Col de Porte and Fort du Saint-Eynard Loop from Grenoble

This is a difficult road cycling route, demanding very good fitness. It features significant climbing, including the ascent to Col de Porte (1326 m), which is about 15 km long with an average gradient of 7.2% and sections up to 14.9%. The climb to Fort of Saint-Eynard is also very steep, with a 3 km section averaging 10%.

The route is approximately 51 km long with over 1600 meters of elevation gain. It typically takes around 3 hours and 30 minutes to complete, but this can vary significantly based on your fitness level and how often you stop to enjoy the views.

You'll encounter several notable points. The Quaix-en-Chartreuse Hairpins offer a classic cycling experience. You'll pass through Quaix-en-Chartreuse and over Palaquit Pass before reaching Col de Porte (1326 m). The most spectacular views are from the Fort of Saint-Eynard, offering panoramic vistas over Grenoble, the Grésivaudan valley, and the surrounding Alpine ranges, including the Belledonne and sometimes even Mont Blanc.

The best time to cycle this route is typically from late spring through early autumn. During these months, the weather is generally favorable, and the roads are clear. The climb to the fort is shaded by forest, which can be pleasant in hot weather.

Yes, cycling this route in winter requires caution. The road to the Fort of Saint-Eynard may not be cleared of snow and can have icy passages late into the season. Always check local road conditions before attempting the loop in colder months.

As the route starts and ends in Grenoble, you can find various parking options within the city. For public transport, Grenoble is well-served by buses and trams, making it easy to reach a convenient starting point for your ride. Specific parking lots or public transport stops near the route's initial section would depend on your exact starting preference within Grenoble.

This route is a challenging road cycling loop designed for experienced cyclists due to its significant climbs and technical descents. It is generally not recommended for families with young children or for bringing dogs, as the focus is on demanding road cycling rather than leisurely family outings or dog-friendly activities.

No, you do not need any specific permits or have to pay entrance fees to cycle this route. The roads are publicly accessible.

Yes, as this route passes through the Parc naturel régional de la Chartreuse, it's important to respect the park's regulations. This generally includes staying on marked roads, not disturbing wildlife, and practicing leave-no-trace principles. There are no specific cycling permits required for public roads within the park, but always be mindful of local signage and environmental protection guidelines.

Yes, the route intersects with several other paths. Notably, it covers significant sections of the P'tites Routes du Soleil, étape 8, Saint-Pierre-d'Entremont / Grenoble, Chemins du Soleil, and La Belle Via. You'll also find smaller segments overlapping with the Voie Verte de la digue de l'Isère en amont de Grenoble and the Traversée de la Chartreuse.

Grenoble, being a major city, offers numerous options for cafes, restaurants, and accommodation before or after your ride. Along the route, particularly in smaller settlements like Quaix-en-Chartreuse or near Col de Porte, you might find smaller establishments to refuel. It's always a good idea to carry sufficient water and snacks, especially on the climbing sections.