Best months
Jul, Sep
Month-by-month weather, crowds and prices, plus a full calendar of festivals and events worth planning a trip around.
Last reviewed 2026-06
Chamonix has two best windows. Early July (1-19) and the first three weeks of September give you stable weather, every lift and trail open, and Mont Blanc clear on most mornings. For skiing, aim for January's quiet non-holiday weeks or early March. Skip late February half-term and UTMB week (24-30 August).
Best overall: Jul, Sep. Early July (1-19) is the all-rounder: every lift and trail open, wildflowers at their peak, and Mont Blanc clear most mornings, all without August's extreme crowds. Early September matches it for weather and quiet, with post-UTMB availability and the climbing season still open. Both are the answer most visitors are actually after.
Best value: May, Sep. September is the value-and-quality sweet spot: summer weather and open trails at prices 30 to 40 percent below August. Pure budget travellers who only need low valley trails can go in May or November for 50 to 60 percent savings, accepting that many businesses are shut.
Avoid: Aug. UTMB week (24-30 August) is the one to plan around: zero accommodation unless you booked eight to twelve months ahead, and the whole valley at its annual price peak. Mid-February half-term is the ski-side equivalent, with 45-minute lift queues and doubled hotel rates.
| Month | High | Walking score | Crowds | Prices | Highlight |
|---|---|---|---|---|---|
| Jan | 3° | 3 | ●●●○○ | ●●●●○ | Christmas Village |
| Feb | 6° | 3 | ●●●●● | ●●●●● | Chamonix Market |
| Mar | 8° | 4 | ●●●○○ | ●●●○○ | The Unlimited Festival |
| Apr | 12° | 6 | ●●○○○ | ●●○○○ | Chamonix Market |
| May | 15° | 7 | ●○○○○ | ●○○○○ | Freeride Day |
| Jun | 20° | 6 | ●●●○○ | ●●●○○ | Mont-Blanc Marathon |
| Jul | 23° | 6 | ●●●●○ | ●●●●○ | CosmoJazz Festival |
| Aug | 22° | 6 | ●●●●● | ●●●●● | Guides' Festival |
| Sep | 18° | 7 | ●●○○○ | ●●●○○ | Chamonix Market |
| Oct | 15° | 7 | ●○○○○ | ●●○○○ | Chamonix Market |
| Nov | 8° | 5 | ●○○○○ | ●○○○○ | Chamonix Market |
| Dec | 5° | 3 | ●●●●○ | ●●●●● | Christmas Village |
Early July and September deliver the most reliable mountain weather: 18-23°C on the valley floor, clear Mont Blanc views before the afternoon clouds build from around 13:00, and long enough evenings for a late hike on the Grand Balcon Sud.
Late September and early October empty the valley out fast. Prices drop 30 to 40 percent after UTMB clears, the larch forests turn gold from around 5 October, and you can walk the Grand Balcon Sud almost alone.
May and November are the cheapest months of the year, with hotel rates 50 to 60 percent below peak summer. The trade-off is real: many businesses close, high lifts are shut, and the Aiguille du Midi cable car is in maintenance through much of November.
Mid-July carpets the Grand Balcon Sud with alpine lilies, blue gentians and edelweiss, the best wildflower display of the year (peak 10-25 July). The same weeks bring CosmoJazz, with free outdoor concerts at Planpraz 2000m above the valley.
The single week most worth avoiding is UTMB (24-30 August), when over 10,000 trail runners plus their crews book Chamonix completely dry eight to twelve months ahead. Land without a room that week and you sleep in Sallanches or Cluses, 30 minutes down the valley. The mid-February school-holiday week (16-22 February) is the ski-season equivalent: lift queues at Grands Montets top 45 minutes and hotel rates can double versus January. May and November are the inter-season, when 30 to 40 percent of restaurants and small hotels close for two to four weeks and most high-altitude lifts do not run.
