Lac de Coiselet — loop from Oyonnax

This is a difficult road cycling route, requiring very good fitness. It covers 124 kilometers (77 miles) with a substantial elevation gain of approximately 2,660 meters (8,727 feet). Expect a challenging ride through the Jura region.

The estimated duration for completing this loop is around 6 hours and 50 minutes, though this can vary based on your fitness level and how often you stop to enjoy the scenery.

The route features mostly well-paved surfaces, making it suitable for road bikes. However, be prepared for significant elevation changes, including sustained ascents and descents through what are known as the Ain department's 'calf-pulling passes'.

You'll experience wild yet welcoming landscapes typical of the Jura Mountains, including forests, rivers, and lakes. Key highlights include the central Lac de Coiselet itself, the impressive Valserine Gorges, and charming villages. You might also spot the ruins of a castle overlooking Condes and dinosaur footprints near Coisia.

No, this route is rated as 'difficult' and requires 'very good fitness' due to its length and significant elevation gain. It is not recommended for beginners.

The best time to cycle this route is generally during the warmer months, from late spring to early autumn, when the weather is more stable and the mountain passes are clear of snow. Always check the local weather forecast before you go.

While specific parking details aren't provided, Oyonnax is the starting point, so look for public parking facilities within the town. For public transport, research local bus or train services to Oyonnax, keeping in mind that transporting a road bike might require specific arrangements.

There are no specific permits or entrance fees required to cycle the Lac de Coiselet — loop from Oyonnax. It's a public road cycling route through the region.

This is a road cycling route, and while dogs are generally allowed in public spaces, cycling with a dog on a demanding 124 km route with significant elevation is not typically recommended. If you do bring a dog, ensure it is well-trained, can keep pace, and is on a leash where required, especially in villages or near traffic. Always prioritize your dog's safety and comfort.

The route passes through charming villages, so you can expect to find cafes or restaurants in some of these settlements, particularly around the Lac de Coiselet area. It's always a good idea to carry sufficient water and snacks, especially given the route's length and difficulty.

Yes, sections of this route overlap with other official trails, including parts of the 'Boucle 16 : Tour du lac de Coiselet' and 'Boucle 15 : Tour de la Petite Montagne', as well as segments of the 'Ain à Vélo n°10 : Le balcon du Léman' and the 'GTJ à vélo'.