Isollaz - Col Dondeuil

The trail to Col Dondeuil is one of the most physically demanding hiking routes in the Challand-Saint-Victor area. Beginning at Isollaz, just 700 m above sea level — one of the lowest starting points in the Aosta Valley trail network — it climbs 1662 metres over nine kilometres to reach the col at 2342 m, an exceptional elevation gain for an E-grade route. The path crosses every typical Alpine environment in succession: valley-floor vineyards and chestnut groves, mixed oak and ash woodland, larch forest, open high pastures, and finally the rocky scree of the upper col. This ecological diversity makes the route outstanding for nature lovers. An early start is strongly recommended given the length and altitude gain.