Switzerland — Sion
Ascend through Swiss Alps wilderness on the Arolla to Lac Bleu trail, a moderate 12.5km walk offering stunning panoramas. This 4-5 hour route culminates at the jewel-like Lac Bleu, a turquoise alpine lake set against rugged peaks. Expect varied terrain and breathtaking high-altitude views in the Valais region.
Distance: 12.5 km
Elevation Gain: 750 m
Difficulty: Moderate
Duration: 4-5 hours
The Arolla to Lac Bleu hike is a spectacular day walk nestled in the heart of the Swiss Alps, offering breathtaking views and a rewarding alpine experience. This trail winds its way through rugged mountain terrain, leading to the stunning turquoise waters of Lac Bleu (Blue Lake), a jewel set amidst dramatic peaks. It's a journey that combines challenging ascents with the serene beauty of high-altitude landscapes, making it a must-do for hikers visiting the Valais region of Switzerland.
The Arolla to Lac Bleu hike is a quintessential Swiss alpine adventure, renowned for its dramatic scenery and the captivating beauty of its destination. Starting from the charming mountain village of Arolla, the trail immediately begins its ascent, offering increasingly expansive views of the surrounding peaks and valleys. The path is well-maintained but can be steep in sections, requiring a moderate level of fitness. As you climb, you'll traverse alpine meadows dotted with wildflowers in summer, pass by rugged rock formations, and experience the crisp, clean mountain air.
The highlight of the trek is undoubtedly Lac Bleu. This glacial lake is famous for its intense, almost surreal turquoise colour, a result of fine rock particles suspended in the water that reflect sunlight. The lake is nestled in a cirque, surrounded by imposing mountains, creating a truly picturesque and tranquil setting. It's an ideal spot for a picnic lunch, a moment of quiet reflection, or simply to marvel at the raw beauty of the Alps.
The return journey typically follows a similar path or a slight variation, allowing for different perspectives on the landscape. The entire hike is a testament to the stunning natural beauty of the Swiss Alps, offering a memorable experience for day hikers seeking both challenge and natural wonder. The accessibility from Sion, a major transport hub, makes it a convenient yet profoundly rewarding excursion.
The region around Arolla and Lac Bleu has a rich history deeply intertwined with alpine pastoralism and mountaineering. For centuries, these high pastures have been used for grazing livestock during the summer months, a tradition that has shaped the landscape and the local culture. The village of Arolla itself has a long-standing reputation as a base for climbers and hikers, drawn by its proximity to iconic peaks like the Pigne d'Arolla and the Dent Blanche.
The development of Lac Bleu as a popular hiking destination is more recent, driven by its striking natural beauty. While not steeped in ancient historical events like some European landmarks, its appeal lies in its pristine natural state and the accessibility it offers to a truly wild alpine environment. The trails themselves are often old shepherd paths or routes established for access to mining or early hydroelectric projects, reflecting the human interaction with this rugged terrain over time.
The Valais region, where Arolla is located, has a unique cultural heritage, influenced by its mountainous geography and its position as a crossroads between French and German-speaking Switzerland. The traditions of the alpine villages, including their architecture, cuisine, and festivals, are a significant part of the experience for visitors. The hike to Lac Bleu offers a glimpse into this enduring alpine way of life, where nature's grandeur and human resilience coexist.
The best time to undertake the Arolla to Lac Bleu hike is during the summer months, typically from July to September. During this period, the weather is generally more stable, and the trails are free of snow, making them safe and accessible.
Summer (July to September): This is the prime season. Alpine meadows are in full bloom, creating a vibrant carpet of wildflowers. The days are long, providing ample time for the hike and for enjoying the scenery at Lac Bleu. Temperatures are pleasant, though it's crucial to remember that mountain weather can change rapidly. Expect daytime temperatures to range from 10°C to 20°C, but it can be significantly colder at higher elevations or if the weather turns.
Spring (Late May to June): While some lower sections of the trail might be clear, higher elevations will likely still be covered in snow. This period is generally not recommended for this specific hike unless you have winter hiking experience and appropriate gear. Snowmelt can also make some sections muddy and challenging.
Autumn (October): The early part of October can still offer good hiking conditions, with crisp air and beautiful autumn colours in the lower valleys. However, snow can fall at any time, and temperatures will drop significantly. It's essential to check weather forecasts very carefully if planning an autumn hike.
Weather Considerations: Mountain weather is notoriously unpredictable. Even in summer, afternoon thunderstorms are common. It is vital to start your hike early in the morning to avoid the worst of the heat and the risk of storms. Always check the local weather forecast before setting out and be prepared for a wide range of conditions, including rain, wind, and sudden drops in temperature.
