Environmental action plan 2025

Protecting the mountain starts before the starting line.

In 2023, the environmental impact analysis confirms a key figure: 96% of the Mont Blanc Marathon's carbon footprint comes from the transport of runners and their companions.

Every year, almost 10,000 runners travel to Chamonix for the adventure. To preserve this playground, we have redesigned the registration system toencourage the use of public transport.

In 2025, two major measures to reduce impact:
- 40% of race numbers reserved for participants coming by train or bus
- Mandatory carbon offsetting for all, regardless of the mode of transport selected

Results?
- 77.6% of participants used low-carbon means of transport to get to the 2025 edition
- 48% of participants came by train or bus vs. 25% in 2024
- 16% of participants came by thermal car vs. 36% in 2024
- €42,000 raised (€6,000 in 2024) for carbon offsetting and donated to the Association Française d'Agroforesterie (AFA).

Thank you for your commitment, and let's keep moving forward together.

What about 2026?
We're continuing the actions we've taken to limit the impact of the event and reinforce our approach.
More information to follow in the next few days...