January is mid-winter Chamonix: valley highs around 3°C, deep snow on the slopes, and the deep-shade reality of a north-south valley where the floor sees little direct sun on winter afternoons. After the Christmas and New Year frenzy the crowds thin, though prices stay high. The Aiguille du Midi has reopened after its autumn maintenance, and the resort runs at full winter capacity. French school holidays in Zone A begin late in the month and start to refill the slopes.
The vibe The first three weeks are the quiet sweet spot of the ski season: real snow, full lift service, and none of February's queues. You ski genuinely uncrowded pistes at Grands Montets and Le Tour. Short daylight (sunrise around 08:10) and a valley floor that stays shaded are the honest price of January.
Don't miss Deep-winter skiing with empty mid-week pistes, plus the last days of the Christmas Village on Place du Triangle de l'Amitié running until 4 January. Cold, clear high-pressure days give some of the sharpest Mont Blanc views of the year.
Crowd drivers The post-New-Year lull, until French Zone A school holidays start refilling the resort in the last week of January.
In season Peak Savoyard comfort season: raclette, tartiflette and fondue everywhere, and the Saturday market stocked with reblochon and tomme de Savoie even in deep winter.
Heads up New Year's Day (1 January) closes most shops, though lifts run; restaurants book out with set menus, so reserve ahead.
Hotel rates run 20 to 30 percent below the December peak once New Year passes; the ski-pass day rate holds around 65 euros.
Wooden chalets fill the Place du Triangle de l'Amitié with local artisans, Savoyard foods and decorations, open daily 11:30 to 19:00 (Fridays until 21:00).
It overlaps the ski-season opening, so you get fresh snow on the slopes and a festive valley at once, the ideal family timing for a first winter visit.
February is the high point of the ski season and the most crowded month of winter. French school holidays stagger across the month (Zone A roughly 7-22 February, Zone C roughly 14 February to 1 March 2026), and Belgian, Dutch and German half-terms pile in mid-month. Snow is reliable and the slightly milder 5-6°C valley highs and longer days make for pleasant on-piste conditions, but lift queues and prices are at their annual ski peak.
The vibe This is Chamonix at its most festive and its most expensive at once. The buzz is real, but so are the 45-minute lift lines at Grands Montets during the 16-22 February overlap week. If you dislike queues, take the first or last week of February for the same snow with 30 to 40 percent fewer skiers on-piste.
Don't miss Peak-season skiing across the full domain, the longest reliably-snowy days of winter, and the best on-piste conditions of the year if you can navigate the crowds.
Crowd drivers French school holidays (Zones A, B, C staggered) overlapping Belgian, Dutch and German half-terms mid-month.
In season Mountain-restaurant season at full swing: long lunches of tartiflette and croziflette at the refuges above the pistes.
The busiest ski month: the week of 16-22 February is the absolute peak, when accommodation can double versus January. Book four to six months ahead.
March is spring skiing, and one of the smartest months to come. Most French school zones finish by early March, valley highs climb toward 8°C, and the longer, sunnier days (8.6 sun-hours) make for warm, bluebird skiing with late-season powder still possible up high. Crowds and prices ease back to shoulder levels from mid-month, apart from the Unlimited Festival spike at the end.
The vibe The connoisseur's ski month: soft spring snow in the afternoon, hard morning pistes for the early risers, and far fewer people than February. Long sunny terrace lunches at altitude are the signature of March, when the sun finally has real warmth in it.
Don't miss Spring skiing at its best, plus the five-day Unlimited electronic music festival (25-29 March) with DJ sets on the slopes and concerts in town.
Crowd drivers Mostly quiet once French school zones wrap up early in the month; the Unlimited Festival (25-29 March) refills the town for one week.
In season Last full month of the Savoyard fondue-and-raclette season before the spring inter-season closures begin.
From mid-March, shoulder pricing returns: hotels run 25 to 35 percent below the February peak. The Unlimited Festival week (25-29 March) brings a sharp uplift.
A five-day electronic music festival on the slopes and in town: house, techno and drum and bass, with DJ sets at altitude, outdoor concerts and club nights (18+, tickets 15 to 69 euros).
