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Park at the Arpettaz car park at the end of the Route des Confins.
(S/E) From the car park, head south on the main path, which climbs slightly before turning east and descending towards the Lanchette chalet, then climbs north-east. Continue to the Paccaly chalet (terrace, restaurant).
(1) Turn right onto the good path that leaves the road and climbs up the hillside through the pastures. At the Paccaly d'en Haut chalet (altitude 1669 m), leave the path on the right (which climbs up to the Combe de Paccaly) and continue north-east. Further on, join a 4x4 track and follow it to the right for a short distance.
(2) At the next sharp right-hand bend, leave the track and take the path on the left heading north-east. A little further on, after passing some sharp limestone pavements on the right, you will reach the junction with the path that descends to Bombardellaz (which you will take on the way back).
(3) Continue right on the path heading east to skirt around the Aiguilles Noires to the Combe de la Grande Forclaz. The path is poorly marked (red paint marks) but well marked and easy to follow.
You will arrive at the Combe de la Grande Forclaz. Follow the path heading south-east. You will quickly leave the vegetation zone behind and climb up into a completely rocky landscape in this very steep valley.
In early September, there are still several snowfields, all of which can be avoided as the trail stays on the hillside. Finally arrive at the Passage de la Grande Forclaz (altitude 2311).
(4) After enjoying a superb view of Mont Blanc, take the path on the right that climbs up to the ridge. Be careful in this area as you are now on the southern flank of Ambrevetta, a grassy area with many tracks, some of which are close to the precipice.
Stay relatively high on this section and follow a well-marked trail.
Look for red paint marks to confirm you are on the right path.
Continue along the side of the mountain on the path, which climbs steeply in places, until you reach a large slab.
Be very careful on this section, which can be slippery when wet.
The passage over the slab is clearly visible and marked, and leads to the foot of the gully that descends from Ambrevetta.
Exercise caution when climbing this gully, following the red markings and using your hands for support. There are no technical difficulties, but the passage is exposed and can be daunting.
Beware of falling rocks.
(5) When you reach the pass (2463 m), take the well-marked path on the right that passes at the foot of the Ambrevetta to reach the summit of the Tardevant via the ridge. This route offers beautiful views of the valleys on either side.
(6) Retrace your steps back to the previous pass (altitude 2463).
(5) Turn right, choosing a good track among the many that descend into the scree before joining the right path that leads to Lac de Tardevant.
(7) Continue along the path that descends the Combe de Tardevant until you reach the path that climbs up to the Tardevant chalet.
(8) Descend this path until you reach the fork in the path from the outward journey (altitude 1765).
(2) Head north-east along the path you took in the morning and follow it to the Bombardellaz crossroads on the way out.
(3) Leave this path and descend to the left along the path that quickly leads to the Bombardellaz refuge.
(9) After stopping for refreshments at the refuge, take the path heading south, which quickly turns west. Then follow the path heading south-west. You will reach the Paccaly fork on the way there.
(1) Continue straight ahead towards the car park (S/E).
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