Early Morning (Approx. 8:00 AM): Start in Arolla
Morning (Approx. 9:30 AM - 11:00 AM): Ascending the Mountain
Midday (Approx. 11:30 AM - 1:00 PM): Arrival at Lac Bleu
Afternoon (Approx. 1:00 PM - 3:00 PM): Descent and Return
Late Afternoon (Approx. 3:00 PM - 4:00 PM): Return to Arolla
Important Notes:
The Arolla to Lac Bleu hike is a day walk, meaning no complex booking coordination for accommodation is required. However, essential preparation focuses on logistics, fitness, and understanding the route. The closest major city and transport hub is Sion. From Sion, you can take a PostBus (public bus) directly to Arolla. The bus journey takes approximately one hour and is scenic, winding up into the mountains. If driving, the road from Sion to Arolla is paved but can be narrow and winding, typical of mountain roads in Switzerland. Ample parking is available in Arolla, though a small fee may apply during peak season.
Fitness: This hike involves a significant elevation gain of 750 metres over a relatively short distance. A moderate level of fitness is required. Regular cardiovascular exercise, including hiking or stair climbing, will prepare you well. Ensure you are comfortable walking for 4-5 hours with ascents and descents.
Base Town: Arolla itself is a small mountain village with limited amenities, primarily focused on tourism and mountaineering. For a wider range of accommodation, dining, and shopping options, it is best to base yourself in Sion or a nearby larger town and make Arolla your destination for the day hike. Sion offers hotels, hostels, and restaurants, and is well-connected by train.
This is a day hike requiring no overnight accommodation.
No specific permits are required for hiking to Lac Bleu from Arolla. This is a public hiking trail accessible to all. However, it is important to be aware of local regulations regarding waste disposal and respecting the natural environment.
Parking: While no permit is needed for the hike itself, parking in Arolla may incur a fee. It's advisable to check local signage for current parking charges.
Access: The trail is part of the Swiss hiking network and is maintained by local authorities and hiking associations. Access is generally free and open to the public.
Environmental Respect: While no permits are needed, hikers are expected to adhere to Leave No Trace principles. This includes packing out all rubbish, staying on marked trails, and respecting the natural flora and fauna.
Detailed route notes, maps, logistics & tips for the Arolla Lac Bleu Hike (PDF).
Precisely traced GPX for the Arolla Lac Bleu Hike, ready for your GPS or favourite mapping app.
The Arolla region offers a wealth of activities for outdoor enthusiasts, making it a fantastic destination for a longer stay:
Weather: The most significant safety consideration is the unpredictable mountain weather. Always check the forecast before you leave and be prepared for sudden changes. Afternoon thunderstorms are common in summer and can bring lightning, heavy rain, and strong winds. Start your hike early to minimise the risk.
Terrain: The trail is moderately difficult, with steep ascents and descents over rocky and sometimes loose ground. Wear appropriate footwear with good grip and take your time, especially on the descent, to avoid slips and falls.
Altitude: Lac Bleu is situated at approximately 2,700 metres. While this is not extremely high, some individuals may experience mild symptoms of altitude sickness. Ascend gradually, stay hydrated, and avoid strenuous activity immediately upon arrival if you feel unwell.
Water: Carry sufficient water for the entire hike. While streams are present, it is always best to treat or filter water from natural sources to avoid potential contamination.
Wildlife: You may encounter marmots, chamois, or ibex. While generally not dangerous, maintain a respectful distance and do not attempt to feed them.
Communication: Mobile phone reception can be unreliable in mountainous areas. Inform someone of your hiking plans, including your intended route and expected return time. Consider carrying a personal locator beacon (PLB) for remote areas.
Emergency Services: In case of emergency, contact Swiss Rescue on 144 or the general emergency number 112. Be prepared to provide your exact location.
Lac Bleu itself: The primary point of interest is the lake's extraordinary colour. The intense turquoise hue is a result of fine glacial rock flour suspended in the water, which reflects sunlight. The surrounding amphitheatre of peaks, including the imposing Montagne de Collons, adds to the dramatic setting.
Alpine Flora and Fauna: During the summer months, the alpine meadows are alive with wildflowers. Keep an eye out for species like gentians, edelweiss (though rare), and various alpine roses. Marmots are commonly seen and heard whistling their alarm calls. Chamois and ibex may also be spotted on the higher slopes.
Panoramic Views: The trail offers increasingly spectacular panoramic views as you ascend. From Arolla, you can see the Dent Blanche and the Mont Collon. As you climb higher, the vistas expand to encompass a vast swathe of the Valais Alps, providing excellent photographic opportunities.
Geological Features: The landscape is shaped by glacial activity, evident in the U-shaped valleys, moraines, and the rocky, scree-covered slopes. Understanding the geological forces that created this environment adds another layer of appreciation to the hike.
The Arolla to Lac Bleu trail traverses a pristine alpine environment. Adhering to Leave No Trace principles is crucial to preserve its beauty and ecological integrity for future visitors.
By following these guidelines, you help ensure that the natural beauty of Lac Bleu and its surroundings can be enjoyed by all.