The rave-at-3842m concept is unique, pairing late-season spring skiing with a festival, but it is also the one March week to skip if you want quiet slopes.
April is true shoulder season, when the lifts close one by one (Balme around 12 April, Grands Montets to 3 May) and the valley shifts gear. Highs reach a mild 12°C, the snowline retreats, and hiking trails are still partly snow-covered at altitude. Easter Monday (6 April 2026) brings a brief crowd spike, but otherwise the valley is calm and noticeably cheaper.
The vibe An in-between month with its own quiet charm. You can ski spring snow up high in the morning and sit on a sunny terrace in a t-shirt by afternoon. Just know that some lifts and businesses are already winding down toward the May inter-season, so check what is running before you commit.
Don't miss Late-season spring skiing on the remaining high lifts, with the rare combination of morning snow and afternoon sun. The first low valley walks open up as the snow retreats.
Crowd drivers Quiet overall, with a short Easter-weekend spike around 5-6 April.
Heads up Lifts begin closing for the season (Balme around 12 April); Easter Monday (6 April) closes shops, though most lifts still run.
The cheapest ski month: accommodation runs 40 to 50 percent below February. After Easter, rates fall close to off-season levels.
May is the inter-season, the creuset, when the valley goes genuinely quiet. Skiing ends on 3 May with Freeride Day at Grands Montets, the hiking trails are still partly snow-covered at altitude, and many restaurants and hotels close for two to four weeks. It is also the wettest month on the valley floor (192mm, 18 rain days), a mix of snowmelt and rain. Highs reach a mild 15°C in the sun.
The vibe Be honest with yourself about May. The valley is at its emptiest and cheapest, but roughly 30 to 40 percent of businesses are shuttered, the high lifts are closed, and the weather is changeable. Great for a budget-conscious hiker happy to walk low trails and accept limited infrastructure, frustrating for a first visit.
Don't miss Freeride Day (3 May) closes the ski season at Grands Montets with a waterslide challenge, zip-line and costume contest. Low valley walks and the first wildflowers appear as the snowline lifts.
Crowd drivers Lowest visitor pressure of the warm half of the year; the Ascension long weekend (14 May) brings a small bump.
Heads up Peak inter-season closures: roughly 30 to 40 percent of restaurants, small hotels and activity providers shut for two to four weeks. High-altitude lifts (Brévent, Flégère, Grands Montets) are closed.
The cheapest month of the year: hotel rates often 50 to 60 percent below peak summer. Ideal for budget hikers who only need low trails.
The official end-of-winter party at Les Grands Montets: a waterslide challenge, zip-line, DJ sets, costume contest and parets sled races mark the last day of the ski season.
It is the final ski day of the year, with great spring snow and pure party energy, a fun reason to time a closing-weekend trip.
June opens the summer hiking season. The high lifts reopen mid-month (exact dates weather-dependent), valley highs reach 20°C, and daylight stretches to nearly 16 hours, with the solstice giving light from around 05:45 to 21:30. Trails clear of snow week by week, though it can still be wet. The Marathon du Mont-Blanc (25-28 June) spikes the final weekend hard, but the rest of June is calm and good value.
The vibe The valley wakes up. Early June is one of the best-kept secrets here: trails opening, wildflowers starting, long light evenings, and prices still low before July arrives. The catch is the high lifts may not all be running yet, and the last weekend belongs entirely to 10,000 marathon runners and closed streets.
Don't miss The first full hiking weeks once the high lifts reopen, with the longest daylight of the year for late-afternoon walks. The Marathon du Mont-Blanc turns the final weekend into a free mountain spectator event.
Crowd drivers Quiet early in the month, then the Marathon du Mont-Blanc (25-28 June) and the start of European half-terms in the last week.
Good value pre-marathon, but the Marathon du Mont-Blanc weekend (25-28 June) sells out six months ahead with rates up 60 to 80 percent over the June base.
A multi-race trail weekend with over 10,000 participants: a 90km ultra, a vertical kilometre, the 42km marathon (Sunday 06:45), a 23km cross and a 10km, set against the Mont Blanc massif.
