T2M in Montlignon offers a spring trail-running weekend within the Montmorency forest, located north of Paris. The races utilize a 2,000-hectare forest area featuring steep paths, with routes almost entirely off-road, approximately 99% on trails. Participants can select from various distances, ranging from 10 km events to an ultra of about 80 km, and a children’s race is also part of the program.
The longer routes complete a circuit of the Montmorency massif, crossing wooded slopes, damp valleys, and elevated points offering views towards Paris. The 20 km event counts as a UTMB Index race, covering roughly 23.6 km with 920 meters of elevation gain. The By Night race takes participants into the forest after dark over approximately 14 km, featuring one aid station and a four-hour time limit. The event also provides support to the Mutuelle la Mayotte center in Montlignon, an organization assisting children with disabilities.