Altimood, regularly lead this iconic Alps trek around Mont Blanc. This blog post compiles what we observe season after season, pass by pass, hut by hut. No armchair theory here — just hard-won field experience so you can plan your TMB in 2026 or 2027.

Doing the TMB: late June to early October is the sweet spot

The Tour du Mont-Blanc on foot is best done from late June to early October. Within that window, each month has its own character.

Outside this window, the route stops being a hiking trail and becomes an alpine undertaking: trekking poles give way to ice axes, ropes and crampons, the passes fill with snow and ice, and most of the mountain huts are closed.

The TMB in June: wildflowers, waterfalls and snowfields

Early June is our favourite time of year. The alpine meadows haven't yet been trampled by high season, spring wildflowers carpet them, waterfalls thunder on every slope, and the hut keepers have that particular energy of the season's opening days — when they still have time to tell you about the winter.

The trade-off comes at the high passes. The Fenêtre d'Arpette (2,665 m / 8,743 ft) is the passage to watch most closely: its north-facing slope can stay snowy and icy right up to the last week of June. We sometimes set up a fixed line to get groups through when the snow is daunting. Lightweight hiking crampons in your pack can be a bonus, though they won't replace proper mountaineering crampons on hard ice. If in doubt, the variant via the Col de la Forclaz and the Bovine alp trail is just as beautiful — and far safer. The Col des Fours shares the same characteristics.

Mountain huts generally open around mid-June, but not all at the same time. Check each one's opening date before finalising your itinerary.

The TMB in July–August: crowds, sunshine and afternoon thunderstorms

All passes navigable, all huts open, generally stable weather — except when afternoon thunderstorms decide to call an early end to the day (late-afternoon storms are a regular fixture). This is the most predictable time for the TMB, and also the most crowded. On certain sections — between Champex and Trient, or at the start near Les Contamines — the density of hikers becomes a defining feature of the experience in its own right. Not a dealbreaker, but worth knowing.

This is the period we recommend for a first TMB experience, or for hiking with teenagers: conditions are at their most accessible and predictable. For accommodation, book from March onward, or you'll find the Bonatti and Elisabetta refuges fully booked.

The TMB in September: golden light in the Alps

September is, hands down, our favourite month for roaming the Alps — the TMB is no exception. The light changes: lower in the sky, more golden, it sculpts the relief of Mont Blanc and its aiguilles differently. The larches begin their shy turn to russet and orange, preceded by the berry shrubs — blueberries, rhododendrons, heather. After September 15th, the trails regain a (relative) calm — it's still not quite the Écrins — that gives the trek a more intimate feel with the mountains. That quietness simply doesn't exist in the height of August.

Conditions remain excellent in early September. Towards the end of the month, early snowfall can dust the passes above 2,500 m (8,200 ft) — not usually enough to close them, but caution is still warranted. Some huts close in mid-September: plan your overnight stops accordingly.

Our 7-day guided TMB departures are scheduled in June and September. That's no coincidence.

If you want to join a group with a guide, or take advantage of a fully organised trip (self-guided style), between July and August, we recommend the services of the Grand Angle trekking agency, which offers the TMB in every format imaginable (except bivouac).

The TMB off-season: possibilities and limits

The TMB in April–May: (nearly) impossible

Unless it's been an exceptionally dry winter, April and May are a no for hiking.

The passes still hold several metres of snow, rivers are in flood, and the huts are closed. Hikers attempt it every spring — the Mont Blanc mountain rescue teams know the script by heart.

Only mountaineers or ski tourers can venture onto certain sections, with the appropriate gear and skills.

If you're looking for a spring warm-up alternative, day hikes in the Chamonix valley or a multi-day route like the Tour du Vercors offer great options at lower elevation — and are far more in tune with the seasonal rhythms of plants and wildlife.

The TMB in October: the season winds down

October can still allow a full TMB circuit in mild years, up to roughly mid-month. But the margins shrink fast: huts close one by one from the 1st, daylight hours shorten, and a single snow event can block the Fenêtre d'Arpette or the Grand Col Ferret overnight.

If you're considering October, keep an eye on the webcams, contact each hut to confirm closing dates, and plan a lower-altitude fallback route.

