Puerto de Ventana and Puerto de San Lorenzo Loop

This loop is classified as challenging to very difficult. Both the Ventana Pass and San Lorenzo Pass feature significant elevation gains and steep gradients, with sections reaching 14-15%. It requires good physical condition and appropriate gearing.

The route offers consistently picturesque scenery. You'll pass through the stunning Somiedo Natural Park and have views of the Ubiñas Natural Park. Key highlights include the challenging ascents of Ventana Pass and San Lorenzo Pass, both renowned for their beauty. You might also encounter the Huerta Cave.

The best time to cycle this loop is generally from late spring to early autumn. During these months, the weather is more stable, and the mountain passes are typically free of snow. Be prepared for varied conditions, as mountain weather can change quickly.

While the exact starting point for a loop can vary, a common access point is from the San Martín side, which is a good base for tackling the climbs. Look for parking options in or around San Martín de Teverga, which provides convenient access to both passes.

No specific permits or entrance fees are required to cycle this route. The loop traverses or offers views of the Somiedo Natural Park and Ubiñas Natural Park, but access to the roads themselves is generally free. Always respect local regulations and natural park guidelines.

While the route is on public roads, it is primarily designed for touring cyclists. If you plan to bring a dog, ensure it is accustomed to cycling alongside you and is kept on a leash, especially given the potential for wildlife and occasional livestock on the roads. Always prioritize your dog's safety and the safety of others.

The route passes through areas rich in biodiversity, particularly within the Somiedo Natural Park. It's common to see horses and cows grazing freely on the roads, especially on the San Lorenzo Pass. Keep an eye out for other local fauna, but always maintain a respectful distance.

Given the remote nature of some sections, especially on the mountain passes, dedicated cafes or rest stops are not frequent. It's advisable to carry sufficient water and snacks. You may find small villages or towns near the base of the passes or along connecting roads where you can refuel.

Yes, sections of this route overlap with several official trails. You will encounter parts of the Transcantábrica, Camín Real de la Mesa, [CIMA AS01] Ventana, and [CIMA AS06] San Lorenzo * La Plaza (Teverga), among others. These intersections can offer opportunities for extending or modifying your ride.

This loop is notable for its inclusion of two iconic mountain passes, Puerto de Ventana and Puerto de San Lorenzo, both frequently featured in the prestigious Vuelta a España. This gives cyclists a chance to ride on routes steeped in professional cycling history, all while enjoying the stunning natural beauty of Asturias' mountain landscapes.

Both passes present significant challenges. The ascent of Puerto de San Lorenzo from the San Martín side has an average gradient of 8.0% over 11.2 km, with sections up to 15%. For Puerto de Ventana, the Asturian side (from San Martín de Teverga) is harder, with a 20.0 km climb at a 5.6% average gradient and an 11% maximum slope. Ensure your bike is equipped with appropriate gearing for sustained climbing, and be prepared for fast descents, especially on San Lorenzo which has fewer hairpin bends.