A spectacular spectator event in a dramatic setting, but streets close and hotels sell out six months ahead, so avoid the weekend if you need smooth road access.
July is high summer and one of the two best months to visit. The Tour du Mont Blanc is in full flow, alpine wildflowers peak mid-month, and valley highs sit at a comfortable 22-23°C, not the punishing heat of a Mediterranean city, though the narrow valley can trap 30°C-plus on hot days. Afternoon thunderstorms are common but usually short. This is also when private guides charge their summer-maximum rates and book out, while our in-browser AI guide stays a flat 5 euros an hour, walking you through the valley sights, telling the story at each stop and answering whatever you ask as you go. Mornings are clearest, since clouds build on Mont Blanc from around 13:00.
The vibe July 1-19 is the genuine sweet spot: peak-summer access to everything, wildflowers carpeting the Grand Balcon Sud, and clear morning summit views, all before August's extreme crowds arrive. It is busy and not cheap, but it earns it. Start early to beat the tour groups and you get the mountains nearly to yourself.
Don't miss Peak alpine wildflowers on the Grand Balcon Sud (best 10-25 July), prime Mont Blanc climbing season, and CosmoJazz (20-25 July) with free concerts at Planpraz 2000m. Book the Aiguille du Midi for the 06:45 slot weeks ahead.
Crowd drivers French school holidays start around 5 July, Tour du Mont Blanc hikers in full flow, and the Bastille Day bridge (13-14 July).
In season The Saturday market is at its summer best, piled with reblochon, tomme de Savoie and local honey; arrive before 09:00 before the best produce goes.
Hotels run 50 to 70 percent above the April low; the Aiguille du Midi round trip is around 83 euros. Reserve accommodation six or more weeks ahead.
Six days of jazz and contemporary music in mountain settings: free concerts at Planpraz 2000m, in town squares and across valley venues.
Free outdoor concerts at altitude are a rare thing, adding festival energy to peak summer without the crush of UTMB.
France's national day, marked with fireworks over the valley and street celebrations; some shops close.
A good spectacle on a summer evening, though a Monday bridge can push up crowds, so book accommodation around it.
An outdoor market at the Place du Triangle de l'Amitié with local produce, artisans and Savoyard foods, running every Saturday in all seasons.
The best Saturday-morning ritual in the valley, at its richest in July to September with local summer produce, but go before 09:00 before the best cheeses sell out.
August is the busiest month of the year in Chamonix, busier even than Christmas and New Year. All French schools are on holiday, the Fête des Guides (12-16 August) and Assumption Day (15 August) fill the town, and UTMB week (24-30 August) brings over 10,000 runners and their crews for the most extreme demand of the year. Valley weather is warm at 22°C with slightly wetter, short afternoon storms. The mountains are spectacular, the prices and crowds relentless.
The vibe August is the month to plan carefully or skip. The valley is at full pitch: every viewpoint busy, the Mer de Glace cable car queue brutal in the sun, and UTMB week sleeping the whole town dry. For a summit attempt it is actually the worst month, since warming rock faces have triggered rockfalls. Come for the atmosphere, not the calm.
Don't miss The Fête des Guides (12-16 August) is the most authentic local event of the year, with a bread festival, an illuminated boat procession on the Arve and the main ceremony on 15 August. Watching UTMB runners through the Chamonix finish arch from 19:00 on 28 August is free and electric.
Crowd drivers Every French school on holiday at once, the Fête des Guides and Assumption Day (15 August), and UTMB week (24-30 August) at the annual peak.
Heads up Assumption Day (15 August) closes shops and brings a massive day-tripper influx; it falls on a Saturday in 2026 with no long-weekend bridge.
The absolute annual peak. UTMB week (24-30 August) sells rooms out eight to twelve months ahead; hotels sit at their yearly maximum all month.
