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Free access · June to October
Lac Blanc
Iconic glacial lake at 2,352 m elevation in the Aiguilles Rouges natural reserve, offering exceptional panoramic views facing Mont-Blanc massif, Aiguille Verte, and Grandes Jorasses.
Ermakae · CC0 · Wikimedia Commons
At a glance
Type
High-altitude glacial lake
Access
Free · No charge
Duration
2 hours' walk from Flégère or 3 hours from Col des Montets
Best season
June to October
Parking
Les Praz de Chamonix car park (Flégère) or Col des Montets car park (Tré-le-Champ)
Dogs
Prohibited (natural reserve)
Stroller
Not suitable
Town
Chamonix-Mont-Blanc
What is Lac Blanc
Lac Blanc is a glacial lake located at 2,352 metres elevation in the Aiguilles Rouges massif, in Chamonix-Mont-Blanc municipality. The lake comprises two bodies of water linked by a small watercourse and sits within the Aiguilles Rouges national nature reserve, a protected area created to preserve alpine fauna and flora. From its shores, Lac Blanc offers exceptional panoramic views of Mont-Blanc massif, Aiguille Verte, Grandes Jorasses, Mer de Glace, and Argentière glacier.
Several hiking routes provide access to the lake. The most common and family-friendly route departs from the Flégère cable car (1,877 m) at Les Praz de Chamonix, followed by approximately 2 hours' walking to reach the lake. Experienced hikers can take the route from Col des Montets or Tré-le-Champ (approximately 3 hours' walking), featuring technical passages and metal ladders. Lac Blanc lies on the Tour du Mont-Blanc (TMB) route, a classic stage for long-distance hikers.
A mountain refuge, Refuge du Lac Blanc, is located immediately next to the lake, offering food and lodging. The current refuge was rebuilt after an avalanche destroyed the original structure in 1986. Below the lake, Lacs des Chéserys offer complementary views and are a popular descent stop. Camping is permitted only at Lacs des Chéserys (between 7 pm and 9 am), not at Lac Blanc itself. Swimming is prohibited in Lac Blanc and Lacs des Chéserys under a prefectural decree of 22 May 2025.
Activities
What you can do here
Practical
Practical information
Address
Aiguilles Rouges Massif, 74400 Chamonix-Mont-Blanc View on map
Coordinates
45.9772° N — 6.8969° E View on map
Elevation
2,352 m
Opening
Accessible for hiking June to October depending on snow cover. Winter closure (snow, difficult conditions). Refuge open June to September.
Admission
Free (lake access). Flégère cable car payable: approximately €26 return adult, €24.70 child 5–14 years (indicative 2026 rates).
Parking
Les Praz de Chamonix car park (Flégère cable car departure) or Tré-le-Champ car park at Col des Montets (hiking departure).
Animals
Dogs prohibited (Aiguilles Rouges national nature reserve).
Accessibility
Not wheelchair accessible. Mountain trail with technical passages (metal ladders), significant elevation gain. Moderately difficult to difficult hiking depending on route.
Access duration
2 hours' walking from Flégère (with cable car) or 3 hours from Col des Montets (full hiking).
Contact
Chamonix High Mountain Office: 04 50 53 22 08 (access conditions, safety). Chamonix Tourist Office: chamonix.com
Regulations
Nature reserve: swimming prohibited (prefectural decree 22 May 2025), camping prohibited at Lac Blanc (permitted at Lacs des Chéserys 7 pm–9 am), foraging prohibited, dogs prohibited, drones prohibited.
Access
How to get there
By car
From Annecy (approximately 1 hour 15 minutes), reach Chamonix via A40 then N205. Two parking options: (1) Les Praz de Chamonix car park (Flégère cable car departure) — follow Les Praz from Chamonix town centre. (2) Tré-le-Champ car park at Col des Montets, heading towards Argentière then Col des Montets on D1506. Arrive early in high season (heavy traffic).
Open in MapsBy bike
Col des Montets greenway accessible by bike from Chamonix or Argentière. Allow approximately 1 hour cycling from Chamonix town centre to Les Praz or Col des Montets, then hiking on foot.
Open in MapsWhen to visit
When to visit
Lac Blanc is accessible June to October depending on snow cover. In June and early July, the upper lake may remain partially iced, creating a distinctive spectacle. July and August see the heaviest traffic (averaging 1,000–1,500 visitors daily), with possible cable car queues. September is often considered the best period: stable conditions, exceptional light, lower crowds, autumn colours. Avoid weekends and public holidays in high season. Starting early (before 8 am) helps avoid crowds and allows wildlife observation in the tranquillity of dawn. In winter, access is restricted to very experienced hikers equipped with snowshoes.
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FAQ
Frequently asked questions
Is access to Lac Blanc chargeable?
Access to Lac Blanc itself is free. However, the Flégère cable car (the most common access option) is payable: approximately €26 return for adults, €24.70 for children 5–14 years (indicative rates). Lac Blanc is also accessible free of charge on foot from Col des Montets.
How do I reach Lac Blanc?
Two main routes: (1) From Les Praz de Chamonix, Flégère cable car to 1,877 m, then 2 hours' walking to Lac Blanc. (2) From Tré-le-Champ car park at Col des Montets, 3 hours' hiking with technical passages (ladders). The Flégère option is more accessible.
What is the best season to visit Lac Blanc?
June to October. September is often preferred: lower crowds, exceptional light, stable conditions. July–August are very busy (up to 1,500 visitors daily). In June, the upper lake may remain partially frozen. Starting early morning allows you to avoid crowds and observe wildlife.
Are dogs allowed at Lac Blanc?
No. Dogs are prohibited at Lac Blanc as it sits within the Aiguilles Rouges national nature reserve. This restriction protects wild fauna (ibex, marmots, chamois) and fragile ecosystems.
Can you swim in Lac Blanc?
No. Swimming is prohibited in Lac Blanc and Lacs des Chéserys under a prefectural decree of 22 May 2025. This measure protects the fragile alpine lake ecosystem and limits visitor impact.
Is Lac Blanc accessible as a family with children?
Yes, for children aged 8–10 and up who are accustomed to mountain hiking. The Flégère route is marked and secure but includes technical passages (metal ladders) and 570 m elevation gain. Bring hiking boots, water, and snacks.
Can you camp at Lac Blanc?
No. Camping is prohibited at Lac Blanc itself. However, it is permitted at Lacs des Chéserys (below) between 7 pm and 9 am only. In high season (notably 14 July), up to one hundred tents may be set up at Chéserys.
Is there a refuge at Lac Blanc?
Yes. Refuge du Lac Blanc, located immediately next to the lake at 2,352 m elevation, offers food and lodging June to September. Cash payment only. The current refuge was rebuilt after the 1986 avalanche that destroyed the original building.
Sources
Sources & verification
Multi-source verification at publication date. Information may change — confirm with the official operator before travelling.
