Via Calda

You start in El Pont du Suert, a really small village in the Ribagorza region. It’s the southern gateway to the Pyrenees. The trail heads north, following the Noguera de Tor river. You steadily climb towards the Boí Valley. Along the way, the scenery changes from pine forests to wider landscapes and traditional villages. Before reaching Boí after 19 km, you pass several small settlements. Boí is known for its UNESCO-listed Romanesque church Sant Joan de Boí. This cultural vibe of this stage shows a lot of history.

The second stage is the shortest of all, a big contrast with the kilometres of the other days. The path continues further into the valley, surrounded by the peaks of the Aigüestortes National Park. The route climbs gently through forests before reaching Caldes de Boí, famous for its thermal springs and historic spa complex. Here, you find one of the highest concentrations of mineral-rich hot springs in Europe. For centuries, the waters have been used for their healing properties. This stage shows the wellness traditions of the Pyrenees.

Stage number three crosses the heart of the Pyrenees. The trail climbs gradually through Aigüestortes i Estany de Sant Maurici National Park, a beautiful area known for its mountain peaks and glacial lakes. This stage is the most scenic one of the Via Calda, with true high-mountain vibes. For example, you can take a break at Refugi Ventosa where you can enjoy the best views of the peaking mountains and lake. Also, at this stage you reach the highest point of the trail (2.550m). After this, you descend into the Aran Valley and hike along small rivers. After a long day you finish at Bahns de Tredòs (or you skip the last hour of hiking and use the taxi service 30 minutes from Refugi de Colomèrs).

If you’re looking for an even more challenging adventure in this same park, consider the Carros de Foc, a multi-day hut-to-hut trek that connects several mountain refuges. It’s a much tougher route than the Via Calda, but it rewards you with the true beauty of this national park.

The fourth stage is 20 km but easy. Leaving Bahns de Tredòs, the path descends steadily along the valley of the Garona river, surrounded by forests. This stage has a more pastoral atmosphere compared to the previous one, with villages, farmhouses and cultural landmarks. You end this day in Vielha, the main town of the Aran Valley. It’s a cultural hub of the region where you can find multiple restaurants, hotels and shops.

The final stretch follows the Garona river downstream, tracing old paths that historically connected villages in the Aran Valley. Unlike the more rugged earlier stages, this stretch has a more accessible profile, with gentle terrain through forests, riversides and meadows. The distance is still long, but the overall gradient is easier. Eventually, after around 20 km you finish at Bossòst, a small village near the French border. Bossòst is known for its Romanesque church of Era Assumpcion de Maria. You don’t have many options for accommodations, so you must book on time.

The best time of the year to hike the Via Calda is from June to (early) September. As you’re hiking in the mountains, be aware that there might be snowfields in early summer and there might be early snowfalls in late summer and early autumn.

Keep in mind that the weather in the high mountains can change rapidly, and it’s important to be prepared for all conditions, including rain or snow. Always check trail conditions and local weather forecasts before starting a high-alpine hike.

It’s necessary to prepare yourself properly. You have to be experienced in hiking long distances and you need a good fitness level.

A lightweight backpack (30 – 40 liters) is ideal for carrying all your supplies, including snacks, water and extra clothing. There will be enough water resources during the trail, but it’s recommended to bring enough water with you (at least 2 liters). Because of the distances and possible temperature changes.

Essential gear includes sturdy hiking boots with good grip, a detailed map or GPS device and weather-appropriate clothing.

Check the weather forecast daily. Bring a waterproof jacket and layers for different temperatures. Hiking poles can help with balance on steep or uneven terrain.

This trail is easy. One day is in Aigüestortes National Park with some elevation, mountain paths and rocky sections. It’s not a high-altitude trail, so without steep ascents or exposed ridges. Four out of five days you’ll walk in forests or easy (asphalt) paths with little elevation.