The annual festival of the Compagnie des Guides de Chamonix, founded in 1821: a bread festival in Le Lavancher (13 August), climbing displays in Argentière (14 August), an illuminated boat procession on the Arve (14 August), and the main ceremony and market in Chamonix on 15 August.
The most authentic local event of the year, a deeply alpine cultural moment that ties into Assumption Day.
The world's most prestigious trail ultramarathon, with multiple races (the 174km UTMB starts 28 August, TDS and PTL start 24 August, OCC and CCC on 28 August) and over 10,000 runners.
A spectacular free spectator event, with runners coming through the town arch from 19:00 to midnight, but hotel prices hit their annual peak, so book eight to twelve months ahead or stay away.
A national public holiday and the main ceremony day of the Fête des Guides, drawing a massive day-tripper influx across all the French Alps.
The busiest single day of the summer; in 2026 it falls on a Saturday with no long-weekend bridge, but the valley is still at full capacity.
An outdoor market at the Place du Triangle de l'Amitié with local produce, artisans and Savoyard foods, running every Saturday in all seasons.
The best Saturday-morning ritual in the valley, at its richest in July to September with local summer produce, but go before 09:00 before the best cheeses sell out.
September is the second of Chamonix's two best windows. Families are back at school, the Mont Blanc climbing season is still open early in the month, and Tour du Mont Blanc hikers thin out to leave the trails quieter. Valley highs sit at a comfortable 18°C, September is the driest month on the floor (93mm), and Mont Blanc views stay clear on most mornings. Prices fall sharply once UTMB clears in early September.
The vibe If July is the wildflower window, September is the quiet one. Same open trails and lifts, far fewer people, softer light, and prices well below August. The first three weeks (1-20 September) are the genuine sweet spot, with the climbing season still open and the trails increasingly your own.
Don't miss Quiet Tour du Mont Blanc hiking, a still-open Mont Blanc climbing season early in the month, and the clearest, driest mountain weather of the warm half of the year for summit views.
Crowd drivers Crowds fall away fast as schools resume across Europe; only the first days carry over the tail of UTMB.
Prices drop around 30 to 40 percent versus August once UTMB clears, making September the value-and-quality window of the summer.
An outdoor market at the Place du Triangle de l'Amitié with local produce, artisans and Savoyard foods, running every Saturday in all seasons.
The best Saturday-morning ritual in the valley, at its richest in July to September with local summer produce, but go before 09:00 before the best cheeses sell out.
October eases the valley toward the autumn inter-season. The larch forests turn gold and orange from early October, peaking around 5-20 October at 1000-2000m, and some days still reach a mild 10-15°C. October is the driest-feeling month with only 11 rain days, though daylight shortens to under 11 hours. The high lifts wind down for maintenance and the Aiguille du Midi cable car closes mid-November for its annual check.
The vibe Quietly one of the most beautiful and underrated times to come. Golden larches set against the white summits, near-empty trails, soft golden-hour light from 17:00, and prices well down. The trade-off is that lifts and businesses are starting to close, so it suits a walker happy to keep to the lower, still-open valley trails.
Don't miss Autumn foliage at its peak (around 5-20 October), spectacular for valley walks, plus the first permanent snow appearing on slopes above 2500m mid-month for a striking gold-and-white contrast.
Crowd drivers The quiet shoulder before the November inter-season; no school holidays and very low visitor pressure.
Heads up High lifts begin closing for maintenance; the Aiguille du Midi cable car shuts mid-November for its annual safety check.
Hotel rates sit near the low-season floor, around 40 percent below summer. Many restaurants are still open early in the month.
An outdoor market at the Place du Triangle de l'Amitié with local produce, artisans and Savoyard foods, running every Saturday in all seasons.
The best Saturday-morning ritual in the valley, at its richest in July to September with local summer produce, but go before 09:00 before the best cheeses sell out.
November is the quietest month of the year, the deep inter-season before winter. The Aiguille du Midi cable car is in its annual maintenance, many businesses close for two to four weeks, and the first permanent snow settles above 2000m. Valley highs drop to around 8°C with short days and low sun. The ski season has not yet started, so there is little to actually do.