November, December, January, February or March: it's winter!

From November to March, the conversation is over. Several metres of snow, active avalanche couloirs, closed huts. It's a different terrain, a different discipline.

Passes to watch by season

Some sections require extra vigilance at the start or end of the season:

Pass	Altitude	Snow risk early June	Snow risk late September
Col des Fours	2,665 m / 8,743 ft	High	Possible
Fenêtre d'Arpette	2,665 m / 8,743 ft	Very high	High
Grand Col Ferret	2,537 m / 8,323 ft	Moderate	Possible
Col de la Seigne	2,516 m / 8,255 ft	Moderate	Low
Col de la Croix du Bonhomme	2,479 m / 8,133 ft	Moderate	Low

The Fenêtre d'Arpette is the most exposed passage on the TMB. Its north-facing slope holds snow long into the season and its scree can be icy. Early in the season, take the variant via the Col de la Forclaz and the Bovine alp trail: it's just as beautiful, and far safer.

Mountain hut opening calendar

Most TMB huts open between mid-June and early July, and close between mid-September and early October. Here are the broad strokes:

France (Les Houches → Chamonix):

Refuges des Contamines: mid-June to mid-September
Refuge du Col de la Croix du Bonhomme: late June to early September
Refuge des Mottets: June to September

Italy (Courmayeur, Val Ferret):

Rifugio Elisabetta: late June to mid-September
Rifugio Walter Bonatti: mid-June to mid-September
Rifugio Elena: late June to early October

Switzerland (Grand Ferret → Trient):

Auberge de La Peule: mid-June to mid-September
Gîte Alpage de la Peule: June to September
Relais d'Arpette: late June to mid-September

These dates vary from year to year. Check official websites or contact the huts directly before booking.

Smart budget moves for the TMB in early and late season

Your budget can vary considerably depending on the time of year and your accommodation type. In June or September, some operators offer more attractive rates to spread out their season. Expect dormitory beds between €35 and €50, and half-board between €55 and €80.

In peak season (July–August), the same places can charge €50–65 for a dormitory bed and up to €95 for half-board. Over a 7-night circuit, the difference can easily reach €150–200 per person.

If you're watching your budget, June or September are the clear winners.

Our recommendation (pro tips)

If you've read this far without skimming, you already know our verdict: the second half of June or the second half of September.

In June, the mountain is in a state you won't find at any other time of year. The snowfields you cross in the morning, the wildflowers in the meadows, the hut keepers you reconnect with after their winter — all of it gives the trek an atmosphere of renewal that no guidebook can truly capture. You have to be there.

In September, it's the light. Low and golden, it transforms every panorama of Mont Blanc. After the 15th of the month, you can walk for an hour without crossing another soul if you set out at sunrise. On a route as frequented as the TMB, that's an experience in a class of its own.

Our 7-day TMB in comfort style is scheduled around these two windows, with accommodations chosen for their quality and location.

That said, thousands of hikers do the TMB in midsummer and come back with memories they'll carry for life. Our preference is just that — ours — and your schedule has the final say. Our motto will always be: there's no best time, just the time that works for you!

Frequently asked questions about TMB season

If you've read the whole article without skipping ahead, this FAQ will feel repetitive — but as any good mountain guide will tell you, repetition is the foundation of good teaching.

Can you do the TMB in May?

Unless it's been an exceptionally dry winter: no, not as a hiking trip. The passes are still blocked by snow, and so are the huts. For this time of year, day hikes at lower elevation around Chamonix or in the Pre-Alps remain a solid alternative.

Is the TMB possible in October?

Sometimes yes, sometimes no. In years with early snowfall, the Grand Col Ferret or the Fenêtre d'Arpette can become dangerous as early as mid-October. If you go for it, carry crampons and a powerful head torch, and give yourself a plan B.

When should you book TMB huts?

From March onward for July–August. The most popular huts (Bonatti, Elisabetta) fill up well before summer. In September, you have a little more flexibility, but don't leave it too late. For gîtes d'étape, booking 2 to 3 weeks in advance is generally enough.

What's the best time to avoid the crowds?

September after the 15th. Foot traffic drops significantly while conditions remain excellent. June is also a good option, provided you're comfortable with some snowfields at the higher passes.