Hiking · Chamonix valley · Haute-Savoie

Lac Blanc hike without the cable car from Chamonix

You can also reach Lac Blanc without the Flégère gondola, on trails through the Aiguilles Rouges nature reserve. This page repeats what the official sheets say for each route (start, time, climb, difficulty, dates), where to park, the rules at the lake and the altitudes of the valley.

In short. Without a cable car, the Chamonix tourist office sheets describe two ways on foot: from the Col des Montets (start at 1,461 m, 9.4 km, 890 m of climbing, 5 h round trip, “difficult”) and from Tré-le-Champ (an 11 km loop, 5 h, “very difficult”). The lake is at 2,353 m. These trails are not open all year: the sheets give dates subject to snow and weather, and swimming is banned.

A day at your own pace

Three ways to walk up

The figures below are those of the official sheets, as published; where two sheets differ, both are given. None says what state the trail is in today.

From the Col des Montets

Tourist office sheet: start at 1,461 m behind the nature reserve chalet, 9.4 km, 890 m of climbing, highest point 2,350 m, 5 h round trip, rated “difficult (high gradient)”. The trail climbs a combe to the La Remuaz plateau, passes the small Lac de la Remuaz, turns right at the Tête aux Vents crossroads and ends across large boulders with fixed equipment, up to a depression above the lake and the refuge. Open from 15 June to 31 October, “subject to favorable snow and weather conditions”.

From Tré-le-Champ (alpine lakes trail)

Haute-Savoie département sheet: start at the Tré-le-Champ car park (1,429 m), an 11 km loop in 5 h, “very difficult”, past the Aiguillette d’Argentière, the Chéserys lakes, Lac Blanc and Lac de la Remuaz, returning via the Col des Montets. Open from 15 June to 1 November, with the same snow and weather reservations. The sheet gives no elevation gain.

From Chamonix to La Flégère, then to the lake

The tourist office sheet “Hike to La Flégère from Chamonix” starts on the Route des Moussoux (1,096 m): 8 km, 4 h 10, “difficult”, open from 1 May to 31 October subject to snow and weather. It leads to the Flégère site, not to the lake: add the climb to Lac Blanc (about 2 h from the top of the gondola, per the tourist office). No sheet gives a total time for this route.

Things to do in Chamonix: Lac Blanc and other outings

For comparison: the Flégère route

The tourist office recommends the Flégère gondola for children and for those new to mountain hiking and counts “a two-hour hike” from the top. The Loopi sheet for the same route gives a start at 1,875 m, 7 km, 549 m of climbing, arrival at 2,353 m, and contradicts itself on time: 3 h in its header, 1 h 45 in its text. Via the Col des Montets or Tré-le-Champ, the office warns the routes are “technical and sometimes aerial” and “not suitable for everyone”.

Season, snow and conditions

According to the tourist office, high-altitude hikes such as Lac Blanc are only accessible in summer and autumn depending on snow, and snow makes it unsafe to hike at certain altitudes until the end of June. The opening dates on the sheets are announced dates only: before setting out, check the official sources and the weather of the day, and ask La Chamoniarde (+33 4 50 53 22 08). The sheets also remind you that trail conditions can change.

Chamonix webcams

Where to park and how to get there without a car

Col des Montets: the sheet names the Col des Montets car park as the nearest parking; the nearest bus stop and railway station are Montroc, about 20 min on foot. Tré-le-Champ: a car park near the start (1,429 m); by bus, line no. 1 (Tour – Col des Montets), stop Montroc; by train, Montroc station (1,360 m) on the Chamonix – Martigny line. From Chamonix: the sheet gives the Vallot bus stop and the Saint-Michel car park. The tourist office’s transport page lists the Skibus, Proxibus and Chamonuit lines and the Mont Blanc Express train via Les Praz, Argentière and Vallorcine. None of these sheets says whether a car park has room: arrive early and check the signs.

Public transport in the valley

Rules: swimming, dogs, bivouac

Swimming and boating are banned at Lac Blanc and the Chéserys lakes by prefectoral order (dated 22 May 2025 according to the tourist office). The Col des Montets and Tré-le-Champ sheets say dogs are not allowed, as the path is in the Aiguilles Rouges nature reserve; the Chamonix – Flégère sheet says “animals accepted”: check before bringing a dog. The office asks visitors to stay on the lake shores and avoid sunscreens and other products that pollute. The Lac Blanc refuge “has no drinking water”: carry enough. According to the press (23 June 2026), bivouac in the reserve is allowed from 7 pm to 9 am by reservation (reserve-bivouac74.fr), from 1 June to 30 September.

Altitudes of the valley: Chamonix, Aiguille du Midi, Mont Blanc

Chamonix village is at 1,035 m in our catalogue; Lac Blanc at 2,353 m (the Col des Montets sheet gives 2,350 m for its highest point); the Aiguille du Midi at 3,842 m according to the tourist office. Mont Blanc was measured at 4,805.59 m in 2023, the latest known measurement read on 13 October 2026: its height changes from one campaign to the next with the thickness of snow and ice on the summit, which is why it is quoted as “about 4,806 m”.

Views of Mont Blanc

Your questions

Before you go

Can you hike to Lac Blanc without a cable car?

Yes. The Chamonix tourist office sheets describe a start at the Col des Montets and the département sheet a start at Tré-le-Champ. The office warns these routes are technical, sometimes aerial, and not suitable for everyone.

How long is the Lac Blanc hike without La Flégère?

From the Col des Montets: 5 h round trip for 9.4 km and 890 m of climbing. From Tré-le-Champ: an 11 km loop in 5 h. With the gondola, the office counts about 2 h of walking from the top (the Loopi sheet says 3 h in its header and 1 h 45 in its text).

Where do you park for Lac Blanc?

According to the sheets: the Col des Montets car park, the Tré-le-Champ car park or, for the climb from Chamonix, the Saint-Michel car park; with the gondola, the Flégère car park. The sheets do not say whether these have space. Without a car: bus no. 1 to Montroc or the train to Montroc station.

Can you swim or bring a dog at Lac Blanc?

Swimming is banned at Lac Blanc and the Chéserys lakes by prefectoral order. The Col des Montets and Tré-le-Champ sheets do not allow dogs in the Aiguilles Rouges reserve.

What is the elevation of Chamonix and Lac Blanc?

Chamonix village is at 1,035 m (AlpeSnow catalogue). Lac Blanc is at 2,353 m according to the official sheet for the route via La Flégère; the Col des Montets sheet gives 2,350 m for its highest point.

How high is Mont Blanc?

4,805.59 m, from the latest known measurement (2023, Wikipedia). The value changes with every campaign depending on the snow and ice cap: no height is final.

Sources and method

Text of this page last revised on 13 October 2026. This date says nothing about how recent the images or data are: the webcams are supplied by the credited operators and their timestamp shows when the image was taken; model forecasts and official reports are separate pieces of information, each with its own time.