The vibe The off-season at its most extreme. The valley genuinely goes quiet, prices bottom out, and there is a stark beauty to the first snow on the high peaks. But with lifts shut, the Aiguille du Midi closed and a third or more of businesses shuttered, this is for budget travellers and quiet-seekers only, not a first visit.
Don't miss Low valley walks under fresh snow on the high peaks, and the cheapest hotel rates of the year. Little else is operating, so plan around what stays open.
Crowd drivers Effectively no tourist pressure: the gap between the summer and ski seasons.
Heads up Peak inter-season shutdown: the Aiguille du Midi cable car is in annual maintenance and many restaurants, shops and providers close for two to four weeks.
The lowest prices of the year, around 50 to 60 percent below the August peak, but with limited activities available.
December restarts the ski season. The Aiguille du Midi reopens around 20 December after its autumn maintenance, the full resort opens around the same date, and the Christmas Village fills Place du Triangle de l'Amitié from 18 December. Valley highs sit near 5°C with the shortest days of the year (around 8h30 of daylight). Christmas week (24-31 December) brings very high demand and premium prices.
The vibe The festive heart of winter, with fresh snow, Christmas lights and a buzzing valley. Early December, before the resort fully opens around 20 December, can be a quiet, cheaper window. From Christmas onward it is busy and expensive, so the choice is the calm early weeks or the full festive spectacle, with little in between.
Don't miss The Christmas Village on Place du Triangle de l'Amitié (from 18 December) pairs festive chalets with the ski-season opening. Crisp, clear high-pressure days deliver some of the sharpest Mont Blanc views of the year.
Crowd drivers Quiet until the resort fully opens around 20 December, then very high demand over Christmas week and New Year's Eve.
In season Savoyard season at its richest: raclette, tartiflette and fondue everywhere, and the Christmas market stalls full of local cheese and charcuterie.
Heads up Christmas Day (25 December) closes most restaurants or fills them with set festive menus, though lifts run; reserve weeks ahead.
Christmas and New Year reach premium pricing comparable to February. The 24-31 December week and New Year's Eve sell out months ahead.
Wooden chalets fill the Place du Triangle de l'Amitié with local artisans, Savoyard foods and decorations, open daily 11:30 to 19:00 (Fridays until 21:00).
It overlaps the ski-season opening, so you get fresh snow on the slopes and a festive valley at once, the ideal family timing for a first winter visit.
Annual highlights worth timing a trip around, listed month by month.
The rules buried in forums, in one place.
On these dates many shops and offices close, transport thins out, and sights can be mobbed or shut. Plan around them.
| Date | Holiday | What closes |
|---|---|---|
| Jan 1 | New Year's Day | Most shops closed. Ski lifts run as normal, since mountain transport is essential to the resort, but restaurants book out fast with set holiday menus, so reserve ahead. |
| Apr 6 | Easter Monday | Shops closed; lifts mostly still running for late-season skiing. A brief crowd spike over the Easter weekend, but nowhere near February's pressure. |
| May 1 | Labour Day | Shops, banks and post offices closed. It coincides with the very end of the ski season (lifts close 3 May), so the resort is already winding down. |
| May 14 | Ascension Day | Shops closed Thursday, often bridged into a long weekend. The hiking season is only just opening and high trails are still partly snow-covered. |
| Jul 14 | Bastille Day | France's national day brings fireworks over the valley and street celebrations; some shops close. Falling on a Tuesday in 2026, it can bridge with Monday 13 July for a mini crowd spike. Lifts run. |
| Aug 15 | Assumption Day | Peak summer and the main day of the Fête des Guides. Shops close and a massive day-tripper influx hits the whole French Alps. It falls on a Saturday in 2026, so there is no long-weekend bridge, but it is still the busiest single day of summer. |
| Nov 11 | Armistice Day | Shops closed. Deep inter-season: lifts are not yet open for winter and much of the valley is quiet, with the Aiguille du Midi cable car in its annual maintenance. |
| Dec 25 | Christmas Day | The ski season is open and lifts run. Most restaurants either close or are fully booked with set festive menus, and accommodation prices sit at a Christmas peak comparable to February. Reserve everything weeks ahead. |
Same city, different trip. Here's the month that fits how you're travelling.
