The planned inclusion of the Col de la Sarenne in the Tour de France has sparked an intense ecological debate across the Alps, highlighting a growing tension between major sporting spectacles and mountain conservation.
An Alpine Clash Over the Tour de France
According to local reporting from Isère, the fragile natural site is scheduled to feature twice during the race calendar: first on July 19 for an amateur cycling event drawing an estimated 16 000 cyclistes, and again on July 25 for the professional peloton during the 20th stage of the Grande Boucle.
Fragile Ecosystems in the Crosshairs
Environmental advocates and local wildlife defenders have raised urgent concerns over the impact of thousands of visitors and support vehicles moving through the protected alpine corridor.
Located near a regional natural park, the 12.9-kilometer climb is typically a quiet, narrow mountain route characterized by delicate ecosystems and diverse fauna, including marmots, chamois, foxes, stoats, and golden eagles.
A Petition Gains Momentum Before November 2025
Public pushback has intensified in the months leading up to the race.
According to cycling and environmental reports from Secuvelo, a petition opposing the inclusion of the climb had gathered près de 6 000 signatures by late November 2025. Organizers of the petition point specifically to the timing of the event, noting that July coincides with the hatching season of the golden eagles that nest in the rocky cliffs above the pass.
Helicopters and Crowds Threaten Summer Feeding Grounds
Beyond the crush of spectators lining the narrow switchbacks, critics have highlighted the potential disruption caused by low-flying broadcast helicopters filming the race.
Wildlife advocates warn that the combination of aerial noise and ground crowds threatens to drive animals from their summer feeding grounds during a crucial seasonal window.
Precedent and Unanswered Questions for ASO
The route is not entirely unfamiliar to race organizers. The Col de la Sarenne was previously tackled during the 2013 Tour de France in a loop connected to Alpe d’Huez, though the contemporary debate reflects heightened sensitivity surrounding ecological preservation in high-altitude environments.
To mitigate similar pressures, grand tours have occasionally implemented operational restrictions in sensitive terrain. During the 2025 Vuelta a España, race officials limited team support vehicles to motorcycles on select delicate mountain ascents to reduce traffic congestion and environmental disturbance. Whether Amaury Sport Organisation (ASO) will adopt comparable restrictions for the Sarenne stages remains unconfirmed.
As planning for the 2026 route continues, race officials face the ongoing challenge of balancing the fierce athletic demands of a double ascent of Alpe d’Huez—with one leg traversing the rugged Sarenne pass—against mounting calls to safeguard alpine biodiversity.
