Plizio Visual Lab

Lac de Joux

Plizio editorial teamUpdated: Jun 2026Data Sources

Lake

Weather…

Lac de Joux is situated at an elevation of 1,004 meters in the Jura Mountains, making it the largest lake in Switzerland located above 1,000 meters. Stretching approximately nine kilometers in length, it is framed by the dense Risoud Forest and the prominent Dent de Vaulion peak. A unique geological feature of the lake is its subterranean drainage; water seeps through the porous limestone floor and resurfaces several kilometers away in the Caves of Vallorbe. Due to the harsh microclimate of the Vallée de Joux, the lake often freezes entirely in winter, transforming into Europe's largest natural ice rink. In the summer months, it is a hub for windsurfers, sailors, and hikers who appreciate its pristine environment. The surrounding region is globally renowned for its high-end watchmaking industry, with many prestigious manufacturers located in the lakeside villages. Nature reserves along the shores protect rare flora and bird species. The reflection of the evergreen forests in the clear water gives Lac de Joux a distinctively Nordic feel.

Location: Switzerland
Top sights: Mont Tendre · Temple du Lieu · Temple des Bioux
Nearby: Pompaples (17 km)

Best time to visit & climate

The most pleasant time to visit is Jun–Aug.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg °C	-1	0	4	9	12	17	19	18	14	10	4	0
Rain mm	96	75	92	82	117	107	101	107	80	103	100	109

📋 Practical info

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Getting there

Reachable by regional train (S2) from Vallorbe or Le Brassus. Roads lead over the Col du Marchairuz or Col du Mollendruz mountain passes into the high-lying Joux Valley.

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Best season

Summer is good for windsurfing and swimming in the refreshing lake. In winter, the lake often freezes over completely, becoming a massive natural ice skating rink (always check safety warnings).

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Terrain & paths

Located in a high valley at 1004m, the surrounding terrain is a mix of flat shorelines and forested Jura hills. Most paths are well-maintained and excellent for relaxed walks or cycling trips.

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What to bring

Bring wind-resistant clothing as the Joux Valley is known for its steady breezes. If visiting in winter, warm layers and ice skates are essential items for enjoying the frozen lake surface.

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Parking

Ample public parking is found in the villages of Le Sentier, L'Abbaye, and Le Pont. Several spots along the shore also offer direct access and parking for visitors arriving by car.

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Safety

In winter, never step onto the ice unless it has been officially declared safe and open by local authorities. Watch for sudden weather changes, which can occur frequently in this high mountain valley.

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Time needed

A visit can range from a 2-hour walk near Le Pont to a full day of hiking and water sports. The lake is great for a relaxed and rejuvenating day trip in a scenic mountain setting.