Early July (1-19) or the first three weeks of September: all lifts open, the Aiguille du Midi bookable with lead time, and clear summit views most mornings. Avoid UTMB week and February half-term unless you booked six months out.
Late September or early October for golden larch forests, near-empty trails, and soft golden-hour light from 17:00, with prices 40 to 50 percent below summer.
Early July (5-15) or late August after UTMB (31 August onward): all activities open, the Parc de Merlet wildlife park and the Montenvers train both excellent for children, and a mild 22-24°C in the valley.
May or November for hotel rates 50 to 60 percent below peak, paired with free hikes (Grand Balcon Sud, Lac Blanc, Réserve des Aiguilles Rouges). Early June or early October give better activity access for a smaller saving.
July and August for the Saturday market at its summer peak (reblochon, tomme de Savoie, diots), or December for raclette, tartiflette and fondue season at its richest, plus the Christmas market on Place du Triangle de l'Amitié.
Chamonix has two best windows. For summer, early July (1-19) and the first three weeks of September give stable weather, every lift and trail open, peak wildflowers in July, and clear Mont Blanc views most mornings. For skiing, January's quiet non-holiday weeks and early March offer the best snow with manageable lift queues.
May and November are the cheapest months, with hotel rates 50 to 60 percent below peak summer. Both are the inter-season, when 30 to 40 percent of businesses close and most high lifts do not run. For a cheaper trip with more open, try April (40 to 50 percent off ski peak), early June or early October.
UTMB week (24-30 August) is the week to avoid unless you booked eight to twelve months ahead, since over 10,000 runners fill every room. Mid-February half-term (16-22 February) is the ski-side equivalent, with 45-minute lift queues and doubled hotel rates. The May and November inter-seasons see most lifts and many businesses closed.
For the best mix of snow and short queues, come in January's non-holiday weeks (the first three) or early March for spring skiing. February has the most reliable snow and the most festive atmosphere, but it is also the busiest and priciest ski month, with French and Benelux school holidays overlapping mid-month.
The hiking season runs roughly mid-June to early October. High lifts reopen mid-June and trails clear of snow through the month. July and September are the prime months, with July adding peak wildflowers (best 10-25 July) and September offering quieter trails and the driest valley weather. May trails are still partly snow-covered at altitude.
Early October is a quiet, underrated time: larch forests turn gold and orange (peak 5-20 October), trails are near-empty, light is soft from 17:00, and prices sit around 40 percent below summer. The catch is that high lifts begin closing and the Aiguille du Midi shuts mid-November, so keep to the lower valley trails.
The Mont Blanc climbing season runs late June to early September, with July the prime month. Choose late June or early September over August: permafrost thaw has triggered repeated rockfalls on the normal routes in recent Augusts, and the Compagnie des Guides de Chamonix now advises against an August summit attempt. June and September give more stable snow.
August is the busiest month of the year, busier even than Christmas and New Year. All French schools are on holiday, the Fête des Guides and Assumption Day (15 August) fill the town, and UTMB week (24-30 August) brings over 10,000 runners and sells rooms out eight to twelve months ahead. Expect peak prices and long queues at every cable car.
Three to four days lets you ride the Aiguille du Midi, take the Montenvers train to the Mer de Glace, and do one or two signature hikes such as the Grand Balcon Sud or Lac Blanc. A week suits a serious hiking or skiing trip with weather buffer, since afternoon cloud and storms can shut down summit views on any given day.
Summer valley highs sit at a comfortable 22-23°C in July and August, occasionally reaching 30°C-plus on hot days as the narrow valley traps heat. Afternoon thunderstorms are common but usually short, so mornings are clearest. At the Aiguille du Midi (3842m) it stays near or below freezing year-round, so carry warm layers regardless of valley temperature.
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