Tackle the legendary slopes of the Vosges Mountains at Les Courses du Grand Ballon on Sunday, May 10, 2026. This classic mountain running festival, organized by the Union Sportive Thann Athlétisme, offers three epic challenges all starting from the village of Willer-sur-Thur, each culminating at or near the summit of the Grand Ballon, the highest peak in the Vosges. Choose the pure ascent of "La Montée" (14.2 km, 1220m D+), a demanding mountain race that is part of the prestigious Trophée des Vosges, the scenic loop of "Le Défi" (25 km, 1320m D+), a true trail adventure, or the accessible "Mini-Trail de l'Ostein" (9 km, 350m D+), a perfect introduction to trail running with stunning valley views. The event is renowned for its fantastic organization, including free shuttle buses that solve the classic point-to-point logistics, allowing runners to descend comfortably from the summit after their monumental effort. With its mix of serious competition in "La Montée" and inclusive trail options, it attracts a wide range of athletes, all united by the challenge of conquering this iconic peak. The finish line on the high alpine pastures, with panoramic views stretching across the Rhine valley, provides an unforgettable reward and a profound sense of achievement. For any mountain runner or trail enthusiast, this event is a must-do pilgrimage to the roof of the Vosges.
Races Offered
Trail 25 km
May 10, 2026
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Distance —
25K
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08:30
14.2 km
May 10, 2026
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Distance —
14.2K
terrain
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10:00
Trail 9 km
May 10, 2026
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Distance —
9K
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84 days remaining
Weather Overview
These values represent the 3-year monthly averages for May in Willer-sur-Thur.
Temp (°C)
Feels Like (°C)
thermostat10.4° / 19.3°
wb_sunny8.5° / 17.3°
Wind (km/h)
Humidity (%)
air8.7 /
water_drop70.9%
Temp (°C)
Feels Like (°C)
Wind (km/h)
Humidity (%)
thermostat10.4° / 19.3°
wb_sunny8.5° / 17.3°
air8.7 km/h
water_drop70.9%
About Willer-sur-Thur
Willer-sur-Thur is a commune in the Haut-Rhin department in Grand Est in north-eastern France.
